Chlamys suprasilis crepusculi Fleming, 1948
FLEMING, C. A. 1948. New species and genera of marine Mollusca from the Southland fiords. Transactions of the Royal Society of New Zealand, 77: 72-92, fig. 1, pls. 4-8. [p. 77, pl. 7, figs. 1-3]
«Chlamys suprasilis crepusculi n. subsp. (Pl. 7, figs. 1, 2, 3.)
Shell of moderate size, fairly solid, very compressed, equivalve, with unequal ears. Sculpture on right valve; strong radial ribs, slightly scabrous in front and behind, arranged in pairs. In the holottype there is an anterior rib, then ten pairs of ribs, grouped so that the width of the interspace between each of a pair of ribs is considerably less than (usually under half) the width of the interspace between adjacent pairs of ribs. The fourth to seventh pairs of ribs (from front) lose their paired form by the flattening-out marginally of the interspace. Fairly strong (but not lamellate) concentric growth lines are crossed by divaricate "Camptonectes" striation. In left valve eleven widely spaced narrow primary ribs; the broad interspaces over three times the width of the rib, with strong Camptonectes sculpture, and with a secondary rib, locally and poorly developed in one paratype, but subequal to the primaries in the other, matching the obsolescent interspaces between the paired ribs of the right valve. Anterior ears about thrice the length of posterior which bear three beaded radiating ribs; anterior ears with five wide-spaced beaded ribs in left valve, six broad, close-set, scaly ribs in right, separated from anterior margin by broad fasciole, sculptured by coarse sinuous growth folds. Ctenolium with four free teeth. Ligamental pit broad, triangular, fairly deep, hinge margin striated. Colour of holotype is reddish, of paratypes, purplish brown, and dull yellow with white interrupted concentric markings.
Height, 14; width, 12; thickness (right valve), 1 8 mm. (holotype). Locality: New Golden Hind Bottom Station 45, Facile Harbour, Dusky Sound, in 12 fathoms; muddy shell sand (three valves). This species is a deep water local race of C. suprasilis Fin. having the fasciole of that sublittoral species and lacking the concentric intercostal lamellae of radiata (Hutton) and its allies, even though it has the compressed form of radiata.» CHARLES ALEXANDER FLEMING, 1948
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C. A. Fleming, 1948, plate 7.
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