Thordisa sp.

Mehrotra, Rahul, A. Caballer Gutierrez, Manuel, M. Scott, Chad, Arnold, Spencer, Monchanin, Coline, Viyakarn, Voranop & Chavanich, Suchana, 2021, An updated inventory of sea slugs from Koh Tao, Thailand, with notes on their ecology and a dramatic biodiversity increase for Thai waters, ZooKeys 1042, pp. 73-188 : 73

* Thordisa sp. Figure 13C

Material examined.

One specimen 12 mm, TT.

Ecology.

Found in soft sediment habitats at 16 m depth.

Distribution.

Unknown.

Remarks.

Dorsal colour deep red, with white rhinophore clubs and gills. The most distinctive feature of the species appears to be a pair of distinct, elongated, white, conical papillae surrounded by 5-7 white extensions radiating out at the base of each papilla, on either side of the mid-dorsal ridge. Besides these are a few smaller but still elongated white papillae randomly distributed. Additionally, the base of the white gills and translucent red rhinophore stalks is surrounded by a thin white line which similarly can be found around the margin of the mantle. The most similar known species might be T. sanguinea Baba, 1955 which may be distinguished based on the ground colour, dorsal ornamentation (covered in papillae), and the colour of the rhinophores and gills.

Figures

Figure 13. A Rostanga sp. 18 mm B Sebadoris fragilis 70 mm C Thordisa sp. 12 mm D Doriopsis cf. granulosa 7 mm E Doriopsis pecten 6 mm F Doriopsis viridis 4 mm G Doris cf. immonda 5 mm H, I Dorididae sp. 15 mm (H photograph by Jeremy Coz) and 8 mm (I) J Goniodoridella sp. 1 6 mm K Goniodoridella sp. 2 3 mm (photograph by Khumron Waipaka) L Trapania cf. gibbera 5 mm.