Micropycnodon, New Name for Pycnomicrodon Hibbard and Graffham Not Hay

Hibbard, Claude W.; Graffham, Allen

doi:10.2307/3625456

Cited by 10 publications

(5 citation statements)

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“… Dongargaon (Maastrichtian) in India (“ Pycnodus ” lametae ; Woodward, 1908 ; Mohabey and Udhoji, 1996 ). Niobrara formation, Kansas (Coniacian–Turonian) in the U.S.A ( Micropycnodon ; Hibbard and Griffham, 1941 , 1945 ; Dunkle and Hibbard, 1946 ; Nursall, 1999 ; Cronin and Shimada, 2019 ). …”

Section: Discussionmentioning

confidence: 99%

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Njoerdichthys dyckerhoffi gen. et sp. nov. (Pycnodontiformes, lower Turonian) northward migration caused by the Cretaceous Thermal Maximum

Cawley

Lehmann

Wiese

et al. 2020

Cretaceous Research

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A new pycnodont taxon, Njoerdichthys dyckerhoffi gen. et sp. nov., from the Turonian of the Lower Saxony Basin of Germany is described and its systematic positions is established based on phylogenetic analyses of three specimens using slightly altered data matrices. All analyses display some differences to previous analyses but show very similar results to each other apart from the interpretation of the position of several taxa such as, e.g., Palaeobalistum . The new pycnodontiform specimens from northwestern Germany are unambiguously identified as a derived member of Pycnodontidae with close relationships to Abdobalistum and Nursallia ? goedeli because of the unique combination of characters. One of the three specimens represents a juvenile form. Its morphological characters are limited, but it shares some characters with Njoerdichthys dyckerhoffi gen. et sp. nov. and is consequently allocated to the new taxon. The systematic placement of the new taxon, Njoerdichthys gen. nov., within Pycnodontidae is surprising since it does not display the one autapomorphic character (postparietal brush-like extension for muscle attachment) previously proposed to define this clade, but rather displays a combination of derived and homoplastic characters indicating that the definition of supra-generic taxa needs to be re-evaluated in the future by including more and new taxa. The distribution of pycnodontiform fishes in the Cretaceous appears to concur with changes in global climatic conditions, where high upper-ocean temperatures and high sea levels allow these fishes to migrate into higher latitudes as evidenced by the occurrence of the new taxon and Anomoeodus subclavatus in the Campanian of Sweden.

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Section: Discussionmentioning

confidence: 99%

“…Niobrara formation, Kansas (Coniacian–Turonian) in the U.S.A ( Micropycnodon ; Hibbard and Griffham, 1941 , 1945 ; Dunkle and Hibbard, 1946 ; Nursall, 1999 ; Cronin and Shimada, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Njoerdichthys dyckerhoffi gen. et sp. nov. (Pycnodontiformes, lower Turonian) northward migration caused by the Cretaceous Thermal Maximum

Cawley

Lehmann

Wiese

et al. 2020

Cretaceous Research

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“…Order Pycnodontiformes Berg, 1940 Family Pycnodontidae Agassiz, 1833 Genus Micropycnodon Hibbard and Graffham, 1945 Micropycnodon kansasensis (Hibbard and Graffham, 1941) Referred material. FHSM VP-17495, one tooth (Fig.…”

Section: Class Osteichthyes Subclass Actinopterygii Superorder Neoptementioning

confidence: 99%

Marine vertebrates from the Hartland Shale (Upper Cretaceous: Upper Cenomanian) in southeastern Colorado, USA

Nagrodski

Shimada

Schumacher

2012

Cretaceous Research

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The Hartland Shale Member of the Greenhorn Limestone was deposited in the middle of the Late Cretaceous Western Interior Seaway of North America. Rock samples rich in micro-vertebrate fossils were collected from the lower part of the Hartland Shale (ca. 94.6 Ma: early Late Cenomanian) in southeastern Colorado, USA. Through acid treatment of the rock samples, 25 marine vertebrate taxa are identified including chondrichthyans, osteichthyans, and a reptile. Chondrichthyans are represented by seven species: Ptychodus anonymus, Squalicorax curvatus, Carcharias saskatchewanensis, Archaeolamna kopingensis, Cretoxyrhina mantelli, Cretomanta canadensis, and Rhinobatos incertus. Osteichthyan fishes consist of 17 taxa: Micropycnodon kansasensis, cf. Palaeobalistum sp., Caturidae indet., Protosphyraena sp., Plethodidae indet., Elopopsis sp., Pachyrhizodus minimus, cf. Pachyrhizodus sp., Albulidae indet., Cimolichthys nepaholica, Enchodus cf. E. gladiolus, E. cf. E. shumardi, Apateodus sp., and four unidentified teleosts. The only reptilian recognized is the small aquatic lizard Coniasaurus crassidens (Dolichosauridae). The taxonomic composition of the Hartland Shale fauna is similar overall to the extensively sampled, underlying mid-Cenomanian Lincoln Limestone fauna in Colorado and Kansas, although the occurrence of Apateodus and Cimolichthys from the Hartland Shale is notable as they represent geologically the oldest record for the two genera. The vertebrates identified are mostly carnivores that include piscivorous and durophagous forms, providing new insights into the trophic structure of the palaeocommunity.

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“…south and M mi. east of Paradise, Russell Co., Kansas; collected by Ernest Streaker 1938. Micropycnodon Hibbard and Graffham 1945 Syn. Pycnomicrodon Hibbard and Gralfliam 1941 Micropycnodon kansasensis (Hibbard and Graffham 1941) (Type-species) KUVP 1019 Pycnomicrodon kansasensis sp.…”

Section: Coelodus Meckel 1856mentioning

confidence: 99%

Type and figured specimens of fossil vertebrates in the collection of the University of Kansas Museum of Natural History / by H.-P. Schultze ... [et al.].

Schultze¹

1982

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Micropycnodon, New Name for Pycnomicrodon Hibbard and Graffham Not Hay

Cited by 10 publications

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Njoerdichthys dyckerhoffi gen. et sp. nov. (Pycnodontiformes, lower Turonian) northward migration caused by the Cretaceous Thermal Maximum

Njoerdichthys dyckerhoffi gen. et sp. nov. (Pycnodontiformes, lower Turonian) northward migration caused by the Cretaceous Thermal Maximum

Marine vertebrates from the Hartland Shale (Upper Cretaceous: Upper Cenomanian) in southeastern Colorado, USA

Type and figured specimens of fossil vertebrates in the collection of the University of Kansas Museum of Natural History / by H.-P. Schultze ... [et al.].

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