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New Records of Albunea Carabus (L., 1758) (Decapoda, Anomura) in the Mediterranean Sea

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New Records of Albunea Carabus (L., 1758) (Decapoda, Anomura) in the Mediterranean Sea NEW RECORDS OF ALBUNEA CARABUS (L., 1758) (DECAPODA, ANOMURA) IN THE MEDITERRANEAN SEA BY S. GIACOBBE and N. SPANÒ Dipartimento di Biologia Animale ed Ecologia Marina, Università di Messina, Salita Sperone 31, 1-98166 Messina, Italy ABSTRACT Four adult males and one ovigerous female of Albunea carabus were taken during quantitative sampling carried out in the northern area of the Messina Straits. This is the first record of the species for the southern Tyrrhenian Sea. The substratum was identified as the Biocoenosis of Coarse Sand and Fine Gravels under Bottom Currents (SGCF, Pérès & Picard, 1964) and hypotheses on the species' habitat are discussed. Finally, new data on the maximum size of the species are provided. RIASSUNTO Cinque esemplari di Albunea carabus (quattro maschi adulti e una femmina ovigera) sono stati catturati, nell'ottobre 1992, nell'area settentrionale dello Stretto di Messina. Si tratta della prima segnalazione riguardante il Mar Tirreno meridionale. In questa nota vengono riportate ipotesi sull'habitat della specie, identificato nella Biocenosi delle Sabbie Grossolane e Ghiaie Fini sottoposte all'azione delle Correnti di Fondo (SGCF di Pérès & Picard, 1964). Infine vengono forniti nuovi dati sulle dimensioni massime della specie. INTRODUCTION During October 1992, benthic littoral communities were studied in the northern entrance of the Straits of Messina, Sicily. The rare and little known species Albunea carabus (L., 1758) (Decapoda, Anomura, Hippidea) was then found. This record, the first from the southern Tyrrhenian Sea, agrees with what is known of the distribution and ecology of this interesting species. 720 METHODS AND MATERIALS Sampling was carried out on 16 and 21 October, 1992 by means of a Van Veen modified grab having a drawing capacity of 70 dm3 and 0.25 m2 (Basso et al., 1990) during an ecological survey performed by our Department. Two sediment samples of up to 100 cm3 were taken at each station. The samples were washed on board through a 1 mm mesh sieve and then frozen. The macrobenthic fauna was sorted on the same day, in the laboratory ashore. Decapod specimens were fixed in alcohol 70%. Table I gives data about the sampling stations, and fig. 1 shows where they are located. DESCRIPTION The morphological features of Albunea carabus are quite peculiar and widely known. Rubió & Holthuis (1976) provide a critical synthesis of the morphologi- cal characteristics reported by several authors, and the most important diagnostic elements can be deduced: a quadrangular and flattened carapace, with sunken posterior edge; a well-developed abdomen, folded under, but visible in dorsal view; the concave median area of the anterior margin of the carapace with a tiny rostral spine; the lateral part of the anterior margin with sharp, pointed teeth, the lateral margin of the carapace straight and smooth; and flat ocular peduncles. These characteristics, shown in pl. 1, perfectly correspond with those of the spec- imens we are referring to, here. As far as the chromatic pattern is concerned, the peculiar brown colour with purplish highlights was uniformly distributed on the carapace; a purple colour on the legs was not too evident, in comparison with the carapace; violet abdomen; no colour variation was noted between specimens. Therefore, our specimens agree well with the features described in the literature, which shows that the colour of the species is remarkably constant. Carapace length and total length for each specimen are reported in table I. The size of the specimens ranges from 2.0 to 2.5 cm in carapace length and 3.5 to 4.7 cm in total length. Although literature data indicate that the female is larger, we found one male with 2.5 cm carapace length and a total length of 4.7 cm. No secondary sexual dimorphism has been found. DISTRIBUTION Outside of Mediterranean Sea Albunea carabus has been found with certainty in Ghana (Monod, 1956), while records relative to western Africa, the island of .
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