PBDB Taxon

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Dichotomites (Dichotomites) bidichotomus

Cephalopoda - Ammonitida - Polyptychitidae

Taxonomy

Ammonites bidichotomus was named by d'Orbigny (1841). It is not a trace fossil. It is the type species of Dichotomites, Dichotomites (Dichotomites).

It was recombined as Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989); it was recombined as Dichotomites (Dichotomites) bidichotomus by Alsen (2006).

Sister species lacking formal opinion data

D. giganteus, D. tardescissus, D. triptychoides, D. bidichotomites

Synonyms

Dichotomites (Prodichotomites) hollwedensis was named by Kemper (1978). It is a 3D body fossil.

It was recombined as Prodichotomites hollwedensis by Jeletzky and Kemper (1988); it was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Ringnesiceras (Elleficeras) ellefense was named by Kemper and Jeletzky (1979). Its type specimen is GSC 61757, a shell, and it is a mold. Its type locality is GSC Loc. 93870 - Amund Ringnes Island [Deer Bay Fm], which is in a Valanginian marine siliciclastic in the Deer Bay Formation of Canada.

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Polyptychites terscissus was named by Koenen (1902).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Polyptychites tardescissus was named by Koenen (1902).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Polyptychites frechi was named by Koenen (1902).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Dichotomites (Dichotomites) romani was named by Kemper (1978).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Amundiptychites sachsi was named by Golbert and Klimova (1983).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Amundiptychites chatangensis was named by Golbert and Klimova (1983).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Dichotomites (Dichotomites) involutus was named by Burdykina (1983).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Dichotomites toryschensis was named by Luppov (1983).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).
Dichotomites mangyschlakensis was named by Luppov (1983).

It was synonymized subjectively with Polyptychites (Dichotomites) bidichotomus by Bogomolov (1989).

Synonymy list

Year	Name and author
1841	Ammonites bidichotomus d'Orbigny
1902	Polyptychites frechi Koenen
1902	Polyptychites tardescissus Koenen
1902	Polyptychites terscissus Koenen
1978	Dichotomites (Dichotomites) romani Kemper
1978	Dichotomites (Prodichotomites) hollwedensis Kemper
1979	Ringnesiceras (Elleficeras) ellefense Kemper and Jeletzky pp. 11, 12 figs. pl. 1, fig. 3
1983	Dichotomites (Dichotomites) involutus Burdykina
1983	Amundiptychites chatangensis Golbert and Klimova
1983	Amundiptychites sachsi Golbert and Klimova
1983	Dichotomites mangyschlakensis Luppov
1983	Dichotomites toryschensis Luppov
1988	Prodichotomites hollwedensis Jeletzky and Kemper p. 130
1988	Ringnesiceras (Elleficeras) ellefense Jeletzky and Kemper p. 209 figs. Pl 60, figs 1A,B,3A-D; text-figs 61e
1989	Polyptychites (Dichotomites) bidichotomus Bogomolov p. 63 figs. Pl 25, figs 1-3; pl 26; pl 27; pl 28, fig 1; pl 29, fig 2; pl 32, fig 4; pl 33, fig 2; pl 34, fig 4;
2006	Dichotomites (Dichotomites) bidichotomus Alsen p. 112

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Cephalopoda	Cuvier 1797
subclass	Ammonoidea	()

Rank	Name	Author
order	Ammonitida
suborder	Ammonitina	Hyatt 1889
superfamily	Perisphinctaceae	Steinman 1890
family	Polyptychitidae	Wedekind 1918
subfamily	Polyptychitinae	Wedekind 1918
genus	Dichotomites	Koenen 1909
subgenus	Dichotomites	Koenen 1909
species	bidichotomus	(d'Orbigny 1841)

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.

†Dichotomites (Dichotomites) bidichotomus d'Orbigny 1841

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Invalid names: Amundiptychites chatangensis Golbert and Klimova 1983 [synonym], Amundiptychites sachsi Golbert and Klimova 1983 [synonym], Dichotomites (Dichotomites) involutus Burdykina 1983 [synonym], Dichotomites (Dichotomites) romani Kemper 1978 [synonym], Dichotomites (Prodichotomites) hollwedensis Kemper 1978 [synonym], Dichotomites mangyschlakensis Luppov 1983 [synonym], Dichotomites toryschensis Luppov 1983 [synonym], Polyptychites frechi Koenen 1902 [synonym], Polyptychites tardescissus Koenen 1902 [synonym], Polyptychites terscissus Koenen 1902 [synonym], Ringnesiceras (Elleficeras) ellefense Kemper and Jeletzky 1979 [synonym]

Diagnosis

No diagnoses are available