PBDB Taxon

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Nuculana cowlitzensis

Bivalvia - Nuculanida - Nuculanidae

Taxonomy

Leda cowlitzensis was named by Weaver and Palmer (1922). Its type specimen is UW (unknown number), a shell, and it is a 3D body fossil. Its type locality is UW 329, which is in a Bartonian marine horizon in the Cowlitz Formation of Washington.

It was recombined as Nuculana cowlitzensis by Turner (1938).

Synonymy list

Year	Name and author
1922	Leda cowlitzensis Weaver and Palmer p. 6 figs. pl. 10, fig. 4
1938	Nuculana cowlitzensis Turner p. 42

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

Rank	Name	Author
—	Eubivalvia
subclass	Protobranchia	(Pelseneer 1889)
superorder	Nuculaniformii	Carter et al. 2000
order	Nuculanida	(Carter et al. 2000)
superfamily	Nuculanoidea	Adams and Adams 1858
family	Nuculanidae	Adams and Adams 1858
genus	Nuculana	Link 1807
species	cowlitzensis	()

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.

†Nuculana cowlitzensis Weaver and Palmer 1922

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Diagnosis

Reference	Diagnosis
C. E. Weaver and K. Palmer 1922	Shell small and thin, sub-oval in outline ; posterior end rostrate and pointed ; anterior end regularly and broadly rounded, ventral margin curved, posterior end sloping at an angle of 30 to the ventral line terminating at the dorsal margin in a beak; posterior dorsal margin directed downward and concave; lunule narrow and elongate, only slightly impressed and limited by a fine line ; escutcheon narrow and impressed ; surface ornamented with concentric ribbing which continues from the anterior margin, regularly to the rostrum, the ribs are numerous with only slight interspaces, they are prominent and have the appearance of slightly overlapping each other from the ventral region toward the ambones ; a faint groove extends from the beaks to the posterior point of the ventral margin, just back of which the concentric sculpture is somewhat obliterated except for faint lines of growth.