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Rhipidomena tennesseensis

Strophomenata - Strophomenida - Strophomenidae

Taxonomy
Strophomena tennesseensis was named by Willard (1928). It is the type species of Rhipidomena.

It was recombined as Rhipidomena tennesseensis by Cooper (1956).

Synonymy list
YearName and author
1928Strophomena tennesseensis Willard p. 285 figs. pl. 2, figs. 17, 18,
1956Rhipidomena tennesseensis Cooper pp. 870 - 872 figs. Plate 252, A, figures 1-5; plate 252, B, figures 6-14; plate 253, A, figures 1-14

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
Lophophorata
PanbrachiopodaCarlson and Cohen 2020
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyStrophomenidaeKing 1846
subfamilyStrophomeninaeKing 1846
genusRhipidomena
speciestennesseensis(Willard 1928)

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.

Rhipidomena tennesseensis Willard 1928
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Diagnosis
ReferenceDiagnosis
G. A. Cooper 1956Shell large for the genus, varying in outline from nearly quadrate to semielliptical. Cardinal extremities deflected toward the brachial valve varying from a right angle to alate. Hinge equal to or greater than the width at the middle. Lateral margins varying from nearly straight to oblique to greatly rounded. Anterior margin narrowly to broadly rounded. Surface ornamented by fine radiating costellae of 2 sizes, i or 2 costellae separating the larger ones. On the lateral slopes, particularly anterior to the cardinal extremities, the costellae become fairly uniform in size. Finer radii increasing in size toward the anterior margin and tending toward uniformity in size along the margin. At the front margin of a specimen 33 mm. long, 25 costellae may be counted in 5 mm., but in a specimen measuring 46 mm. in length, only 16 costellae were counted in the same distance. Entire surface covered by fine concentric fila, about 8 or 9 in a millimeter at about the middle, becoming more crowded toward the front. Hinge region may or may not be marked by a few oblique wrinkles.

Adult pedicle valve with posterior half gently swollen and with gentle slopes; anterior half moderately strongly geniculated toward the pedicle valve ; geniculation of lateral portions more gentle. Angle of geniculation between 105° and 130°. Beak inconspicuous; foramen small, elongated, often at the anterior of a short groove. Interarea moderately long, apsacline. Pseudodeltidium low and inconspicuous.

Posterior half of brachial valve flattened, gently concave at the umbo ; anterior slope moderately steep ; lateral slopes steeper than the anterior one. Umbonal region sulcate, sulcus wide and shallow, extending nearly to middle of valve. I

nterior : Muscle area of pedicle valve broadly cordate ; diductor scars flabellate, separated by 2 low ridges. Adductor scars elongate elliptical in outline, located somewhat posterior to the middle of the muscle area. Delthyrial chamber filled by callus that is extended forward as far as the posterior ends of the adductor impressions.
Measurements
No measurements are available
Composition: low Mg calcitep
Entire body: yesf
Adult length: 10 to < 100f
Adult width: 10 to < 100f
Environment: marineuc
Locomotion: stationaryo
Attached: yesp
Life habit: epifaunalo
Diet: suspension feedero
Vision: blindc
Created: 2009-06-11 19:20:40
Modified: 2009-06-11 21:20:40
Source: f = family, o = order, c = class, p = phylum, uc = unranked clade
References: Hendy 2009, Aberhan et al. 2004, Nesnidal et al. 2013

Age range: Caradocian or 460.90000 to 449.50000 Ma

Collections (33 total)


Time interval Ma Country or state Original ID and collection number
Ashbyan460.9 - 449.5USA (Virginia) Strophomena tennesseensis (33938 33980 33981 33982 33983 33984 33995 33996 33997)
Ashbyan460.9 - 449.5USA (Tennessee) Rhipidomena tennesseensis (203279)
Caradoc460.9 - 449.5USA (Georgia) Strophomena tennesseensis (33174 33175 33177 33179 33182 33186 33188)
Caradocian460.9 - 449.5USA (Virginia) Rhipidomena tennesseensis (37904) Strophomena tennesseensis (33934 33935 33936 33937 34007 34028 34029 34030 34031 34032 34152 34153 34167 34168 34169)