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Mytilarca parens

Bivalvia - Myalinida - Ambonychiidae

Taxonomy
Mytilus parens was named by Barrande (1881). Its type specimen is NM L 21385, a shell (left valve), and it is a 3D body fossil.

It was recombined as Mytilarca parens by Kříž (2008).

Synonymy list
YearName and author
1881Mytilus parens Barrande figs. pl. 210 f. II/1 (not f. II/2–13); pl. 284 f. 22-23
2008Mytilarca parens Kříž pp. 250 – 252 fig. 5L–R

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
Schizocoela
phylumMollusca
classBivalvia
Eubivalvia
subclassAutobranchia(Groblen 1894)
RankNameAuthor
infraclassPteriomorphia(Beurlen 1944)
OstreomorphiFerussac 1822
OstreioniFerussac 1822
MyalinataPaul 1939
orderMyalinidaPaul 1939
superfamilyAmbonychioidea(Miller 1877)
familyAmbonychiidaeMiller 1877
genusMytilarca
speciesparens()

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
J. Kříž 2008Upper Wenlock and lower Ludlow Mytilarca with regular flat and wide growth bands and narrow furrows.

Medium size (L = 13.8–36.7;H= 15.6–45.5), mytiliform, equivalved, inequilateral, and obese shells lacking an anterior lobe. Umbones are in extreme terminal position, beaks prosogyrate. Outer surface sculpture consists of growth wrinkles and of regular flat and wide growth bands and narrow furrows. Byssal sinus weak, no byssal gape developed. Ligament external, ligament area with numerous fine duplivincular grooves and ridges. Hinge in the left valve is composed of at least three oblique cardinal teeth just behind umbo. Shell thickness is 0.13–0.5 mm.