Thuridilla gracilis
(Risbec, 1928)
Also known as: Thuridilla bayeri

Photographed by: Michael Henke
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Opisthobranchia |
| Order: | Sacoglossa |
| Family: | Plakobranchidae |
| Species: | Thuridilla gracilis |
Comment from Richard Willan on photo #2629
In contrast, Thuridilla splendens has a yellow head, grows to a much larger size, and does not “nod” its head as it is crawling along.Locality:
- Indonesia
- Bali (22) Feb, Mar, Apr, May, Jul, Aug, Sep, Oct, Nov, Dec
- Lembeh (10) Feb, Apr, Jul, Oct, Nov
- Wakatobi (3) Apr
- Raja Ampat (3) Jan, Oct, Nov
- Bunaken (1) Dec
- Ambon (1) Oct
- Flores (1) Mar
- Gili Lawa Laut (1) Jan
- North Sulawesi (1) Feb
- Manado (1) Oct
- Asaudi Island (1) Jan
- Nthn. Mariana Islands
- Saipan (8) Apr, Jun, Jul, Sep
- Solomon Islands
- Solomon Islands (3) Oct
- Philippines
- Davao (2) Nov, Dec
- Subic Bay (2)
- Sogod Bay (1) May
- Anilao (1) Feb
- Malapascua (1) Dec
- Thailand
- Khao Lak (2) Jan, Nov
- Palau
- Palau (2) Jan, Feb
- Guam
- Guam (2) Oct, Nov
- Apra Harbor (1) Nov
- Ga'an Point (1) Jun
- Malaysia
- Maldives
- Maldives (1) Jan
- Taiwan
- Long Dong (1) Jun
- North East Coast (1) Sep
- Green Island (1) Dec
- Kenting (1) Oct
- Fiji
- Fiji (1)
- PNG
- Kenya
- Australia
- Queensland (1) Nov
- Seychelles
- Seychelles (1)