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Hemipolygona
Taxonomy
Hemipolygona was named by Rovereto (1889). Its type is Latirus armatus.
It was assigned to Peristerniinae by Vermeij and Snyder (2006) and Harzhauser et al. (2009).
It was assigned to Peristerniinae by Vermeij and Snyder (2006) and Harzhauser et al. (2009).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1873 | Chascax Watson |
| 1889 | Hemipolygona Rovereto |
| 2006 | Hemipolygona Vermeij and Snyder |
| 2009 | Hemipolygona Harzhauser et al. p. 351 |
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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.
G. †Hemipolygona Rovereto 1889
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Hemipolygona distincta Adams 1855
†Hemipolygona erinaceus Peyrot 1928
Hemipolygona mcgintyi Pilsbry 1939
†Hemipolygona nosali Lyons 1991
†Hemipolygona stephensae Lyons 1991
†Hemipolygona taurus Olsson 1922
Invalid names: Chascax Watson 1873 [replaced]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| G. J. Vermeij and M. A. Snyder 2006 | Shell medium to large, maximum length 30 to 109 mm, fusiform, with strongly constricted base; siphonal protuberance straight, moderately long; spire whorls stepped; last whorl with deeply concave subsutural sector, crossed by subdued axial ribs; central sector of last whorl with twelve or fewer prominent, high, rounded axial ribs, and high spiral cords that usually form nodes at prominent shoulder angulation, central cord, and sometimes other points of intersection with axial ribs; outer lip of adult usually sharp, strongly to weakly ornamented with paired crenations on central sector; lip planar to weakly convex, with abapical and adapical sinuses absent or very poorly developed; inner side of outer lip with beaded lirae, not forming denticles; inner lip with several abapical folds and, in adults, a very weakly developed parietal nodule; pseudoumbilicus usually present. |