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Gastropoda - Cycloneritimorpha - Trachyspiridae

Synonymy list
YearName and author
1866Trachydomia Meek and Worthen
1889Platychilus Gemmellaro p. 118
1933Trachydoma Knight pp. 363 – 364
1960Trachydomia Knight et al. p. 277
1995Trachydomia Batten pp. 27 – 28
2002Trachydomia Sepkoski, Jr.
2007Trachydomia Nützel et al. p. 220
2016Trachydomia Nützel and Ketwetsuriya p. 502

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EubilateriaAx 1987
classGastropodaCuvier 1797

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.

J. B. Knight 1933Littoriniform gastropods with thick shell, moderately low spire and anomphalous base; volutions rapidly increasing in size, the body whorl forming most of the shell; sutures well marked, but not deep, a somewhat collarlike unornamented area just below the suture; plane of the aperture somewhat oblique; outer lip thin; columellar lip arcuate, thickened and with a well marked groove within; parietal inductura thick, flattened and extended in the plane of the aperture; a channel at the juncture of the outer lip with the parietal wall, probably excurrent; nuclear whorls smooth, simple and dextral; nepionic ornamentation for about one whorl fine transverse lirae parallel to growth lines, the lirae breaking up into rows of nodes or pustules, which are in some species small and fine but in others very coarse; inner whorls not resorbed; operculum unknown although, because of the evident close relationship to Naticopsis, an operculum similar to that of Naticopsis may be assumed with reasonable safety.
R. L. Batten 1995In the initial examination of the Magdalena Neritopsinae, I isolated two groups of specimens. One group has a subsutural and a lower outer whorl face row of spiral nodes; I assigned it to the genus Turbonitella. The other group has multiple spiral rows of nodes on the outer whorl face and it obviously belongs to the genus Trachydomia. As the study progressed, I noted that the Trachydomia species is relatively high-spired, revealing more of the early whorl outer whorl face. The early whorls have two rows of nodes on the outer whorl face, the same as the species of Turbonitella. Further examination showed that the Turbonitella species was, in fact, merely immature specimens of Trachydomia.