PBDB Taxon

Basic info	Taxonomic history	Classification	Included Taxa
Morphology	Ecology and taphonomy	External Literature Search	Age range and collections

Schizodus obscurus

Bivalvia - Trigoniida - Schizodidae

Taxonomy

Axinus obscurus was named by Sowerby (1821).

It was recombined as Schizodus obscurus by King (1850), Geinitz (1861), Langenhan (1899), Newell (1955), Logan (1967), Pattison (1970), Newell and Boyd (1975) and Prinoth and Posenato (2023).

Sister species lacking formal opinion data

S. appressus, S. axiniformis, S. chemungensis, S. cuneus, S. dilgryensis, S. ewaldi, S. impressus, S. jakovlevi, S. oweni, S. semistriatus, S. subelegans, S. truemani

Synonyms

Axinus parvus was named by Brown (1839). It is a 3D body fossil. Its type locality is Newtown, River Irk, Bed 8, which is in a Wuchiapingian shallow subtidal packstone in the United Kingdom.

It was synonymized subjectively with Schizodus schlotheimi by Geinitz (1861); it was synonymized subjectively with Schizodus obscurus by King (1850) and Pattison (1970).
Axinus undatus was named by Brown (1839). It is a 3D body fossil. Its type locality is Newtown, River Irk, Bed 8, which is in a Wuchiapingian shallow subtidal packstone in the United Kingdom.

It was synonymized subjectively with Schizodus schlotheimi by Geinitz (1861); it was synonymized subjectively with Schizodus obscurus by King (1850) and Pattison (1970).
Axinus pucillus was named by Brown (1839). It is a 3D body fossil. Its type locality is Newtown, River Irk, Bed 8, which is in a Wuchiapingian shallow subtidal packstone in the United Kingdom.

It was synonymized subjectively with Schizodus schlotheimi by Geinitz (1861) and Logan (1967); it was synonymized subjectively with Schizodus obscurus by Pattison (1970).
Lucina minima was named by Brown (1839). It is a 3D body fossil. Its type locality is Newtown, River Irk, Bed 8, which is in a Wuchiapingian shallow subtidal packstone in the United Kingdom.

It was synonymized subjectively with Schizodus schlotheimi by Geinitz (1861) and Logan (1967); it was synonymized subjectively with Schizodus obscurus by Pattison (1970).

Synonymy list

Year	Name and author
1821	Axinus obscurus Sowerby
1834	Axinus obscurus Phillips figs. Pl 3, fig 7
1839	Axinus parvus Brown p. 65 figs. Pl 6, fig 30
1839	Axinus undatus Brown p. 65 figs. Pl 6, fig 31
1839	Axinus pucillus Brown p. 66 figs. Pl 6, fig 32
1839	Lucina minima Brown p. 66 figs. Pl 6, fig 33
1848	Axinus obscurus Howse p. 246
1850	Schizodus obscurus King p. 189 figs. Pl 15, figs 23, 24
1861	Schizodus obscurus Geinitz p. 65 figs. Pl 13, figs 13-21
1899	Schizodus obscurus Langenhan p. 47 figs. Pl 2, fig 1
1955	Schizodus obscurus Newell p. 31 figs. Pl 1, figs 6-8,10
1967	Schizodus obscurus Logan p. 47 figs. Pl 8, figs 2-4
1970	Schizodus obscurus Pattison p. 149 figs. Pl 21, fig 12; pl 22, figs 1-3
1975	Schizodus obscurus Newell and Boyd p. 98 figs. 34-37
2023	Schizodus obscurus Prinoth and Posenato p. 35 fig. 21

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Bivalvia
—	Eubivalvia
subclass	Autobranchia	(Groblen 1894)

Rank	Name	Author
infraclass	Heteroconchia	(Gray 1854)
—	Uniomorphi	Gray 1854
—	Unioni	Gray 1854
—	Unionata	Gray 1854
order	Trigoniida	(Dall 1889)
superfamily	Trigonioidea	(Lamarck 1819)
family	Schizodidae
genus	Schizodus
species	obscurus	()

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.

†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]

Diagnosis

No diagnoses are available

Measurements

part	N	mean	minimum	maximum	median	s.d.
valve height	6	27.2	16.6	38.7	27.4	7.69

Composition:

aragonitec

Locomotion:

facultatively mobileo

Life habit:

infaunalo

Diet:

suspension feedero

Vision:

blindc

Created:

2004-02-28 12:34:20

Modified:

2004-02-28 14:34:20

Source: o = order, c = class

Reference: Aberhan et al. 2004

Age range: base of the Kungurian to the top of the Changhsingian or 279.30000 to 252.17000 Ma

Collections (60 total)

Time interval	Ma	Country or state	Original ID and collection number
Kungurian	279.3 - 272.3	Russian Federation	Schizodus obscurus (114349)
Wuchiapingian	259.9 - 254.17	United Kingdom (Durham)	Axinus obscurus (130875 130878)
Wuchiapingian	259.9 - 254.17	China (Guizhou)	Schizodus obscurus (111997 112001)
Wuchiapingian	259.9 - 254.17	United Kingdom	Axinus obscurus (130879) Axinus obscurus, Cardium N.S. (130854) Schizodus obscurus (130850 130853 130855 130856 130857 130858 130859)
Wuchiapingian	259.9 - 254.17	Lithuania	Schizodus obscurus (46412 46451 46471 46486 46516 46517)
Wuchiapingian	259.9 - 254.17	Latvia	Schizodus obscurus (46434 46445 46446 46518)
Wuchiapingian	259.9 - 254.17	Greenland	Schizodus obscurus (115897 115899 115906 115911 115915)
Wuchiapingian	259.9 - 254.17	United Kingdom (England)	Axinus obscurus (116170 116171 116172 117876 117885 117889 119883 119884 119885) Axinus obscurus, Axinus parvus, Axinus undatus, Axinus pucillus, Lucina minima (119886) Schizodus obscurus (24085 89594 109715 109720 112852 112855 130767 208902 208904 208905)
Wuchiapingian	259.9 - 254.17	United Kingdom (Northern Ireland)	Schizodus obscurus (208900)
Changhsingian	254.17 - 252.17	Italy	Schizodus obscurus (230017 230022 230023 230024 230025 230026 230037 230045 230054)
Changhsingian	254.17 - 252.17	Italy (South Tyrol)	Edmondia rudis (204983)