Halgerda sp. 4

(Figure 17 B)

Material examined. Six specimens. MB28-004459, ZWH, 0 5 Feb. 2012, 17m, 25mm, collected by L. Robisson; MB28-004527, ZGWS, 23 Mar. 2012, 22m, 25mm; MHN-YT567, ZA51, 23 Aug. 2012, 12m, 24mm; MB28- 0 0 4698, ZGWS, 26 Jul. 213, 18m, 29mm; MB28-004716, ZT, 11 Aug. 2013, 33m, 20mm; MB28-0 0 4802, ZY, 0 4 Feb. 2014, 33m, 24mm.

Habitats. Subtropical rocky reefs.

Occuurences: Zavora.

Geographic distribution. Western Indian Ocean. Mozambique .

Remarks. This species resemble H. toliara but differs externally by the lack of secondary lines between the ridges and small tubercles surround the mantle.