Chlamys campbellicus Odhner, 1924
ODHNER, N. H. 1924. Papers from Dr Th. Mortensen’s Pacific expedition 1914-1916. XIX. New Zealand Mollusca. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening i Kjøbenhavn, 11: 1-90. [p. 61, pl. 2, figs. 36-39]
PARTIM:
1873 Pecten delicatula Hutton, 1873 [pl. 2, fig. 36]
1909 Pecten (Chlamys) dichrous Suter, 1909 [pl. 2, figs. 37-39]
1909 Pecten (Chlamys) dichrous Suter, 1909 [pl. 2, figs. 37-39]
«Chlamys campbellicus n. sp.
(PI ll, figs. 36-39.) Shell of medium size, solid, both valves equally convex; ears very unequal, sharply set off from the valve by means of a sharp furrow, the anterior ears large) posterior less than half the anterior in length. Sculpture: Right valve, about 22-24 high regular ribs, bifurcating towards front and hind margins and becoming tripartite towards under margin by the appearing of a marginal furrow along each side of the ribs; interstices as broad as the ribs and sculptured with fine, close, concentric lamellae with serrated upper edges, or dissolved into isolated spinulre; these lamellae extend on the lateral sides, and, though more or less worn off, on to the upper side of the ribs. Anterior ear with 5 coarse radiating ribs and a smooth area beneath running from sinus to umbo; bounding groove of the ear serrated by a series of small tubercles. Left valve: Ribs or the same number as in the right valve; concentric lamellae produced on the ribs into small imbricating scales. Colour of both valves orange rosy. Dimensions: max. h. 32, br. 29 mm. Locality: Campbell I'sland: 45, 10 dead valves, the small ones having a fresh appearance showing that the species belongs to the actual fauna.
Its nearest ally seems to be Chlamys patagonicus King, which occurs in West Patagonia from 50º S to Tierra del Fuego and on the Eastern coast of Patagonia to 51º 30' S as well as in the Falkland Islands (Hägg 1910). The chief differences between both forms are to be found in the greater number of ribs in the latter species (about 35 on the disc and in the right anterior ear 6), together with a paler reddish-gray colour. The partition of the ribs is similar, but ChI. patagonicus often shows a bifurcating of the median ribs towards the inferior margin, and has, besides, an intermediate riblet in each interstitial furrow; a similar intermediate riblet is totally absent in ChI. campbellicus. — The Fossil Pecten triphooki, ZitteI, which has been found Fossil in Campbell Island (Marshall 1909, p. 701), seems to be closely related, too.» NILS HJALMAR ODHNER, 1924
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N. H. Odhner, 1924, plate 2.
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