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Cataschisma typa
Taxonomy
Cataschisma typa was named by Branson (1909). Its type specimen is Walker Museum UC 11535, a shell, and it is a 3D body fossil. Its type locality is Residuary Auburn Chert Beds, east of Auburn , which is in a Turinian carbonate claystone in the Decorah Formation of Missouri. It is the type species of Cataschisma.
Synonymy list
| Year | Name and author |
|---|---|
| 1909 | Cataschisma typa Branson pp. 43 - 44 figs. PI. 7 f. 15 |
| 1941 | Cataschisma typa Knight p. 69 figs. pl. 28 f. 6 |
| 2004 | Cataschisma typica Rohr et al. p. 231 figs. pl. 2 f. 16-19 |
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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.
†Cataschisma typa Branson 1909
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Rather small, naticiform, narrowly phaneromphalous gastropods with a short slit rather low in the outer lip, the slit generating a selenizone; whorl profile gently arched between sutures, broadly rounded on the final whorl; sutures shallow; base rounded, narrowly phaneromphalous; nucleus unknown; columellar and parietal lips unknown; outer lip with a short, rather wide slit well below the middle of the whorl, the slit giving rise to a correspondingly broad, slightly depressed selenizone, the margin of the lip passing downward from the upper suture at first in a nearly radial direction and then curving to a gentle backward obliquity and forward convexity to the selenizone, below the selenizone radial in direction for a very short space and then curving to a backward obliquity corresponding to that of the lip above the selenizone and continuing to the umbilical slope; ornamentation seemingly lacking; shell structure unknown. The holotype measures about 5 mm. in height, 5 mm. in width, and has a pleural angle of about 97 degrees. |