Epicodakia nodulosa Glover & Taylor 2007, n. sp.
Creators: name: Glover, Emily A.
name: Taylor, John D.
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Bivalvia
Lucinida
Lucinidae
Epicodakia
Epicodakia nodulosa

description: Epicodakia nodulosa n. sp.
(Figs 18C; 19)
Codakia reevei – Hedley 1909: 426. “ Lucina ” reevei – Lamprell & Whitehead 1992: pl. 20, fig. 124.
TYPE MATERIAL. — Holotype: 1 sh, L 16.6 mm, H 15.2 mm, T 4.0 mm (MNHN).
Paratypes: Loyalty Islands, Lifou, Baie du Santal, stn 1421, 20°52.4’S, 167°08.5’E, 1 sh, L 12.5, H 11.1 mm, T 2.7 mm (BMNH 20050572). — Atoll de Surprise, stn 449, 18°22’S, 163°09’E, 21 m 2 sh, L 14.2 mm, H 12.8 mm,T 3.2 mm; L 11.5 mm, H 9.6 mm,T 2.5 mm (MNHN).
TYPE LOCALITY. — New Caledonia, Koumac, Chenal de l’Infernet, stn 1304, 20°38.6’S, 164°13.2’E, 12-15 m.
ETYMOLOGY. — Nodulosa refers to the nodulose sculpture.
MATERIAL EXAMINED. — Koumac. 3 stn, 0-15 m, 6 v. Lifou. 11 stn, 4-30 m, 14 v.
Chesterfield Islands. CHALCAL 1, stn DC 17, 19°12’S, 158°56’E, 44 m, 1 sh. — Stn DC 24, 19°11’S, 158°11’E, 38 m, 2 v. CORAIL 2, stn DW 31, 19°25’S, 158°45’E, 57 m, 1 v. — Stn DW 40, 19°30’S, 158°35’E, 58 m, 1 v. — Stn DW 42, 19°22’S, 158°29’E, 45 m, 5 v. — Stn DW 44, 19°22’S, 158°23’E, 40 m, 1 v. — Stn DW 60, 19°15’S, 158°57’E, 45 m, 3 v. — Stn DW 72, 19°15’S, 158°21’E, 32 m, 2 v. — Stn DW 73, 19°12’S, 158°23’E, 41 m, 2 v. — Stn DW 76, 19°12’S, 158°33’E, 53 m, 1 v. — Stn DW 87, 19°06’S, 158°60’E, 31 m, 1 v. — Stn DW 94, 19°06’S, 158°50’E, 36 m, 3 v. — Stn DW 96, 19°06’S, 158°42’E, 41 m, 1 v. — Stn DW 101, 19°09’S, 158°26’E, 37 m, 5 v. — Stn DW 110, 19°09’S, 158°56’E, 40 m, 1 v. — Stn DW 122, 19°28’S, 158°17’E, 32 m, 2 v. — Stn DW 126, 19°28’S, 158°27’E, 46 m, 1 sh. — Stn DW133, 19°31’S, 158°25’E, 45 m, 1 v. — Stn DW 155, 19°49’S, 158°25’E, 42 m, 1 v. — Stn DW 156, 19°49’S, 158°21’E, 42 m, 2 v. — Stn DW 160, 19°46’S, 158°23’E, 35 m, 1 v. — Stn DW 163, 19°42’S, 158°16’E, 23 m, 1 v.
Other New Caledonia. LAGON, stn 60, secteur de Nouméa, 22°12’S, 166°11’E, 1 m, 2 v. — Stn 449, Atoll de Surprise, 18°22’S, 163°09’E, 21 m, 1 v. — Stn 1063, secteur des Belep, 20°03’S, 163°47’E, 31 m, 3 v. — Stn 1088, 19°46’S, 163°58’E, 23 m, 1 v. — Stn 1096, 19°51.4’S, 163°41’E, 27 m, 3 v. — Stn 1104, 19°42’S, 163°59’E, 22 m, 3 v. — Stn 1105, 19°40’S, 163°57’E, 25 m, 5 v. — Stn 1118, 19°35’S, 163°52’E, 30 m, 2 v. — Stn 1154, 19°09’S, 163°19’E, 40 m, 1 v. — Stn 1158, 19°10’S, 163°07’E, 48 m, 1 v. — Stn DW 1396, 18°21’S, 16305’E, 39 m, 1 v.
Loyalty Islands. MUSORSTOM 6, stn DW 433, 20°20’S, 169°09’E, 24 m, 1 v. — Stn DW 435, 20°21’S, 166°08’E, 32 m, 6 v. — Stn DW 436, 20°20’S, 166°07’E, 33 m, 1 v.
Australia. Big Sandy Cay, Swain Reefs, Queensland, 21°48’S, 151°52’E, 10 m (AMS C.066765).
DISTRIBUTION. — Australia (Great Barrier Reef), Irian Jaya, Solomon Islands, New Caledonia.
DESCRIPTION
Shell medium size, H to 15.2 mm, L to 16.6 mm, ovate, longer than high, H/L 0.90, not inflated, T/L 0.22, yellow to white. Anteriorly extended, low umbones lie posterior of centre. Sculpture of around 20 strong, rounded, radial ribs separated by wide interspaces. Ribs crossed by regular commarginal lamellae producing thick scales or nodules on summits (Fig. 19E). Lamellae thinner and less prominent in interspaces between ribs. Periostracum surface micro-vesicular (Fig. 19H). Lunule long, shallow, lanceolate, slightly asymmetrical. Ligament short, external, set in shallow groove. RV with two cardinal teeth, the posterior larger and slightly bifid; single anterior and posterior lateral teeth. LV with two cardinals and two anterior and posterior lateral teeth. Anterior adductor muscle scar medium long, detached from pallial line for about 2/3 of length. Posterior adductor scar small, ovate. Pallial line entire. Shell interior radially undulose with impressions of ribbing; shell outside pallial line glossy with smooth margin.
REMARKS
Although this species has been occasionally referred to as “ Lucina ” reevei Deshayes (e.g., Hedley 1909; Lamprell & Whitehead 1992), the original description of Lucina reevei Deshayes, 1863 (pl. 3, figs 8, 9), from Réunion (holotype MNHN) is of a Ctena species with strong, bifurcating radial ribs and an inset, triangular ligament. Epicodakia nodulosa n. sp. is most similar to E. sweeti but has fewer radial ribs (20 vs. 40) that are crossed by more widely spaced, commarginal lamellae that produce thick, nodulose scales on the ribs.
description: Published as part of Glover, Emily A. & Taylor, John D., 2007, Diversity of chemosymbiotic bivalves on coral reefs: Lucinidae (Mollusca, Bivalvia) of New Caledonia and Lifou, pp. 109-181 in Zoosystema 29 (1) on pages 138-140, DOI: 10.5281/zenodo.5392295