Pub Date : 2010-12-31DOI: 10.1080/25761900.2022.12131814
J. Hooker
ABSTRACT Forty-six species-group land mammal taxa are described from the newly named marine Blackheath Formation (early Ypresian, Eocene) of Abbey Wood, London, UK. Of these, nine are new: Ailuravus mitchelli, Sparnacomys georgei, Neomatronella gassoni, Apatemys prouti, Viverravus lawsoni, Miacis rundlei, Arctocyonides jefferyi, Diacodexis morrisi and Pliolophus barnesi. The genera Peradectes, Palaeosinopa, Plesiesthonyx, Pseudoparamys, Sparnacomys, Neomatronella, Macrocranion, Wyonycteris, Didelphodus, Apatemys, Palaeonictis, Prototomus, Viverravus, Uintacyon, Pachyaena and Phenacodus and the orders Tillodontia and Mesonychia are described for the first time from the UK. The tillodont Franchaius is synonymized with Plesiesthonyx and the valid species reduced to three; the rodent Paramys ageiensis is resurrected and transferred to Pseudoparamys; the bat Eppsinycteris is transferred from Emballonuridae to the new family Eppsinycterididae; the primate Cantius eppsi is shown to be more closely related to North American notharctids than to European cercamoniines; Coryphodon anthracoideus is re-synonymized with C. eocaenus, the identifications of which in North America are modified; cladistic analysis of early North American and European equoids demonstrates a distinct clade on each continent. Correlation of the Blackheath Formation uses European dinocyst and palynological zonations and short-ranged mammal species shared with the Bighorn Basin, USA. Ecological diversity analysis of the Abbey Wood mammal fauna shows that it inhabited a tropical-type forest environment. Taphonomy and stratigraphy suggest a local origin for the mammal assemblage. Selective similarities in the mammals between Abbey Wood and North America suggest that continental interchange via Greenland was climatically controlled half a million years after the Paleocene-Eocene boundary.
{"title":"The Mammal Fauna of the Early Eocene Blackheath Formation of Abbey Wood, London","authors":"J. Hooker","doi":"10.1080/25761900.2022.12131814","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131814","url":null,"abstract":"ABSTRACT Forty-six species-group land mammal taxa are described from the newly named marine Blackheath Formation (early Ypresian, Eocene) of Abbey Wood, London, UK. Of these, nine are new: Ailuravus mitchelli, Sparnacomys georgei, Neomatronella gassoni, Apatemys prouti, Viverravus lawsoni, Miacis rundlei, Arctocyonides jefferyi, Diacodexis morrisi and Pliolophus barnesi. The genera Peradectes, Palaeosinopa, Plesiesthonyx, Pseudoparamys, Sparnacomys, Neomatronella, Macrocranion, Wyonycteris, Didelphodus, Apatemys, Palaeonictis, Prototomus, Viverravus, Uintacyon, Pachyaena and Phenacodus and the orders Tillodontia and Mesonychia are described for the first time from the UK. The tillodont Franchaius is synonymized with Plesiesthonyx and the valid species reduced to three; the rodent Paramys ageiensis is resurrected and transferred to Pseudoparamys; the bat Eppsinycteris is transferred from Emballonuridae to the new family Eppsinycterididae; the primate Cantius eppsi is shown to be more closely related to North American notharctids than to European cercamoniines; Coryphodon anthracoideus is re-synonymized with C. eocaenus, the identifications of which in North America are modified; cladistic analysis of early North American and European equoids demonstrates a distinct clade on each continent. Correlation of the Blackheath Formation uses European dinocyst and palynological zonations and short-ranged mammal species shared with the Bighorn Basin, USA. Ecological diversity analysis of the Abbey Wood mammal fauna shows that it inhabited a tropical-type forest environment. Taphonomy and stratigraphy suggest a local origin for the mammal assemblage. Selective similarities in the mammals between Abbey Wood and North America suggest that continental interchange via Greenland was climatically controlled half a million years after the Paleocene-Eocene boundary.","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129521634","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2010-12-31DOI: 10.1080/25761900.2022.12131815
S. Donovan, Rosanne E. Widdison, D. N. Lewis, F. E. Fearnhead
ABSTRACT In Part 2, we describe the dicyclic non-camerate crinoids, the Cladida, including three orders, the Cyathocrinida (five genera, 15 species, excluding Crotalocrinites pulcher (Hisinger)), Dendrocrinida (six genera, 15 species) and Flexibilia (13 genera, 17 species), including those taxa left in open nomenclature; two further species are incerti ordinis. One new genus is erected, the crotalocrinitid Pleuroptyx Widdison gen. nov., type species Apiocrinites? punctatus Hisinger. Five new nominal species are described, namely the cyathocrinitid Cyathocrintes? fonei sp. nov. and the crotalocrinitid Crotalocrinites enodis Widdison sp. nov. (both from the Much Wenlock Limestone Formation of the Dudley area), and the dendrocrinids 'Dendrocrinus' whitei sp. nov. (Upper Llandovery Hughley Shales, Shropshire), Dendrocrinus? johnphillipsi sp. nov. (Upper Ludlow Leintwardine Formation, Herefordshire) and Plicodendrocrinus brevis (Ramsbottom MS) sp. nov. (Wenlock or Ludlow, Staffordshire). In an addendum to Part 1, the calceocrinid Chirocrinus baingowardi sp. nov. is described (Lower Llandovery Mulloch Hill Sandstone Formation, Ayrshire).
{"title":"The British Silurian Crinoidea","authors":"S. Donovan, Rosanne E. Widdison, D. N. Lewis, F. E. Fearnhead","doi":"10.1080/25761900.2022.12131815","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131815","url":null,"abstract":"ABSTRACT In Part 2, we describe the dicyclic non-camerate crinoids, the Cladida, including three orders, the Cyathocrinida (five genera, 15 species, excluding Crotalocrinites pulcher (Hisinger)), Dendrocrinida (six genera, 15 species) and Flexibilia (13 genera, 17 species), including those taxa left in open nomenclature; two further species are incerti ordinis. One new genus is erected, the crotalocrinitid Pleuroptyx Widdison gen. nov., type species Apiocrinites? punctatus Hisinger. Five new nominal species are described, namely the cyathocrinitid Cyathocrintes? fonei sp. nov. and the crotalocrinitid Crotalocrinites enodis Widdison sp. nov. (both from the Much Wenlock Limestone Formation of the Dudley area), and the dendrocrinids 'Dendrocrinus' whitei sp. nov. (Upper Llandovery Hughley Shales, Shropshire), Dendrocrinus? johnphillipsi sp. nov. (Upper Ludlow Leintwardine Formation, Herefordshire) and Plicodendrocrinus brevis (Ramsbottom MS) sp. nov. (Wenlock or Ludlow, Staffordshire). In an addendum to Part 1, the calceocrinid Chirocrinus baingowardi sp. nov. is described (Lower Llandovery Mulloch Hill Sandstone Formation, Ayrshire).","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131106521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-31DOI: 10.1080/25761900.2022.12131813
M. Edmunds
ABSTRACT The ammonite genus Eoderoceras Spath is reviewed in the light of recent discoveries and an examination of type and museum-curated material. It is argued that the bispinate type species, E. bispinigerum (Buckman), for which a neotype is designated, is morphologically very close to ammonites from Tethyan and Pacific localities that have been referred in recent literature to the genus Paramicroderoceras Dommergues, Ferretti & Meister. The type species of that genus, namely Microderoceras birchiades Rosenberg, is poorly characterized, and the lectotype designated herein cannot be readily distinguished from Eoderoceras, hence Paramicroderoceras is regarded as a junior synonym. Apart from the type species, which locally dominates a short stratigraphical thickness at its type locality on the Dorset coast, bispinate Eoderoceras are known from only sporadic occurrences in the British Lower Jurassic. However, species interpreted as being the unispinate descendants of Eoderoceras, here accorded generic status as Eteoderoceras gen. nov., are abundant in much of the British Raricostatum Zone and can be divided into a number of different stratigraphically sequential species. The genus Tetraspidoceras Spath is also described as it is thought likely to be a close relative and direct descendant of Eoderoceras that occurs in the British fossil record in the Upper Sinemurian and in the Taylori Subzone of the Jamesoni Zone (Lower Pliensbachian), containing a small number of species. The family Eoderoceratidae, to which these genera belong, is discussed to provide a broader evolutionary context; some important unresolved systematic issues are highlighted.
{"title":"A Revision of the Lower Jurassic Ammonite Genus Eoderoceras Spath and its Immediate Descendants and Other Relatives","authors":"M. Edmunds","doi":"10.1080/25761900.2022.12131813","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131813","url":null,"abstract":"ABSTRACT The ammonite genus Eoderoceras Spath is reviewed in the light of recent discoveries and an examination of type and museum-curated material. It is argued that the bispinate type species, E. bispinigerum (Buckman), for which a neotype is designated, is morphologically very close to ammonites from Tethyan and Pacific localities that have been referred in recent literature to the genus Paramicroderoceras Dommergues, Ferretti & Meister. The type species of that genus, namely Microderoceras birchiades Rosenberg, is poorly characterized, and the lectotype designated herein cannot be readily distinguished from Eoderoceras, hence Paramicroderoceras is regarded as a junior synonym. Apart from the type species, which locally dominates a short stratigraphical thickness at its type locality on the Dorset coast, bispinate Eoderoceras are known from only sporadic occurrences in the British Lower Jurassic. However, species interpreted as being the unispinate descendants of Eoderoceras, here accorded generic status as Eteoderoceras gen. nov., are abundant in much of the British Raricostatum Zone and can be divided into a number of different stratigraphically sequential species. The genus Tetraspidoceras Spath is also described as it is thought likely to be a close relative and direct descendant of Eoderoceras that occurs in the British fossil record in the Upper Sinemurian and in the Taylori Subzone of the Jamesoni Zone (Lower Pliensbachian), containing a small number of species. The family Eoderoceratidae, to which these genera belong, is discussed to provide a broader evolutionary context; some important unresolved systematic issues are highlighted.","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122647439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-12-31DOI: 10.1080/25761900.2022.12131812
S. Donovan, D. N. Lewis, F. E. Fearnhead, Rosanne E. Widdison
ABSTRACT This is the first monographic study of the Silurian Crinoidea of the British Isles since 1839. In Part 1, we describe the Disparida including three families — the myelodactylids (one genus, six species), pisocrinids (two genera, five species) and calceocrinids (three genera, twelve species). Myelodactylids and calceocrinids are most diverse in the Wenlock, but are not known from the Ludlow. Three species of pisocrinids are known from the Ludlow. Two new species are described, the calceocrinids Calceocrinus nidamentum sp. nov. and Chirocrinus broweri sp. nov., both from the Much Wenlock Limestone Formation of the Dudley area.
{"title":"The British Silurian Crinoidea","authors":"S. Donovan, D. N. Lewis, F. E. Fearnhead, Rosanne E. Widdison","doi":"10.1080/25761900.2022.12131812","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131812","url":null,"abstract":"ABSTRACT This is the first monographic study of the Silurian Crinoidea of the British Isles since 1839. In Part 1, we describe the Disparida including three families — the myelodactylids (one genus, six species), pisocrinids (two genera, five species) and calceocrinids (three genera, twelve species). Myelodactylids and calceocrinids are most diverse in the Wenlock, but are not known from the Ludlow. Three species of pisocrinids are known from the Ludlow. Two new species are described, the calceocrinids Calceocrinus nidamentum sp. nov. and Chirocrinus broweri sp. nov., both from the Much Wenlock Limestone Formation of the Dudley area.","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124910568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-12-31DOI: 10.1080/25761900.2022.12131809
L. Cocks
ABSTRACT All brachiopod species described from the Lower Palaeozoic of Great Britain and Ireland are listed in an appropriate genus and arranged within an updated stratigraphical framework and also within the much-changed classification recently published in the revised edition of the Treatise on Invertebrate Paleontology. The type specimen museum registration number, the stratigraphical horizon and the geographical locality for each species are given, with National Grid References for Great Britain (but not Ireland) where possible. Lower Palaeozoic brachiopods which have been described and illustrated since 1960, but only identified to genera, are also listed (apart from those in more general literature). 1501 taxa are discussed, of which 1075 are species and subspecies considered valid, 231 are in open nomenclature, 152 are synonyms, 34 are nomina dubia and nine belong to other phyla (although originally described as brachiopods). More than a hundred holotypes or lectotypes of species originally erected some years ago are figured, many of which are photographed for the first time. No new taxa are published here.
{"title":"A Revised Review of British Lower Palaeozoic Brachiopods","authors":"L. Cocks","doi":"10.1080/25761900.2022.12131809","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131809","url":null,"abstract":"ABSTRACT All brachiopod species described from the Lower Palaeozoic of Great Britain and Ireland are listed in an appropriate genus and arranged within an updated stratigraphical framework and also within the much-changed classification recently published in the revised edition of the Treatise on Invertebrate Paleontology. The type specimen museum registration number, the stratigraphical horizon and the geographical locality for each species are given, with National Grid References for Great Britain (but not Ireland) where possible. Lower Palaeozoic brachiopods which have been described and illustrated since 1960, but only identified to genera, are also listed (apart from those in more general literature). 1501 taxa are discussed, of which 1075 are species and subspecies considered valid, 231 are in open nomenclature, 152 are synonyms, 34 are nomina dubia and nine belong to other phyla (although originally described as brachiopods). More than a hundred holotypes or lectotypes of species originally erected some years ago are figured, many of which are photographed for the first time. No new taxa are published here.","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"83 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127023876","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2007-12-31DOI: 10.1080/25761900.2022.12131808
T. Vandenbroucke
ABSTRACT Recent developments in chronostratigraphical procedure and new biostratigraphical insights have necessitated revision of the Ordovician System's chronostratigraphy. As a part of this process, the chitinozoan assemblages from the historical type areas of the British Caradoc and Ashgill Series are described, and the first Upper Ordovician chitinozoan biozonation for British Avalonia is established. The historical Caradoc and Ashgill type sections in the Anglo-Welsh basin yield important chitinozoan assemblages; these data are supplemented with information from other British key sections with accurate graptolite control. As a result, the established chitinozoan biozonation for British Avalonia is tied closely to the British chronostratigraphical framework and graptolite biostratigraphy. This volume provides systematic descriptions of the chitinozoan taxa recovered from the sections studied during this biozonation project in the UK, comprising 23 genera and 131 species, of which five are new: Acanthochitina latebrosa, Acanthochitina pudica, Belonechitina brittanica, Hercochitina frangiata and Spinachitina katherinae.
{"title":"Upper Ordovician Chitinozoans from the British Historical Type Areas and Adjacent Key Sections","authors":"T. Vandenbroucke","doi":"10.1080/25761900.2022.12131808","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131808","url":null,"abstract":"ABSTRACT Recent developments in chronostratigraphical procedure and new biostratigraphical insights have necessitated revision of the Ordovician System's chronostratigraphy. As a part of this process, the chitinozoan assemblages from the historical type areas of the British Caradoc and Ashgill Series are described, and the first Upper Ordovician chitinozoan biozonation for British Avalonia is established. The historical Caradoc and Ashgill type sections in the Anglo-Welsh basin yield important chitinozoan assemblages; these data are supplemented with information from other British key sections with accurate graptolite control. As a result, the established chitinozoan biozonation for British Avalonia is tied closely to the British chronostratigraphical framework and graptolite biostratigraphy. This volume provides systematic descriptions of the chitinozoan taxa recovered from the sections studied during this biozonation project in the UK, comprising 23 genera and 131 species, of which five are new: Acanthochitina latebrosa, Acanthochitina pudica, Belonechitina brittanica, Hercochitina frangiata and Spinachitina katherinae.","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114453162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-12-31DOI: 10.1080/25761900.2022.12131806
S. Nikolaeva
ABSTRACT Carboniferous ammonoids purchased by the Zoology Department of the British Museum in 1841 from W. Gilbertson and presently housed in the Palaeontology Department of the Natural History Museum, London were the core material for the ammonoid descriptions in "Illustrations of the Geology of Yorkshire. Volume 2" (Phillips, 1836). Phillips' monograph contained a geological map, sections of outcrops, systematic descriptions and plates of fossils from the Mountain Limestone District in Yorkshire. Phillips' descriptions were much abbreviated, while his original illustrations were pencil and ink drawings. Lack of information on the type species described by Phillips made their identifications in Carboniferous faunas for over 150 years uncertain. Re-examination of ammonoids from the Gilbertson Collection revealed that the type specimens contained in the collection after being re-described and re-figured provide much additional information. There are 182 specimens representing 35 species (3 holotypes, 15 lectotypes, and 58 paralectotypes), the identity of which was confirmed as a result of this study. Examination of Phillips' original drawings and notes in the Library of Oxford University Museum of Natural History and their comparison with the material from the Gilbertson Collection revealed that some illustrations based on specimens from the Gilbertson Collection were omitted from the final publication. These specimens are here re-described and illustrated, and their status as types is confirmed.
{"title":"The Carboniferous Ammonoids from the Gilbertson Collection Described by John Phillips","authors":"S. Nikolaeva","doi":"10.1080/25761900.2022.12131806","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131806","url":null,"abstract":"ABSTRACT Carboniferous ammonoids purchased by the Zoology Department of the British Museum in 1841 from W. Gilbertson and presently housed in the Palaeontology Department of the Natural History Museum, London were the core material for the ammonoid descriptions in \"Illustrations of the Geology of Yorkshire. Volume 2\" (Phillips, 1836). Phillips' monograph contained a geological map, sections of outcrops, systematic descriptions and plates of fossils from the Mountain Limestone District in Yorkshire. Phillips' descriptions were much abbreviated, while his original illustrations were pencil and ink drawings. Lack of information on the type species described by Phillips made their identifications in Carboniferous faunas for over 150 years uncertain. Re-examination of ammonoids from the Gilbertson Collection revealed that the type specimens contained in the collection after being re-described and re-figured provide much additional information. There are 182 specimens representing 35 species (3 holotypes, 15 lectotypes, and 58 paralectotypes), the identity of which was confirmed as a result of this study. Examination of Phillips' original drawings and notes in the Library of Oxford University Museum of Natural History and their comparison with the material from the Gilbertson Collection revealed that some illustrations based on specimens from the Gilbertson Collection were omitted from the final publication. These specimens are here re-described and illustrated, and their status as types is confirmed.","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"103 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114601987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2006-12-31DOI: 10.1080/25761900.2022.12131807
R. Sadleir, P. Barrett, H. P. Powell
ABSTRACT Recent work on theropod phylogeny has concentrated on the interrelationships of taxa that lie close to the ancestry of birds (coelurosaurs), whereas only a small number of studies have investigated the evolution of more primitive theropods (e.g. basal tetanurans). Ghost lineages implied by theropod phylogenies suggest that the Middle Jurassic was an important time in tetanuran evolution, witnessing the initial radiation and diversification of the clade. However, Middle Jurassic theropod specimens are rare and often incomplete. The holotype specimen of Eustreptospondylus oxoniensis, from the Middle Oxford Clay (upper Callovian) of Oxfordshire, England, represents the most complete Middle Jurassic theropod specimen from Europe. This taxon therefore has the potential to shed much needed light on basal tetanuran evolution at a critical time in the clade's history. Although several previous authors considered the anatomy and systematics of Eustreptospondylus, none of these accounts provided a comprehensive description and their utility is therefore limited. Here, we provide a detailed redescription of Eustreptospondylus and confirm its phylogenetic position as a basal member of Spinosauroidea. The taxon exhibits several anatomical features that appear to be incipient versions of the highly specialized character states found in more derived members of the clade (e.g. development of the premaxillary/maxillary embayment). The results of this work also suggest that Spinosauroidea may have originated in the Middle Jurassic of Europe, later dispersing to Gondwana.
{"title":"The Anatomy and Systematics of Eustreptospondylus Oxoniensis, A Theropod Dinosaur from the Middle Jurassic of Oxfordshire, England","authors":"R. Sadleir, P. Barrett, H. P. Powell","doi":"10.1080/25761900.2022.12131807","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131807","url":null,"abstract":"ABSTRACT Recent work on theropod phylogeny has concentrated on the interrelationships of taxa that lie close to the ancestry of birds (coelurosaurs), whereas only a small number of studies have investigated the evolution of more primitive theropods (e.g. basal tetanurans). Ghost lineages implied by theropod phylogenies suggest that the Middle Jurassic was an important time in tetanuran evolution, witnessing the initial radiation and diversification of the clade. However, Middle Jurassic theropod specimens are rare and often incomplete. The holotype specimen of Eustreptospondylus oxoniensis, from the Middle Oxford Clay (upper Callovian) of Oxfordshire, England, represents the most complete Middle Jurassic theropod specimen from Europe. This taxon therefore has the potential to shed much needed light on basal tetanuran evolution at a critical time in the clade's history. Although several previous authors considered the anatomy and systematics of Eustreptospondylus, none of these accounts provided a comprehensive description and their utility is therefore limited. Here, we provide a detailed redescription of Eustreptospondylus and confirm its phylogenetic position as a basal member of Spinosauroidea. The taxon exhibits several anatomical features that appear to be incipient versions of the highly specialized character states found in more derived members of the clade (e.g. development of the premaxillary/maxillary embayment). The results of this work also suggest that Spinosauroidea may have originated in the Middle Jurassic of Europe, later dispersing to Gondwana.","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2006-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133750798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2005-12-31DOI: 10.1080/25761900.2022.12131805
C. Barras
ABSTRACT The taxonomy of the British Jurassic irregular echinoids is revised and updated from that given by T. Wright between 1857 and 1878. There is emphasis on cross-correlation with material from continental Europe. The British Jurassic fauna comprises 33 species in 17 genera. One new genus (Pronucleolites) and two new species (Galeropygus parviphyllus and 'Pronucleolites' crickleyensis) are described. A new cladistic analysis, incorporating all of the British taxa, provides a well resolved phylogeny for early irregular echinoids.
{"title":"British Jurassic Irregular Echinoids","authors":"C. Barras","doi":"10.1080/25761900.2022.12131805","DOIUrl":"https://doi.org/10.1080/25761900.2022.12131805","url":null,"abstract":"ABSTRACT The taxonomy of the British Jurassic irregular echinoids is revised and updated from that given by T. Wright between 1857 and 1878. There is emphasis on cross-correlation with material from continental Europe. The British Jurassic fauna comprises 33 species in 17 genera. One new genus (Pronucleolites) and two new species (Galeropygus parviphyllus and 'Pronucleolites' crickleyensis) are described. A new cladistic analysis, incorporating all of the British taxa, provides a well resolved phylogeny for early irregular echinoids.","PeriodicalId":134015,"journal":{"name":"Monographs of the Palaeontographical Society","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2005-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124123066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2004-12-31DOI: 10.1080/25761900.2022.12131802
J. Watson, C. Henderson, Helen A. Cusack, S. Drury
ABSTRACT Cycadales in the English Wealden fossil flora are revised and attributed to about 34 species. The geological and evolutionary history of fossil cycads and the nature of extant cycads are outlined. Short reviews summarise the geological setting and previous work on the Wealden flora. 16 leaf species, 12 of them new, are assigned to 8 existing form-genera and one newly erected leaf genus; 4 new species of scale-leaves. A new species of megasporophyll, a new female cone species with ovules, a male cone species containing pollen and 2 large trunk species are described as named species. Nine types of isolated seeds are distinguished and described. The morphology and cuticular anatomy of extant cycad organs, selected for their similarity to the fossil species, are described, figured and compared to their Wealden counterparts. Reconstructions are presented for the leafy shoot of Nilssonia, the female cone Zamiostrobus, and the male cone Androstrobus.
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