Dardanus insignis ( Saussure, 1858 )

Nucci, Paulo Ricardo & Melo, Gustavo Augusto Schmidt De, 2015, Hermit crabs from Brazil: Family Diogenidae (Crustacea: Decapoda: Paguroidea), except Paguristes, Zootaxa 3947 (3), pp. 327-346 : 336-337

Dardanus insignis ( Saussure, 1858)

( Figs 3 B, 6D)

Pagurus insignis Saussure, 1858: 453 , pl. 3, figs 20, 20a.

Pagurus striatus var. petersii A. Milne-Edwards & Bouvier, 1893: 162 , pl. 11, figs 24, 25.

Pagurus arrosor var. petersii .— Moreira, 1903: 64; 1906: 133.

Dardanus insignis .— Verrill, 1908: 446, fig. 60, pl. 26, figs 4b, c, 5b.— Schmitt, 1926: 48, fig. 69A, D, G.— Williams, 1965: 124, fig. 100; 1984: 197, fig. 137.— Hazlett, 1966: 82.— Coelho & Ramos-Porto, 1986: 50.— Hebling & Mansur, 1995: 471, figs 1–11 [larvae].— Rieger, 1998: 420.— Melo, 1999: 62, fig. 18.—McLaughlin et al., 2010: 20.

Dardanus arrosor ssp insignis .— Forest & Saint Laurent, 1968: 91, pl.1, figs 2, 4.— Scelzo, 1971: 146; 1973: 168.— Coelho & Ramos, 1972: 168.— Scelzo & Boschi, 1973: 208.— Boschi, 1979: 138.— Hebling & Rieger, 1986: 73, fig. 7.

Material examined. Brazil: Rio de Janeiro—Proj. SOL, st. 1144, Cabo de São Tomé, 1 spec. (MZUSP-4726); Cabo Frio, 3 spec. (MZUSP-13807); Proj. Ilha Grande, st. 261, 1 spec. (MZUSP-4727); st. 108, 1 spec. (MZUSP-4742); st. 6B, 1 spec. (MZUSP-4740). São Paulo—Proj. Integrado, st. 13, 8 spec. (MZUSP-8718); st. 14, 6 spec. (MZUSP-8719); st. 4948, 1 spec. (MZUSP-8727); st. 4857, 1 spec. (MZUSP-8725); st. 4852, 2 spec. (MZUSP-8723); st. 4953, 1 spec. (MZUSP-8726); st. 4855, 1 spec. (MZUSP-8724); st. 9, 12 spec. (MZUSP- 8716); st. 6, 11 spec. (MZUSP-8714); st. 35, 34 spec. (MZUSP-7527); 20 spec. (MZUSP-7526); st. 34, 15 spec. (MZUSP-7525); st. 32, 18 spec. (MZUSP-7524); Proj. “Sol”, st. 1034, 2 spec. (MZUSP-4633); st. 1303, 1 spec. (MZUSP-4634); st. 1483, 3 spec. (MZUSP-4639); Ubatuba, 2 spec. (MZUSP-9401); Base do I. O., 6 spec. (MZUSP-7489); Ilha de Alcatrazes, 1 spec. (MZUSP-4620); 1 spec. (MZUSP-7487); leste da Ilha Vitória, 3 spec. (MZUSP-13007); Farol da Moela, 1 spec. (MZUSP-7486); Ilha do Bom Abrigo, 1 spec. (MZUSP-13316); Santos, 2 spec. (MZUSP-12989). Paraná—Paranaguá, 1 spec. (MZUSP-13869). Santa Catarina—Arvoredo, 1 spec. (MZUSP-4629). Rio Grande do Sul—Proj. GEDIP, st. 568, 2 spec. (MZUSP-4614); 1 spec. (MZUSP- 4628); st. 592, 2 spec. (MZUSP-4635); st. 383, 1 spec. (MZUSP-4640); st. 1643, 1 spec. (MZUSP-8669); st. 471, 2 spec. (MZUSP-7488); st. 401, 2 spec. (MZUSP-4638). Uruguay: Proj. GEDIP, st. 310, 1 spec. (MZUSP- 4631); st. 280, 1 spec. (MZUSP-4637); st. 1869, 2 spec. (MZUSP-4630).

Diagnosis. Shield longer than broad, with scattered tufts of setae. Chelipeds strong, left larger than right, covered with ciliated tuberculate striae, arranged in parallel way; cutting edges of fingers with strong white teeth with dark tip. Ambulatory legs (first and second) strong, with similar striated pattern of chelipeds.

Distribution. Western Atlantic—from North Carolina to Florida, Gulf of Mexico, Antilles and Brazil (from Rio de Janeiro to Rio Grande do Sul), Uruguay and Argentina.

Remarks. Dardanus insignis can be easily distinguished from other species of the genus (occurring in Brazil) by the presence of granular striations with fringes of bristles, mainly on the chelipeds.

Figures

FIGURE 3. Shield and cephalic region: A, Dardanus fucosus; B, Dardanus insignis; C, Dardanus venosus; D, Isocheles sawayai.