Pecten benedictus zeehaenae Fleming, 1957
FLEMING, C. A. 1957. The genus Pecten in New Zealand. New Zealand Geological Survey Paleontological Bulletin, 26: 1-69, pls. 1-15. [p. 35, pl. 3, fig. 3; pl. 5, fig. 5]
«Pecten benedictus zeehaenae Fleming n. subsp. Pl. 3, Fig. 3; Pl. 5, Fig. 5.
1953. Pecten novaezelandiae Reeve, subsp.: Fleming, N.Z. Geol. Surv, Bull. 52: 260.
HOLOTYPE: Right valve, in the New Zealand Geological Survey Collection (GS4151.1). Length, 111; height, 105; inflation, 24 mm. Mount Jowett, Aramoho. Brunswick Pebbly Sand.
MATERIAL: A single right valve and fragments including part of a left valve. More materia is needed to fully diagnose the race.
DIAGNOSIS: A slightly inflated, relatively high Pecten with low roundly subangled ribs; secondary radials on ribs and interspaces towards margin; left valve flat, with low flat-topped ribs. DESCRIPTION: Size moderate, height/length ratio 95 per cent; beak low, inflation 22 per cent of length; ribs 16, low, rounded, with ill-defined sides and broad shallow interspaces. Ribs poorly defined on flanks. Regular secondary threads on 5 anterior and 4 posterior ribs; less regular, fainter secondary grooves on ribs and interspaces of pallial part of disc, a few originating about 30 mm. from beak as median grooves. Intercostal lamellae, chiefly in secondary grooves on flanks. Left valve not notably concave, with flat topped low ribs as in marwicki. LOCALITY: GS 4151, Brunswick Pebbly Sand, from 5 ft. to 10 ft. above base, Mount Jowett, Aramoho (Hawera Series, Terangian Stage). AFFINITIES: Like P. b. tepungai, this form has some characters of the benedictus group and others of the jacoboeus group so that it is difficult to place systematically. Its rounded right-valve ribs contrast strongly with the square-cut ribs of P. n. aotea, which preceded it, and with the subangular ribs of P. n. rakiura which followed it in the Wanganui district. Its left-valve ribs link it with P. benedictus. In shape and inflation, however, P. b. zeehaenae closely resembles novaezelandiae. It is probably a hybrid between an immigrant benedictus stock and P. n. aotea; If so, it represents the last known invasion of the benedictus group into the Cook Strait area.» CHARLES ALEXANDER FLEMING, 1957
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C. A. Fleming, 1957, plates 3, 5.
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