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Omphalocirrus grandis
Taxonomy
Arctomphalus grandis was named by Tolmachoff (1930). Its type specimen is PM A 19229, a shell, and it is a 3D body fossil. Its type locality is Vestre Börgen, east shore of Goose Fjord. Ellesmere Island, which is in an Emsian carbonate limestone in the Disappointment Bay Formation of Canada. It is the type species of Arctomphalus.
It was recombined as Omphalocirrus grandis by Gubanov et al. (1995).
It was recombined as Omphalocirrus grandis by Gubanov et al. (1995).
Synonymy list
| Year | Name and author |
|---|---|
| 1930 | Arctomphalus grandis Tolmachoff p. 49 figs. pl. 4 f. 1-2; pl. 5 f. 1 |
| 1941 | Arctomphalus grandis Knight p. 45 figs. pl. 68 f. 2a-b |
| 1966 | Arctomphalus grandis Yochelson pp. 38 - 40 figs. pl. 1 f. 1, 6; pl. 2 f. 1-2 |
| 1995 | Omphalocirrus grandis Gubanov et al. p. 433 |
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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.
†Omphalocirrus grandis Tolmachoff 1930
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. B. Knight 1941 | Large, discoidal, coiled gastropods with a flat spire, wide umbilicus, and a series of probably spine-like nodes on the lower surface9; whorl profile very gently arched above, strongly rounded on the outer whorl face, and falling sharply inward as the base is approached; base of the whorls strongly rounded; upper sutures seemingly not deep, lower sutures sharply incised, moderately deep; apertural margins unknown though seemingly the nodes occupying the crest of the arbitrarily chosen base of the whorls indicate an intermittent notch-keel; ornamentation moderately strong, even transverse lirae on the base of the earlier whorls, the course of the lirae interrupted by the basal nodes, ornamentation of the later whorls and of the upper surface unknown; nucleus unknown; shell rather thin, its structure unknown. The holotype measures about 65 mm. in height (thickness) and about 230 mm. in diameter. |
Measurements
No measurements are available
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| Source: g = genus, c = class | |||||
| References: Kiessling 2004, Wagner 2023 | |||||