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Craigella

Strophomenata - Orthotetida - Triplesiidae

Taxonomy
Craigella is a genus. It is not extant.

It was assigned to Triplesiidae by Williams et al. (2000); and to Orthida by Sepkoski (2002).

Synonyms
Synonymy list
YearName and author
1962Epacroplecia Williams p. 155
1977Epacroplecia Mitchell
2000Craigella Williams et al. p. 685
2002Craigella Sepkoski, Jr.
2002Nucleorhynchia Sepkoski, Jr.

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderOrthotetidaWaagen 1884
suborderTriplesiidinaMoore 1952
superfamilyTriplesioideaSchuchert 1913
familyTriplesiidaeSchuchert 1913
genusCraigella

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
A. Williams 1962 (Epacroplecia)Trigonal, unequally biconvex triplesiaceids with a highly convex, trilobate brachial valve and a shallow pedicle valve geniculated to form a median tongue complementary to the inflated median fold and lateral flanks of the brachial valve; hinge-fine very short; dorsal interarea vestigial, "chilidium" short, obtusely triangular, situated astride the posterior face of the cardinal process shaft; ventral interarea of variable length almost orthocline, pseudodeltidium entire with narrow median fold, foramen large, apical; ornamentation consisting of fine, sharp, striate-like costellae with inconspicuous concentric growth-lines, shell substance impunctate but with scattered subcircular knots of fibrous calcite occurring in the inner layer and appearing rarely at the surface as indistinct tubercles.

Dorsal interior with a massive cardinal process shaft bifurcated distally, sockets rather deep, situated lateral to a pair of strong, blade-like, subparallel brachiophores disposed normal to the hinge-line and ankylosed to it as well as to the postero-median portion of the valve floor; muscle-field obscurely impressed but associated with 4 subparallel septa symmetrically placed on either side of the median fold, with the outer pair the longer.

Ventral interior with massive teeth supported by long, narrowly divergent dental lamellae; musclefield probably extending anteriorly to the ends of the dental lamellae and divided antero-medianly by a low narrow ridge.