Page 4 - Collective Article_2017

Fig. 2: a. Habitat of Baseodiscus delineatus in the Estany des Peix, Formentera, Spain. b. Ventral view of Baseodiscus delineatus
from Formentera Island, Spain.

and 2 mm in width, although most of the posterior portion
was lost (Fig. 2b). The N. geniculatus specimen meas-
ured 110 mm in length and was 6.5 mm wide (Fig. 3).
A small caudal cirrus was present at the end of the body.
Although nemerteans are commonly found in marine ben-
thic environments, publications on this topic are scarce
in the literature, perhaps due to difficulties in collection,
preservation and identification to species level (Fernán-
dez-Álvarez et al., 2015). However, recent efforts to bet-
ter understand the Iberian nemertean fauna have led to a
compilation of 86 species (Herrera-Bachiller et al., 2015;
Fig. 3: Dorsal view of Notospermus geniculatus from For- Herrera-Bachiller, 2016).
mentera Island, Spain. The two records represent the first ones for these spe-
cies in Formentera. Baseodiscus delineatus is also present
Here, we provide a report on one specimen of B. de- in the Tyrrhenian and Adriatic Seas (Kajihara, 2007). De-
lineatus found at Estany des Peix (Formentera Island, spite its size and conspicuity, N. geniculatus is not a wide-
Balearic Sea, 38.721556° N, 1.415100° E) on the after- ly reported species in taxonomic lists. For instance, for
noon of October 17 , 2016, under a rock along the shore- the Mediterranean Iberian waters, only four records were
th
line of the southernmost part of the lagoon (Fig. 2a), and known between 1985 and 2014 (Herrera-Bachiller et al.,
a specimen of N. geniculatus (Fig. 3) found under a rock 2015). However, more comprehensive work showed more
located on a muddy bottom covered with Caulerpa pro- records across this area (Herrera-Bachiller, 2016), sug-
lifera (Forsskål) J.V. Lamouroux at 1 m depth in the same gesting that it is a common species in these waters. This
lagoon (38.729594°N, 1.410836°E). After capture, the underlines the importance of surveys aiming to increase
specimens were placed in a 7.5% MgCl solution, pho- our knowledge on nemertean distribution and biology and
2
tographed alive and then fixed in absolute ethanol. The their interactions with the surrounding fauna (Fernández-
anaesthetized B. delineatus measured 108 mm in length Álvarez & Machordom, 2013).

2. MALTA
2.1 Second record of Lagocephalus sceleratus from Maltese waters

A. Deidun & M. Çelik

With the exception of Lagocephalus lagocephalus, Lessepsian fish species: Golani et al., 2017). The silver-
Lagocephalus representatives in the Mediterranean are cheeked toadfish Lagocephalus sceleratus (Gmelin,
considered to be Lessepsian due to their Indo-Pacific ori- 1789), has spread to most regions of the Mediterranean,
gin, constituting part of the almost 100 Lessepsian fish reaching as far west as the Spanish coasts (Karachle et al.,
species documented from the Mediterranean to date (109 2016). The species, known as one of the ‘worst’ invad-

182 Medit. Mar. Sci., 18/1, 2017, 179-201