Codakia paytenorum ( Iredale, 1937 )

Glover, Emily A. & Taylor, John D., 2007, Diversity of chemosymbiotic bivalves on coral reefs: Lucinidae (Mollusca, Bivalvia) of New Caledonia and Lifou, Zoosystema 29 (1), pp. 109-181 : 132

Codakia paytenorum ( Iredale, 1937)

( Figs 14G, H ; 15A )

Lentillaria paytenorum Iredale, 1937: 240 , 241, pl. 16, figs 2-3.

Codakia (Codakia) paytenorum – Lamprell & Whitehead 1992: pl. 19, fig. 120.

TYPE MATERIAL. — Figured specimen not isolated from shells of L. paytenorum collected by Iredale on Lord Howe Island ( AMS).

TYPE LOCALITY. — Lord Howe Island, Australia.

MATERIAL EXAMINED. — Koumac. 3 stn, 0-12 m, 2 v, 1 live.

Touho. 2 stn, 0 m, 7 v, 1 live.

Lifou. 9 stn, 0-55 m, 16 v.

Chesterfield Islands. CHALCAL/CORAIL 2, recorded from 24 stn at depths from 28- 69 m.

Other New Caledonia. LAGON, stn 161, Île Ouen, Baie du Prony, 22°34’S, 166°38’E, 2 m, 2 v. — Stn 241, 22°21’S, 167°00’E, 35 m, 1 v. — Stn 294, Grand Récif Sud, 22°44’S, 166°42’E, 21 m, 1 sh. — Stn 545, 22°52’S, 166°50’E, 37 m, 1 v. — Stn 772, secteur du Poindimie, 21°08’S, 165°41’E, 30 m, 2 v. — Stn 1139, secteur des Belep, 19°24’S, 163°47’E, 39 m, 1 v. — Stn 1140, 19°24’S, 163°44’E, 44 m, 1 v. — Stn 1156, 19°10’S, 163°13’E, 55 m, 1 v. — Stn 1157, 19°10’S, 163°10’E, 48 m, 2 v. — Stn 1196, 19°33’S, 163°21’E, 30 m, 1 v.

DISTRIBUTION. — Red Sea, Indian Ocean, West Pacific.

DESCRIPTION

Shell solid, medium to large (H to 53 mm, L to 55 mm), subcircular. Sculpture low radial ribs of variable width, narrower at anterior and posterior margins and often sparse in central part of shell. Ribs crossed by numerous fine, sometimes anastomosing, commarginal lamellae. Anterior and posterior dorsal areas raised into finely nodular sculpture. Lunule short, heart-shaped, deeply impressed, strongly asymmetrical. RV with two cardinal teeth and a large anterior lateral very close to cardinals and a vestigial posterior lateral. LV with one cardinal, an anterior lateral close to cardinal, and a low posterior lateral. Anterior adductor scar short, tapering, detached for 1/2 of length. Shell margin smooth, glossy. Colour white, umbonal areas tinged dark pink, interior shell margin deep pink to white, shell within pallial line bright yellow.

REMARKS

Iredale (1937) introduced the name Lentillaria paytenorum for shells with intensely rose-red coloured shell margins from Lord Howe Island and Queensland, distinguishing the new species from the yellow-coloured C. interrupta (Lamarck, 1818) . We have examined a large number of specimens of both the yellow and pink margined “species” from the IWP and have been unable to find any consistent morphological differences to separate them. Preliminary molecular analysis (unpublished data) has revealed differences between the yellow forms similar to C. interrupta and the pink margined C. paytenorum including a sample from the type locality. For this reason we use the name C. paytenorum for the pink-margined New Caledonia samples.

Figures

FIG. 14 — A-C, Codakia punctata (Linnaeus, 1758), Touho, stn 1242, New Caledonia (MNHN); A, exterior of left valve; B, C, interior of right and left valves; D-F, C. tigerina (Linnaeus,1758), Touho,stn 1242, New Caledonia (MNHN);D, exterior of right valve; E, F, interior of left and right valves; G, H, C. paytenorum (Iredale, 1937), Touho, stn 1245, New Caledonia (MNHN), exterior and interior of right valve. Scale bars: 10 mm.

FIG. 15 — Outline drawings of interiors of right valves of Codakia Scopoli,1777 and Ctena MÖrch,1861 species:A, Codakia paytenorum (Iredale, 1937); B, Codakia punctata (Linnaeus, 1758); C, Codakia tigerina (Linnaeus, 1758); D, Ctena bella (Conrad, 1837). Not to scale.