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Schizodus
Taxonomy
Schizodus was named by King (1844) [Sepkoski's age data: S Ludl-l P Djhu Sepkoski's reference number: 1066].
It was reranked as Axinus (Schizodus) by King (1844).
It was assigned to Axinus by King (1844); to Myophoriidae by Vokes (1980); to Trigonioida by Sepkoski (2002); and to Schizodidae by Newell and Boyd (1975), Bouchet et al. (2010).
It was reranked as Axinus (Schizodus) by King (1844).
It was assigned to Axinus by King (1844); to Myophoriidae by Vokes (1980); to Trigonioida by Sepkoski (2002); and to Schizodidae by Newell and Boyd (1975), Bouchet et al. (2010).
Species
S. acuminatus, S. affinis, S. alpinus, S. altus, S. amplus (syn. S. mooresi), S. antiquus, S. australis, S. bifidus, S. canalis, S. cardissa, S. chemungensis, S. chesterensis, S. compressus, S. compressus, S. crespinae, S. cuneatus, S. curtiformis, S. curtus, S. cycloliratus, S. deparcus, S. depressus (syn. S. abruptus, S. circularis), S. dianensis, S. dubiiformis, S. ellioti, S. elongatus, S. emarginatus, S. ferrieri, S. fitzroyensis, S. globosus, S. guizhouensis, S. hedongensis, S. japonicus, S. jiangbianensis, S. jiangheensis, S. jiangxiensis, S. jiaozishanensis, S. kennedyensis, S. lianyuanensis, S. lopingensis, S. magnus, S. meekanus, S. minutus, S. negrii, S. obscurus (syn. Axinus parvus, Axinus pucillus, Axinus undatus, Lucina minima), S. occidentalis, S. ovatus, S. parvulus, S. pinguis, S. pintoensis, S. qinglongensis, S. rhynchophorus, S. rossicus, S. rotundatus, S. sandimanensis, S. schlotheimi, S. securus, S. sinensis, S. subcircularis, S. subobscurus, S. subovatus, S. subquadratus, S. supaiensis, S. texanus, S. tibeticus, S. trigonalis, S. truncatus (syn. S. dubius), S. tschernjaki, S. ulrichi, S. wheeleri, S. wyomingensis, S. xiangtanensis
Species lacking formal opinion data
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1844 | Axinus (Schizodus) King |
| 1844 | Schizodus King |
| 1885 | Protoschizodus de Koninck pp. 125 - 126 |
| 1975 | Schizodus Newell and Boyd p. 95 |
| 1980 | Schizodus Vokes p. 97 |
| 1980 | Schizodus jiaozishanensis Xu p. 7 |
| 1980 | Schizodus qinglongensis Xu p. 14 |
| 2002 | Schizodus Sepkoski |
| 2010 | Schizodus Bouchet 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.
G. †Schizodus King 1844
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†Schizodus acuminatus Hoare et al. 1978
†Schizodus affinis Herrick 1887
†Schizodus alpinus Hall 1858
†Schizodus altus Newell and Boyd 1975
†Schizodus antiquus Hind 1898
†Schizodus australis Runnegar 1969
†Schizodus bifidus Ciriacks 1963
†Schizodus canalis Branson 1930
†Schizodus cardissa Waagen 1881
†Schizodus chemungensis Conrad 1842
†Schizodus chesterensis Meek and Worthen 1860
†Schizodus compressus Rogers 1900
†Schizodus compressus Waagen 1881
†Schizodus crespinae Dickins 1957
†Schizodus cuneatus Meek 1875
†Schizodus curtiformis Walcott 1884
†Schizodus curtus Meek and Worthen 1866
†Schizodus cycloliratus Harrington 1955
†Schizodus deparcus Walcott 1884
†Schizodus depressus Worthen 1884
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Invalid names: Schizodus abruptus Girty 1915 [objective synonym], Schizodus circularis Worthen 1884 [synonym]
†Schizodus dianensis Guo 1985
†Schizodus dubiiformis Waagen 1881
†Schizodus ellioti Maxwell 1964
†Schizodus elongatus Grabau 1931
†Schizodus emarginatus Reed 1944
†Schizodus ferrieri Girty 1910
†Schizodus fitzroyensis Dickins 1963
†Schizodus globosus Maxwell 1964
†Schizodus guizhouensis Liu and Xu 1976
†Schizodus hedongensis Liu 1976
†Schizodus japonicus Hayasaka 1925
†Schizodus jiangbianensis Fang and Yin 1995
†Schizodus jiangheensis Lu 1986
†Schizodus jiangxiensis Li and Ding 1982
†Schizodus kennedyensis Dickins 1956
†Schizodus lianyuanensis Zhang 1977
†Schizodus lopingensis Kayser 1883
†Schizodus magnus Worthen 1884
†Schizodus meekanus Girty 1900
†Schizodus minutus Maxwell 1964
†Schizodus negrii Bittner 1892
†Schizodus obscurus Sowerby 1821
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Invalid names: Axinus parvus Brown 1839 [synonym], Axinus pucillus Brown 1839 [synonym], Axinus undatus Brown 1839 [synonym], Lucina minima Brown 1839 [synonym]
†Schizodus occidentalis Reed 1930
†Schizodus ovatus Meek and Hayden 1858
†Schizodus parvulus Cooper 1953
†Schizodus pinguis Waagen 1881
†Schizodus pintoensis Walcott 1884
†Schizodus rhynchophorus Ponomarenko 2011
†Schizodus rossicus de Verneuil 1845
†Schizodus rotundatus Brown 1839
†Schizodus sandimanensis Dickins 1963
†Schizodus schlotheimi Geinitz 1841
†Schizodus securus Shumard 1859
†Schizodus sinensis Liu 1976
†Schizodus subcircularis Herrick 1887
†Schizodus subobscurus Licharew 1933
†Schizodus subovatus Ciriacks 1963
†Schizodus subquadratus Grabau 1931
†Schizodus supaiensis Winters 1963
†Schizodus texanus Clifton 1942
†Schizodus tibeticus Liu and Cui 1983
†Schizodus trigonalis Sayre 1930
†Schizodus tschernjaki Muromtseva 1974
†Schizodus ulrichi Worthen 1890
†Schizodus wheeleri Swallow 1863
†Schizodus wyomingensis Newell and Boyd 1975
†Schizodus xiangtanensis Fang 1987
Invalid names: Protoschizodus de Koninck 1885 [synonym], Schizodus jiaozishanensis Xu 1980 [nomen nudum], Schizodus qinglongensis Xu 1980 [nomen nudum]
Diagnosis
No diagnoses are available
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| height | 1 | 24.0 | - | - | - | - | |
| shell height | 23 | 15.1 | - | - | - | - | |
| valve height | 151 | 21.6 | 1.88 | 42.6 | 23.0 | 9.54 |
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| Source: o = order, c = class | |||||
| Reference: Aberhan et al. 2004 | |||||
Age range: base of the Homerian to the top of the Middle Pleistocene or 430.60000 to 0.12900 Ma
Collections (636 total)
Oldest occurrences | |||
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Homerian - Gorstian | USA (Alaska) | S. sp. A, S. sp. B (153969) | |
| Lochkovian | China (Guangxi) | S. cuneus (3998) S. cuneus, S. appressus (4002) S. peregrins (4003) | |
| Early/Lower Emsian | Australia (Victoria) | S. oweni (35555) | |
| Early/Lower Emsian | China (Guangxi) | S. sp. (3983) | |
| Emsian | Australia (New South Wales) | S. oweni (35556) S. truemani (35557 35558) | |
| Emsian | Canada (Quebec) | S. sp. (608) | |
| Emsian - Eifelian | USA (Alaska) | S. sp. (111906) | |
| Middle Devonian | USA (Alaska) | S. sp. (111903) | |
| Middle Devonian | USA (New York) | S. chemungensis (91246 91248 91250) | |
| Givetian | USA (Ohio) | S. appressus (76557 76565) | |
Youngest occurrences |
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| Time interval | Ma | Country or state | PBDB collection number |
| Changhsingian | Pakistan | S. compressus (119730) S. dubiiformis (126889) S. pinguis (119689 119728 119729) S. pinguis, S. rotundatus, S. dubiiformis (89061) S. rotundatus (90251) S. rotundatus, Myophoria cardissa (119720) S. sp., S. cardissa (126933) S. sp., S. pinguis, S. cardissa (126883) S. sp., S. pinguis, S. rotundatus (126934) | |
| Changhsingian | Italy (South Tyrol) | Edmondia rudis (204983) | |
| Changhsingian | India (Kashmir) | S. sp. (115373) | |
| Changhsingian | China (Guangxi) | S. sp. (149211 206151) | |
| Changhsingian | New Zealand | S. sp. (98149) | |
| Late/Upper Triassic | Turkey (Balıkesir) | S. ewaldi, S. negrii (201912) | |
| Late/Upper Triassic - Early/Lower Jurassic | USA (Alaska) | S. appressus (112256) | |
| Rhaetian | United Kingdom (England) | S. ewaldi (163306 163311) S. sp. (163317) | |
| Rhaetian | United Kingdom (Gloucestershire) | S. ewaldi (204163 204164) | |
| Middle Pleistocene | Japan | S. japonicus (233708) | |