Thuridilla gracilis
(Risbec, 1928)
Also known as: Thuridilla bayeri, Thuridilla ratna
Photographed by: Indra Swari
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Opisthobranchia |
| Order: | Sacoglossa |
| Family: | Plakobranchidae |
| Species: | Thuridilla gracilis |
Comment from Nathalie Yonow on photo #24124
Very strange locality for this species - mistake??Comment from Nathalie Yonow on photo #22079
This is the first gracilis I have seen without the orange tips.Comment from Nathalie Yonow on photo #36569
Another specimen with unpigmented rhinophores.Comment from Nathalie Yonow on photo #37675
In-between form.Comment from Nathalie Yonow on photo #38063
Another record with white/cream rhinophores and no orange or black pigmentation.Comment from Nathalie Yonow on photo #21582
Another form with different rhinophores, banded with white, orange and black. At least a dozen records now.Comment from Nathalie Yonow on photo #21583
Banded rhinophores.Comment from Nathalie Yonow on photo #23143
Whit,. orange, black-tipped rhinophores.Comment from Nathalie Yonow on photo #26664
Black margins to the rhinophores.Comment from Nathalie Yonow on photo #28506
Banded rhinophores again but you can just see the white longitudinal lines.Comment from Nathalie Yonow on photo #29103
Banded rhinophores.Comment from Nathalie Yonow on photo #32429
White orange black banded rhinophores.Comment from Nathalie Yonow on photo #33253
This shows perfectly the transition from the usual form to the 'banded rhinophore' form.Comment from Nathalie Yonow on photo #34222
Form showing the transition between normal and banded rhinophore form.Comment from Nathalie Yonow on photo #35807
Banded rhinophore form.Comment from Scott Johnson on photo #30443
This is within the range of variation of T. gracilis. Looking close, you can also detect a hint of orange on the inner parapodial margin.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 (39) Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
- Lembeh (17) Feb, Apr, Jun, Jul, Sep, Oct, Nov, Dec
- Flores (5) Mar, Jul, Aug, Sep
- Raja Ampat (5) Jan, Mar, Jun, Oct, Nov
- Rinca Island (3) Oct, Dec
- Wakatobi (3) Apr
- Bunaken (3) Aug, Dec
- Komodo (2) Jun, Dec
- Manado (2) Sep, Oct
- Sangeang Island (2) Sep
- Pulau Seribu (1) Nov
- Lombok (1) Nov
- Sumbawa (1) Sep
- Taka Bonerate (1) Dec
- Gili Lawa Laut (1) Jan
- North Sulawesi (1) Feb
- Asaudi Island (1) Jan
- Kapoposang (1) Nov
- Ambon (1) Oct
- Nthn. Mariana Islands
- Saipan (13) Mar, Apr, May, Jun, Jul, Sep
- Philippines
- Anilao (7) Feb, Mar, Apr, May, Dec
- Malapascua (3) Mar, Aug, Dec
- Davao (3) Nov, Dec
- Apo Island (2) Jun, Oct
- Subic Bay (2) Apr
- Dumaguete (1) Apr
- Romblon (1) Apr
- Moalboal (1) Feb
- Leyte (1) Apr
- Puerto Galera (1) May
- Coron (1) Aug
- Sogod Bay (1) May
- Dauin (1) Jul
- Malaysia
- Sabah (4) Mar, May, Sep, Dec
- Tioman (2) Sep, Oct
- Mantanani (2) Oct, Nov
- Malaysia (2) Jul, Oct
- Mataking (1) Oct
- Aur - Dayang (1) May
- Tunku Abdul Rahman Park (1) Apr
- Tenggol (1) Sep
- Solomon Islands
- Solomon Islands (3) Oct, Dec
- Palau
- Palau (3) Jan, Feb, Dec
- Timor-Leste
- Timor-Leste (3) Feb
- Taiwan
- North East Coast (2) Sep, Oct
- Long Dong (2) Jun
- Kenting (1) Oct
- Green Island (1) Dec
- Australia
- Queensland (2) Oct, Nov
- Great Barrier Reef (1) Aug
- PNG
- Thailand
- Khao Lak (2) Jan, Nov
- Koh Phangan (1) May
- Koh Tachai (1) Apr
- Koh Lipe (1) Aug
- Thailand (1) Apr
- Guam
- Guam (2) Oct, Nov
- Gun Beach (1) Feb
- Ga'an Point (1) Jun
- Apra Harbor (1) Nov
- Seychelles
- Seychelles (2) May, Sep
- Maldives
- Maldives (2) Jan, Aug
- Fiji
- Fiji (2) Feb, Dec
- Kenya
- Watamu (1) Oct
- Malindi (1) Oct
- Kilifi Creek (1) May
- Micronesia
- Kosrae (1) Jun
- India
- Andaman & Nicobar Islands (1) Jan
- Madagascar
- Nosy Be (1) Jul
- Croatia
- Trogir (1) Feb
