Spondylus sparsispinosus Dall, Bartsch & Rehder, 1938
DALL, W. H., P. BARTSCH & H. A. REHDER. 1938. A manual of the Recent and fossil marine pelecypod mollusks of the Hawaiian Islands. Bernice P. Bishop Museum Bulletin, 153: i-iv, 1-233, pls. 1-58 [p. 98, pl. 26, figs. 1-5]
1938 Spondylus sparsispinosus Dall, Bartsch & Rehder, 1938
W. P. Dall, P. Bartsch & H. A. Rehder, 1938, plate 26.
|
«Shell of rnedium size, the upper valve moderately convex, somewhat oblique, ranging in color from gray to pale brown, interior pearly gray. Tip of the prodissoconch of the upper valve small, convex, smooth. The following stage flattened, with major radiating ribs present, and also slender, moderately distantly spaced concentric threads, which render the radiating riblets slightly nodulose. In addition to this, microscopic threads cross the spaces between the radiating riblets, both on the later parts of the prodissoconch and the adult shell. On the median part these nicroscopic threads are placed parallel to the riblets, while on the sides they slant obliquely outwardly. Here, too, microscopic concentric threads cross both the riblets and the spaces that separate them. They are a little stronger than the fine radiating sculpture. Twelve radiating ribs are present on the prodissoconch. As the shell progresses in growth, these radiating riblets become stronger and other radiating riblets are intercalated between them until no less than 62 are countable at the margin in the type. These ribs vary in strength, depending upon the point of intercalation, but they are not differentiated into definite strength groups as in Spondylus serratissimus. The radiating ribs are less strong on the sides than on the center of the shell. The heavy ribs bear strong spines which have a partially concentric arrangement, but not completely so, and which are feebly denticulated. The left wing of the upper valve has three threads, while the right wing has mere indications of radiating riblets. Both wings have a few feeble spines, or at least indications of them. (A fragment of the lower valve, U.S.N.M. Cat. No. 335633, shows the later prodissoconch stage to be closely concentrically lamellose, and the rest of the shell, where attached to the substratum, is equally provided with concentric lamella. The remainder of this valve bears very regularly developed and distributed radiating ribs, which are ornamented by short, stout, very regular and regularly disposed, compressed spines, which are hollow at their free end.) The interior of the upper valve is marked by radiating rays which terminate in fluting and feeble scallops at the margin. Ligamental areas of the upper valve narrow, crossed on the end by transverse threads, which are a little wider than the spaces that separate them. The median portion is obliquely striated and has a narrow, oblique, resilial slit, which also extends over the hinge. The hinge has two small low teeth bordering the resilial pit and two large oblique hooked teeth separated from these by a deep pit. The fragment of the lower valve shows a very broad ligamental area.
The type, an upper valve, U.S.N.M. Cat. No. 190436, was dredged by the U.S. Bureau of Fisheries Steamer Albatross at Station 4100, in Pailolo Channel in 130-150 fathoms on coral, sand, shell and foraminifera bottom; bottom temperature 61° F. It measures: height, 45.5 mm.; length., 43.8 mm.; diameter, 15.3 mm.
U.S.N.M. Cat. No. 484160, another upper valve, was also dredged bt the Albatross at the same station. U.S.N.M. Cat. No. 335630, an upper valve dredged by the Albatross at Station 3885 in Pailolo Channel in 136-148 fathoms on sand and pebble bottom; bottom temperature 64.8° F. U.S.N.M. Cat. No. 405333, likewise dredged by the Albatross at Station 4053, northeast of Hawaii in 29-26 fathoms on fine gray sand bottom; surface temperature 75° F. This is the lower valve described. U.S.N.M. Cat. No. 335056, an upper valve dredged by the Albatross at Station 4132 near Kauai in 257-312 fathoms on fine gray sand and mud bottom; bottom temperature 46.8° F. This species is easily distinguished from the other Hawaiian Spondylus with spinose wings, Spondylus serratissimus, by its larger size and scant spinose sculpture which is not developed into definite categories of size. The spines, too, here are but feebly denticulated.» WILLIAM HEALEY DALL, PAUL BARTSCH & HARALD ALFRED REHDER, 1938
|
«Distribution
South China Sea, Queensland, Loyalty Ridge, northern Lord Howe Rise, northern Three Kings Rise, Kermadec Ridge and off White Island, north-eastern North Island, 155-841 m (shells only) (Fig. 70). Remarks
The holotypes of S. sparsispinosus and S. erectospinus are essentially similar, and we agree with Beu and Maxwell (1990) that they may be conspecific. Compared with other spiny Spondylus species occurring of Raoul Island, S. sparsispinosus differs in having far fewer, more widely spaced radial ribs, all of which are set with long, upright spines. Shell colour in the present specimens is orange with two or three yellow radial bands. This is a new record for the NZEEZ: Beu and Maxwell (1990: 90) recorded Spondylus sparsispinosus from “deep water off northern New Zealand”, but omitted locality data placing it unequivocally within the Zone.» DIJKSTRA, H. H. & B. A. MARSHALL. 2008. The recent Pectinoidea of the New Zealand region (Mollusca: Bivalvia: Propeamusiidae,Pectinidae and Spondylidae). Molluscan Research, 28 (1): 1-88, figs. 1-70. [p. 79]
|
Spondylus sparsispinosus
Dall, Bartsch & Rehder, 1938; H. H. Dijkstra & B. A. Marshall, 2008, The recent Pectinoidea of the New Zealand region, figures 68E, 68G. |