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Mellopegma schizocheras
Taxonomy
Mellopegma schizocheras was named by Vendrasco et al. (2011). Its type specimen is CPC 40456, a shell, and it is a 3D body fossil. Its type locality is Just above Bronco Stromatolith Bed c. 200 m ENE along strike from section 415, which is in a Floran sand shoal lime mudstone in the Gowers Formation of Australia.
Synonymy list
| Year | Name and author |
|---|---|
| 2011 | Mellopegma schizocheras Vendrasco et al. pp. 11A9-15 figs. 7.1-7.2, 8-9 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Mellopegma schizocheras Vendrasco et al. 2011
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. J. Vendrasco et al. 2011 | Shell elongate, highly laterally compressed, typically with faint comarginal rugae. Dorsal supra-apical margin gently convex. Sub-apical margin concave, terminating in short shelf. Prismatic shell microstructure occasionally preserved as polygons on internal moulds near the anterior and posterior aperture margin.
Elongate, laterally compressed univalve with faint internal ridges on the internal mould. The internal ridges roughly parallel the growth lines and fade out near the anterior and posterior margins. These ridges vary in this species in depth, spacing, and number. Dorsal margin broadly convex, sub-apical margin concave with extended shelf. Tubercles present over much of surface of some internal moulds, but typically most common along the dorsal margin, including the apex, and along the internal ridges. Polygonal texture on sub-apical lip of many specimens, probably representing prismatic shell microstructure of outer shell layer. Angular texture with imprints of parallelogram-shaped tablets occur on all other regions of internal moulds, representing highly organized version of calcitic semi-nacre. The angular imprints are visible in various states of preservation on all specimens examined. Many specimens had an internal thickening parallel to, and just below, dorsum (Figure 8.5, 8.7, 8.21). |