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Hirnantia sagittifera

Rhynchonellata - Orthida - Draboviidae

Taxonomy

Synonyms
Synonymy list
YearName and author
1851Orthis sagittifera McCoy
1935Hirnantia sagittifera Lamont p. 313
1967Drabovia agnata Marek and Havlíček p. 279 figs. pl. 2 f. 7-8, 11-12, 19
1974Villicundella mozetici Levy and Nullo p. 178 figs. pl. 1, Fig. 1-9
1974Hirnantia magna Rong et al.
1982Hirnantia sagittifera Cocks pp. 763 - 764 figs. Plate 78, figs. 6-10; Plate 79, figs. 1-3; Plate 80, fig. 8
1983Hirnantia sagittifera fecunda Zeng p. 116 figs. pl. 14, Fig. 5-8
2006Hirnantia sagittifera Brenchley et al. p. 16 figs. 12A, C, F
2008Hirnantia sagittifera Jin and Zhan pp. 52-53 figs. Pl. 36, figs. 1-16
2012Hirnantia sagittifera Hints et al. pp. 67 - 70 fig. 2
2015Hirnantia sagittifera Hints and Harper
2016Hirnantia septumis Zeng et al. p. 72 figs. pl. 38, Fig. 1-12
2016Hirnantia fecunda Zeng et al. p. 74 figs. pl. 34 Fig. 6-12
2019Hirnantia sagittifera Rong et al. fig. 21A–K

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
Lophophorata
PanbrachiopodaCarlson and Cohen 2020
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classRhynchonellataWilliams et al. 1996
orderOrthidaSchuchert and Cooper 1932
suborderDalmanellidinaMoore 1952
superfamilyEnteletoideaWaagen 1884
familyDraboviidaeHavlicek 1950
subfamilyDraboviinaeHavlicek 1950
genusHirnantiaLamont 1935
speciessagittifera()

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.

Hirnantia sagittifera McCoy 1851
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Invalid names: Hirnantia agnata Marek and Havlíček 1967 [synonym], Hirnantia fecunda Zeng 1983 [synonym], Hirnantia magna Rong et al. 1974 [synonym], Hirnantia mozetici Levy and Nullo 1974 [synonym], Hirnantia septumis Zeng et al. 2016 [synonym]
Diagnosis
ReferenceDiagnosis
L. R. M. Cocks 1982Exterior. Biconvex, with convexity of brachial valve considerably greater than pedicle valve. Faint trace of very weak pedicle valve fold and corresponding brachial valve sulcus seen in a few valves only. Small anacline brachial valve interarea · and fairly small apsacline pedicle interarea. Open delthyrium with small pedicle collar and open notothyrium. Relatively fine radial ornament (84 ribs counted at 10 mm growth line on BB 93984, PI. 79, fig. 2), with new costellae arising both by bifurcation and intercalation, the costellae curving round laterally to merge with the hinge line. Growth lines obscure, except anteriorly in old specimens.

Pedicle valve interior. Teeth supported by dental plates extending to the valve floor and diverging at right angles, merging antero-Iaterally with the variably developed muscle-bounding ridges. Thin lanceolate adductor muscle scars between well-impressed anteriorly rounded diductor muscle scars, the whole muscle field bilobed, and extending anteriorly for about one-third of the valve length. Vascular markings obscure.

Brachial valve interior. Cardinal process small, simple (PI. 79, figs. 1,3), becoming stronger and more bulbous in the most gerontic specimens (PI. 78, fig. 9). Pair of stout but relatively short socket plates (the 'supporting plates' of Temple 1965, p. 400) diverging at right angles and attached to the valve floor. Variably developed, poorly defined, thin and low median septum extends for up to one-third of the valve length. Adductor muscle field weakly impressed, but each muscle scar is subcircular and extends anteriorly from between one-quarter and one-third of the valve length.