Colour patterns in Palaeozoic orthoceratoid cephalopods-diversification of striping

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F25%3A10169882" target="_blank" >RIV/00025798:_____/25:10169882 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.3140/bull.geosci.1956" target="_blank" >https://doi.org/10.3140/bull.geosci.1956</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3140/bull.geosci.1956" target="_blank" >10.3140/bull.geosci.1956</a>

Result language

angličtina

Original language name

Colour patterns in Palaeozoic orthoceratoid cephalopods-diversification of striping

Original language description

The evolution of shell colouration in Palaeozoic cephalopods is still poorly understood. To date, thirtysix species of orthoceratoids have been described that display colour patterns on their shell. Thirteen species are newly added herein or re described from the Ludlow of Bohemia and two from the Mississippian of Belgium. The colour pattern is best documented in pseudorthoceratids. Some gaps in the fossil record still exist and seemingly separate periods dominated by specific types of shell colour patterns. Ordovician pseudorthoceratids have uniform, regular and evenly spaced longitudinal stripes. A similar but less regular type of colouration also occurs in Silurian pseudorthoceratids-rhythmised, irregular, interrupted and anastomosing colour stripes. After a gap in the Early Devonian, younger pseudorthoceratids possess a chevron pattern. A difference in the colour pattern in hatchlings and later growth stages is documented in the Carboniferous Pseudocyrtoceras. The restriction of colouration to the dorsal side of the shell in Devonian and Carboniferous pseudorthoceratids, which was previously interpreted as reflecting horizontal biological orientation of the shell and countershading, is questioned. The adaptive control and protective function of the shell colour patterns are indicated by the diversification of colour patterns in the Silurian, the emergence of the chevron pattern in the Devonian and early Carboniferous, the relationship between colour patterns and shell shape, the colour pattern polymorphism, and the ontogenetic changes in colouration. The pseudorthoceratid Pellucidoceras gen. nov. is established herein. Its type species, the Silurian P. decipiens, shows an intraspecific variability in the number, width, and spacing of stripes, and possibly represents case of colour pattern polymorphism. center dot Key words: Cephalopoda, Orthoceratida, shell colouration, palaeoecology, Silurian, new taxa.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10506 - Paleontology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Bulletin of Geosciences

ISSN

1214-1119

e-ISSN

1802-8225

Volume of the periodical

100

Issue of the periodical within the volume

4

Country of publishing house

CZ - CZECH REPUBLIC

Number of pages

45

Pages from-to

739-783

UT code for WoS article

001685853600020

EID of the result in the Scopus database

2-s2.0-105030479147