Aldisa smaragdina Ortea, Pérez and Llera, 1982

Salvador, Xavier, Fernández-Vilert, Robert & Moles, Juan, 2022, Sea slug night fever: 39 new records of elusive heterobranchs in the western Mediterranean (Mollusca: Gastropoda), Journal of Natural History 56 (5 - 8), pp. 265-310 : 272-273

Aldisa smaragdina Ortea, Pérez and Llera, 1982

( Figure 2 (g))

Material examined

Cala d’Aiguafreda , Begur ( Spain), 41°57 ʹ 49”N, 3°13 ʹ 41”E, 24 April 2015, 3 m depth, 1 spc ., L = 7 mm.

External morphology

Body rounded, flat; light red, with two dark circles on dorsum; yellow-brown line present at laterals of body next to the first circle. Gills light red, white at tips of branchial leaves.

Ecology

A single specimen was found at a shallow depth under a rock, on top of the sponge Phorbas topsenti Vacelet and Pérez, 2008 .

Distribution

Atlantic Spanish coast: Canary Islands ( Pruvot-Fol 1953, as Aldisa binotata ; Ortea et al. 1982); Mediterranean Spanish coast: Catalonia (this study).

Remarks

In the original description the body was described as red with two large dark circles and a white line just after the first dark circle ( Ortea et al. 1982). The specimen studied here has lighter red colouration and lacks the second dark circle. The gills are also light red and white on the top, while the conspecific A. banyulensis ( Pruvot-Fol, 1951) has dark red gills, lacking the white top. Moreover, our specimen has a yellow line in the anterior part of the body, anterior to the first dot, while in A. banyulensis the yellow line is found between the first and second dots, displayed slightly towards the posterior part.

Family GONIODORIDIDAE H. Adams and A. Adams, 1854

Genus Okenia Menke, 1830

Figures

Figure 2. Photographs of live Cephalaspidea species: (a) The alien Haloa japonica. (b) Haminoea orteai. (c) Egg mass of Haminoea orteai. (d) Philine catena. The Nudibranchia species: (e) Aegires palensis. (f) White morphotype of Aegires sublaevis. (g) Aldisa smaragdina on top of the sponge Phorbas topsenti. (h) Okenia longiductis on the bryozoan Amathia verticillata.