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Perisphinctes (Dichotomoceras) dichotomum
Taxonomy
Dichotomoceras dichotomum was named by Buckman (1919).
It was recombined as Perisphinctes (Dichotomoceras) dichotomum by Pandey et al. (2012) and Pandey et al. (2013).
It was recombined as Perisphinctes (Dichotomoceras) dichotomum by Pandey et al. (2012) and Pandey et al. (2013).
Sister species lacking formal opinion data
Dichotomoceras cliqueti, Dichotomoceras quadratum, Dichotomoceras rabenjanaharyi, Dichotomoceras umbilicatum, 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 |
|---|---|
| 2012 | Perisphinctes (Dichotomoceras) dichotomum Pandey et al. p. 523 |
| 2013 | Perisphinctes (Dichotomoceras) dichotomum Pandey et al. p. 156 |
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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 (Dichotomoceras) dichotomum Buckman 1919
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Small fragment of the body chamber of a moderately large, evolute, and slightly depressed form. Whorl section subquadrangular with slightly arched lanks and rounded venter (Fig. 57A). Ornamentation on body chamber consists of prorsiradiate, thick, sharp, distant, biplicate ribs. Primaries originate from inner part of umbilical margin in a rursiradiate fashion and then turn forward, branching slightly below the ventrolateral region (Fig. 57B). Secondaries cross the venter straight or with very slight forward-directed convexity. Umbilical wall short, smooth, steep. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Collections
No collection or age range data are available