Neithea occidentalis Conrad, 1855
CONRAD, T. A. 1855. Descriptions of one Tertiary and eight New Cretaceous Fossils from Texas, in the Collection of Major Emory. Proceedings of the Academy of Natural Sciences of Philadelphia, 7: 268-269. [p. 269]
1855 Neithea occidentalis Conrad, 1855
1894 Vola fredericksburgensis Crangin, 1894
1894 Vola fredericksburgensis Crangin, 1894
Pecten quadricostatus Sowerby var.; C. F. Roemer, 1852, Die Kreidebildungen von Texas und ihre organischen Einschluesse, plate 8, figures 4a-4c.
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«Neithea occidentalis.— Ovato-triangular, ansulated; lower valve inflated, unequally ribbed and concentrically lined, lines very fine; large ribs five, rounded and elevated; smaller ribs equal, two in number in each of the intervals between the larger ribs, which latter have on each side a raised line or fine rib, giving it a trifid character; right valve flat, subconcave.
Pecten quadricostatus, var. Roemer. Kreid von Texas, p. 64, pl. 8, fig. 4. This species differs from N. quadricostata in having but two equal ribs between the larger ones, whilst that species has three corresponding ribs, and it is also proportionally a narrower or more elevated shell. There is quite as much difference between the two as between N. quadricostata and N. quinquecostata.» TIMOTHY ABBOT CONRAD, 1855
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«Dhondt (1973) did not mention N. occidentalis Conrad, a species that also belongs to this group of North American taxa. In his original description of that species, Conrad (1855) emphasized the ‘trifid character’ of the principal ribs, which is produced by a raised line or fine rib on the flanks of the principal ribs. In this respect Conrad’s species falls within the concept of N. alpina, as noted by Hayami (1965), who placed it in his N. ficalhoi group. According to Dhondt (personal communication), N. alpina and N. occidentalis are probably distinct species, and the latter a synonym of N. syriaca Conrad, 1852. However, judging from the original descriptions and the discussion by Dhondt (1973), N. syriaca differs from N. alpina by the absence of tripartite principal ribs, its four unequal intercalary ribs, and the smoothness of its areas and auricles.»
ANDRADE, E. DE J., J. SEELING, P. BENGSTON & W. SOUZA-LIMA. 2004. The bivalve Neithea from the Cretaceous of Brazil. Journal of South American Earth Sciences, 17: 25-38, figs. 1-4. [p. 33]
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«Locality and position: This species is one of the most common and widely distributed Pectens of the Fredericksburg group, especially of the Comanche Peak limestone. It occurs sparingly in the Walnut clay and the Edwards limestone, and in some areas it also ranges both below and above the limits of the Fredericksburg group. In the Quitman Mountains of western Texas many specimens of the angular variety were collected in the Quitman formation of Taff of the Trinity group; one of these is shown on plate 27, figure 4. It was also collected in the Glen Rose limestone at several localities in the Austin region, Tex.
Roemer's type came from the neighborhood of Fredericksburg in Gillespie County, Tex., probably from the Comanche Peak limestone. The smaller of the typical specimens here figured (see pl, 27, figs. 2, 3) is from the Comanche Peak limestone & miles northeast of Kerrville in Kerr County, and the large one is from the same formation at Benbrook in Tarrant County (see pl. 27, fig 1). In the central Texas area the species has not been seen in the Kiamichi formation, but it occurs in that formation at Kent in Culberson County and in west Texas. It also occurr in the Purgatoire formation near Mesa Tucumcari, N. Mex., and in the tower part of the Kiowa shale near Belvidere, Kans.» STANTON, T. W. 1947. Studies of some Comanche pelecypods and gastropods. United States Geological Survey Professional Paper, 211: 1-256, pls. 1-67. [p. 44]
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Pecten (Neithea) occidentalis (Conrad); T. W. Stanton, 1947, 1947, Studies of some Comanche pelecypods and gastropods, plate 27, figures 1-4.
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