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Ammonites biplex bifurcatus

Cephalopoda - Ammonitida

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), Pandey et al. (2012).

Sister species lacking formal opinion data
A. birchii, A. boucaultianum, A. brookii, A. daonicus, A. dichotomus, A. latilabiatus, A. maximiliani, A. novozelandicus, A. quadrilabiatus, A. radians, A. scunthorpensis, A. triplex, A. vertebralis
Entered
by M. Clapham on 2023-03-25; modified by P. Scofield on 2024-03-23

Synonymy list
YearName and author
1846Ammonites biplex bifurcatus Quenstedt
1847Ammonites biplex bifurcatus Quenstedt p. 163 figs. Pl 12, fig 11
1984Perisphinctes (Dichotomoceras) bifurcatus Atrops and Benest figs. Pl 1, fig 1
1994Perisphinctes (Dichotomoceras) bifurcatus Schlegelmilch p. 61 figs. Pl 20, fig 3
2012Perisphinctes (Dichotomoceras) bifurcatus Pandey et al. p. 521

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Protostomia
—Spiralia
superphylumLophotrochozoa
phylumMollusca
RankNameAuthor
classCephalopodaCuvier 1797
subclassAmmonoidea()
orderAmmonitidaHaeckel 1866
genusAmmonites
speciesbiplexSowerby 1821
subspeciesbifurcatusQuenstedt 1847

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
ReferenceDiagnosis
D.K. Pandey et al. 2012Shell 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.