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Cerithioides permicum
Taxonomy
Cerithioides permicum was named by Licharev (1967). Its type specimen is TsNIGR 8336/136, a shell, and it is a 3D body fossil. Its type locality is Dastarsay Section, Beds 3-5, Karachatyr Range, which is in an Asselian shallow subtidal limestone in Kyrgyzstan.
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.
†Cerithioides permicum Licharev 1967
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. V. Mazaev 2011 | The shell is turreted, composed of many slowly expanding whorls; the umbilicus is absent. The suture is thin, impressed, and shallow. The protoconch is not preserved. The whorl face in the early whorls is nearly straight, weakly convex, relatively abruptly passing smoothly into the whorl base, but without forming a carina. In the last whorls, the whorl face is rounded, gradually fusing with the whorl base, forming a evenly curved arch. The widthto height ratio of the whorl is about 0.5. The whorl face is smooth. The selenizone is narrow, straight or slightly convex in cross section, smooth, bounded by two thin grooves or is slightly elevated over the adjacent shell surface, positioned below the midwhorl face. The band between the lower suture and selenizone is equal to, or 1.5 times greater than its width. The whorl base is ornamented with slightly flattened spiral lirae rounded in cross section. Their width equals or slightly less than the selenizone width, while the lirae are separated by thin grooves. In the last whorl, the number of spiral lirae is up to six. The growth lines are thin, prosocline over the selenizone at 45°; beneath the selenizone, they are opisthocline at 13°. On the selenizone, growth lines are indiscernible. Apertural margins are not preserved. |