* Berthella martensi (Pilsbry, 1896) Figure 8K

Material examined.

One specimen 60 mm, LB.

Ecology.

Exclusively recorded from soft sediment habitats outside coral reefs. Depth 11-21 m.

Distribution.

Widespread throughout the Indo-Pacific including the Red Sea (Yonow 2015), Mozambique ( Tibiriçá et al. 2017), India (Sreeraj et al. 2012), Maldives (Yonow 1994), Tanzania, Mauritius, Indonesia, the Philippines, Taiwan, Australia, Papua New Guinea, Solomon Islands, Hawaii, and the Pacific coast of Mexico (Gosliner et al. 2008).

Remarks.

Individuals from Koh Tao have a dark, almost black mantle with numerous inconspicuous black spots. Berthella martensi was recorded by Nabhitabhata (2009) based on a local record (in Thai), but the location(s) of this record is unknown. Therefore, while B. martensi is known from the Gulf of Thailand, its presence along the Andaman coast of Thailand is unconfirmed.