
Per Ahlberg
Professor emeritus

The ontogeny of Ellipsocephalus (Trilobita) and systematic position of Ellipsocephalidae
Författare
Summary, in English
Laibl, L., Fatka, O., Budil, P., Ahlberg, P., Szabad, M., Voka, V. & Kozak, V., 24.3.2015. The ontogeny of Ellipsocephalus (Trilobita) and systematic position of Ellipsocephalidae. Alcheringa 39, 477-487. ISSN 0311-5518.Well-preserved early holaspid stages of the Cambrian Series 3 trilobites Ellipsocephalus hoffi (Schlotheim, 1823) and Ellipsocephalus polytomus Linnarsson, 1877 have been discovered in the Pibram-Jince Basin (Czech Republic) and Jamtland (Sweden), respectively. Both species show remarkable morphological changes during late ontogeny. The earliest holaspides share long genal spines, and long macrospines on the second thoracic segment. Whereas macrospines disappear abruptly in later stages, genal spines are progressively shortened. Consequently, the ontogeny of trilobites of Ellipsocephalidae is revised. The morphology of early meraspid cranidia and ontogenetic patterns in the disappearance of macrospines suggest that this family is closely related to members of Redlichiida rather than Ptychopariida.
Avdelning/ar
- Berggrundsgeologi
Publiceringsår
2015
Språk
Engelska
Sidor
477-487
Publikation/Tidskrift/Serie
Alcheringa
Volym
39
Issue
4
Dokumenttyp
Artikel i tidskrift
Förlag
Taylor & Francis
Ämne
- Geology
Nyckelord
- Ellipsocephalidae
- Trilobita
- ontogeny
- Cambrian
- Pibram-Jince Basin
- Jamtland
Aktiv
Published
ISBN/ISSN/Övrigt
- ISSN: 0311-5518