Leander tenuicornis ( Say, 1818 )

Ferreira, Rodrigo Simões, Vieira, Rony Roberto Ramos & D’Incao, Fernando, 2010, The marine and estuarine shrimps of the Palaemoninae (Crustacea: Decapoda: Caridea) from Brazil, Zootaxa 2606, pp. 1-24 : 7

Leander tenuicornis ( Say, 1818)

Palaemon tenuicornis Say, 1818: 249 .

Leander erraticus Desmarest, 1849: 92 .

Leander tenuicornis Kingsley, 1878: 66 ; Holthuis, 1950a: 26; 1952: 155 (in part); Chace, 1972: 19; Williams, 1984: 65; Ramos-Porto, 1985 /86: 13; Ramos-Porto & Coelho, 1990: 97; 1998: 331; Cardoso, 2006: 27 ; Cardoso & Young, 2007: 287.

Material examined. CEARÁ: Fortaleza, Praia do Mucuripe, 1 male, 1 female, 3 ovigerous females, (MNRJ- 1089); RIO GRANDE DO NORTE: Rocas Atoll, (3°51’6,8”S, 33°49’6,04”W), 1 female, (MNRJ-19034); BAHIA: (14°48’30”S, 38°55’00”W), 1 female, 1 indeterminate, (MNRJ-17727); (14°48’30”S, 38°55’00”W), 1 male, 1 ovigerous female, 2 indeterminate, (MNRJ-18639); (15°34’08”S, 38°49’81”W), 1 ovigerous female, (MNRJ-17730); (16°07’30”S, 38°10’52”W), 1 female, (MNRJ-17731); RIO DE JANEIRO: Arraial do Cabo, Praia dos Anjos, 1 ovigerous female, (MNRJ-19284).

Diagnosis. Rostrum reaching about end of scaphocerite, dorsal margin with 11 teeth, first 2 teeth behind orbit, ventral margin with 5 or 6 teeth. Basal segment of antennular peduncle broad with concave or straight anterior margin, stylocerite long, reaching 2/3 of this segment. Mandibular palp with 2 articles, reaching beyond half of incisor process.

Distribution. Western Atlantic Ocean: Canada, USA (Massachusetts, Virginia, North Carolina, South Carolina, Florida, Louisiana and Texas), Bermudas, Mexico, Panama, Bahamas, Cuba, Jamaica, Puerto Rico, Virgin Islands, Colômbia, Venezuela, Brazil (Maranhão, Piauí, Ceará, Rio Grande do Norte, Paraíba, Pernambuco, [Rocas Atoll], Alagoas, Sergipe, Bahia, Espírito Santo, Rio de Janeiro and São Paulo), Malvinas Islands. Oriental Atlantic Ocean: Azores Archipelago – Portugal. Mediterranean: Spain, France, Italy and Libya. Pacific and Indian Oceans: Red Sea, India, Japan, Papua New Guinea, Australia and New Zealand.

Remarks. L. tenuicornis has sexual dimorphism in the shape of the rostrum. The female has a broadened ventral margin rostrum ( Manning, 1961).