Taxonomy of some Galeommatoidea (Mollusca, Bivalvia) associated with deep-sea echinoids: A reassessment of the bivalve genera Axinodon Verrill & Bush, 1898 and Kelliola Dall, 1899 with descriptions of new genera Syssitomya gen. nov. and Ptilomyax gen. nov.
Author
Oliver, P. Graham
text
European Journal of Taxonomy
2012
2012-04-25
12
1
24
journal article
21841
10.5852/ejt.2012.12
5217c4a1-a0dd-478e-bd0c-95df35bad69b
2118-9773
3857751
098E15C8-27DB-46C7-8A15-6394EE854B64
Genus
Axinodon
Verrill & Bush, 1898
Type
species
Axinodon ellipticus
Verrill & Bush, 1898
.
Diagnosis (based on shell characters alone)
Shell small, thin. Equivalve. Inequilateral, beaks behind the midline. Umbos prominent, beaks prosogyrate. Outline obliquely subcircular, distinctly expanded anteriorly. Sculpture of commarginal ridges. Hinge plate narrow, ligament deeply sunken on a groove running from under the beaks posteriorly. Right valve lacking any projecting teeth; left valve with a short, weak. marginal flange beneath the lunule. Isomyarian. Pallial line entire.