Nevertheless, the new material has not provided enough evidence to clarify the interrelationships of Karksiodus with other chondrichthyans
However, it was immediately apparent that they represented an undescribed egg capsule, being unlike any other egg capsule yet described for a chondrichthyan
Abstract: A suite of fossils collected from the Warsaw Formation (Mississippian) of Missouri includes brachiopods, bryozoans, cnidarians, poriferans, echinoderms, and chondrichthyan
Part of a large chondrichthyan
fin spine from Middle Pennsylvanian deposits of Illinois was described and named Xystracanthus mirabilis by St.
DNAC = Description of New Australian Chondrichthyans
Articulated specimens of thelodonts and possible chondrichthyans
were collected from a single locality in the type section of the graptolitic Cape Phillips Formation on the northeast coast of Cornwallis Island where they occur throughout a 2 m interval of thinly-bedded argillaceous limestone (GSC locality C-26661; UTM Zone 15X, 457500E, 8393250N).
The use of DNA barcoding, the sequencing of a ca 655 bp region of the mitochondrial cytochrome c oxidase I (COI) gene, has proven to be highly effective at discriminating between chondrichthyan
species (Ward et al.
Other groups of vertebrates, such as psammosteids, placoderms, acanthodians and porolepiforms, predominate in those assemblages while the chondrichthyans
are occasional accessory elements.
Life histories, population dynamics, and extinction risks in Chondrichthyans
Gross 1973; Schultze 1977; Derycke & Chancogne-Weber 1995; Beznosov 2001, 2005) and extant chondrichthyans
(Reif 1985), and has been explained as imprints of epidermal cells (Gross 1973) or as a reflection of the composition of the underlying tissue (e.
were fairly rare but present in all six samples.
canicula, urochordate and chondrichthyan
species were also observed in stomachs and were classified as accidental prey items.
Eighteen of these fins failed to yield a chondrichthyan
sequence, but the remaining 193 fins could be identified as comprising 27 different species of sharks and rays.
New thelodont (Agnatha) and possible chondrichthyan
(Gnathostomata) taxa established in the Silurian and Lower Devonian of the Canadian Arctic Archipelago.
The polygonal ultrasculpture has also been described on the true scales of a chondrichthyan
Kannathalepis milleri (in Marss & Gagnier 2001, figs.