Translator Disclaimer
1 September 2008 A Redescription of the Anatomy of the Late Devonian Spodichthys Buetleri Jarvik, 1985 (Sarcopterygii, Tetrapodomorpha) from East Greenland
Author Affiliations +
Abstract

The tetrapodomorph fish Spodichthys buetleri from the Upper Devonian of East Greenland is redescribed from computed tomography scans of material originally studied by Erik Jarvik. A wealth of new anatomical data was revealed by scanning the nearly perfectly three-dimensional specimens, including detailed information on the shape of the brain cavity and the internal structure of the lower jaws. Spodichthys displays an interesting mix of generalized “osteolepidid,” or primitive tetrapodomorph, and tristichopterid features. Derived characters shared by Spodichthys, tristichopterids and (Panderichthys Tetrapoda) include the loss of cosmine, a small kite-shaped parasymphysial plate, and a long commissural lamina of the entopterygoid. The presence of an extratemporal lateral to the tabular and a single fang position on the posterior coronoid and ectopterygoid are examples of basal tetrapodomorph characters retained in Spodichthys. Spodichthys is unique in having coronoid fangs positioned lateral to the corresponding replacement pit rather than having an anterior-posterior alternation between developed fang and replacement pit, which is the normal tetrapodomorph condition. Jarvik's original conclusion that Spodichthys is closely related to the tristichopterids is confirmed by a phylogenetic analysis, which places Spodichthys as the sister taxon of the Tristichopteridae.

Daniel Snitting "A Redescription of the Anatomy of the Late Devonian Spodichthys Buetleri Jarvik, 1985 (Sarcopterygii, Tetrapodomorpha) from East Greenland," Journal of Vertebrate Paleontology 28(3), 637-655, (1 September 2008). https://doi.org/10.1671/0272-4634(2008)28[637:AROTAO]2.0.CO;2
Accepted: 13 February 2008; Published: 1 September 2008
JOURNAL ARTICLE
19 PAGES


SHARE
ARTICLE IMPACT
RIGHTS & PERMISSIONS
Get copyright permission
Back to Top