Post-embryonic development of Fritzolenellus suggests the ancestral morphology of the early developmental stages in Trilobita

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F21%3A00525183" target="_blank" >RIV/67985831:_____/21:00525183 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/21:10438489

Result on the web

<a href="https://onlinelibrary.wiley.com/doi/10.1002/spp2.1324" target="_blank" >https://onlinelibrary.wiley.com/doi/10.1002/spp2.1324</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/spp2.1324" target="_blank" >10.1002/spp2.1324</a>

Result language

angličtina

Original language name

Post-embryonic development of Fritzolenellus suggests the ancestral morphology of the early developmental stages in Trilobita

Original language description

Trilobite development has been intensively explored during the past decades, but information on ancestral character combinations in the early developmental stages of trilobites remains unknown. Trilobites of the superfamily Olenelloidea are one of the earliest diverging groups. Study of their development coupled with the development of other early diverging trilobite groups can provide information on the ancestral morphology of trilobite early stages. Herein we describe numerous well-preserved specimens of the olenelloid trilobite Fritzolenellus lapworthi. The earliest stages have circular cephala bearing intergenal spines and lacking genal spines. During subsequent development, morphological changes involve the modification of the cephalic shape from circular to semicircular, expansion of the frontal glabellar lobe, gradual shortening of intergenal spines and origin and prolongation of genal spines. Trunk development of Fritzolenellus suggests that macropleurae and macrospine development are two independent processes and that the origin of the opisthotrunk is linked with the onset of phase 5 of cephalic development. The morphology of the early developmental stages of Fritzolenellus and of some related taxa differs in many aspects from the morphology of equivalent stages of some other members of Olenelloidea. Consequently, two basic morphotypes are recognized during the early development of Olenelloidea: the Fritzolenellus and the Olenellus morphotypes. Comparison with Fallotaspidoidea and Redlichiina indicates that early developmental stages of these taxa share character combinations that are typical for the Fritzolenellus morphotype. Such a comparison suggests that characters defining the Fritzolenellus morphotype are ancestral for Trilobita. The Olenellus morphotype is probably a derived condition within Olenelloidea and might be related to predator deterrence.

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

2021

Confidentiality

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

Name of the periodical

Papers in Palaeontology

ISSN

2056-2799

e-ISSN

2056-2802

Volume of the periodical

7

Issue of the periodical within the volume

2

Country of publishing house

GB - UNITED KINGDOM

Number of pages

21

Pages from-to

839-859

UT code for WoS article

000641879000010

EID of the result in the Scopus database

2-s2.0-85086243838