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Dichotomites
Taxonomy
Dichotomites was named by Koenen (1909) [Sepkoski's age data: K Vala-u]. Its type is Ammonites bidichotomus.
It was reranked as Polyptychites (Dichotomites) by Bogomolov (1989).
It was assigned to Polyptychites by Bogomolov (1989); to Ammonoidea by Sepkoski (2002); and to Polyptychitinae by Alsen (2006).
It was reranked as Polyptychites (Dichotomites) by Bogomolov (1989).
It was assigned to Polyptychites by Bogomolov (1989); to Ammonoidea by Sepkoski (2002); and to Polyptychitinae by Alsen (2006).
Species
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1909 | Dichotomites Koenen |
| 1979 | Ringnesiceras (Elleficeras) Kemper and Jeletzky p. 11 |
| 1988 | Ringnesiceras (Elleficeras) Jeletzky and Kemper p. 208 |
| 1989 | Polyptychites (Dichotomites) Bogomolov p. 61 |
| 2002 | Dichotomites Sepkoski |
| 2006 | Dichotomites Alsen p. 111 |
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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.
G. †Dichotomites Koenen 1909
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Subg. †Dichotomites (Dichotomites) Koenen 1909
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†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]
†Dichotomites (Dichotomites) krausei Kemper 1978
Subg. †Dichotomites (Prodichotomites) Kemper 1971
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†Dichotomites (Prodichotomites) amundensis Kemper and Jeletzky 1979
†Dichotomites (Prodichotomites) crassus Kemper 1978
†Dichotomites (Prodichotomites) ellefensis Kemper and Jeletzky 1979
†Dichotomites (Prodichotomites) flexicosta Koenen 1902
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Invalid names: Neocraspedites speetonensis Spath 1924 [synonym], Polyptychites gradatus Koenen 1902 [synonym]
†Dichotomites (Prodichotomites) mackneyi Alsen 2006
†Dichotomites (Prodichotomites) polytomus Koenen 1902
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Invalid names: Polyptychites ramulosus Koenen 1902 [synonym]
†Prodichotomites complanatus Koenen 1902
†Prodichotomites fissuratus Koenen 1902
†Prodichotomites glaber Jeletzky and Kemper 1988
†Prodichotomites grotriani Neumayr and Uhlig 1881
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Invalid names: Olcostephanus obsoletecostatus Neumayr and Uhlig 1881 [synonym]
†Prodichotomites ivanovi Aristov 1974
†Prodichotomites perovalis Koenen 1902
†Prodichotomites pfaffi Jeletzky and Kemper 1988
†Prodichotomites robustus Jeletzky and Kemper 1988
†Prodichotomites undulatus Koenen 1902
Invalid names: Ringnesiceras Kemper and Jeletzky 1979 [synonym]
†Dichotomites multicostatus Imlay 1940
†Polyptychites (Dichotomites) bidichotomoides Kemper 1978
Invalid names: Ringnesiceras (Elleficeras) Kemper and Jeletzky 1979 [synonym]
Diagnosis
No diagnoses are available
Measurements
No measurements are available
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| Source: o = order, c = class | |||||
| References: Kiessling 2004, Kiessling 2003 | |||||
Age range: base of the Valanginian to the top of the Early/Lower Hauterivian or 139.80000 to 130.00000 Ma
Collections (46 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Early/Lower Valanginian | Canada (British Columbia) | D. giganteus (87392) | |
| Early/Lower Valanginian | Canada (Northwest Territories) | Ringnesiceras amundense (87554) | |
| Early/Lower Valanginian | Russian Federation | D. sp. (65748) | |
| Early/Lower Valanginian | Greenland | D. krausei (83686) D. sp. (62527) | |
| Late/Upper Valanginian | Greenland | D. bidichotomites, D. sp., D. crassus (83708) D. sp. (83687) | |
| Late/Upper Valanginian | Poland (Gmina Tomaszów Mazowiecki) | D. evolutus, D. krausei, Prodichotomites complanatus (192529) D. evolutus, D. triptychoides, Prodichotomites complanatus (192530) D. evolutus, Prodichotomites complanatus (192527 192528) D. triptychoides, D. evolutus, Prodichotomites complanatus (192531 192532 192533) Prodichotomites complanatus (192523 192524 192525 192526) | |
| Late/Upper Valanginian | Russian Federation | D. sp. (65751) D. tridichotomus, D. tener, D. terscisseformis, D. tardescissus, D. polytomus, D. involutus (65459) Polyptychites bidichotomoides (189667) Polyptychites bidichotomoides, Polyptychites bidichotomus (189644 189663 189664) Polyptychites bidichotomus (189643 189662 189666) Polyptychites sp. (189645 189646 189647 189665 189671) | |
| Late/Upper Valanginian | Canada (Northwest Territories) | Prodichotomites hollwedensis (87527) Ringnesiceras amundense (87552) Ringnesiceras ellefense (87557) Ringnesiceras sp., Ringnesiceras ellefense (87556) | |
| Late/Upper Valanginian | Austria | Prodichotomites sp. (64831) | |
| Late/Upper Valanginian - Early/Lower Hauterivian | Russian Federation | D. triptychoides (65463) | |
| Valanginian | Poland | Craspedites complanatus (2081) D. biscissus, Polyptychites gradatus (2097) | |
| Valanginian | Greenland | D. petschorensis (83712) | |
| Valanginian | Russian Federation | D. tardescissus (65458) | |
| Valanginian | Svalbard and Jan Mayen | Polyptychites perovalis (212036) Polyptychites perovalis, Polyptychites bidichotomus (211954) | |
| Hauterivian | USA (Oregon) | D. sp. (45687) | |
| Hauterivian | Mexico (Coahuila) | D. multicostatus (2145) |