Discontinuous, asymmetric and irregular colour patterns in Silurian oncocerids (Nautiloidea) with cyrtoconic shells

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F20%3A00000219" target="_blank" >RIV/00025798:_____/20:00000219 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00023272:_____/20:10134956

Výsledek na webu

<a href="http://www.geology.cz/bulletin/contents/art1767" target="_blank" >http://www.geology.cz/bulletin/contents/art1767</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3140/bull.geosci.1767" target="_blank" >10.3140/bull.geosci.1767</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Discontinuous, asymmetric and irregular colour patterns in Silurian oncocerids (Nautiloidea) with cyrtoconic shells

Popis výsledku v původním jazyce

The colour pattern is a conspicuous character of nautiloid shells. Better understanding to its evolution and possible function is limited by the rarity of preservation. The majority of colour patterns are preserved in demersal late Silurian breviconic oncocerids, while in other cephalopod orders and shell forms, it is limited or unknown. The colour pattern of late Silurian oncocerids (Oonoceratidae Flower, 1942 and Oocerinidae Teichert, 1939) possessing cyrtoconic and slightly curved shells is documented in nine species from Bohemia belonging to five genera. The cyrtocones Richardsonoceras Foerste, 1933 and Oonoceras Hyatt, 1884 exhibit slightly irregular oblique zig-zag patterns, which may be disrupted and may pass into irregular patches of dark pigment. By contrast, the colour pattern in Oocerina Foerste, 1926, possessing similar shell shape to Oonoceras, consists of narrow, transversal, slightly undulated bands. The short and very slightly curved shell of Chromatoceras gen. nov. displays bilaterally asymmetrical irregular bands or, as in the type species, irregular, asymmetrical, strongly discontinuous colouration. Distinct changes of patterning throughout ontogeny arc documented herein in oncocerids, including narrowing of bands, irregular juvenile colouration passing into zig-zag bands and ventrally disappearing colouration in adult shell. Bilaterally asymmetric and irregular pattern, for the first time documented in nautiloids, appeared in probably more demersal cephalopods. The asymmetrical pattern exhibits high intraspecific variation unknown in other nautiloids. All studied oncocerids likely inhabited euphotic zone and the primary function of the colour patterns is camouflage.

Název v anglickém jazyce

Discontinuous, asymmetric and irregular colour patterns in Silurian oncocerids (Nautiloidea) with cyrtoconic shells

Popis výsledku anglicky

The colour pattern is a conspicuous character of nautiloid shells. Better understanding to its evolution and possible function is limited by the rarity of preservation. The majority of colour patterns are preserved in demersal late Silurian breviconic oncocerids, while in other cephalopod orders and shell forms, it is limited or unknown. The colour pattern of late Silurian oncocerids (Oonoceratidae Flower, 1942 and Oocerinidae Teichert, 1939) possessing cyrtoconic and slightly curved shells is documented in nine species from Bohemia belonging to five genera. The cyrtocones Richardsonoceras Foerste, 1933 and Oonoceras Hyatt, 1884 exhibit slightly irregular oblique zig-zag patterns, which may be disrupted and may pass into irregular patches of dark pigment. By contrast, the colour pattern in Oocerina Foerste, 1926, possessing similar shell shape to Oonoceras, consists of narrow, transversal, slightly undulated bands. The short and very slightly curved shell of Chromatoceras gen. nov. displays bilaterally asymmetrical irregular bands or, as in the type species, irregular, asymmetrical, strongly discontinuous colouration. Distinct changes of patterning throughout ontogeny arc documented herein in oncocerids, including narrowing of bands, irregular juvenile colouration passing into zig-zag bands and ventrally disappearing colouration in adult shell. Bilaterally asymmetric and irregular pattern, for the first time documented in nautiloids, appeared in probably more demersal cephalopods. The asymmetrical pattern exhibits high intraspecific variation unknown in other nautiloids. All studied oncocerids likely inhabited euphotic zone and the primary function of the colour patterns is camouflage.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA17-06700S" target="_blank" >GA17-06700S: Přídolí v pražské synformě - návrh na chronostratigrafické rozdělení</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název periodika

Bulletin of Geosciences

ISSN

1214-1119

e-ISSN

—

Svazek periodika

95

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

CZ - Česká republika

Počet stran výsledku

35

Strana od-do

333-367

Kód UT WoS článku

000557545000005

EID výsledku v databázi Scopus

2-s2.0-85089425737