Atresius liratus Gabb, 1869
publication ID |
https://doi.org/ 10.4202/app.2008.0412 |
persistent identifier |
https://treatment.plazi.org/id/03DC9B54-FFE8-3376-FC85-42117EABC8E0 |
treatment provided by |
Felipe |
scientific name |
Atresius liratus Gabb, 1869 |
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Fig. 8A–F View Fig .
1869 Atresius liratus sp. nov.; Gabb 1869: 169, pl. 28: 50.
1894? Atresius liratus Gabb (?); Diller and Stanton 1894: 442.
1895 Atresius liratus Gabb ; Stanton 1895: 68–69, pl. 11: 6.
1906 Atresius liratus Gabb ; Cossmann 1906: 193, fig. 19.
1927 Atresius liratus Gabb ; Stewart 1927: 426, pl. 23: 3.
1938 Atresius liratus Gabb ; Wenz 1938: 893, fig. 2627.
2006 Atresius liratus of Stanton, 1895; Campbell 2006: 382, fig. 6F.
Material.— Two specimens ( USNM 23075 About USNM a, b) figured by Stanton (1895) from Wilbur Springs (site 5) and numerous specimens from Rocky Creek (site 7) .
Description.—Protoconch unknown. Teleoconch fusiform, moderately high spired, up to five whorls, apical angle 35– 40°; suture distinct, deeply incised; whorls almost flat−sided, slightly convex, or angular, often with steep shoulder, basal margin strongly angular to rounded; sculpture consists of four to eight spiral cords, uppermost one at edge of shoulder, lowermost at basal margin, these two are usually strongest, interspaces between cords two to three times as wide as cords; spirals are crossed by dense, opisthocyrt growth lines of variable strength, in few specimens growth lines develop into axial ribs of same strength as spiral cords; base with seven to ten spirals of various strength, sometimes with alternating strong and weak cords, interspaces as wide as cords or narrower; aperture angular lenticular, apical side pointed; columellar features unknown.
Discussion.—The high variability of the whorl profile in this species, ranging from rounded to bicarinate to almost flat−sided was noted by Stanton (1895). Stewart (1927) suggested that Stanton’s (1895) species may be distinct from Gabb’s (1869) holotype because growth lines and spiral cords were different. However, our material shows all transitions between the morphologies documented by Gabb (1869) and Stanton (1895), and we have no doubt that they belong to one and the same species. In addition, we document that this species was also variable regarding the strength of its growth lines, which develop into strong axial ribs in some specimens.
Stratigraphic and geographic range.—Valanginian to Hauterivian (Lower Cretaceous), in the seep carbonates at Wilbur Springs and Rocky Creek, Great Valley Group, California, USA.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Atresius liratus Gabb, 1869
Kiel, Steffen, Campbell, Kathleen A., Elder, William P. & Little, Crispin T. S. 2008 |
Atresius liratus
Campbell, K. A. 2006: 382 |
Atresius liratus
Wenz, W. 1938: 893 |
Atresius liratus
Stewart, R. B. 1927: 426 |
Atresius liratus
Cossmann, M. 1906: 193 |
Atresius liratus
Stanton, T. W. 1895: 68 |
Atresius liratus
Gabb, W. M. 1869: 169 |