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Orthorhynchula linneyi

Rhynchonellata - Rhynchonellida - Orthorhynchulidae

Taxonomy
Orthis linneyi was named by James (1881) [Orthis? linneyi].

It was recombined as Orthorhynchula linneyi by Howe (1979).

Synonymy list
YearName and author
1881Orthis linneyi James p. 41
1979Orthorhynchula linneyi Howe pp. C10 - C13 figs. Plate 4, figures 11-18; plate 5, figure 7; plate 6, figures 1-15; plate 7, figures 1-4

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RankNameAuthor
kingdomAnimalia()
Triploblastica
Eutriploblastica
Neotriploblastica
Eucoelomata
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderRhynchonellidaKuhn 1949
superfamilyRhynchotrematoideaSchuchert 1913
familyOrthorhynchulidaeCooper 1956
genusOrthorhynchula
specieslinneyi(James 1881)

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
H. J. Howe 1979Shell subtriangular to occasionally subelliptical in outline; apical angle slightly more than 90°; sides broadly rounded; valves subequal in depth, the brachial valve deeper and showing greatest width at the middle; width somewhat exceeding length; hinge line short, averaging somewhat less than half of the shell width. Surface costate, ornamented with 3 costae in sulcus, 4 on the fold, and 7 to 13 on the flanks.

Pedicle valve gently to moderately convex in in lateral profile, displaying the greatest convexity between the umbo and the middle of the valve. Umbo swollen with moderately steep sides; flanks gently inflated. Sulcus originating in front of umbo and forming a mesial depression that increases in width to about one-half the shell width at the front. Interarea of pedicle valve short but well defined, averaging somewhat less than one-half the shell width; delthyrium large, open, with small apical foramen usually present through beak resorption.

Brachial valve moderately to strongly convex in lateral profile, displaying the greatest curvature in the posterior half. Umbo inflated, merging anteriorly with a fold which bears four costae, the lateral pair of which are weaker and lower than the median costae; fold becoming moderately elevated at the front and occupying about one-half the valve width. Flanks moderately convex. Dorsal interarea smaller than the ventral one and varying from about four- , tenths to one-half the valve width.