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Perisphinctes (Dichotomosphinctes) antecedens
Taxonomy
Perisphinctes antecedens was named by Salfeld (1914).
It was recombined as Perisphinctes (Dichotomosphinctes) antecedens by Schlegelmilch (1994) and Pandey et al. (2012).
It was recombined as Perisphinctes (Dichotomosphinctes) antecedens by Schlegelmilch (1994) and 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 |
|---|---|
| 1914 | Perisphinctes antecedens Salfeld |
| 1994 | Perisphinctes (Dichotomosphinctes) antecedens Schlegelmilch p. 59 figs. Pl 18, fig 1 |
| 2012 | Perisphinctes (Dichotomosphinctes) antecedens Pandey et al. p. 510 |
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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) antecedens Salfeld 1914
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Specimens small, fragments of phragmocones. Whorl section subrounded (inner whorls) to oval (outer whorls; Fig. 35), slightly compressed with maximum thickness of the whorl slightly above the umbilical margin. Ornamentation consists of gradually varicostate, very ine (inner whorls) to moderately coarse and distant (outer whorls) primary ribs, originating at the umbilical suture in a slightly rursiradiate fashion, bending forwards on the rounded umbilical margin, and running prorsiradiately on the slightly arched (inner whorls) to lat lanks (outer whorls). Primaries branch into two or three secondaries, the third being mostly free, slightly below the ventrolateral shoulder. Occasionally secondaries of one primary connect with two adjacent primaries on the other side of the specimen (”galloping”). Secondaries cross the venter with slight forward-directed convexity. Constrictions present. |