A NEW COELACANTH FROM THE MIDDLE DEVONIAN OF LATVIA

We describe a new species of coelacanth, Miguashaia grossi sp. nov., recognized from isolated cranial, shoulder girdle bones and scales from the Upper Givetian Gauja and Lode Formations of two Latvian localities. This coelacanth, together with comparisons with other Devonian coelacanths, allows a mo...

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Bibliographic Details
Published in:Journal of vertebrate paleontology 2000-06, Vol.20 (2), p.243-252
Main Authors: FOREY, PETER L, AHLBERG, PER E, LUKŠEVIČS, ERVINS, ZUPINŠ, IVARS
Format: Article
Language:English
Subjects:
Bones
Clavicle
Fossils
Girdles
Jaw
Palate
Rum
Teeth
Vertebrate paleontology
Vertebrates
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Summary:We describe a new species of coelacanth, Miguashaia grossi sp. nov., recognized from isolated cranial, shoulder girdle bones and scales from the Upper Givetian Gauja and Lode Formations of two Latvian localities. This coelacanth, together with comparisons with other Devonian coelacanths, allows a more precise description of the plesiomorphic condition of the lower jaw, shoulder girdle, and palate. These plesiomorphic conditions are as follows. The dentary is shallow throughout, the articular-retroarticular is deep posteriorly where it is developed as two processes—one for the symplectic articulation and the other demarcating the posteroventral angle of the jaw. In the shoulder girdle plesiomorphic attributes include the large triangular clavicle, a cleithrum which is directed anterodorsally and possibly a large and polygonal extracleithrum. In the palate the pterygoid shows a dorsal process of unknown function mid-way along the dorsal margin and this is also a plesiomorphic feature of coelacanths.
ISSN:0272-4634
1937-2809
1937-2809
DOI:10.1671/0272-4634%282000%29020%5B0243%3AANCFTM%5D2.0.CO%3B2