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Plicatula juncalensis
Taxonomy
Plicatula juncalensis was named by Squires (1987). Its type specimen is LACMIP 7513 and is a 3D body fossil. Its type locality is CSUN loc. 362, west side of Canton Canyon, which is in a Ypresian marine horizon in the Juncal Formation of California.
Sister species lacking formal opinion data
P. auricola, P. clarki, P. costata, P. eroessa, P. follis, P. freneixae, P. gurgitis, P. himalayensis, P. hydrotheca, P. incongrua, P. kobyi, P. laevigata, P. lepidota, P. oceani, P. oepybolis, P. periobricata, P. pustula, P. radiola, P. renniei, P. reynesi, P. sinaiensis, P. sinnbishris, P. somarisensis, P. sudrensis, P. weymouthiana, P. lexoviensis
Synonymy list
| Year | Name and author |
|---|---|
| 1987 | Plicatula juncalensis Squires p. 57 figs. 95, 96 |
| 1997 | Plicatula juncalensis Squires and Saul p. 295 |
| 2020 | Plicatula juncalensis Hendy |
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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.
†Plicatula juncalensis Squires 1987
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| R. L. Squires 1987 | Generic assignment based on ostreiform shape, equiva lved and inequilateral shell, attached right valve (beak area), short hinge with two small teeth on each side of a shallow resilium pit , internally tuberculate valve margins , and external ornamentation of bifurcating radial ribs. Spe- cific assignment based on scaly-nodose secondary radial ribs in interspaces between primary radial ribs.
Plicatula juncalensis new species is most similar to Pli- catula parisien s is Deshayes ( 1864:87 , pl. 80 , figs. 5-7 ; Coss- mann and Pissarro , 1904-1906:pl. 41, fig. 133-6) from mid- dle and upper Eocene strata (Lutetian and Bartonian stages) of th e Paris Basin , France (Chedeville , 1902:229). According to Chedeville (I902:229) , P. parisiensis = P. condylus De- shayes (1864:88, pl. 80, figs. 11-13), and Cossmann and Pissarro (1904-1906:pl. 41, fig. 133-6') considered P. con- dy/us to be a variety of P. parisiensis. Plicatula juncalensis new species differs from examined specimens of P . parisiensis (regarded as synonymous with P. condylus in this present report) in the following features: presence of scaly-nodose (beaded appearance) secondary radial ribs in interspaces be- tween primary radial ribs , less elevated primary radial ribs, four more primary radial ribs on right valve, and absence of spines on primary radial ribs along valve margin. Plicatula juncalensis new species is similar to Plicatula filamentosa p!anata Meyer and Aldrich (1886:45, pl. 2, fig. 20; Dockery , 1980:pl. 23, fig. 6; pl. 48 , figs. 1-3) from middle Eocene strata of Mississippi and Louisiana (Palmer and Brann, 1965). Plicatula juncalensis differs from P.filamentosa pla- nata in the following features: shell more oblique, unequal number of primary radial ribs, and an absence of spines. Plicatula ostreiformis Stanton (I 896: I038, pl. 63, figs. 5, 6) is the only other reported species of Plicatula from the West Coast Tertiary , and it is from Paleocene strata of Lake County, northern California. Plicatulajuncalensis new species differs greatly from P. ostreiformis in the following features: shell more oblique and not as thick or as large, left valve not concave in the middle, and sculpture much more strongly developed. |
Measurements
No measurements are available
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| Source: g = genus, o = order, c = class | |||||
| References: Kiessling 2004, Sanchez Roig 1926, Aberhan et al. 2004 | |||||