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Lychnocanoma magnacornuta (Sakai, 1980)

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Lychnocanoma nipponica magnacornuta
Description: Shell of this subspecies is similar to that of Lychnocanoma nipponica nipponica except that its apical horn is markedly large 40 to 70 per cent of the cephalis in width and 2.5 to 4.0 times the cephalis in length.
Dimensions: Measurements are based on 20 specimens from Samples 436-33-4, 25 to 27 cm; 436-33-CC, 6 to 8 cm; 436-34-2, 45 to 47 cm; and 436-35-1, 50 to 52 cm. Length of horn is 60 to 100 ; cephalis, 20 to 25 ; thorax, 85 to 95 ; and foot, 130 to 180 . Width of horn is 15 to 25 ; cephalis 35 to 45 ; thorax 110 to 130 ; and foot 20 to 25 . Diameter of pores in thorax is 8 to 15 .
Remarks: Although the forms reported by Ling (1973) from the subarctic region of the North Pacific, (DSDP Site 173) have a rather small thorax, they are considered a morphological variation of this subspecies.
Holotype: Plate 9, Figures 3a, 3b (IGPS coll. cat. no. 73818) from Sample 436-34-2, 45-47 cm.
Sakai 1980


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