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Arca (Barbatia) suzzalloi

Bivalvia - Arcida - Arcidae

Synonymy list
YearName and author
1922Arca (Barbatia) suzzalloi Weaver and Palmer p. 8 figs. pl. 8, fig. 6

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
classBivalvia
Eubivalvia
subclassAutobranchia(Groblen 1894)
RankNameAuthor
infraclassPteriomorphia(Beurlen 1944)
OstreomorphiFerussac 1822
ArcioniGray 1854
orderArcida(Stoliczka 1871)
superfamilyArcoidea(Lamarck 1809)
familyArcidaeLamarck 1809
genusArcaGray 1842
subgenusBarbatia
speciessuzzalloi

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 small, elongate in outline; inequilateral, beaks situated
one-third the distance from the anterior end ; dorsal margin straight ; anterior
end nearly straight, sloping at about an angle of 15 with the dorsal margin,
passing into the ventral margin with a broad bow ; ventral margin straight,
produced obliquely ; posterior margin broadly pointed at the ventral end, sloping
to the dorsal margin at about an angle of 40 ; a mid-umbonal sulcus extends to
the ventral margin, sloping obliquely from the beaks ; surface sculptured by concentric
lines of growth crossed by numerous fine, delicate, radiating ribs which
bifurcate, forming two ribs of equal width on the lower region. The bifurcation
of the ribs occurs over the whole of the shell including the posterior as well
as the anterior region of concaveness. Under the microscope these ribs show
a beaded character, which are most numerous on the anterior, umbonal slope;
cardinal area very narrow.