Common Name

"Biraghi’s Cone"

Status

Regarded as a subspecies. Described as Thoraconus biraghii congruens.

Type Locality

Off Northern Somalia, gulf of Aden

Distribution

Djibouti area to Cape Guardafui

Maximum Reported Size

11 mm

Description

C. b. congruens is similar in colour pattern to C. b. biraghii. Spiral colour bands more solid and olive-brown. Prominent dashed brown spiral lines extending from base to subshoulder area, articulated with bright white dashes. Larval shell bicoloured: Initial part white to grey, with brown sutural areas; remaining part grading to solid dark brown. Dark brown radial streaks extending from shoulder ramp to adapical spiral colour band.

Habitat & Habits

Shallow water on rocks.

References

• Conchiglia 25 (268): p. 33 & figs 1 – 1c, 3, 6 & pl. 1 fig. 3.