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Perisphinctes (Dichotomosphinctes) tizianiformis
Taxonomy
Perisphinctes tizianiformis was named by Choffat (1893).
It was recombined as Orthosphinctes (Orthosphinctes) tizianiformis by Schlegelmilch (1994); it was recombined as Perisphinctes (Dichotomosphinctes) tizianiformis by Pandey et al. (2012).
It was recombined as Orthosphinctes (Orthosphinctes) tizianiformis by Schlegelmilch (1994); it was recombined as Perisphinctes (Dichotomosphinctes) tizianiformis by Pandey et al. (2012).
Sister species lacking formal opinion data
Dichotomosphinctes decaryi, Dichotomosphinctes martini, Dichotomosphinctes sikilyensis, P. africanus, P. andium, P. mairei-matheyi, P. malinowskae, P. panderi, P. polygyratus, P. praestenocyclus, P. progeron, P. quadratus, P. scythicus, P. siemiradzkii, P. eucostatus, P. quadratus, P. pickeringius, P. buckmani, P. buckmanni, P. luciaeformis, P. crassissimus, P. A, P. B, P. anguiculus, P. patturatensis, P. siemirazkii, P. roedereri, P. alatus, P. andelotensis, P. densecostatus, P. pumilus, P. dorsoplanus, P. dacquei, P. polygyratus
Synonymy list
| Year | Name and author |
|---|---|
| 1893 | Perisphinctes tizianiformis Choffat p. 19 figs. Pl. 3, figs 1-4 |
| 1994 | Orthosphinctes (Orthosphinctes) tizianiformis Schlegelmilch p. 65 figs. Pl 22, fig 4 |
| 2012 | Perisphinctes (Dichotomosphinctes) tizianiformis Pandey et al. p. 519 |
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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.
†Perisphinctes (Dichotomosphinctes) tizianiformis Choffat 1893
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Shells moderately large, evolute, compressed, complete with small lappets (Fig. 50C). Whorl section oval in outline with slightly arched lanks, which merge into the rounded venter (Fig. 50B). Ornamentation consists of isocostate, sharp, prorsiradiate primary ribs, which branch into two or, more rarely, three secondaries at the ventrolateral region and cross the venter with slight forward-directed convexity (Fig. Fig. 50: A. Perisphinctes (Dichotomosphinctes) cf. tizianiformis ChoFFat, 1893; Dhosa Conglomerate Bed, Jara Dome; GZN2009II 206. Whorl section at unknown diameter. B-C. Perisphinctes (Dichotomosphinctes) tizianiformis ChoFFat, 1893; Kantkote Ammonite Beds, Tramau River. B. Whorl section at ca. 43 mm diameter; GZN2010I 243. C. Ribbing pattern on right lank at ca. 105 mm diameter; GZN2010I 149. 50C). Rarely, isolated secondary ribs occur, giving the appearance of trifurcation or polygyrate ornamentation. Ribs on outer whorl moderately sharp. Constrictions at least three on outer whorl, in addition to a broader constriction just before the aperture. Umbilical wall distinct, smooth, and with undercut. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2003, Kiessling 2004 | |||||
Collections
No collection or age range data are available