Comment from Nudi Pixel editor: Not sure if this one is Ceratosoma trilobatum as the line on the edge of the mantle is broken (which I think makes this species belongs to Ceratosoma gracillimum). Ceratosoma gracillimum. This certainly appears to be the case on the animal’s right side, but it cannot be checked on the left side because the rhinophore is blocking the view. However, given the locality, this might be just another colour form of Ceratosoma trilobatum.
- Lembeh (91) Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec
- Bali (9) Jan, Apr, May, Sep
- Komodo (6) May, Aug, Sep, Dec
- Rinca Island (4) Oct, Nov, Dec
- Manado (4) Jan, Apr, Jul
- North Sulawesi (3) Apr
- Raja Ampat (3) Jan, Mar, Dec
- Ambon (3) Jan, Oct
- Alor (2) Jun, Nov
- Bunaken (2) Feb, Dec
- Bima (1) Sep
- Lombok (1) Aug
- Vietnam (2) Feb, May
- Myanmar (1) Apr
- Tofo (1) Jun
- Hurghada (1) Jan
- Kilifi Creek (1) Nov
Pictures of Ceratosoma gracillimum
Ceratosoma gracillimum can be distinguished externally by the complete absence of the mantle edge between the head and the well-developed lateral lobes on each side.
Ceratosoma trilobatum has the mantle edge, edged in purple, between the head and the lateral lobes. Both species have a similar range of colour variations, as does Ceratosoma tenue, but they differ from each other externally by the lack of a mantle edge in Ceratosoma gracillimum and the extra pair of small lateral lobes in Ceratosoma tenue.