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Metacamarella balclatchiensis
Taxonomy
Metacamarella balcletchiensis was named by Davidson (1883).
Synonymy list
No taxonomic opinions are available
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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.
†Metacamarella balclatchiensis Davidson 1883
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. R. C. Reed 1917 | Shell elongated, oval to subpentagonal, widest across middle, somewhat truncated in front, strongly biconvex. Pedicle-valve rounded, convex, more or less inflated, with median group of 6-8 low rounded closely-placed longitudinal plications forming broad weak flattened fold, arising at about half the length of the valve and most developed close to anterior margin, scarcely elevated above smooth lateral portions ; beak high, pointed, incurved, rising well above arched hinge-line, with a weak ridge on each side curving off to define imperfectly a slightly depressed false area ; large open triangular delthyriuni below beak. Interior of valve with small spondylium and very short median septum. Brachial valve with lower beak and slightly excavated shoulders and weaker flattened median fold composed of 5-7 longitudinal plications like those on opposite valve ; lateral portions of valve smooth. Interior of valve with pair of long parallel closely placed septa extending more than one-third length of valve ; crura long, stout, recurved, diverging at about 60°, close to hinge-line ; posterior adductors large, oval, lying against septa and extending to their extremities ; anterior adductors small, deep, subtriangular, situated immediately in front of posterior pair near middle line. Shell substance thick, fibrous, and externally punctate. | |
| A. Williams 1962 | Large Metacamerella subpentagonal in outline, due to the development of vertically plunging postero-lateral margins, "false interareas," for just over one-half of the length of the shell; brachial valve just longer than wide and over one-quarter as deep as wide, with a low, broad, antero-median fold and strongly convex, antero-lateral areas; at about 13 mm. anterior to the dorsal umbo between 5 and 7 flat-topped costae with a wave-length of 3 ram. developed along the anterior margin; crural supporting plates subparallel, extending anteriorly for about two-fifths of the length of the valve, containing, towards the front, secondary ridges associated with a large adductor muscle-field impressed anterior and lateral to the supporting plates. |