Scale morphology and squamation of the Late Silurian osteichthyan Andreolepis from Gotland, Sweden
2012 (English)In: Historical Biology, ISSN 0891-2963, Vol. 24, no 4, 411-423 p.Article in journal (Refereed) Published
The origin of osteichthyans (bony fishes and tetrapods) dates back to the Late Silurian, but the early evolution of the group is poorly understood. Andreolepis is one of the oldest known osteichthyans, but exclusively documented by detached and fragmentary dermal microremains. A large data-set of Andreolepis scales from the Silurian of Gotland has been used to explore the scale morphology on different parts of the body. Landmark-based geometric morphometrics together with comparative anatomy and functional morphology has allowed 10 morphotypes to be identified and incorporated into a squamation model, in which scales are allocated to anterior-mid lateral flank scales, posterior lateral flank scales, caudal peduncle scales, pectoral peduncle scales, dorsal flank scales, dorsal fulcral scales, caudal fulcral scales, ventral flank scales, medioventral scales and cranial scales. The scale morphology and squamation pattern ofAndreolepis may be primitive for the Osteichthyes and thus informative about the acquisition of the osteichthyan body plan.
Place, publisher, year, edition, pages
2012. Vol. 24, no 4, 411-423 p.
Late Silurian, Osteichthyan, Andreolepis, scale, squamation, morphometrics
Research subject Biology with specialization in Evolutionary Organismal Biology
IdentifiersURN: urn:nbn:se:uu:diva-190930OAI: oai:DiVA.org:uu-190930DiVA: diva2:584727
12th International Symposium on Early Vertebrates/Lower Vertebrates