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Ammonites biplex bifurcatus
Taxonomy
Ammonites biplex bifurcatus was named by Quenstedt (1847) [Ammonites parkinsoni bifurcatus].
It was recombined as Perisphinctes (Dichotomoceras) bifurcatus by Atrops and Benest (1984), Schlegelmilch (1994) and Pandey et al. (2012).
It was recombined as Perisphinctes (Dichotomoceras) bifurcatus by Atrops and Benest (1984), Schlegelmilch (1994) and Pandey et al. (2012).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1846 | Ammonites biplex bifurcatus Quenstedt |
| 1847 | Ammonites biplex bifurcatus Quenstedt p. 163 figs. Pl 12, fig 11 |
| 1984 | Perisphinctes (Dichotomoceras) bifurcatus Atrops and Benest figs. Pl 1, fig 1 |
| 1994 | Perisphinctes (Dichotomoceras) bifurcatus Schlegelmilch p. 61 figs. Pl 20, fig 3 |
| 2012 | Perisphinctes (Dichotomoceras) bifurcatus Pandey et al. p. 521 |
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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.
†Ammonites biplex bifurcatus Quenstedt 1847
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| D.K. Pandey et al. 2012 | Shell small, evolute, depressed. Whorl section slightly subquadrate with arched lanks, which merge smoothly into the well rounded venter (Fig. 54A). Ornamentation consists of sharp primary ribs bifurcating slightly below the ventrolateral region. Occasionally, primaries split just above the umbilical margin (Fig. 54B). Secondaries cross the venter with slight forwarddirected convexity. Constrictions moderately distinct. |