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Decapod crustaceans from the lower Miocene Qom Formation of the Isfahan area, Central Iran 伊朗中部伊斯法罕地区下中新世库姆组的十足目甲壳类动物
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 10.18268/bsgm2021v73n3a140521
M. Hyžný, A. Bahrami, M. Yazdi, H. Torabi
From the lower Miocene (Burdigalian) of the Qom Formation, exposed in three sections (Kuh-e-Donbeh, Bagher-Abad, and Vartun) in Central Iran, a deca-pod crustacean assemblage is described. The specimens exhibit two modes of preservation: carapaces (either isolated or with attached appendages) and isolated cheliped elements. All studied specimens are fractured and/or eroded. Based on this moderately preserved material, three brachyuran crab taxa are identified, including Mursia cf. lienharti (Bachmayer, 1962), Palaeocarpilius rugifer Stoliczka, 1871, and Necronectes sp. The occurrence of P. rugifer represents the youngest confirmed occurrence of the species, whereas other two taxa represent the first confirmed Iranian occurrences of respec-tive genera. This report enriches our knowledge on Miocene decapod assemblages of Iran, and thus helping to better understand the decapod migratory patterns along the Tethyan Sea-way.
从伊朗中部库姆组下中新世(Burdigalian)的三个部分(Kuh-e-Donbeh、Bagher Abad和Vartun)暴露出来,描述了一个十足甲壳类动物组合。这些标本表现出两种保存模式:甲壳(单独或附肢)和单独的螯足元素。所有研究的试样均断裂和/或侵蚀。基于这种保存适度的材料,确定了三个短吻蟹分类群,包括Mursia cf.lienharti(Bachmayer,1962)、Paleocarpiius rugifer Stoliczka,1871和Necronectes sp.。P.rugifer的出现代表了该物种最年轻的已确认出现,而其他两个分类群代表了伊朗首次确认出现的呼吸属。本报告丰富了我们对伊朗中新世十足目动物组合的了解,从而有助于更好地了解特提斯海沿岸的十足目动物迁徙模式。
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引用次数: 3
Notes on some Late Cretaceous goniasterid starfish (Echinodermata, Asteroidea) from Belgium and Germany 比利时和德国部分晚白垩世角星海星(棘皮动物纲,小行星亚目)的研究
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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。
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引用次数: 0
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) 首次发现日本北海道Cenomanian(上白垩纪)冷泉沉积物中的Goniodromiti螃蟹,并重新描述了膨胀Sabellidromites(Collins和Karasawa,1993)(十足目:Goniodromididae)
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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)。
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引用次数: 0
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 墨西哥琥珀寄生虫(螨虫:Prostigmata)的第一个化石记录,包括Johnstonianidae Thor的一个新属和种的描述,1935年
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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.
描述了保存在墨西哥恰帕斯下中新世琥珀中的一种成虫和一种Deutoninfa的古二化螟微皮基因et sp.nov。这一新的尘螨分类群是墨西哥琥珀矿床的寄生虫(蜱螨:长臂猿:前鞭毛虫)队列的第一个记录,也是约翰斯顿科在全球范围内的第一个化石记录。
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引用次数: 2
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 墨西哥科阿韦拉圣马科斯地区的地质观测:Laramide造山运动期间Sabinas盆地沉积层状铜银成矿的案例
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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.
墨西哥东北部科阿韦拉的圣马科斯地区的沉积物层状铜-银矿化主要发生在萨宾纳斯盆地圣马科斯组下盘硅碎屑红层和Cupido组上盘碳酸盐层之间的早白垩世氧化还原边界。深生矿矿化主要以辉铜矿群矿物的形式存在,另有斑铜矿和黄铜矿,到处都以浸染状和脉/细脉的形式出现。浅生含铜氧化物(孔雀石、斑蝥石、天青石、温石棉)是矿化的主要表面表现形式。Sabinas盆地的较低地层以及基底花岗质岩石的矿脉中也出现了额外的沉积层状铜-银矿化,尽管不稳定,因此跨越了约3000 m的盆地地层。在最发达的地方,层状矿化在区域圣马科斯断层系统附近显示出强烈的结构控制。这条主要的边界断层具有区域性,具有许多活动期,控制着萨宾纳斯盆地的演化。对矿化的结构控制包括堆叠的浅角度、平行的层理、东北向边缘的逆冲断层和相关的拖曳褶皱,以及大量陡峭的东北向含铜矿脉和细脉。矿化脉、细脉与顺层平行逆冲断层呈相互横切关系。这些元素都是一致的,并与伴随圣马科斯断层系统反向运动的水平缩短的区域东北走向相协调。San Marcos断层系统和整个古近系Sabinas盆地在约60至40 Ma的反转,是Laramide(墨西哥)造山运动期间大规模收缩变形的结果。因此,San Marcos和更大的Coahuila地区其他地方沉积的层状铜-银矿化的侵位被解释为墨西哥造山带建造期间Sabinas盆地的造山缩短、岩石静载和挤压导致的大规模含金属流体排出、迁移和沉淀的自然结果。尽管Sabinas盆地中宿主地层的沉积发生在与墨西哥湾开口相关的克拉通纪周围环境中,但在造山隆升和原始盆地转化为造山-前陆对期间,发生了以沉积物为宿主的层状铜银矿化,与世界上一些最大的沉积层铜省相似。
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引用次数: 2
First fossil Schizopteridae (Hemiptera: Heteroptera) in Miocene amber from Chiapas, Mexico 墨西哥恰帕斯州中新世琥珀中的第一个分裂蝶科化石(半翅目:异翅目)
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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.
本文以一个雌性标本为基础,描述了一个新属和一个新种,即Hypsotsijilia bretoni Cifuentes Ruiz和Brailovsky gen.nov.,sp.nov。它代表了墨西哥恰帕斯州中新世早期琥珀中第一个裂殖蛛科化石记录。将其与相关分类群进行了比较,并讨论了河口古环境,与之前在其他河口琥珀矿床中引用的亚科相匹配。
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引用次数: 0
New report of fossil crabs (Decapoda, Brachyura) from the late Eocene of San Feliciano Hill (Orgiano, Monti Berici, Vicenza, NE Italy) 意大利东北部维琴察Monti Berici地区圣费利西亚诺山晚始新世蟹类化石(十足目,短尾目)新报告
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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。
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引用次数: 0
Pseudonecrocarcinus eichhorni n. sp. (Brachyura, Raninoida, Paranecrocarcinidae) from the Late Cretaceous (Coniacian) of Montana (USA) 美国蒙大拿州晚白垩世(Coniacian) pseudoonecrocarcinus eichhorni n. sp.(短肢目,raninoda,副anecrocarcinidae)
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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。
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引用次数: 1
New nephropid lobster (Decapoda: Astacidea) from the late Campanian of California; extending the range of Pacific coastal fossil lobster occurrences 产于加利福尼亚坎帕尼亚晚期的新肾形龙虾(十足目:虾目);扩大太平洋沿岸龙虾化石的出现范围
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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.
加利福尼亚州圣地亚哥县白垩纪晚期(坎帕尼亚晚期)洛马角组的两个保存完好的肾皮龙虾标本构成了Hoploparia新种描述的基础。这是北美洲太平洋沿岸最南端的macrurans龙虾化石记录,也是来自加利福尼亚州的第三个龙虾化石。
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引用次数: 0
An owlfly larva preserved in Mexican amber and the Miocene record of lacewing larvae 墨西哥琥珀中保存的猫头鹰幼虫和中新世草食幼虫记录
IF 0.8 4区 地球科学 Q4 GEOLOGY Pub Date : 2021-12-01 DOI: 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.
神经翅目(草翅)是今天全代谢目的一个相当小的分支。这些昆虫的代表大多是掠食性幼虫,具有突出的毒液注射柱头,由上下颚形成。这些令人印象深刻的幼虫不仅可以在现代动物群中找到,有时也可以作为化石发现,主要保存在琥珀中。在这里,我们报告了一种来自中新世墨西哥琥珀的草蛉幼虫的新标本,它很可能是一种猫头鹰的幼虫(Ascalaphidae),具有大而突出的花柱,每个都有三颗牙齿。这些花柱产生于一个或多或少方形的头(在背面),有明显的眼丘,每个至少有三个简单的眼(茎)。树干很短。躯干部分有手指状的突起,上面有许多刚毛,可以用来附着伪装碎片。值得注意的是,该标本仅代表了第二份来自中新世墨西哥琥珀的草蛉报告,以及第一份幼虫。此外,我们还回顾了中新世草蛉幼虫的记录。除此之外,它只包括在多米尼加琥珀中保存的化石,而且仍然相当稀少,到目前为止文献中只有8个标本。虽然私人收藏中似乎还有其他标本,但与始新世和白垩纪琥珀的数量相比,总数少得惊人。本文讨论了可能解释中新世琥珀中草蛉幼虫稀少的生态和地理因素。
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引用次数: 11
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Boletin De La Sociedad Geologica Mexicana
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