Species of Excorallana (Isopoda, Corallanidae) from northern and northeastern Brazil, with description of a new species, Excorallana lemoscastroi sp. nov. Author Souza-Filho, Elinai dos Santos Silva Jesser F. text Nauplius 2017 e 2017026 2017-10-19 25 1 21 https://doi.org/10.1590/2358-2936e2017026 journal article 10.1590/2358-2936e2017026 2358-2936 14665924 Excorallana lemoscastroi sp. nov. ( Figs. 5–8 ) Etymology. In honor of the late Dr. Alceu Lemos de Castro, for his great contribution on the taxonomic studies of the isopods from the Brazilian coast. Type locality. Brazil , Paraíba ( 7º39’30”S 34°47’30”W ). Material examined. Holotype : ovigerous female ( MOUFPE 870 ), PB #32 II , Paraíba , 7º39’30”S 34°47’30”W , 76 m depth . Paratype : 1 specimen , sex undefined due to damaged pleopods ( MOUFPE 118 ), Pernambuco , Itamaracá Island , Forte Orange , in coastal sandstone reefs, 7°47’30”S 34°49’27”W . Figure 5. Excorallana lemoscastroi sp. nov. , holotype, ovigerous female, 22 mm. (MOUFPE 870), habitus, lateral view and pleotelson detail. Scale = 1 mm. Figure 6. Excorallana lemoscastroi sp. nov. , paratype male, 10 mm, (MOUFPE 118), antennula, antenna and mouthparts.Scale = 1 mm. Figure 7. Excorallana lemoscastroi sp. nov. , paratype male, 10 mm, (MOUFPE 118), pereopods and uropod. Scale = 1 mm. Figure 8. Distribution of Excorallana lemoscastroi sp. nov. for Brazilian waters. Diagnosis. Head without tubercles, with small eyes. Antennular peduncle with article 1 not dilated.Antenna reaching pereonite 4. Frontal lamina 3x longer than wide, narrower in the middle, apex rounded ( Fig. 17 ). Pereon dorsally smooth. Pleonites 2–4 with tubercles on posterior margin. Pleonite 3 with one median tubercle; pleonite 4 with two median tubercles. Pleonite 5 with two groups (5-5) of small carinae on anterior margin; posterior margin with six tubercles, in two groups (3-3) and one median tubercle. Pleotelson triangular with rounded apex and lateral incision, four tubercles on anterior margin arranged in two groups (2-2). Uropods slightly surpassing apex of pleotelson; margins covered with plumose setae. Description (based on female, 22 mm , MOUFPE 870). Head 0.4x wider than long;small eyes.Antennular peduncle 3-articulated, article 1 not dilated; flagellum 10-articulated. Antenna reaching pereonite4; peduncle 5-articulated; flagellum with 31 articles. Frontal lamina 1.6x longer than wide, narrower in the middle, apex rounded. Maxilla 1 forming large recurved spine; inner lobe simple, with slightly bulbous end. Maxilliped composed of seven articles, with third article of palp approximately 2.5x longer than wide. Mandible with elongated incisor process, slightly curved. Pereon dorsally smooth. Pereopod 1 with basis moderately inflated, 1.7x longer than wide; ischium smooth, approximately 2.2x longer than wide; merus almost as long as wide, posterodistal angle with one simple seta; carpus 2.6x wider than long, anterior margin with one small simple seta; propodus with anterior margin bearing two small simple setae, and one simple seta on anterodistal angle; dactylus robust, hook-shaped, about 2.5x longer than wide. Pereopod 2 with basis moderately inflated, 2.1x longer than wide; ischium 1.9x longer than wide, with one small, robust setae on anterodistal angle; merus 1.2x longer than wide, anterior margin with two groups of robust setae (2-2), posterodistal angle with two simple setae, anterodistal angle with one simple seta; carpus anterior margin with two small simple setae; propodus 2.1x longer than wide, anterior margin with one small simple seta, anterodistal angle with one simple seta; dactylus moderately curved, about 2.4x longer than wide. Pereopod 3 with basis smooth, 2.3x longer than wide; ischium smooth, about 2x longer than wide; merus 1.4x longer than wide, anterior margin with two simple setae, posterior margin with two long simple setae; carpus 0.5x wider than long, anterodistal angle with two small simple setae; propodus 2.1x longer than wide, smooth; dactylus 2.8x longer than wide, smooth, moderately curved. Pereopod 4 with basis ovate, 1.7x longer than wide; ischium 1.3x longer than wide, anterior margin with two groups of simple setae (2-2), anterodistal angle with two simple setae and posterodistal angle with two simple (one short and other long) setae; merus almost as long as wide, anterior margin with two simple setae, anterodistal angle with two simple (one short and other long) setae, posterodistal angle with four simple setae; carpus 1.7x longer than wide, anterior and posterior margin with one small simple seta, anterodistal angle with three (one robust and two simple) setae, posterodistal angle with one simple seta; propodus 4.5x longer than wide, one seta close to anterodistal angle; dactylus moderately curved, approximately 2.4x longer than wide. Pereopod 5 with basis moderately ovate, 1.6x longer than wide, smooth; ischium approximately 2.6x longer than wide, anterior margin with two groups of simple setae (1-2), anterodistal angle with three simple setae, posterodistal angle with five (three short and two long) simple setae; carpus with anterior margin bearing two simple setae; propodus 3x longer than wide, anterior margin with one simple seta, anterodistal angle with four simple seta, one long and three short; dactylus moderately curved, about 3.3x longer than wide, narrower than ischium. Pereopod 6 with basis ovate, 2x longer than wide, smooth; ischium about 1.7x longer than wide, anterior margin with two simple setae, anterodistal angle with two simple setae and posterodistal angle with four (two long and two short) simple setae; merus 1.4x longer than wide, one anterior simple seta, anterodistal angle with four (one short and three long) setae, posterodistal angle with eight (two short robust and six simple) setae; carpus 2.1x longer than wide, anterodistal angle with three (two short and one long) setae, posterodistal angle with six long simple setae; propodus 4x longer than wide, anterior margin with two small simple setae, anterodistal angle with one simple seta; dactylus moderately curved, 2.4x longer than wide, narrower than propodus. Pereopod 7 with basis ovate, 2.5x longer than wide, smooth; ischium about 1.5x longer than wide, anterior margin with one simple seta, anterodistal angle with two small simple setae and posterodistal angle with four (three long and one short) simple setae; merus 2.2x longer than wide, three anterior simple setae, anterodistal angle with one seta, posterodistal angle with three (one robust and two simple) setae; carpus 1.4x longer than wide, anterior margin with one robust seta, anterodistal angle with two (one short and one long) setae, posterodistal angle with five long simple setae; propodus 3.3x longer than wide, anterior margin with three groups of simple setae (1-2), antero and posterodistal angles with two simple setae; dactylus moderately curved about 3.3x longer than wide, less wide than propodus. Pleonite 1 not visible. Pleonite 2 with tubercles on posterior region. Pleonite 3 with tubercles on posterior margin and one median tubercle. Pleonite 4 with three short carinae on anterior margin; lateral tubercles on posterior margin and two median tubercles. Pereonite 5 with four short carinae on anterior margin; posterior margin with three tubercles on each side of median line and one median tubercle. Pleotelson triangular with rounded apex and lateral incision, four tubercles on anterior margin of pleotelson divided into two groups (2-2). Uropods slightly surpassing apex of pleotelson, margins covered with plumose setae. Remarks. This species shares some characters with Excorallana antillensis ( Hansen, 1890 ) from the Caribbean Sea, but they differ regarding (characters of E. antillensis in brackets): (i) the head is 0.4x as wide as long (0.7x as wide as long); (ii) the antenna reaches the pereonite 4 (pereonite 3); (iii) the frontal lamina is 1.6x longer than wide, narrowing in the middle and with a rounded apex (triangular with rounded edges); (iv) pleonite 4 three small carinae (without carinae); (v) pereonite 5 with four short carinae on the anterior margin (without carinae); (vi) endopod and exopod of the uropods acute (rounded); and (vii) pleotelson and uropod margins covered with plumose setae (simple setae). Geographic distribution. Brazil : Paraíba and Pernambuco ( Fig. 8 ).