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Perisphinctes (Dichotomoceras) virguloides
Taxonomy
Perisphinctes virguloides was named by Waagen (1875). It is a 3D body fossil. Its type locality is Kanthkot Ammonite Bed exposed on bed of Trambau River, which is in an Oxfordian/Kimmeridgian marine sandstone in India.
It was recombined as Prososphinctes virguloides by Collignon (1959); it was recombined as Perisphinctes (Dichotomoceras) virguloides by Pandey et al. (2012) and Pandey et al. (2013).
It was recombined as Prososphinctes virguloides by Collignon (1959); it was recombined as Perisphinctes (Dichotomoceras) virguloides 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 |
|---|---|
| 1959 | Prososphinctes virguloides Collignon p. 88 fig. 351 |
| 2012 | Perisphinctes (Dichotomoceras) virguloides Pandey et al. p. 520 |
| 2013 | Perisphinctes (Dichotomoceras) virguloides Pandey et al. |
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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) virguloides Waagen 1875
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Shells moderately large, incomplete, evolute, compressed. Whorl section with lat lanks and moderately rounded venter (Fig. 52A). Ornamentation consists of gradually varicostate, ine (inner whorls) to moderately coarse (outer whorls; Fig. 52B), long, biplicate, slightly prorsiradiate primary ribs, branching into two slightly below the ventrolateral region. The slightly thinner secondaries cross the venter with faint forward-directed convexity. Occasionally, a third single secondary occurs. Constrictions distinct, inclined towards aperture, two per whorl. | |
| D.K. Pandey et al. 2013 | Shells incomplete, evolute. Whorl sections initially depressed, gradually becoming compressed, oval with maximum thickness at inner-fifth of whorl height. Flanks slightly arched, and ventrolateral shoulder broadly rounded in inner whorls, moderately distinct with a narrowly rounded venter in outer whorls. Umbilical edge moderately distinct. Ornamentation consists of gradually varicostate, slightly prorsiradiate, sharp, very thin, dense (inner whorls) to sharp, distant, moderately coarse (outer whorls) long primary ribs, originating at the umbilical suture, crossing the umbilical edge with a backward slope, then turning prorsiradiate on the flank, branching into two secondaries slightly below the ventrolateral edge. Single, undivided primary ribs are common on inner whorls. Secondaries slightly thinner, crossing the venter with slight forward-directed sinuosity and gallop. Posterior secondary rib of each primary rib slightly rursiradiate. At least three distinct, forwardly inclined constrictions present in the inner whorls. |
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Late/Upper Oxfordian to the top of the Oxfordian or 161.20000 to 157.30000 Ma
Collections (7 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Oxfordian | Madagascar | Prososphinctes virguloides (98192) | |
| Oxfordian - Kimmeridgian | Ethiopia | Perisphinctes virguloides (94500) | |
| Oxfordian - Kimmeridgian | Yemen | Perisphinctes virguloides (94503) | |
| Late/Upper Oxfordian | Madagascar (Atsimo-Andrefana) | Prososphinctes virguloides (234266) | |
| Late/Upper Oxfordian - Early/Lower Kimmeridgian | India (Gujarat) | Perisphinctes virguloides (234314 234316) | |
| Late/Upper Oxfordian - Early/Lower Kimmeridgian | Ethiopia | Perisphinctes virguloides (93501) |