摘要:

The type specimen ofPelobates decheniTroschel, 1861, from Rott near Bonn, has been reinvestigated and described. It is shown to be identical with the type (and only) specimen ofZaphrissa eurypelisCope, 1866, described from the same locality. The latter name thus must be regarded as a junior synonym of the former. This also implies the reassignment ofZaphrissafrom Discoglossidae to Pelobatidae. Some unique plesiomorphic characters ofP. decheninot known in Recent frogs are pointed out.

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011913

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

A review of North American Late Cretaceous frogs demonstrates thatParadiscoglossus americanusn. gen. et sp. (Discoglossidae) andPalaeobatrachus occidentalisn. sp. (Palaeobatrachidae) definitively establish the presence of these families in the Late Cretaceous of North America (Lance Formation, Wyoming).P. occidentalisis also represented in the Late Cretaceous Hell Creek Formation in Montana. Interrelationships of palaeobatrachids are briefly discussed. A critical review ofScotiophryne pustulosa, earlier referred to the bombinid line within the Discoglossidae, establishes that there is a weak but definite case for maintaining this taxon in the Discoglossidae. Material that has been questionably referred to the pelobatid frogEopelobatesmay be referred to the genus with some confidence. Familial relationships ofTheatonius lancensisremain obscure.

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011914

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The Early Cretaceous (Barremian–Aptian) lower vertebrate fauna from Galve, Spain, includes two hybodontid sharks,Hybodus parvidensandLonchidion microselachosn. sp., as well as fragmentary remains of characteristic Mesozoic bony fishes. The salamanderAIbanerpetoncf.megacephalus(Prosirenidae) is most similar to Jurassic Portuguese specimens of this species.Galverpeton ibericumn. gen. et sp. (family incertae sedis) was probably a slim-bodied animal; it resembles the ambystomatoid–plethodontoid salamanders and is the earliest record of the more derived salamander groups. The first disarticulated specimens of the Upper Jurassic or Lower Cretaceous discoglossid frogEodiscoglossus santonjaepermit refinement of the diagnosis of this primitive frog. A variety of small reptiles is also present, including lizards, crocodilians and dinosaurs; the latter are notable in being represented by teeth of very small (young?) animals.

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011915

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Fragments of dermal bones referable to an undetermined aquatic chelonian have been discovered in the Huai Hin Lat Formation near the Chulabhorn Dam, northeastern Thailand. In the same area, this formation has also yielded ostracodes, semionotid actinopterygians, lungfishes(Ceratodus), capitosaurids(Cyclotosaurus), and phytosaurs, all suggestive of a Late Triassic (possibly Norian) age. The turtle remains are the first hitherto recorded from the Triassic of Asia, but it is still undecided whether they can be referred to one of the taxa known from the Triassic of Germany or belong to a new taxon. They resemble corresponding parts of post-Triassic chelydrid and thalassemydid turtles.

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011916

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Two partial skeletons of juvenile individuals ofStegosauruswith estimated body lengths of about 1.5 m (5 ft) and 2.6 m (8.5 ft) are described from the Morrison Formation (Upper Jurassic) of Utah and Wyoming. These juveniles differ from adults in the absence of fusion in composite bones (sacrum, scapulocoracoid, tibia–fibula–astragalus–calcaneum), the smoothness of the surface of the bones, the smaller size of ridges for muscular attachment, a proportionally more slender and elongate scapula, the relatively small size of the olecranon process of the ulna and the head of the femur, and the possible absence of dermal plates (but tail spines were present). Apart from the ratios of the length of the femur to those of the humerus and ilium, and the form of the scapula, ilium and fibula, the bones of juvenile individuals ofStegosaurusare very similar to those of juvenile individuals of the stegosaurKentrosaurus(Upper Jurassic, East Africa). A probable sexual dimorphism in the sacrum with either four (?female) or five (?male) sacral ribs occurs inKentrosaurus. The additional sacral rib attaches anterior to the other four; a rib in the Utah juvenile has the same distinctive shape, and it thus may have been a male (sacra ofStegosauruswith four sacral ribs have been previously illustrated).

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011917

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Several recently discovered fossil specimens add to our knowledge of plesiadapiform primates.Micromomys willwoodensis, new species, is a diminutive microsyopid from the early Eocene (early Wasatchian) Willwood Formation of the Clark's Fork Basin, Wyoming. It is larger and more specialized than late PaleoceneM. vossaeandM. silvercouleei. Elwynella oreasis a new genus and species of paromomyid from the middle Eocene (early Bridgerian) Aycross Formation of northwestern Wyoming. It is most closely related toPhenacolemur, but differs from all other post-Tiffanian paromomyids in retention of P3and in details of incisor morphology and molar trigonid structure. New specimens of the microsyopidTinimomys graybulliensisare described, including a nearly complete dentary from the Wasatchian of the Bighorn Basin and the first record from probable Clarkforkian (latest Paleocene–earliest Eocene) beds of the Powder River Basin. The first Wasatchian specimen ofPlesiadapisis described and illustrated.

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011918

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

Fourteen taxa are described from Hemingfordian (early Miocene) to Hemphillian (early Pliocene) deposits of western North America and Florida. New taxa includeEdaphocyon lautus, new species;Arctonasua floridana, new genus and species;Arctonasua gracilis, new species;Arctonasua minima, new species;Arctonasua eurybates, new species;Arctonasua fricki, new species;Lichnocyonphoenicus, new genus and species; andParanasua biradica, new genus and species. The earliest known occurrences (Hemphillian) ofNasuaandProcyonare documented. Cladistic analysis demonstrates thatParanasuais the primitive sister taxon ofProcyonandNasua; thatArctonasuais probably most closely related to the late TertiaryCyonasuagroup of South American procyonines; and that the primitive sister group of the Procyoninae discussed in this paper includesBassariscusand the European Agenian and Orleanian (early Miocene) genusBroiliana.

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011919

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

This paper presents the most diverse Pliocene lagomorph fauna yet reported from Mexico. Four genera and five species are herein recognized from several localities in the central state of Guanajuato. These presently discovered taxa were compared with previously described lagomorphs from North America; and three, one genus and two species, are considered new. Additionally, one other species could possibly be new. Taxa which have been reported elsewhere includeHypolagus, Pratilepus ?kansasensisandNotolaguscf.velox. Apparently no published record exists which describes Pliocene lagomorphs as far south in North America as those listed in this study.

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011920

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

摘要:

The Mount Eden fauna, first described by Childs Frick in 1921, is an important late Hemphillian mammalian fauna from the San Timoteo Badlands of southern California. Identification ofRepomys maxumiMay, an early hypsodont cricetid rodent, and the results of geomagnetic-polarity determinations indicate that this fauna correlates with the lower reversed part of the Gilbert Magnetic Polarity Chron and must be older than the C2 (Thvera) normal-polarity event of this Chron. The fauna is between 5.0 and 5.4 m.y. old according to the temporal calibration of the geomagnetic stratigraphy here followed. This age approximately dates the change from Peninsular Ranges source to a Transverse Ranges source for sediment in the San Timoteo Badlands.

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011921

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor

ISSN:0272-4634    

DOI:10.1080/02724634.1982.10011922

出版商:Taylor & Francis Group    

年代:1982

数据来源: Taylor