Spondylus heidkeae Lamprell & Healy, 2001
LAMPRELL, K. L. & J. M. HEALY. 2001. Spondylidae (Bivalvia) from New Caledonia and adjacent waters. Mémoires du Muséum National d’Histoire Naturelle, 185: 111-163 (In: P. Bouchet & B. A. Marshall Eds., Tropical Deep-Sea Benthos 22). [p. 139, figs 8E, 8F, 10C]
2001 Spondylus heidkeae Lamprell & Healy, 2001
K. L. Lamprell & J. M. Healy, 2001, figures 8, 10.
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«Spondylus microlepos — LAMPRELL, 1987: 72, pI. 27, figs 3a-b.
TYPE MATERIAL. — Holotype MNHN, paratypes AMS C303125, C328193.
TYPE LOCALITY. — New Caledonia, west of Noumea, 22°13' S, 166°22' E, 20 m [LAGON, sta. 272].
MATERIAL EXAMINED. — Australia. Western Australia, Abrolhos Islands, 1 pv (paratype AMS C303125). Queensland, Lizard Island, 12 Iv (paratypes AMS C328193). — North Queensland, Hook Reef, 66 m (KL). — Queensland, off Tiger Cay shoals, Swain Reefs, 1 pv (KL, Fig. 10 C).
Coral Sea. CORAIL 2: sta. DW04, Lansdowne-Fairway Bank, 20°52' S, 161 °37' E, 64 m, 3 Iv. New Caledonia. LAGON: sta. 48, 19°18' S, 158°27' E, 44 m, 1 Iv. — Sta. 131, Ile Ouen-Baie du Prony, 22°28' S, 166°50' E, 38 m, 1 pv. — Sta. 158, 19°46' S, 158°17' E, 28 m, 1 Iv. — Sta. 164, 19°41' S, 158°19' E, 58 m, 1 Iv. — Sta. 272, 22° 13' S, 166°22' E, 20 m, 1 pv (holotype, Figs 8 E-F). — Sta. 428, Grand Récif Sud, 22°41' S, 167°16' E, 56 m, 1 pv. — Sta. 483, Lagon Nord, 19°01' S, 163°32' E, 33 m, 1 Iv. — Sta. 602, Secteur de Yaté, 22°16' S, 167°03' E, 43-48 m, 1 Iv. — Sta. 662, Secteur de Thio, 21 °44' S, 166°32' E, 50 m, 1 Iv. — Sta. 807, Secteur de Poindimié, 20°59' S, 165°29' E, 55 m, 1 Iv. — Sta. 830, 20°49' S, 165°19' E, 105-110 m. — Sta. 986, Secteur de Poum, 20°19' S, 164°00' E, 18 m, 1 Iv. — Sta. 1093, Secteur des Belep, 19°53' S, 163°44' E, 37 m, 1 Iv. — Sta. 1159, 19°13' S, 163°07' E, 50 m, 1 Iv. DISTRIBUTION. — West Pacific: Western Australia to Queensland, New Caledonia. Attached to corals to 56 m.
DESCRIPTION. — Shell to 45.0 mm in height, ovate to elongate-ovate, solid, inequivalve, rv the deeper. Lv flat or moderately convex; sculpture of numerous low principal radial ribs and about 2-5 minor ribs in the interstices; a series of short minor ribs on the anterior and posterior margins ranging from the auricles to between one third and one half of each margin length; some of the minor ribs may be bifurcate terminally; principal ribs ornamented with irregular low nodules and short spines; internal excavation under the hinge plate only, shallow; entire internal margin strongly crenulate. Rv convex, cup-shaped, deeper than Iv; sculpture similar to Iv; internal excavation under hinge plate moderately deep, external ribs obscurely visible internally; entire margin strongly crenulated. Colour red with some white patches, spines and nodules red, sometimes with dark blotches at the base, the minor ribs towards the umbones are white, darker coloured at their crests; internally white, inner margin light brown.
Measurements of holotype: shell 37.0 mm in height, width 34.0 mm, depth of pv 22.0 mm. REMARKS. — Spondylus heidkeae is a very variable Indo-West Pacific species but readily identified by the distinctive series of minor ribs on both valves, which extend down the anterior and posterior margins from the auricles to between one third and one half of each margin length. LAMPRELL (1987) figured S. heidkeae as Spondylus microlepos Lamarck, 1819 but inspection of specimen MHNG 1089/9 labelled "Spondylus microlepos Lk. Type?? (coccineus var.) Chine?" revealed a yellow-orange shell with numerous ribs. In all respects the features of this shell are hard to reconcile with the description given by LAMARCK (1819: 192): "Sp. teste utrinque rubre," longitudinaliter striata et costata; costis 5 s. 6 squamiferis: squamis ligulatis truncatis exiguis". Unfortunately, as for all his species, LAMARCK did not figure S. microlepos and does not mention the dorso-marginal short ribs so characteristic of S. heidkeae nor do the illustrations by SOWERBY (1847b: pI. 88, fig. 46) and REEVE (1856: fig. 65b), which appear to represent the species described by Lamarck. Spondylus heidkeae most closely resembles S. anacanthus and S. candidus in profile but again the distinctive marginal sculpture of S. heidkeae is not evident in either of these species.
ETYMOLOGY. — Named for Mrs Beverly HEIDKE who has assisted with the loan of material for this and other bivalve studies.»
KEVIN LESLIE LAMPRELL & JOHN M. HEALY, 2001
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