November 13, 2002
From: Luis Sanchez Tocino
A, Ventral view of anterior end showing oral tentacles. B, 8 mm long, Punta del Vapor, Almuñecar, Granada, Spain. 6m deep, 20 October 1996. C, 18 mm long, Punta del Vapor, Almuñecar, Granada, Spain. 4m deep. 13 January, 2000. D, dorso-lateral view of gills. E, Rhinophore. F, dorsal view of gills. G, anterior end showing mantle tubercles. H, posterior end of mantle. I, SEM of mantle tubercles. Scale bar = 500µm.
To compare with Aldisa smaragdina here is some information on the number of gills and rhinophore lamellae in 3 specimens of different size.
8mm long - 9 gills - 8 rhino lamellae
10mm long - 9 gills - 9 rhino lamellae
18mm long - 8 gills - 9 rhino lamellae
Tocino, L.S., 2002 (Nov 13) Aldisa banyulensis from Spain (1). [Message in] Sea Slug Forum. Australian Museum, Sydney. Available from http://www.seaslugforum.net/find/8360
Thanks for illustrating some of the external differences between these two species. Like species of Rostanga it is unfortunate that the differences are not usually clear in photographs of the whole animals.