Atlantodesmus pickeli ( Schubart, 1946 )

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 : 282-283

Atlantodesmus pickeli ( Schubart, 1946)

Figures 4 ḠI, 12, 19

Leptodesmus pickeli Schubart, 1946: 166 , fig. 1 (Male holotype, originally recorded as Bairro da Casa Verde, São Paulo, however the correct location is Jardim São Bento, São Paulo (46°38′ 0″ W, 23°33′ 0″ S) , São Paulo, Brazil; 1939, Dom B. J. Pickel leg., deposited in IBSP 29 , examined).

Atlantodesmus pickeli: Hoffman, 2000: 106 .

Diagnosis. Males of Atlantodesmus pickeli differ from all other species of the genus by the presence of a small triangular lobe above the base of the solenomere ( Fig. 12 A, arrow) and prefemoral process densely serrated in its distal part ( Figs 12 A–B).

Additional material examined. None.

Redescription. Male (Holotype, IBSP 29). Coloration (in alcohol): Head reddish brown. Body dark brown. Paranotal tips yellow. Telson brown. Total length: 60. Collum absent. Antennomere lengths (1>7): 0.97; 2.32; 2.20; 1.95; 2.18; 1.60; 0.31. Gonopod aperture 3.14 long, 3.87 wide. Telson missing. Gonopods: coxae with two bristles on the distal dorsal side. Coxal apophysis not acute. Prefemoral region ventrally positioned. Prefemoral process long, narrow in the base and dilated at its apex, with densely serrated margins ( Fig. 12 A). Reduced cingulum present ( Fig. 12 B). Solenomere tip acute. Triangular lobe above the base of the solenomere, visible in mesal view ( Fig. 12 A, arrow). Acropodite process forming a large hood, with serrated distal mesal margin ( Figs 12 A–B).

Female (IBSP 4433). Coloration (in alcohol) and body as in male. Total length 60. Collum 2.59 long, 8.08 wide. Telson 1.80.

Distribution. Known only from the city of São Paulo, São Paulo, Brazil, in areas containing the Brazilian biome Atlantic forest ( 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 12. Atlantodesmus pickeli (Holotype, IBSP 29), right gonopod. A, mesal view; B, ectal view. Scale bar = 1 mm. A, acropodite process; Cg, cingulum; PfP, prefemoral process; S, solenomere. Arrow refers to lobe present above the base of the solenomere.