Silurian tarphycerid Discoceras (Cephalopoda, Nautiloidea): systematics, embryonic development and paleoecology

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F18%3A00000001" target="_blank" >RIV/00025798:_____/18:00000001 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00023272:_____/18:10133999

Výsledek na webu

<a href="http://dx.doi.org/10.1017/jpa.2017.122" target="_blank" >http://dx.doi.org/10.1017/jpa.2017.122</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1017/jpa.2017.122" target="_blank" >10.1017/jpa.2017.122</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Silurian tarphycerid Discoceras (Cephalopoda, Nautiloidea): systematics, embryonic development and paleoecology

Popis výsledku v původním jazyce

Tarphycerids were diverse and abundant in Ordovician marine faunas. Beginning at the Late Ordovician extinction, the diversity of tarphycerids declined throughout the Silurian, until their extinction in the latest Silurian. Two genera survived the Late Ordovician extinction: Trocholites Conrad, 1838 (from which Ophioceras Barrande, 1865 probably diverged) and Discoceras Barrande, 1867 (= Graftonoceras Foerste, 1925). Discoceras graftonense (Meek and Worthen, 1870), so far known from the US, China, and Australia, is recorded from the Silurian of Bohemia and Gotland. Discoceras stridsbergi n. sp., D. lindstroemi n. sp., and D. sp. indet. from the Wenlock of Gotland and D. amissus (Barrande, 1865) from the Llandovery of Bohemia are all endemic species probably derived from D. graftonense. The distribution of D. graftonense and the origin of four species of Discoceras in the latest Sheinwoodian and early Homerian represent the last diversification and dispersion of the Tarphycerida. No tarphycerid species originated after the mid-Homerian extinction (Mulde and Lundgreni events). Silurian Discoceras retained the morphology and habitats of their Ordovician ancestors. The hatching time and autecology of juveniles has remained unclear. Evidence from the material studied suggests that juveniles were planktonic in habit possessing a minute curved shell with few phragmocone chambers. Discoceras lindstroemi is exceptional owing to its heteromorphic planispiral shell with coiling that changed during ontogeny resulting in a changing aperture orientation and decreased maneuverability.

Název v anglickém jazyce

Silurian tarphycerid Discoceras (Cephalopoda, Nautiloidea): systematics, embryonic development and paleoecology

Popis výsledku anglicky

Tarphycerids were diverse and abundant in Ordovician marine faunas. Beginning at the Late Ordovician extinction, the diversity of tarphycerids declined throughout the Silurian, until their extinction in the latest Silurian. Two genera survived the Late Ordovician extinction: Trocholites Conrad, 1838 (from which Ophioceras Barrande, 1865 probably diverged) and Discoceras Barrande, 1867 (= Graftonoceras Foerste, 1925). Discoceras graftonense (Meek and Worthen, 1870), so far known from the US, China, and Australia, is recorded from the Silurian of Bohemia and Gotland. Discoceras stridsbergi n. sp., D. lindstroemi n. sp., and D. sp. indet. from the Wenlock of Gotland and D. amissus (Barrande, 1865) from the Llandovery of Bohemia are all endemic species probably derived from D. graftonense. The distribution of D. graftonense and the origin of four species of Discoceras in the latest Sheinwoodian and early Homerian represent the last diversification and dispersion of the Tarphycerida. No tarphycerid species originated after the mid-Homerian extinction (Mulde and Lundgreni events). Silurian Discoceras retained the morphology and habitats of their Ordovician ancestors. The hatching time and autecology of juveniles has remained unclear. Evidence from the material studied suggests that juveniles were planktonic in habit possessing a minute curved shell with few phragmocone chambers. Discoceras lindstroemi is exceptional owing to its heteromorphic planispiral shell with coiling that changed during ontogeny resulting in a changing aperture orientation and decreased maneuverability.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

<a href="/cs/project/GA14-16124S" target="_blank" >GA14-16124S: Zpřesnění chronostratigrafie spodního siluru: návrh nových mezinárodních stratotypů (GSSP) stupňů aeron a homer</a><br>

Návaznosti

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

Rok uplatnění

2018

Kód důvěrnosti údajů

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

Název periodika

Journal of Paleontology

ISSN

0022-3360

e-ISSN

—

Svazek periodika

92

Číslo periodika v rámci svazku

3

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

20

Strana od-do

412-431

Kód UT WoS článku

000431786600007

EID výsledku v databázi Scopus

2-s2.0-85045893764