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Rhipidomena

Strophomenata - Strophomenida - Strophomenidae

Taxonomy
Rhipidomena was named by Cooper (1956) [Sepkoski's age data: O Llde O Cara-l Sepkoski's reference number: 1,397]. It is not extant. Its type is Strophomena tennesseensis.

It was assigned to Strophomenidae by Cooper (1956); to Rafinesquininae by Williams et al. (2000); to Strophomenida by Sepkoski (2002); and to Strophomeninae by Congreve et al. (2019).

Synonymy list
YearName and author
1956Rhipidomena Cooper pp. 866 - 867
2000Rhipidomena Williams et al. p. 241
2002Rhipidomena Sepkoski
2019Rhipidomena Congreve et al. p. 273

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RankNameAuthor
kingdomAnimalia()
Bilateria
EubilateriaAx 1987
Protostomia
Spiralia
superphylumLophotrochozoa
Lophophorata
phylumBrachiopodaCuvier 1805
RankNameAuthor
subphylumRhynchonelliformeaWilliams et al. 1996
classStrophomenataWilliams et al 1996
orderStrophomenidaOpik 1934
superfamilyStrophomenoideaKing 1846
familyStrophomenidaeKing 1846
subfamilyStrophomeninaeKing 1846
genusRhipidomena

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.

G. †Rhipidomena Cooper 1956
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Rhipidomena mesleri Cooper 1956
Rhipidomena subparallela Cooper 1956
Rhipidomena tennesseensis Willard 1928
Rhipidomena tenuitesta Willard 1928
Diagnosis
ReferenceDiagnosis
G. A. Cooper 1956Shells generally large, attaining a length of about 2 inches and a width of nearly 2.5 inches ; generally wider than long, usually somewhat parallel sided cardinal extremities subrectangular to subauriculate ; convexi-concave in the adult but concavo-convex when young; anterior commissure rectimarginate. Surface finely costellate, strong and fine costellae alternate and appear in several generations; entire surface covered by fine concentric fila. Pseudopunctae finely and densely matted.

Pedicle valve with minute pedicle foramen, pseudodeltidium of moderate size and convexity; teeth small, surface smooth or roughened, supported by callus thickening ; muscle area large, occupying about half the valve area ; diductor scars broad and flabellate ; adductor scars small, located at about the middle of the muscle field on 2 low, subparallel ridges that extend anteriorly to about the valve middle where the diductors end. Posterior of delthyrial cavity filled by adventitious shell. Anterior and lateral margins with thickened inner rim.

Brachial interior with thickened notothyrial platform bearing 2 stout lobes of the cardinal process having short shafts and flat myophore surfaces. Brachiophores visible as short, flat blades on the inner side of the sockets and nearly buried by adventitious shell material. Median ridge short and low ; adductor field marked by 4 short radiating ridges, 2 on each side of the median ridge ; moderately thickened rim just inside margins, but not so prominent as that of the pedicle valve.
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: base of the Early/Lower Llanvirn to the top of the Katian or 466.00000 to 445.20000 Ma

Collections (54 total)


Time interval Ma Country or state Original ID and collection number
Whiterockian - Ashbyan471.8 - 449.5USA (Virginia) Strophomena tenuitesta (33530)
Middle Ordovician470.0 - 458.4USA (Tennessee) R. sp. (319)
Chazyan468.1 - 460.9USA (Virginia) R. subparallela (186172 203292)
Chazyan468.1 - 460.9USA (Tennessee) R. sp. 1 (164884)
Early/Lower Llanvirn466.0 - 463.5China (Yunnan) R. sp. (5423)
Llandeilo466.0 - 449.5Mongolia R. fillocostellata (45985)
Ashbyan460.9 - 449.5USA (Virginia) R. tenuitesta (203290) Strophomena tennesseensis (33938 33980 33981 33982 33983 33984 33995 33996 33997) Strophomena tenuitesta (33544 33545 33546 33547 33548)
Ashbyan460.9 - 449.5USA (Tennessee) R. mesleri (203285) R. tennesseensis (203279) R. tenuitesta (203289 219873)
Blackriveran460.9 - 449.5USA (Tennessee) R. fillocostellata (203291) R. mesleri (203288)
Caradoc460.9 - 449.5USA (Georgia) Strophomena tennesseensis (33174 33175 33177 33179 33182 33186 33188)
Caradocian460.9 - 449.5USA (Virginia) R. tennesseensis (37904) Strophomena tennesseensis (33934 33935 33936 33937 34007 34028 34029 34030 34031 34032 34152 34153 34167 34168 34169)
Katian453.0 - 445.2Kazakhstan R. sp. (204092)
Ashgill449.5 - 443.7Canada (Quebec) R. sp. (12063)
Ashgill - Llandovery449.5 - 433.4Canada (Qu├ębec) R. sp. (24454)