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Lyropecten modulatus
Taxonomy
Pecten (Lyropecten) modulatus was named by Hertlein (1925). Its type specimen is LSJU (no number), a shell, and it is a 3D body fossil.
It was recombined as Lyropecten modulatus by Moore (1984) and Smith (1991).
It was recombined as Lyropecten modulatus by Moore (1984) and Smith (1991).
Sister species lacking formal opinion data
Synonymy list
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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.
†Lyropecten modulatus Hertlein 1925
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| L. G. Hertlein 1925 | Shell moderately convex, fairly heavy, showing slight areas of constricted growth. Right valve ornamented by about 14 longitudinally sculptured radiating ribs, which are rounded in the earlier part of the shell, but which, toward the ventral margin, show a tendency to become flattened; interspaces of varying width but all narrower than the ribs, all containing a small midrib; anterior and posterior margins of shell ornamented by fine longitudinal riblets; ears unequal, the anterior ear large, with large byssal notch and sculpture consisting of about seven well defined radial riblets and concentric growth lines, the left ear small in comparison with the large right, its posterior edge sloping down almost vertically to the margin of shell, the surface of the ear ornamented by about eight or more radiating riblets over which are superimposed fine longitudinal and concentric lines. Altitude 58 mm. ; longitude 60 mm. ; diameter of right valve approximately 14 mm. ; apical angle, right valve approximately 92°. |