PBDB Taxon

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

Spisula (Spisula) williamsi

Bivalvia - Venerida - Mactridae

Taxonomy

Spisula (Spisula) williamsi was named by Berry (1960). It is extant.

Sister species lacking formal opinion data

Mactra asperaeformis, Mactra polynyma, Mactra snatolensis, Mactra xenophonti, S. addicotti, S. albaria, S. albaria, S. albirupina, S. amekiensis, S. bisculpurtata, S. californica, S. catiliformis, S. chulgunensis, S. coosensis, S. cutirostrata, S. eugenense, S. funerata, S. hanniballi, S. inaequilateralis, S. incrassata, S. merriami, S. mississippiensis, S. modicella, S. ochotensis, S. onnechiuria, S. ovalis, S. packardi, S. rushi, S. solida, S. solidissima, S. subtruncata, S. tigilensis, S. trangulata, S. triangulata, S. aequilatera, S. aequilaterala, S. densa, S. dodona, S. modicella, S. modicella, S. grayana, S. matleyi, S. onnechiuria, S. densata, S. evalensis, S. ezodensata, S. ikusaensis, S. panzana, S. sachalinensis, S. hauitaca, S. inaequilatera, S. subtruncata, S. couttsi

Entered

by J. Marcot on 2026-04-20; modified by J. Marcot on 2026-04-20

Synonyms

Spisula adamsi was named by Olsson (1961). It is extant.

It was synonymized subjectively with Spisula (Spisula) williamsi by Signorelli (2019).
Simomactra hoffstetteri was named by Cauquoin (1969). It is extant.

It was synonymized subjectively with Spisula (Spisula) williamsi by Signorelli (2019).

Synonymy list

Year	Name and author
1960	Spisula (Spisula) williamsi Berry
1961	Spisula adamsi Olsson p. 326
1969	Simomactra hoffstetteri Cauquoin p. 1021
2019	Spisula (Spisula) williamsi Signorelli pp. 51-52 figs. 3.4c-h

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Protostomia
—	Spiralia
superphylum	Lophotrochozoa
phylum	Mollusca
class	Bivalvia
subclass	Autobranchia	(Groblen 1894)
infraclass	Heteroconchia	(Gray 1854)

Rank	Name	Author
—	Euheterodonta	Giribet and Distel 2003
superorder	Imparidentia	Bieler 2014
—	Neoheterodontei	Taylor et al. 2007
order	Venerida	(Gray 1854)
superfamily	Mactroidea	(Lamarck 1809)
family	Mactridae	Lamarck 1809
subfamily	Mactrinae	Lamarck 1809
genus	Spisula	Gray 1837
subgenus	Spisula	Gray 1837
species	williamsi	Berry 1960

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.

Spisula (Spisula) williamsi Berry 1960

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Invalid names: Simomactra hoffstetteri Cauquoin 1969 [synonym], Spisula adamsi Olsson 1961 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

aragonitec

Locomotion:

facultatively mobileg

Life habit:

infaunalg

Diet:

suspension feederg

Vision:

blindc

Created:

2009-09-09 14:12:34

Modified:

2009-09-09 16:12:34

Source: g = genus, c = class

References: Aberhan et al. 2004, Sanchez Roig 1926

Collections

No collection or age range data are available