Atlantodesmus itapurensis ( Schubart, 1943 )

Bouzan, Rodrigo Salvador, Pena-Barbosa, João Paulo P. & Brescovit, Antonio Domingos, 2017, Taxonomic review of the genus Atlantodesmus Hoffman, 2000 (Polydesmida: Chelodesmidae), Zootaxa 4236 (2), pp. 269-290 : 279-280

Atlantodesmus itapurensis ( Schubart, 1943)

Figures 4 D̄F, 9–11, 19

Leptodesmus itapurensis Schubart, 1943: 148 , fig. 48–50 (Male holotype from Itapura (51°30’32’’W, 20°38’45’’S), Andradina, São Paulo, Brazil, originally deposited in Instituto Oswaldo Cruz, now in the MZSP 926, examined). Leptodesmus buecherli Schubart, 1955: 514 , fig. 1 (Three males and one female syntypes, from District of Santana, São Paulo (46°38′ 0″ W, 23°33′ 0″ S), São Paulo, Brazil, 1940, W. Bücherl leg. deposited in MZSP 924-925, examined). New synonymy.

Atlantodesmus itapurensis: Hoffman, 2000: 106 .

Justification of synonymy: Type specimens of both nominal species were examined. The original descriptions of both species show complete agreement when considering the body shape and color. Gonopods of A. buecherli and A. itapurensis display no difference. The presence of a serrated margin on the apex of the prefemoral process is variable even in the same specimen and slight variations occur in the spoon-shaped blade of the prefemoral process. However, these variations are considered intraspecific.

Additional material examined. BRAZIL. MATO GROSSO DO SUL: Chapadão do Sul , Porto das Pedras, (52°53’33’’W, 19°38’33’’S), 1♂, 07/XI/2008, Sampaio col. ( MNRJ 11969 ) . SÃO PAULO: Assis, Estação Ecológica de Assis , (50°41’88’’W, 22°66’04’’S), 14♂ 10♀, 25–30/XI/2002, Equipe Biota col. ( IBSP 2973 , IBSP 2975 , IBSP 2976 , IBSP 2978 , IBSP 2979 , IBSP 2980 , IBSP 2981 , IBSP 2983 , IBSP 2984 , IBSP 2985 , IBSP 2986 , IBSP 2987 ) . Araçatuba, Anhangaí (50°45’36’’W, 21°20’28’’S), 1♂, XII/1926, R. Spix col. ( MZSP 923 ) . Teodoro Sampaio, Parque Estadual Morro do Diabo (52°29’74’’W, 22°52’89’’S), 2♂ 1♀, 11–14/XI/2012, P.G.B.S Dias et. al. col. ( IBSP 4369 ) . Monte Aprazível (49°71’03’’W, 20°76’83’’S), 2♂ 5♀, 9/I/1950, O. Schubart col. ( MZSP 3288–3290 , MZSP 3289–3293 ) .

Diagnosis. Males of Atlantodesmus itapurensis differ from all other species of the genus by the spoon-shaped tip of the prefemoral process being in close proximity to the solenomere tip ( Fig. 10 D, arrow).

Redescription. Male (Holotype, MZSP 926). Coloration (in alcohol): Head light brown. Antenna yellow. Body light brown. Paranotal tips yellowish. Telson light brown. Total length: 40. Collum 1.72 long, 5.36 wide. Antennomere lengths (1>7): 0.6; 1.7; 1.5; 1.5; 1.5; 1.2; 0.3. Gonopod aperture 3.14 long, 3.87 wide. Telson 1.39. Coxae with a distal row of bristles dorsally. Without coxal apophysis. Prefemoral region ventrally positioned, gradually narrowing. Prefemoral process long, narrow at base, widening to end in a broad apex; apical edge with serrated margin and a spoon-shaped blade ( Fig. 10 D, arrow); apex of prefemoral process in close proximity to solenomere tip ( Fig. 9 A). Dorsal side of the prefemoral region with several folds. Conspicuous cingulum present ( Fig. 10 C). Solenomere long and falciform, with a pointed tip. Lobe present above the bifurcation of the solenomere and the acropodite process, in mesal view ( Fig. 9 A, arrow). Acropodite process blade-shaped and curved, apex shovel-shaped. Acropodite process distinctly longer than solenomere, enveloping the solenomere ( Figs 10 A–B).

Female (IBSP 2973). Coloration (in alcohol) and body as in male. Total length 44. Collum 1.57 long, 4.81 wide. Telson 1.56. Cyphopods ( Figs 11 C–D) with many fine bristles on the valves, valves apically with concave groove, intermediate membrane not protruding ( Fig. 11 D).

Distribution. States of Mato Grosso do Sul and São Paulo, Brazil, in areas containing the Brazilian Atlantic forest and Cerrado biomes ( Por et al. 2005).

Figures

FIGURE 4. Dorsal views of anterior (A, D, G), midbody (B, E, H) and posterior (C, F, I) segments of Atlantodesmus eimeri (A – C), A. itapurensis (D – F) and A. pickeli (G – I).

FIGURE 9. Atlantodesmus itapurensis (Holotype, MZSP 926), right gonopod. A, mesal view; B, ectal view. Scale bar = 1 mm. Abbreviations: A, acropodite process; Cg, cingulum; PfP, prefemoral process; S, solenomere. Arrow refers to lobe present above the base of the solenomere.

FIGURE 10 Atlantodesmus itapurensis. A, left gonopod in mesal view; B, left gonopod in ectal view; C, detail of the welldefined cingulum; D, detail of the distal part of the prefemoral process; E, Aperture of gonopod; F, detail of folds in the posterior margin of the aperture of gonopod. Abbreviations: A, acropodite process; Cg, cingulum; PfP, prefemoral process; S, solenomere. Arrow refers to spoon-shaped blade in the prefemoral process.

FIGURE 11. Atlantodesmus itapurensis. A, projection of the third sternum in anal view; B, lateral projection on the seventh segment; C, cyphopods in dorsal view; D, cyphopods in lateroventral view. Arrows refers to the projections of the third sternum.