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Zygospira matutina
Taxonomy
Zygospira matutina was named by Cooper (1956) [Zygospira ? matutina]. Its type specimen is USNM 117261, a shell, and it is a 3D body fossil. Its type locality is Hills east of Leeds, which is in an Ashbyan carbonate limestone in the Little Oak Formation of Alabama.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1956 | Zygospira matutina Cooper p. 672 figs. Plate 141, B, figures 13-17 |
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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.
†Zygospira matutina Cooper 1956
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. A. Cooper 1956 | Shell small, subrhomboidal in outline; greatest width at the middle where prominent shoulders are formed by the union of the posterolateral and anterolateral margins; apical angle about 80°. Anterior commissure strongly and broadly sulcate ; surface costellate, costellae subdued and delicate, extending from beak to anterior margin.
Pedicle valve gently convex in lateral profile ; narrowly convex in the median region in anterior profile and with long, flat, only moderately steep slopes. Beak long ; umbo narrowly convex ; median region narrowly convex ; anterior region somewhat narrowly folded, and fold moderately elevated and with moderately steep slopes. Brachial valve gently convex in lateral profile, just perceptibly convex in anterior profile and with a slight depression in the median region. Umbo narrowly sulcate, the sulcus deepening and widening to the anterior margin where it occupies more than half the width. Flanks gently convex. Interior unknown. |