Somalipecten leesi (Cox, 1929)
COX, L. R. 1929. Notes on the Post-Miocene Ostreidae and Pectinidae of the Red Sea region, with remarks on the geological significance of their distribution. Proceedings of the Malacological Society of London, 18: 165-209, pls. 11-13. [p. 197, pl. 11, fig. 4; pl. 13, figs. 5a, 5b]
1929 Chlamys (Aequipecten) leesi Cox, 1929
L. R. Cox, 1929, plates 11, 13.
|
«Specific Characters.— Shell of medium size, suborbicular, slightly inequilateral, with the
length and height usually about equal. Left valve fairly convex, the profile of
some specimens showing an obtuse median angularity. Ornamentation consisting of
eight moderately wide and prominent, rather flattened ribs, separated by
flattened interspaces of their own width, or rather wider ; fine radiating
threads are visible in the interspaces. Ears of moderate size, with a very
obscure radial ornamentation. Interior of shell with wide, flattened ribs,
sharply limited near the ventral margin by ridges, and corresponding to the interspaces
of the exterior. Cardinal crura conspicuous, consisting of a pair of strong ridges
diverging from the hinge-margin at a small angle, and a pair of shorter ridges,
variable in strength, sub-parallel to the margins of the ligament-pit.
Auricular crura moderately strong. Eight valve unknown.
Dimensions (holotype).— Length, 61 mm.; height, 58 mm.; inflation, 15 mm. Type Material.— The holotype (L. 37817), and three paratypes (L. 37818, L. 37824-5), all left valves. Remarks.— These four specimens resemble one another very closely in the character of their ribbing, but in only one is there a pronounced angularity in the profile. Like Ch. farsanensis, this species seems to belong to the same group as Ch. lessepsi and Ch. isthmica. Its wider ribs, more orbicular shape, and greater convexity serve to distinguish it from Ch. farsanensis, its more prominent and square-cut ribs, as well as its greater convexity, from Ch. isthmica, and its fewer ribs and greater convexity from Ch. lessepsi. Its cardinal crura differ from those of Ch. isthmica, but are not unlike those of Ch. lessepsi. It does not resemble any living species very closely. Occurrence.— Mugersim Island, Sudan Coast; upper beds of 2,000 feet section (Wyllie-Lees Coll.). Specific Name.— Named after one of its collectors, Dr. G. M. Lees, of the Exploration Staff, of the Anglo-Persian Oil Co., Ltd.» LESLIE REGINALD COX, 1929
|