Catoessa boscii (Bleeker, 1857)

(Fig. 1 d–f)

Livoneca boscii Bleeker, 1857: 21, 29–30, pl. 1 (fig. 9).— Schiöedte & Meinert, 1884: 365–367, pl. 15 (Cym. XXXIII), figs 7, 8.— Nierstrasz, 1931: 143, 145.

Lironeca boscii . — Miers, 1880: 466–467.— Nierstrasz, 1915: 100.— Trilles, 1979: 265–266.— Trilles, 1994: 174.

Catoessa boscii .— Bruce, 1990: 251, 254.— Trilles, Ravichandran & Rameshkumar, 2012: 179–189, fig. 1–4.— Rameshkumar & Ravichandran, 2013a: 119–120, figs 1, 2.— Rameshkumar, Ravichandran & Sivasubramanian, 2013c: 88–94.— Rameshkumar, Ramesh, Ravichandran & Trilles, 2014: 940–944, fig. 1b.— Rameshkumar, Ravichandran & Ramesh, 2014c: 124–128, fig. 6.— Aneesh, Helna & Sudha, 2016a: 1270–1277, fig. 1f.

Joryma brachysoma .— Ravichandran, Rameshkumar & Balasubramanian, 2010a: 97–98, fig. 1.— Ravichandran, Sunitha & Rameshkumar, 2010b: 370–373, fig. 3.

Type and type locality. A single specimen ovig. female, total length 15 mm, held at the RMNH (No. I. 67), from the Batavia Sea (= Java, Indonesia) is believed to be the type specimen. As for the most species collected by Bleeker (1857) the type host and the site of attachment was not precisely identified (“Habite la peau de diverses especes depoissons”, “Living on the skin of different host species”) .

Material examined. 4 ovig. females (15–20 mm), Parangipettai, 28 December 2008, 8 February 2009 and 21 November 2009, from Carangoides malabaricus (Bloch & Schneider, 1801), coll. G. Rameshkumar (MNHN-Is 6303 to Is 6306) , 1 ovig. female (17 mm), Parangipettai coast, 22 November 2016, (ZSI / MBRC D1-530) , 3 non ovig. females (15–20 mm), (CAS / MBRM C- 40– C- 42) from Carangoides malabaricus, coll. S. Ravichandran. All localities from the state of Tamil Nadu, southeast coast of India .

Remarks. Catoessa boscii was most recently redescribed by Trilles et al. (2012). This species can be recognized by elongate body shape (2.5–3 times as long as greatest width) and narrower pleon; the pleon is usually rotationally twisted a little so the shows an angle against the plane of the pereon. Cephalon not deeply immersed in pereonite 1, anterior margin truncate, reflexed ventrally into triangular lobe separating antennula; Posterior margin of pereonite 7 slightly indented.

Catoessa boscii is readily distinguished from all other species of the genus. Catoessa ambassae Bruce, 1990 and C. boscii are essentially distinguished from the two other species of the genus by the presence of a truncate rostrum and carina on basis of the posterior pereopods while Catoessa scabricauda Schiöedte & Meinert, 1884 and Catoessa gruneri Bowman & Tareen, 1983 have an acute rostral point or a rounded rostral point, respectively and all pereopods without carina on the basis. Catoessa boscii is characterized by the presence of uropods extending beyond of a subtriangular pleotelson while C. ambassae has a broadly rounded pleotelson with uropods not reaching posterior margin of pleotelson.

Colour. Live females are pale tan or pale brown with visible chromatophores; all live males pale tan (Trilles et al. 2012).

Size. Non ovig. females 15–21 mm; ovig. females 15–20 mm (Trilles et al. 2012).

Distribution. Catoessa boscii has distributed from Indonesia to India. Previously recorded from Indonesia (Bleeker 1857) and most recently reported from southeast coast of India (Trilles et al. 2012).

Host. Current studies are from host families Carangidae: Rastrelliger kanagurta . Previously reported from a host of the Carangoides malabaricus (Trilles et al. 2012), an Indo–West Pacific species, occurring in the continental shelf, near rocks and coral reefs. A single specimen was reported by Trilles (1979) from Stolephorus indicus in Indonesia.