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Crustacea: Tanaidacea: Apseudomorpha) from the Moroccan Atlantic Coast

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Crustacea: Tanaidacea: Apseudomorpha) from the Moroccan Atlantic Coast Travaux du Muséum National d’Histoire Naturelle © 31 août «Grigore Antipa» Vol. LVI (1) pp. 9–18 2013 DOI: 10.2478/travmu-2013-0001 CALOZODION MOYAS, A NEW METAPSEUDID SPECIES (CRUSTACEA: TANAIDACEA: APSEUDOMORPHA) FROM THE MOROCCAN ATLANTIC COAST MOHAMED MENIOUI Abstract. A new apseudomorph tanaidacean species, Calozodion moyas sp. nov., from the Moroccan Atlantic waters is described. The new species is the third species of the genus Calozodion Gardiner, 1973 known in the western African coasts and the tenth in the worldwide fauna. The main features by which the new species differs from all others of the genus Calozodion consist in the presence of a mediodorsale process at the basis of pereopod 2 (absent in C. bacescui Guţu, 1996, C. dollfusi Guţu, 1989, C. heardi Guţu, 2002, C. multispinosum Guţu, 1984 and C. singularis Guţu, 2002) and of five long setae on the first article of mandible palp (comparatively to at most three setae in the species C. dominiki Bochert, 2012, C. simile Guţu, 2006, C. suluk Bamber & Sheader, 2005 and C. wadei Gardiner, 1973). Other differences result from the identification key of the species of the genus Calozodion presented in the final part of this paper. Résumé. Une nouvelle espèce, Tanaidacé Apsedomorphe, Calozodion moyas sp. nov., est décrite des eaux atlantiques marocaines. C’est la troisième espèce du genre Calozodion Gardinier, 1973 connue des côtes de l’Afrique de l’Ouest et la dixième à l’échelle planétaire. Les principaux caractères par lesquels cette espèce diffère de toutes les autres espèces du genre Calozodion consistent en la présence d’une excroissance médiodorsale au niveau du basis du pereopode 2 (absente chez C. bacescui Guţu, 1996, C. dollfusi Guţu, 1989, C. heardi Guţu, 2002, C. multispinosum Guţu, 1984 et C. singularis Guţu, 2002) et de cinq longues soies sur le premier article du palpe mandibulaire (comparativement à, au plus, trois soies chez les espèces C. dominiki Bochert, 2012, C. simile Guţu, 2006, C. suluk Bamber & Sheader, 2005 et C. wadei Gardiner, 1973). D’autres différences sont exprimées dans la clé d’identification des espèces du genre Calozodion présentée dans la partie finale de ce document. Key words: Tanaidacea, Apseudomorpha, Metapseudidae, Morocco, Calozodion moyas sp. nov. INTRODUCTION Tanaidaceans are still unknown crustaceans in Morocco, as well as in many other marine areas. The only papers regarding these crustaceans are Monod (1925 a, b), Tattersal (1925) and Menioui (1988, 1997). In my study area, I identified a new species of the genus Calozodion Gardiner, 1973, associated with two other crustacean species (Chondropodus curvispinus Guţu, 2006 and Plectrocopus spicatus Guţu, 2006) reported previously from the Mauritanian coast (Guţu, 2006). In this paper, I present an identification key and a formal description of the new species Calozodion moyas sp. nov. The used terminology follows Larsen (2003). The new species lives within the lagoon environment of Cintra Bay (southern Morocco), an area particularly interesting by its hydrological characteristics (Upwelling). It is recorded in the subtidal zone at shallow water (about 6 meters) on a soft aphytic bottom, rich in shell debris. The biological material is collected using scuba diving, and each sample corresponds to an area of 1m2 of sediment, kept in a liquid consisting of 10% formalin and 90% seawater. It’s the first time that the genus Calozodion is identfied in the Moroccan coast, as well as two other genera (Chondropodus, Plectrocopus) described in the 10 MOHAMED MENIOUI Mauritanian coasts by Guţu (2006), suggesting a similarity between the study area (Cintra Bay) and the Mauritanian coasts. SYSTEMATICS Family Metapseudidae Lang, 1973 Subfamily Chondropodinae Guţu, 2009 Genus Calozodion Gardiner, 1973 The genus Calozodion was described by Gardiner (1973) from the Caribbean Sea (Coast of Jamaica Island) based on a single female. Guţu, (1984) described for the first time the males of this genus. Subsequently Guţu (1989, 1996, 2002, 2006), Bamber & Sheader (2005) and Bochert (2012) described other species from different marine areas (Malaysia, Angola, Namibia, Brazilia, Mauritania). Calozodion codreanui, described from the Brazilian waters by Guţu, (1996), was transfered to the genus Vestigiramus (Guţu, 2008). Up to now, the genus Calozodion, classified in the subfamily Chondropodinae by Guţu, 2009, contains ten species including the new species Calozodion moyas sp. nov. described in this paper. The others nine species of this genus (Anderson, 2012, 2013) are the followings: C. bacescui Guţu, 1996, C. dollfusi Guţu, 1989, C. domniki Bochert, 2012, C. heardi Guţu, 2002, C. multispinosum Guţu, 1984, C. simile Guţu, 2006, C. singularis Guţu, 2002, C. suluk Bamber & Sheader, 2005 and C. wadei Gardiner, 1973. Calozodion moyas sp. nov. (Figs 1-3) Material examined: 8 specimens (5 females and 3 males), Atlantic Ocean, Coast of Morocco, Cintra Bay, 6 meters depth; 25/10/2011. Holotype, brooding female, stored in the collection of the “Grigore Antipa”, National Museum of Natural History, Bucharest (Romania), No. 250511. Allotype, 1 male stored in the collection of the “Grigore Antipa”, National Museum of Natural History, Bucharest (Romania), No. 250512; Paratypes, 1 male and 1 female (dissected; 5 slides), No. 250513 and 1 undissected female, stored in the collection of the “Grigore Antipa”, National Museum of Natural History, Bucharest (Romania), No. 250514; and 1 male and 2 females stored in the collection of the “Institut Scientifique, Rabat, Morocco”, No. IST10. Description of the adult female Body (Fig. 1 A) is small, elongate and dorsoventrally flattened. The length of holotype is about 3 mm (without antennule and uropods). The body length is 5 times the width. Cephalothorax, its length is 1.1 times its width. The rostrum is slightly horizontal without point. The eyelobes are conspicuous, acute, with eyes. Pereon is 2.7 times longer than the carapace. The first pereonite is the shortest, rounded laterally; the following pereonites bear a slightly curved process in the first half on each lateral side. Pleon has five free pleonites and a pleotelson. Each pleonite is six times longer than wide, with dorsal and lateral plumose setae. Pleonites 1 to 5 have posterolateral extensions, pointed laterally. CALOZODION MOYAS, A NEW METAPSEUDID SPECIES (CRUSTACEA: TANAIDACEA) 11 B D 0.1 mm 0.1 mm A 0.4 mm E 0.1 mm H I 0.1 mm 0.1 mm F 0.1 mm C 0.1 mm G 0.1 mm Fig. 1 - Calozodion moyas sp. nov., female, paratype: A, body (dorsal view); B, antennule; C, antenna; D, mandible, left; E, labium; F, labrum; G, maxillule; H, maxilla; I, maxilliped and its endite. Antennule (Fig. 1 B) is longer than the carapace. The first peduncle article is 3.5 times longer than wide, with two denticulate processes and four plumose setae on the inner margin, and two denticulate processes and several brooms and plumose setae on the outer margin. A medio-dorsal row of small circumplumose setae is observed along the first peduncle article. The second article is 2.75 times shorter than the first one, 1.75 times longer than wide and bears fourteen simple, broom and circumplumose setae at least; among these setae four of them form a row distally. The third article is 1.75 times shorter than the second article, with one circumplumose seta on the inner margin and four setae distally. The fourth peduncle article (the common) is shorter than the third, with five setae at least. The peduncle four is articled with an inner flagellum among two and an outer flagellum among eight. Articles one, two, four and six of outer flagellum bear distally an esthetasc. The inner flagellum is ended by three simple setae and the outer flagellum by four setae. Antenna (Fig. 1 C) is composed of nine articles with five-articled peduncle. The first peduncle article is the widest (1.7 wider than long), with a plumose seta and a spiniform process in the inner margin. The second peduncle article is the longest, 1.4 times longer than the first one, with three strong spiniform processes and two plumose setae on the inner margin, only one plumose seta and one simple seta are present in the outer margin. The squama is small with six setae: four simple setae among which three are distally and one in the outer margin; one or two plumose setae in the inner margin. The third peduncle article is the shortest, about 4.3 times shorter than the second one, with an inner acute prolongation and a long seta distally. 12 MOHAMED MENIOUI The fourth peduncle article is a little shorter than the fifth one and bears two setae. The latter seta is the “hairiest”. The flagellum is four-articled and bears at least three distal setae in each article, except for the fourth article, the latter is ended by five simple setae. Labrum (Fig. 1 F) as illustrated, is devoid of special features. Mandibles (Fig. 1 D) bears three-articled palps. The first article is bigger than the third article, but shorter than the second one, with five plumose setae and a strong spiniform process “distoventrally”. The second article, the longest, is slightly triangular, with two simple setae dorsally and two rows of setae ventrally; the first row is composed of five long plumose setae and the second row is compsed of nine sub-equal small serrate setae. The third article has nine ciliate setae, increasing in size distally. The cutting edge of pars has four teeth; lacinia mobilis of left mandible without special features. Labium (Fig. 1 E) bears small spines, which are present along the lateral outer margin. Terminal lobe is ovate with long hairs on both sides, and one long serrate seta on each terminal lobe. Maxillule (Fig. 1 G). The external endite has at least nine terminal spines; a bi-articled palp; a second article with a large plumose seta distally and two more slender setae subterminally.
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