PBDB Taxon

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

Anadara (Anadara) mediaimpressa

Bivalvia - Arcida - Arcidae

Taxonomy

Arca (Scapharca) mediaimpressa was named by Clark (1918). Its type specimen is UCMP 11174 and is a 3D body fossil. Its type locality is UCMP loc. 1131, Walnut Creek, which is in an Oligocene marine horizon in California.

It was recombined as Anadara (Anadara) mediaimpressa by Reinhart (1943), Moore (1983).

Subspecies

Anadara (Anadara) mediaimpressa mediaimpressa

Sister species lacking formal opinion data

A. burnesi, A. chilensis, A. clathrata, A. dameyi, A. delandensis, A. hypomela, A. improcera, A. larkini, A. natalensis, A. philippiana, A. rectangularis, A. setoensis, A. tarponensis, A. turoniensis, A. watanabei, A. mompiche, A. microtera, A. kogachiensis, A. chavezi, A. guajirensis, A. suzukii, A. tectumcolumbae, A. veatchi, Arca montensis

Synonymy list

Year	Name and author
1918	Arca (Scapharca) mediaimpressa Clark pp. 126 - 127 figs. pl. 7, figs. 7, 8
1943	Anadara (Anadara) mediaimpressa Reinhart p. 39 figs. PI. 4, figs, 1, 5, 6
1983	Anadara (Anadara) mediaimpressa Moore pp. A38 - A39 figs. Piate 7, figures 2, 3

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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	Pteriomorphia	(Beurlen 1944)
—	Ostreomorphi	Ferussac 1822
—	Arcioni	Gray 1854
order	Arcida	(Stoliczka 1871)
superfamily	Arcoidea	(Lamarck 1809)
family	Arcidae	Lamarck 1809
subfamily	Anadarinae	Reinhart 1935
genus	Anadara	Gray 1847
subgenus	Anadara	Gray 1847
species	mediaimpressa	()

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.

†Anadara (Anadara) mediaimpressa Clark 1918

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Anadara (Anadara) mediaimpressa mediaimpressa Clark 1918

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Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

aragonitef

Entire body:

yesf

Adult length:

10 to < 100f

Adult width:

10 to < 100f

Adult height:

10 to < 100f

Thickness:

intermediatef

Folds:

minorf

Ribbing:

majorf

Spines:

nonef

Internal reinforcement:

nonef

Ontogeny:

accretionf

Environment:

lagoonal, coastal, inner shelf, outer shelf, oceanic, brackish, freshwaterf

Locomotion:

facultatively mobileg

Attached:

yesf

Life habit:

semi-infaunalg

Diet:

suspension feederg

Vision:

limitedf

Created:

2009-09-09 13:20:13

Modified:

2009-09-09 15:20:13

Source: g = genus, f = family

References: Mikkelsen and Bieler 2008, Sanchez Roig 1926

Age range

Maximum range based only on fossils: Late/Upper Oligocene or 27.30000 to 23.04000 Ma
Minimum age of oldest fossil (stem group age): 23.04 Ma

Collections (2 total)

Time interval	Ma	Country or state	Original ID and collection number
Chattian	27.3 - 23.04	Mexico (Baja California Sur)	Arca mediaimpressa (43805)
Late/Upper Oligocene	27.3 - 23.04	USA (California)	Arca mediaimpressa (122273)