Vascularization and odontode structure of a dorsal ridge spine of Romundina stellina Orvig 1975.

ABSTRACT: There are two types of dermal skeletons in jawed vertebrates: placoderms and osteichthyans carry large bony plates (macromery), whereas chondrichthyans and acanthodians are covered by small scales (micromery). Fin spines are one of the last large dermal structures found on micromeric taxa and offer a potential source of histology and morphology that can be compared to those found on macromeric groups. Dermal fin spines offer a variety of morphology but aspects of their growth modes and homology are unclear. Here, we provide detailed descriptions of the microstructure and growth of a dorsal ridge spine from the acanthothoracid placoderm, Romundina stellina, using virtual three-dimensional paleohistological datasets. From these data we identify several layers of dentine ornamentation coverin

SUBMITTER: Jerve A 

PROVIDER: S-EPMC5744956 | biostudies-literature | 2017

REPOSITORIES: biostudies-literature