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Rhynchotreta ardmillanensis

Rhynchonellata - Rhynchonellida - Trigonirhynchiidae

Taxonomy
Rhynchotreta ardmillanensis was named by Reed (1917) [Davidson in Reed 1917 = Rhynchonella cuneata, Dalman ?, Davidson 1883. (pars), Man. Brit. Foss. Brack., vol. v, Silur. Suppl., p. 152, pi. x, figs. 9, 9a, 96, non fig. 10 (non Rh. cuneata, Davidson, op. tit., vol. iii, p. 164, pl. xxi, figs. 7-11). = ? 1883. Rhynchonella Weaverii, ibid., p. 158,, pi. x, fig. 24. Non 1868. Rhynchonella Weaveri, Davidson, op. nit., vol. iii, p. 185, pi. xxiv f. 14].

It was recombined as Rostricellula ardmillanensis by Williams (1962) and Candela and Harper (2014).

Sister species lacking formal opinion data
R. cabotensis, R. lepida

Synonymy list
YearName and author
1917Rhynchotreta ardmillanensis Reed pp. 941 - 942 figs. Plate XXIV, figs. 8-16, non fig. 17
1962Rostricellula ardmillanensis Williams pp. 237 - 239 figs. Pl. XXIV, figs. 27-30; P1. XXIV, figs. 35, 37, 38
2014Rostricellula ardmillanensis Candela and Harper pp. Supplement 1

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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
orderRhynchonellidaKuhn 1949
superfamilyRhynchotrematoideaSchuchert 1913
familyTrigonirhynchiidaeMcLaren 1965
subfamilyVirginiatinaeAmsden 1974
genusRhynchotretaHall 1879
speciesardmillanensis

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.

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Diagnosis
ReferenceDiagnosis
A. Williams 1962Acutely cuneiform, gently rounded anteriorly and equally biconvex Rostricellula with a steep anterior margin and a rectimarginate commissure; brachial valve over four-fifths as wide as long, each valve about one-third as deep as the maximum width of the shell; costae fine and sharp with a wavelength of just less than 0.7 mm. at 7.5 mm. anterior to the dorsal umbo, originating at just over 2 mm. from the umbo and commonly numbering 13 in brachial valves about 5 mm. long; dental lamellae subparallel and well developed, extending anteriorly for about one-fifth of the length of adult pedicle valves, dorsal median septum strong and over one-half as long as the brachial valve.