TY - JOUR
T1 - The ontogeny of Ellipsocephalus (Trilobita) and systematic position of Ellipsocephalidae
AU - Laibl, Lukas
AU - Fatka, Oldrich
AU - Budil, Petr
AU - Ahlberg, Per
AU - Szabad, Michal
AU - Vokac, Vaclav
AU - Kozak, Vladislav
PY - 2015
Y1 - 2015
N2 - 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.
AB - 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.
KW - Ellipsocephalidae
KW - Trilobita
KW - ontogeny
KW - Cambrian
KW - Pibram-Jince Basin
KW - Jamtland
UR - https://www.scopus.com/pages/publications/84944177321
U2 - 10.1080/03115518.2015.1034968
DO - 10.1080/03115518.2015.1034968
M3 - Article
SN - 0311-5518
VL - 39
SP - 477
EP - 487
JO - Alcheringa
JF - Alcheringa
IS - 4
ER -