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Mjoesina rugata
Taxonomy
Mjoesina rugata was named by Williams (1962). Its type specimen is BB.15230-1, a valve (Internal and external mould of pedicle valve), and it is a 3D body fossil.
Subspecies
Synonymy list
| Year | Name and author |
|---|---|
| 1962 | Mjoesina rugata Williams pp. 206 - 207 figs. Pl. XX, figs. 19-22, 25-29 |
| 2014 | Mjoesina rugata Candela and Harper pp. Supplement 1 |
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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.
†Mjoesina rugata Williams 1962
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†Mjoesina rugata plana Williams 1962
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. Williams 1962 | Subquadrate Mjoesina about four-fifths as long as broad, with an evenly convex pedicle valve and a gently concave brachial valve becoming sharply geniculate dorsally at 6 mm. from the umbo and commonly bearing a low, narrow, median fold; costellae cancellated, commonly 5 or 6 per millimetre antero-medianly, and grouped into sectors over 1 mm. wide by thicker costae and costellae, posterolateral areas corrugated by short rugae, with a wave-length just over 1 mm., and commonly arranged as 3 pairs on either side of the umbo more or less normal to the hinge-line; ventral muscle-scar about onethird as long as the pedicle valve, and slightly wider than long; socket plates strong, curved, and widely divergent, each commonly crenulated by 4 denticles. |