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Mastigospira intermedia
Taxonomy
Mastigospira intermedia was named by La Rocque (1949). Its type specimen is UMMP 23296, a shell, and it is a 3D body fossil. Its type locality is Lake Huron Beach, north of Rockport Quarry ½ miles N Alpena:Presque Isle Co, which is in an Eifelian carbonate limestone in the Rogers City Formation of Michigan.
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.
†Mastigospira intermedia La Rocque 1949
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. La Rocque 1949 | Shell tusk-shaped, uncoiled, gently curved, triangular in cross section on the outside, the three apices of the triangle gently rounded, with blunt winglike processes. Lip flaring widely at the base, less so at the upper angle. Base of lip having a deep but gently rounded notch with two spinelike processes at the base of the aperture. Upper angle of lip less produced than the two basal ones. Ornamentation of fine, crowded growth lines directed forward from the upper angle of the shell and curved backward on its basal face. Angles of the shell bluntly rounded, obscurely nodulose, the lower ones smooth except where crossed by the growth lines. Apical part of shell terminating abruptly in a convex surface, which suggests that the earliest part of the shell had been broken off at a point marked by a septum or plug. |