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Cucullaea (Idonearca) calabaza
Taxonomy
Cucullaea (Idonearca) calabaza was named by Anderson (1958). It is a 3D body fossil. Its type locality is CAS loc. 30536, Simi Hills, which is in a Cretaceous marine horizon in the Chatsworth Formation of California.
Sister species lacking formal opinion data
Arca gabrielis, C. acuticarinata, C. antarctica, C. australis, C. ceres, C. clathrata, C. contracta, C. egertonianus, C. favrei, C. gabrielis, C. jaworskii, C. kipandeensis, C. mailleana, C. matheroniana, C. minchiahamplonensis, C. ornata, C. rothi, C. royei, C. sheikhfadli, C. texta, C. vulgaris, C. wadei, C. waihaoensis, C. woodsi, C. coxi, C. fuegunensis, C. aalensis, C. powersi, C. rothi, C. waihaoensis, Idonearca aequilateralis, Idonearca glabra, Idonearca matheroni
Synonymy list
| Year | Name and author |
|---|---|
| 1958 | Cucullaea (Idonearca) calabaza Anderson p. 90 figs. Plate 70, figures 1, la |
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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.
†Cucullaea (Idonearca) calabaza Anderson 1958
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| F. M. Anderson 1958 | Shell is large, massive, somewhat trapezoidal in outline, as viewed from the side, though from the front or rear its inflated sides give it a rotund, almost spherical appearance. Umbones are broad and rounded, though truncated behind; apex of beak being nearly central, though relatively low, beak depressed above the ligamental area ; base of valves broadly rounded curving rapidly upward at anterior end, but meeting its border at nearly right angles ; surface of shell generally smooth, showing only fine concentric lines of growth ; at nearly uniform intervals interspersed with coarser threads or grooves, producing a wave-like surface unlike that of any other known species. Hinge is long and straight at top, but broadly arched beneath, set with normal cucullaeaid teeth, consisting of a short interval of vertical denticles near the middle, 8-10 in number, and long laterals at the ends, 3 or 4 in number, nearly parallel with hinge margin, or slightly inclined to front or rear. Holotype (C. A. S. Type Coll.) has the following dimensions: length, 102 mm; height, 90 mm; thickness of each valve, 48 mm ; giving the umbonal diameter of the shell a measure greater than its height. |