Two new Actinopterygii (Vertebrata, Osteichthyes) with cosmine from the Bear Gulch Limestone (Heath Fm., Serpukhovian, Mississippian) of Montana USA

  title={Two new Actinopterygii (Vertebrata, Osteichthyes) with cosmine from the Bear Gulch Limestone (Heath Fm., Serpukhovian, Mississippian) of Montana USA},
  author={Eileen D. Grogan and Richard Lund},
ABSTRACT. The osteology and histology of two new actinopterygians, Paphosiscus circulocaudus new genus and species, and P. scalmocristus new species, are described from the Upper Mississippian Serpukhovian Bear Gulch Member of the Heath Formation of Montana (USA). These small fish (ca 50–58mm standard length) exhibit head bones and scales with cosmine, the first report of this in any actinopterygian. Other features of Paphosiscus are dorsal, anal and caudal fin margins round posteriorly… 

Family-group names of fossil fishes

The main goal of the list is to contribute to the usage of the correct family-group names for fossil fishes with a uniform spelling and to list the author(s) and date of those names.



Cranial morphology of the Silurian sarcopterygian Guiyu oneiros (Gnathostomata: Osteichthyes)

The skull roof bone pattern in the Guiyu clade that comprises Psarolepis and Achoania is restored, for the first time, and the large attachment area of the basicranial muscle indicates the presence of a well-developed intracranial joint in GuiyU.

Styracopterid (Actinopterygii) ontogeny and the multiple origins of post-Hangenberg deep-bodied fishes

It is shown that styracopterid growth series show that trunk depth increased during maturation, mirroring the shape variation observed among the Eurynotiformes, and implies that platysomoids are polyphyletic: deep-bodied and/or durophagous fishes evolved multiple times following the Hangenberg event.

A primitive fish provides key characters bearing on deep osteichthyan phylogeny

This 405-million-year-old fish from the Lower Devonian of Yunnan (China) demonstrates that cosmine in many fossil sarcopterygians arose step by step through the acquisition of a pore–canal network followed by the subsequently developed ability to resorb previous generations of odontodes and enamel.

A Revision of the Middle Triassic Scanilepiform Fish Fukangichthys longidorsalis from Xinjiang, China, with Comments on the Phylogeny of the Actinopteri

Results of a phylogenetic analysis confirmed Fukangichthys as a scanilepiform within the Neopterygii, and provided new insights into the evolution of early actinopteran fishes.

The oldest articulated osteichthyan reveals mosaic gnathostome characters

The discovery of an exceptionally preserved primitive fish from the Ludlow of Yunnan, China, that represents the oldest near-complete gnathostome (jawed vertebrate) offers insights into the origin and early divergence of osteichthyans, and indicates that the minimum date for the actinopterygian–sarcoperygian split was no later than 419 million years ago.

A new scanilepiform from the Lower Triassic of northern Gansu Province, China, and phylogenetic relationships of non‐teleostean Actinopterygii

A new scanilepiform, Beishanichthys brevicaudalis gen. et sp. nov., is named and described based on fossils from the Lower Triassic lake deposits exposed in Beishan area, Gansu Province, China. The

XVII.—The Actinopterygian Fishes from the Lower Carboniferous of Glencartholm, Eskdale, Dumfriesshire

The new descriptions in this work are not intended to be exhaustive accounts of all that is known of these fishes, but merely to serve as a supplement and summary to the excellent descriptions of Traquair.

A review of cosmine: its structure, development, and relationship to other forms of the dermal skeleton in osteichthyans

This study examines the different arrangements of tissues that cosmine exhibits in dipnoans and “rhipidistians” and shows that a continuum of developmental processes existed between cosmine sensu stricto and other configurations of the dermal skeleton, such as those in coelacanths and actinopterygians.

Origin and evolution of the integumentary skeleton in non‐tetrapod vertebrates

The novelty of the new scenario of integumentary skeletal evolution resides in the demonstration that elasmodine, the main component of elasmoid scales, is odontogenic in origin, and it is proposed that el asmodine is a form of lamellar dentine.


The articular relations with the chondrocranium of the upper and lower jaw-cartilages and the hyomandibular, as typified in Ceratodis, in Squalus, and in Notidanus, are in themselves of course