PBDB Taxon

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

Oxytoma inequivalvis

Bivalvia - Pectinida - Oxytomidae

Taxonomy

Avicula inequivalvis was named by Sowerby (1819).

It was recombined as Oxytoma inaequivalve by Waagen (1901), Krumbeck (1924); it was recombined as Oxytoma inaequivalvis by Borissiak (1909); it was recombined as Oxytoma inequivalve by Cox (1935); it was recombined as Oxytoma (Oxytoma) inequivalvis by Aberhan (1998); it was recombined as Oxytoma inequivalvis by Cox (1965), Hollingworth et al. (1990), Paredes et al. (2013).

Sister species lacking formal opinion data

O. arcricostata, O. arcticostata, O. arizonensis, O. articostata, O. censorius, O. contorta, O. cornueliana, O. costata, O. czekanovskii, O. danica, O. dieneri, O. dumortieri, O. expansa, O. ferrugineum, O. gussevi, O. inaequivalis, O. inaequivalve, O. inaequivalvis, O. inaequivalvis, O. inaequvalve, O. inaquivalve, O. inequivalva, O. intermedia, O. jacksoni, O. koniensis, O. laevicostata, O. majsisovosi, O. mclearni, O. mojsisovicsi, O. multistriatum, O. munsteri, O. oppeli, O. papyria, O. pectinatum, O. pulchra, O. seminudum, O. semiradiata, O. sinemuriensis, O. startense, O. subzitteli, O. tenuicostata, O. tetoriense, O. tetoriensis, O. trechmanni, O. danica, O. danica, O. danica, O. agrawali, O. censoriensis, O. ferrugineum, O. kashiwaiensis, O. multistriata, O. tetoriensis

Synonymy list

Year	Name and author
1819	Avicula inequivalvis Sowerby
1901	Oxytoma inaequivalve Waagen
1909	Oxytoma inaequivalvis Borissiak
1924	Oxytoma inaequivalve Krumbeck
1935	Oxytoma inequivalve Cox
1965	Oxytoma inequivalvis Cox
1990	Oxytoma inequivalvis Hollingworth et al. figs. Pl 4, fig 11
1998	Oxytoma (Oxytoma) inequivalvis Aberhan p. 95 figs. Pl 9, figs 8-14
2013	Oxytoma inequivalvis Paredes et al. figs. Pl 1, figs 19,20

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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)
infraclass	Pteriomorphia	(Beurlen 1944)

Rank	Name	Author
—	Ostreomorphi	Ferussac 1822
—	Ostreioni	Ferussac 1822
—	Ostreata	Ferussac 1822
superorder	Ostreiformii	Ferussac 1822
order	Pectinida	(Gray 1854)
suborder	Anomiidina	Gray 1854
—	Monotoidei	Waterhouse 2001
superfamily	Oxytomoidea	Ichikawa 1958
family	Oxytomidae	Ichikawa 1958
genus	Oxytoma	(Meek and Hayden 1865)
species	inequivalvis	(Sowerby 1819)

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.

†Oxytoma inequivalvis Sowerby 1819

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Diagnosis

No diagnoses are available

Measurements

part	N	mean	minimum	maximum	median	s.d.
valve height	2	11.5	6.80	19.4	13.1	8.87

Composition:

low Mg calciteg

Environment:

marineo

Locomotion:

stationaryg

Attached:

yesg

Life habit:

epifaunalg

Diet:

suspension feederg

Vision:

blindc

Created:

2007-10-05 04:22:50

Modified:

2009-04-13 13:15:35

Source: g = genus, o = order, c = class

References: Aberhan et al. 2004, Kiessling 2004

Age range: base of the Norian to the top of the Tithonian or 227.30000 to 143.10000 Ma

Collections (303 total)

Time interval	Ma	Country or state	Original ID and collection number
Oldest occurrences
Norian	227.3 - 205.7	Russian Federation (Primorskiy Kray)	Oxytoma inaequivalve (97859)
Norian - Rhaetian	227.3 - 201.4	Chile (Coquimbo)	Oxytoma inaequivalvis (206096)
Norian - Rhaetian	227.3 - 201.4	Indonesia (Timor)	Avicula inaequivalvis (205275)
Rhaetian	205.7 - 201.4	Austria (Gmunden)	Oxytoma inaequivalve (234040)
Rhaetian	205.7 - 201.4	Austria	Oxytoma inaequivalve (29095 29111) Oxytoma inequivalvis (27943 27944 27947 27969 28110 28112 115311 115319 115321 115322 115340 115342 115355)
Rhaetian	205.7 - 201.4	Slovakia	Oxytoma inaequivalvis (100046)
Rhaetian	205.7 - 201.4	Austria (Calcareous Alps)	Oxytoma inaequivalvis (38141)
Early/Lower Hettangian	201.4 - 199.5	Chile	Oxytoma inequivalvis (95556)
Hettangian	201.4 - 199.5	Greenland	Oxytoma inaequivalve (162102 162106 162108)
Late/Upper Hettangian	201.4 - 199.5	Canada (British Columbia)	Oxytoma inequivalvis (53411)
Youngest occurrences
Time interval	Ma	Country or state	PBDB collection number
Oxfordian	161.5 - 154.8	India	Oxytoma inequivalve (63529)
Oxfordian	161.5 - 154.8	Somalia	Oxytoma inequivalve (93001)
Oxfordian	161.5 - 154.8	Svalbard and Jan Mayen	Oxytoma inaequivalvis (212008)
Late/Upper Jurassic	161.5 - 143.1	Greenland	Oxytoma inequivalve (1197)
Oxfordian - Tithonian	161.5 - 143.1	Svalbard and Jan Mayen	Oxytoma inaequivalvis (212487)
Kimmeridgian	154.8 - 149.2	Svalbard and Jan Mayen	Oxytoma inaequivalvis (212014 212016)
Kimmeridgian	154.8 - 149.2	Tanzania	Oxytoma inequivalvis (35458)
Late/Upper Kimmeridgian	152.21 - 149.2	Tanzania	Oxytoma inequivalvis (36306)
Tithonian	149.2 - 143.1	Greenland	Oxytoma inequivalve (1199 1201 1203 1204 1210 1212 1214 1216 1218 1221 1228 1229 1230 1232 1237 1240 1242 1246 1249 1253 1258 1262 1270 1271 1272 1273 1407 1409 1458 1461 1462 1473)
Tithonian	149.2 - 143.1	Svalbard and Jan Mayen	Oxytoma inequivalve (212801)