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Arca columbiana

Bivalvia - Arcida - Arcidae

Synonymy list
YearName and author
1922Arca columbiana Weaver and Palmer p. 8 figs. pl. 8, fig. 1

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
classBivalvia
Eubivalvia
RankNameAuthor
subclassAutobranchia(Groblen 1894)
infraclassPteriomorphia(Beurlen 1944)
OstreomorphiFerussac 1822
ArcioniGray 1854
orderArcida(Stoliczka 1871)
superfamilyArcoidea(Lamarck 1809)
familyArcidaeLamarck 1809
genusArca
speciescolumbiana

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.

Diagnosis
ReferenceDiagnosis
C. E. Weaver and K. Palmer 1922Shell large and rectangular in outline ; nearly equilateral ; beaks
prominent, umbonal area broad ; hinge line straight ; cardinal area narrow ; dorsal
line sloping slightly from the beaks ; anterior end rounded, passing into the
ventral margin with a curve ; ventral margin only slightly curved, extending
abruptly into the posterior end ; posterior end straight ; posterior end is more
flaring and concave than the anterior end ; there is a tendency for a slight
umbonal ridge to extend from the beaks to the posterior ventral margin ; shell
ornamented with 22 flat-topped, wide, very prominent radiating ribs with interspaces
nearly equal to the width of the ribs.