Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a291220
Lucía A. González-López, M. Colín-García, A. Meléndez-López, J. Cruz-Castañeda, A. Negrón-Mendoza
Hydrothermal systems have been proposed as keen environments on the early Earth where chemical evolution processes could have occurred. The presence of minerals and a continuous energy flux stand out among the most remarkable conditions in such environments. In this research the decomposition of two organic acids was studied. Ionizing radiation and thermal energy were the sources selected for decomposition tests, as both are naturally present on hydrothermal systems and probably, they were present on early Earth. Radiation could come from unstable elements in minerals, and heat is the most abundant energy source in hydrothermal systems. As minerals play a key role in prebiotic chemistry experiments and are an essential component on hydrothermal environments, the role of olivine in decomposition was tested. Results indicate that both organic acids highly decomposed when irradiated or heated. Radiation is more efficient than heating in decomposing the carboxylic acids and forming other carboxylic acids. Interestingly, the occurrence of olivine affects decomposition on both heated and irradiated samples, as both the rate of decomposition, and the amount and type of products vary compared with experiments without the mineral. The formation of other carboxylic acids was followed in all samples. Succinic, tricarballilic, citric and carboxisuccinic acids were detected in radiolysis experiments of acetic acid. The radiolysis of formic acid produced oxalic and tartronic. The heating of acetic acid solutions formed succinic, tricarballilic, citric and carboxisuccinic acids. However, the heating of formic acids only generated oxalic acid. The presence of olivine affected the amount and type of carboxylic acids formed in radiation and heating experiments. Natural hydrothermal systems are complex environments and many variables are present in them. Our results reinforce the idea that a combination of variables is necessary to better simulate these environments in prebiotic chemistry experiments. All variables could have affected the prebiotic chemical reactions; and hence, the role of hydrothermal systems in prebiotic chemistry could be much more complex that thought.
{"title":"Prebiotic experiments simulating hydrothermal vents: Influence of olivine in the decomposition of simple carboxylic acids","authors":"Lucía A. González-López, M. Colín-García, A. Meléndez-López, J. Cruz-Castañeda, A. Negrón-Mendoza","doi":"10.18268/bsgm2021v73n3a291220","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a291220","url":null,"abstract":"Hydrothermal systems have been proposed as keen environments on the early Earth where chemical evolution processes could have occurred. The presence of minerals and a continuous energy flux stand out among the most remarkable conditions in such environments. In this research the decomposition of two organic acids was studied. Ionizing radiation and thermal energy were the sources selected for decomposition tests, as both are naturally present on hydrothermal systems and probably, they were present on early Earth. Radiation could come from unstable elements in minerals, and heat is the most abundant energy source in hydrothermal systems. As minerals play a key role in prebiotic chemistry experiments and are an essential component on hydrothermal environments, the role of olivine in decomposition was tested. Results indicate that both organic acids highly decomposed when irradiated or heated. Radiation is more efficient than heating in decomposing the carboxylic acids and forming other carboxylic acids. Interestingly, the occurrence of olivine affects decomposition on both heated and irradiated samples, as both the rate of decomposition, and the amount and type of products vary compared with experiments without the mineral. The formation of other carboxylic acids was followed in all samples. Succinic, tricarballilic, citric and carboxisuccinic acids were detected in radiolysis experiments of acetic acid. The radiolysis of formic acid produced oxalic and tartronic. The heating of acetic acid solutions formed succinic, tricarballilic, citric and carboxisuccinic acids. However, the heating of formic acids only generated oxalic acid. The presence of olivine affected the amount and type of carboxylic acids formed in radiation and heating experiments. Natural hydrothermal systems are complex environments and many variables are present in them. Our results reinforce the idea that a combination of variables is necessary to better simulate these environments in prebiotic chemistry experiments. All variables could have affected the prebiotic chemical reactions; and hence, the role of hydrothermal systems in prebiotic chemistry could be much more complex that thought.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44178625","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a020121
H. Karasawa, Manabu Kano
Goniodromites sp. (Brachyura: Dromiacea: Goniodromitidae) is described from the Cenomanian (Upper Cretaceous) cold seep sediment in the Middle Yezo Group of Hokkaido, Japan. This species is the first recognition of the genus and family from the Cretaceous chemosynthetic communities, and represents the second record of a decapod from the fossil chemosynthetic communities in Japan. In addition, Sabellidromites inflata (Collins and Karasawa, 1993), a poorly known goniodromitid crab is redescribed.
Goniodromites sp.(腕足目:Dromiacea: Goniodromitidae)是在日本北海道中野三群Cenomanian(上白垩统)冷渗沉积物中发现的。这是白垩纪化学合成群落中首次发现的属和科，也是日本化石化学合成群落中第二次记录到的十足类动物。此外，还重新描述了一种不太为人所知的产卵蟹——Sabellidromites inflata (Collins and Karasawa, 1993)。
{"title":"A first notice of the goniodromitid crab from the Cenomanian (Upper Cretaceous) cold seep deposit of Hokkaido, Japan, with the redescription of Sabellidromites inflata (Collins and Karasawa, 1993) (Decapoda: Goniodromitidae)","authors":"H. Karasawa, Manabu Kano","doi":"10.18268/bsgm2021v73n3a020121","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a020121","url":null,"abstract":"Goniodromites sp. (Brachyura: Dromiacea: Goniodromitidae) is described from the Cenomanian (Upper Cretaceous) cold seep sediment in the Middle Yezo Group of Hokkaido, Japan. This species is the first recognition of the genus and family from the Cretaceous chemosynthetic communities, and represents the second record of a decapod from the fossil chemosynthetic communities in Japan. In addition, Sabellidromites inflata (Collins and Karasawa, 1993), a poorly known goniodromitid crab is redescribed.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45696878","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a030321
J. Jagt, E. Jagt-Yazykova, B. V. van Bakel, René H. B. Fraaije
Both partially articulated specimens and dissociated marginal ossicles form the basis for erection of two new species of Late Cretaceous goniasterids from the Mons and Liège-Limburg basins (Belgium) and the Hannover area (Germany). Chomataster breizh sp. nov., which recalls the type species, Chomataster acules Spencer, 1913, but differs in several respects, is based on a partial external mould of the marginal frame of disc and arms in flint (upper Campanian Spiennes Chalk Formation; Mons Basin), as well as on a more or less complete individual, preserving small, spherical spines and granules and encased in a flint nodule from the upper Maastrichtian Nekum Member (Maastricht Formation; Liège-Limburg Basin). In Ch. breizh sp. nov., supero- and inferomarginals bear close-set granule pits, of varying sizes, as well as bivalved alveolar scars of pedicellariae; median superomarginals and all inferomarginals lack large, crater-shaped spine pits – such are found only in the disc/arm transition and along the arms. Dissociated supero- and inferomarginal ossicles from the lower and upper Campanian of the Hannover area and the upper Campanian of northeast Belgium, previously recorded either as indeterminate astropectinids or as Nymphaster obtusus (Forbes, 1848) var. nov. and as Nymphaster sp., respectively, here are assigned to Nymphaster mudzborgh sp. nov. This species is characterised by a row of 3–5 large spine pits on the aboral and lateral surfaces of superomarginals; inferomarginals have an angular profile and a close cover of granule pits. Nymphaster tethysiensis Villier, 2001, from the upper Campanian of Landes (southwest France; Villier and Odin, 2001) appears best accommodated in Chomataster as well, because in the arm superomarginals alternate rather than meet over the mid-radial line.
部分铰接标本和分离的边缘小骨构成了在蒙斯和利埃格-林堡盆地（比利时）以及汉诺威地区（德国）建立两种新的晚白垩世角星的基础。Chomataster breizh sp.nov.，它让人想起了模式物种Chomataster-acules-Spencer，1913，但在几个方面有所不同，它是基于燧石中圆盘和臂的边缘框架的部分外部模具（上坎帕尼亚-斯皮因斯白垩岩组；蒙斯盆地），以及一个或多或少完整的个体，球形棘和颗粒，包裹在上马斯特里赫特阶Nekum段的燧石结核中（马斯特里赫特组；李-林堡盆地）。在Ch.breizh sp.nov.中，上缘和下缘有大小不一的紧密排列的颗粒坑，以及足趾的双壳肺泡疤痕；中上缘和所有下缘都没有大的、火山口状的脊坑——只有在椎间盘/臂的过渡处和沿臂发现这种脊坑。来自汉诺威地区坎潘阶下半部和上半部以及比利时东北部坎潘阶上半部的分离的上缘和下缘小骨，以前分别被记录为不确定的类星形小骨或钝睡莲（Forbes，1848）var.nov.和睡莲属。该物种的特征是在超边缘的人工流产和侧面上有一排3-5个大的棘坑；下边缘具有棱角分明的轮廓和颗粒凹坑的紧密覆盖。tethysiensis Nymphaster Villier，2001年，来自朗德斯上坎潘阶（法国西南部；Villier和Odin，2001年），似乎也最适合在Chomataster，因为在手臂中，超边缘交替而不是在径向中线上相遇。
{"title":"Notes on some Late Cretaceous goniasterid starfish (Echinodermata, Asteroidea) from Belgium and Germany","authors":"J. Jagt, E. Jagt-Yazykova, B. V. van Bakel, René H. B. Fraaije","doi":"10.18268/bsgm2021v73n3a030321","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a030321","url":null,"abstract":"Both partially articulated specimens and dissociated marginal ossicles form the basis for erection of two new species of Late Cretaceous goniasterids from the Mons and Liège-Limburg basins (Belgium) and the Hannover area (Germany). Chomataster breizh sp. nov., which recalls the type species, Chomataster acules Spencer, 1913, but differs in several respects, is based on a partial external mould of the marginal frame of disc and arms in flint (upper Campanian Spiennes Chalk Formation; Mons Basin), as well as on a more or less complete individual, preserving small, spherical spines and granules and encased in a flint nodule from the upper Maastrichtian Nekum Member (Maastricht Formation; Liège-Limburg Basin). In Ch. breizh sp. nov., supero- and inferomarginals bear close-set granule pits, of varying sizes, as well as bivalved alveolar scars of pedicellariae; median superomarginals and all inferomarginals lack large, crater-shaped spine pits – such are found only in the disc/arm transition and along the arms. Dissociated supero- and inferomarginal ossicles from the lower and upper Campanian of the Hannover area and the upper Campanian of northeast Belgium, previously recorded either as indeterminate astropectinids or as Nymphaster obtusus (Forbes, 1848) var. nov. and as Nymphaster sp., respectively, here are assigned to Nymphaster mudzborgh sp. nov. This species is characterised by a row of 3–5 large spine pits on the aboral and lateral surfaces of superomarginals; inferomarginals have an angular profile and a close cover of granule pits. Nymphaster tethysiensis Villier, 2001, from the upper Campanian of Landes (southwest France; Villier and Odin, 2001) appears best accommodated in Chomataster as well, because in the arm superomarginals alternate rather than meet over the mid-radial line.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47523683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a170521
Gerardo Rivas, F. J. Vega
Se describe Palaeodiplothrombidium microscutum gen, et sp. nov. a partir de un adulto y una deutoninfa preservados en ámbar del Mioceno inferior de Chiapas, México. Este taxón nuevo de ácaro es el primer registro de la Cohorte Parasitengona (Acari: Trombidiformes: Prostigmata) para un yacimiento de ámbar dentro de México y también el primer registro fósil de la familia Johnstonianidae a nivel mundial.
{"title":"Primer registro fósil de Parasitengona (Acari: Prostigmata) del ámbar mexicano, con una descripción de un nuevo género y especie para la familia Johnstonianidae Thor, 1935","authors":"Gerardo Rivas, F. J. Vega","doi":"10.18268/bsgm2021v73n3a170521","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a170521","url":null,"abstract":"Se describe Palaeodiplothrombidium microscutum gen, et sp. nov. a partir de un adulto y una deutoninfa preservados en ámbar del Mioceno inferior de Chiapas, México. Este taxón nuevo de ácaro es el primer registro de la Cohorte Parasitengona (Acari: Trombidiformes: Prostigmata) para un yacimiento de ámbar dentro de México y también el primer registro fósil de la familia Johnstonianidae a nivel mundial.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42005212","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a160321
J. Perelló
The sediment-hosted stratiform copper–silver mineralization in the San Marcos area of Coahuila, northeastern Mexico occurs predominantly at an Early Cretaceous redox boundary between footwall siliciclastic red beds of the San Marcos Formation and hanging-wall carbonate strata of the Cupido Formation in the Sabinas basin. The hypogene mineralization is mainly present as chalcocite-group minerals, with additional bornite and chalcopyrite, and everywhere occurs in both disseminated and vein/veinlet forms. Supergene copper-bearing oxides (malachite, chalcanthite, azurite, chrysocolla) are, however, the dominant surface expression of the mineralization. Additional sediment-hosted stratiform copper–silver mineralization also occurs, albeit erratically, in lower strata of the Sabinas basin as well as in veins in basement granitoids, thus spanning ~3000 m of basin stratigraphy. Where best developed, the stratiform mineralization displays intense structural control proximal to the regional San Marcos fault system. This major bounding fault, regional in nature and with numerous periods of activity, controlled the evolution of the Sabinas basin. Structural controls on mineralization include stacked, shallow-angle, bedding-parallel, northeast-vergent thrust faults and associated drag folds, in addition to numerous, steeply-dipping, northeast-trending copper-bearing veins and veinlets. The mineralized veins and veinlets, and the bedding-parallel thrusts display mutually crosscutting relationships. These elements are all consistent and in harmony with a regional northeast-trending direction of horizontal shortening accompanying reverse motion of the San Marcos fault system. Inversion along the San Marcos fault system, and the entire Sabinas basin in the Paleogene from ~60 to 40 Ma, resulted from wholesale contractional deformation during the Laramide (Mexican) orogeny. Hence, emplacement of the sediment-hosted stratiform copper–silver mineralization at San Marcos, and elsewhere in the larger Coahuila region, is interpreted as a natural corollary of large-scale, metal-bearing fluid expulsion, migration, and precipitation resulting from orogenic shortening, lithostatic loading, and squeezing of the Sabinas basin during Mexican orogen construction. Although sedimentation of the host strata in the Sabinas basin took place in a pericratonic setting associated with the opening of the Gulf of Mexico, sediment-hosted stratiform copper-silver mineralization occurred during orogenic uplift and conversion of the original basin into an orogen-foreland pair, with similarities to some of the world´s largest sediment-hosted stratiform copper provinces.
{"title":"Geologic observations in the San Marcos area, Coahuila, Mexico: the case for sediment-hosted stratiform copper–silver mineralization in the Sabinas basin during the Laramide orogeny","authors":"J. Perelló","doi":"10.18268/bsgm2021v73n3a160321","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a160321","url":null,"abstract":"The sediment-hosted stratiform copper–silver mineralization in the San Marcos area of Coahuila, northeastern Mexico occurs predominantly at an Early Cretaceous redox boundary between footwall siliciclastic red beds of the San Marcos Formation and hanging-wall carbonate strata of the Cupido Formation in the Sabinas basin. The hypogene mineralization is mainly present as chalcocite-group minerals, with additional bornite and chalcopyrite, and everywhere occurs in both disseminated and vein/veinlet forms. Supergene copper-bearing oxides (malachite, chalcanthite, azurite, chrysocolla) are, however, the dominant surface expression of the mineralization. Additional sediment-hosted stratiform copper–silver mineralization also occurs, albeit erratically, in lower strata of the Sabinas basin as well as in veins in basement granitoids, thus spanning ~3000 m of basin stratigraphy. Where best developed, the stratiform mineralization displays intense structural control proximal to the regional San Marcos fault system. This major bounding fault, regional in nature and with numerous periods of activity, controlled the evolution of the Sabinas basin. Structural controls on mineralization include stacked, shallow-angle, bedding-parallel, northeast-vergent thrust faults and associated drag folds, in addition to numerous, steeply-dipping, northeast-trending copper-bearing veins and veinlets. The mineralized veins and veinlets, and the bedding-parallel thrusts display mutually crosscutting relationships. These elements are all consistent and in harmony with a regional northeast-trending direction of horizontal shortening accompanying reverse motion of the San Marcos fault system. Inversion along the San Marcos fault system, and the entire Sabinas basin in the Paleogene from ~60 to 40 Ma, resulted from wholesale contractional deformation during the Laramide (Mexican) orogeny. Hence, emplacement of the sediment-hosted stratiform copper–silver mineralization at San Marcos, and elsewhere in the larger Coahuila region, is interpreted as a natural corollary of large-scale, metal-bearing fluid expulsion, migration, and precipitation resulting from orogenic shortening, lithostatic loading, and squeezing of the Sabinas basin during Mexican orogen construction. Although sedimentation of the host strata in the Sabinas basin took place in a pericratonic setting associated with the opening of the Gulf of Mexico, sediment-hosted stratiform copper-silver mineralization occurred during orogenic uplift and conversion of the original basin into an orogen-foreland pair, with similarities to some of the world´s largest sediment-hosted stratiform copper provinces.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42815748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a170121
Paulina Cifuentes-Ruiz, H. Brailovsky, María de Lourdes Serrano-Sánchez, F. Vega
A new genus and species of Hypselosomatinae (Heteroptera: Dipsocoromorpha), Hypsotsijilia bretoni Cifuentes-Ruiz and Brailovsky gen. nov., sp. nov. is herein described based on a female specimen. It represents the first fossil record of Schizopteridae in the early Miocene amber from Chiapas, Mexico. It is compared with related taxa and the estuarine paleoenvironment is discussed, matching the one previously cited for the subfamily in other estuarine amber deposits.
{"title":"First fossil Schizopteridae (Hemiptera: Heteroptera) in Miocene amber from Chiapas, Mexico","authors":"Paulina Cifuentes-Ruiz, H. Brailovsky, María de Lourdes Serrano-Sánchez, F. Vega","doi":"10.18268/bsgm2021v73n3a170121","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a170121","url":null,"abstract":"A new genus and species of Hypselosomatinae (Heteroptera: Dipsocoromorpha), Hypsotsijilia bretoni Cifuentes-Ruiz and Brailovsky gen. nov., sp. nov. is herein described based on a female specimen. It represents the first fossil record of Schizopteridae in the early Miocene amber from Chiapas, Mexico. It is compared with related taxa and the estuarine paleoenvironment is discussed, matching the one previously cited for the subfamily in other estuarine amber deposits.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48008222","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a120221
A. De Angeli, A. Garassino
The rich decapod assemblage from the late Eocene of San Feliciano hill (Orgiano, Monti Berici, Vicenza, NE Italy) was partially recorded by De Angeli and Garassino (2002, 2014). Herein, two new crabs, Bericirinia bretoni n. gen., n. sp. (Epialtidae MacLeay, 1838) and Orgianocarcinus bericus n. gen., n. sp. (Dairidae Ng and Rodriguez, 1986) are reported from San Feliciano Hill, located in Monti Berici, Orgiano. Moreover, two well-preserved specimens assigned to Actaeites lobatus Müller and Collins, 1991 (Xanthoidea MacLeay, 1838, incertae sedis) allowed to add some morphological characters to the original description of the holotype, lacking the fronto-orbital margin.
De Angeli和Garassino(2002,2014)部分记录了意大利东北部维琴察的San Feliciano山(Orgiano, Monti Berici, Vicenza, NE Italy)晚始新世丰富的十足类组合。本文报道了两种新蟹，Bericirinia bretoni n. gen.， n. sp. (Epialtidae MacLeay, 1838)和Orgianocarcinus bericus n. gen.， n. sp. (Dairidae Ng and Rodriguez, 1986)。此外，两个保存完好的标本归属于lobatus Actaeites m ller和Collins, 1991 (Xanthoidea MacLeay, 1838, incertae sedis)，可以在原始的全型描述中添加一些形态学特征，缺少额眶边缘。
{"title":"New report of fossil crabs (Decapoda, Brachyura) from the late Eocene of San Feliciano Hill (Orgiano, Monti Berici, Vicenza, NE Italy)","authors":"A. De Angeli, A. Garassino","doi":"10.18268/bsgm2021v73n3a120221","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a120221","url":null,"abstract":"The rich decapod assemblage from the late Eocene of San Feliciano hill (Orgiano, Monti Berici, Vicenza, NE Italy) was partially recorded by De Angeli and Garassino (2002, 2014). Herein, two new crabs, Bericirinia bretoni n. gen., n. sp. (Epialtidae MacLeay, 1838) and Orgianocarcinus bericus n. gen., n. sp. (Dairidae Ng and Rodriguez, 1986) are reported from San Feliciano Hill, located in Monti Berici, Orgiano. Moreover, two well-preserved specimens assigned to Actaeites lobatus Müller and Collins, 1991 (Xanthoidea MacLeay, 1838, incertae sedis) allowed to add some morphological characters to the original description of the holotype, lacking the fronto-orbital margin.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47292787","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a281220
Torrey Nyborg, A. Garassino, Gianni Pasini, F. Vega
The new species, Pseudonecrocarcinus eichhorni (Paranecrocarcinidae Fraaije, Van Bakel, Jagt and Artal, 2008) from the Late Cretaceous (Coniacian) of Montana is herein described. This new species represents the second report for the genus from the Late Cretaceous of USA.
本文描述了蒙大拿晚白垩世(Coniacian)的新物种Pseudonecrocarcinus eichhorni (Paranecrocarcinidae Fraaije, Van Bakel, Jagt and Artal, 2008)。该新种是美国晚白垩纪该属的第二份报告。
{"title":"Pseudonecrocarcinus eichhorni n. sp. (Brachyura, Raninoida, Paranecrocarcinidae) from the Late Cretaceous (Coniacian) of Montana (USA)","authors":"Torrey Nyborg, A. Garassino, Gianni Pasini, F. Vega","doi":"10.18268/bsgm2021v73n3a281220","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a281220","url":null,"abstract":"The new species, Pseudonecrocarcinus eichhorni (Paranecrocarcinidae Fraaije, Van Bakel, Jagt and Artal, 2008) from the Late Cretaceous (Coniacian) of Montana is herein described. This new species represents the second report for the genus from the Late Cretaceous of USA.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67930066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a241220
R. Feldmann, C. Schweitzer
Two well preserved specimens of nephropid lobster from the Late Cretaceous (late Campanian) Point Loma Formation in San Diego County, California, form the basis of description of a new species of Hoploparia. The occurrence represents the southernmost fossil record of macrurans along the Pacific coast of North America and it is only the third fossil lobster from California.
{"title":"New nephropid lobster (Decapoda: Astacidea) from the late Campanian of California; extending the range of Pacific coastal fossil lobster occurrences","authors":"R. Feldmann, C. Schweitzer","doi":"10.18268/bsgm2021v73n3a241220","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a241220","url":null,"abstract":"Two well preserved specimens of nephropid lobster from the Late Cretaceous (late Campanian) Point Loma Formation in San Diego County, California, form the basis of description of a new species of Hoploparia. The occurrence represents the southernmost fossil record of macrurans along the Pacific coast of North America and it is only the third fossil lobster from California.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41938615","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-01DOI: 10.18268/bsgm2021v73n3a271220
C. Haug, G. T. Haug, V. Baranov, M. Solórzano-Kraemer, J. Haug
Neuroptera (lacewings) is today a rather small lineage of Holometabola. These representatives of Insecta have mostly predatory larvae with prominent venom-injecting stylets formed by upper and lower jaws. These impressive larvae can be found not only in the modern fauna, but sometimes also as fossils, predominantly preserved in amber. Here we report a new specimen of a lacewing larva from Miocene Mexican amber, most likely a larva of an owlfly (Ascalaphidae) with large prominent stylets, each with three teeth. These stylets arise from a more or less square-shaped head (in dorsal view) that has distinct eye hills with at least three simple eyes (stemmata) each. The trunk is rather short. Trunk segments possess finger-like protrusions carrying numerous setae, which could have been used to attach camouflaging debris to it. Remarkably, the specimen represents only the second report of a lacewing from Miocene Mexican amber, and the first larva. Additionally, we review the Miocene record of lacewing larvae. It includes otherwise only fossils preserved in Dominican amber and remains rather scarce, with only eight specimens in the literature so far. While there seem to be additional specimens in private collections, the overall number is astonishingly low compared to the numbers in Eocene and Cretaceous ambers. Ecological and taphonomic factors possibly explaining the rarity of lacewing larvae in Miocene amber are discussed here.
{"title":"An owlfly larva preserved in Mexican amber and the Miocene record of lacewing larvae","authors":"C. Haug, G. T. Haug, V. Baranov, M. Solórzano-Kraemer, J. Haug","doi":"10.18268/bsgm2021v73n3a271220","DOIUrl":"https://doi.org/10.18268/bsgm2021v73n3a271220","url":null,"abstract":"Neuroptera (lacewings) is today a rather small lineage of Holometabola. These representatives of Insecta have mostly predatory larvae with prominent venom-injecting stylets formed by upper and lower jaws. These impressive larvae can be found not only in the modern fauna, but sometimes also as fossils, predominantly preserved in amber. Here we report a new specimen of a lacewing larva from Miocene Mexican amber, most likely a larva of an owlfly (Ascalaphidae) with large prominent stylets, each with three teeth. These stylets arise from a more or less square-shaped head (in dorsal view) that has distinct eye hills with at least three simple eyes (stemmata) each. The trunk is rather short. Trunk segments possess finger-like protrusions carrying numerous setae, which could have been used to attach camouflaging debris to it. Remarkably, the specimen represents only the second report of a lacewing from Miocene Mexican amber, and the first larva. Additionally, we review the Miocene record of lacewing larvae. It includes otherwise only fossils preserved in Dominican amber and remains rather scarce, with only eight specimens in the literature so far. While there seem to be additional specimens in private collections, the overall number is astonishingly low compared to the numbers in Eocene and Cretaceous ambers. Ecological and taphonomic factors possibly explaining the rarity of lacewing larvae in Miocene amber are discussed here.","PeriodicalId":48849,"journal":{"name":"Boletin De La Sociedad Geologica Mexicana","volume":null,"pages":null},"PeriodicalIF":0.8,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41954389","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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