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Megistocerithium
Taxonomy
Megistocerithium was named by Kase et al. (2015) [Kase in Kase et al. 2015]. Its type is Megistocerithium magoi.
It was assigned to Eustomatidae by Kase et al. (2015).
It was assigned to Eustomatidae by Kase et al. (2015).
Species
M. magoi (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 2015 | Megistocerithium Kase et al. p. 302 |
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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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. Kase et al. 2015 | Shell very large, elongate cerithiform; later whorls seven-sided pyramidal in shape formed by juxtaposed, weakly opisthocline, prominent axial ribs. Spiral sculpture of sharp primary cords, their interspaces densely packed with one to several secondary cords, all crossed by axial ribs. Aperture elliptical, flared, plane of aperture almost orthocline to shell axis. Last whorl constricted anteriorly, with an obtuse ventrolateral varix. Outer lip thick, flaring, varix-like, bevelled, and smooth within, crenate outside in accordance with strong spiral cords on last whorl; adapical end of outer lip well extended onto last whorl, forming flat triangular area, with a shallow groove due to deposition of shell material defined by a parietal plait extending from posterior anal canal. Anterior siphonal canal long, tube-like, extending antero-dorsally. Parietal area smooth with thick callus. Columellar lip covered with thick, expanded, reflected inductura, being broadly concave dorsally. |
Measurements
No measurements are available
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| Source: subo = suborder, c = class | |||||
| References: Kiessling 2004, Hendy et al. 2009 | |||||