| Home> Cenozoic> Miocene>
 

List species

Lychnocanoma magnacornuta (Sakai, 1980)

Description - Add description

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 µ; cephalis, 20 to 25 µ; thorax, 85 to 95 µ; and foot, 130 to 180 µ. Width of horn is 15 to 25 µ; cephalis 35 to 45 µ; thorax 110 to 130 µ; and foot 20 to 25 µ. Diameter of pores in thorax is 8 to 15 µ.
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


Description

 

Images

 

Synonyms

 

References

 

Distribution

 

Discussion / Comments

 

Web links