Angelodesmus Schubart, 1962

Bouzan, Rodrigo Salvador, Iniesta, Luiz Felipe M. & Brescovit, Antonio Domingos, 2021, Cladistic analysis and taxonomic review of the millipede tribe Arthrosolaenomeridini Hoffman, 1976 (Polydesmida: Chelodesmidae), Zootaxa 4970 (2), pp. 201-256 : 234

Angelodesmus Schubart, 1962

Angelodesmus Schubart, 1962: 258 .

Type species: A. costalimai Schubart, 1962 , by original designation; Hoffman, 1976: 173; Hoffman, 1980: 151; Shelley et al. 2000: 84

Diagnosis. Males of Angelodesmus differ from those of other Arthrosolaenomeridini genera by the combination of the following characters: stipes of the gnathochilarium with lateral folds; gonocoxae acuminate in ectal view ( Fig. 19F ); dorso-basal lobe in the prefemoral process absent ( Fig. 19D ); apex of the solenomere with the terminal zone marked by a stretch mark ( Figs 19D, F , arrows).

Description. General characters: Coloration (specimen long preserved in 70% ethanol) whitish yellow, paranota tip and posterior border of the metaterga slightly whitish. Gnathochilarium: lingual plate covered completely by sparsely setae; mentum only centrally covered by setae, with smooth edges and stipes completely covered by sparsely setae and positioned mainly in the median region, presenting lateral folds. Body rings: cuticle slightly rough; alignment of paranota in posterior view straight; sternite of the fourth segment with a pair of projections, sternites of the fifth and sixth segments with two pairs of intumescences also covered by setae, the posterior pair less conspicuous; leg pair of the third body ring missing. Sternite of sixth body ring with two pairs of ventral projections; seventh body ring without projections and post-gonopodal sternites with two pairs of rounded ventral projections ( Fig. 30D ). Paranota form: round ( Fig. 19B ). Legs: without modifications only a slightly dorsal lobe on prefemur ( Fig. 31D ).

Male characters: Leg pair of the third body ring missing, as well as the genital papilla. Posterior edge of the gonopod aperture without projections, excavated. Gonopods: gonocoxae equivalent to about half the length of the telopodite, cylindrical and acuminated in ectal view, without a spiniform process ( Fig. 19F ). Prefemoral process: elongate and thin, without a dorso-basal process ( Fig. 19D ). Cingulum in a middle position ( Fig. 19F ). Solenomere also long and thin with apex ascending ( Fig. 19D ).

Female characters: Unknown.

Distribution. State of Goiás, Brazil ( Fig. 28 ).

Composition. Now considered as monotypic: Angelodesmus costalimai Schubart, 1962 .

Figures

FIGURE 19. Angelodesmus costalimai Schubart, 1962 (holotype, MZSP), dorsal views of anterior (A), midbody (B) and posterior (C) body rings. Scale bars: 2 mm. Left gonopod. (D), mesal view; (E), ventral view; (F), ectal view. Scale bars: 0,5 mm. Abbreviations: C, cingulum; PfP, prefemoral process; S, solenomere.Arrows refer to the stretch mark.

FIGURE 28. Distribution map of Angelodesmus Schubart, 1962 and Folcloredesmus n. gen. species.

FIGURE 30. Sternites, ventral projections. A) Arthrosolaenomeris pantanalensis Schubart, 1943 (IBSP 530), 6th body ring; B) Dioplosternus salvatrix Hoffman, 2005 (IBSP 1084), 6th body ring; C) Arthrosolaenomeris saci n. sp. (IBSP 1148), 7th body ring; D) Folcloredesmus thomasi n. sp. (CZUFMT 833), 9th body ring; E) A. saci n. sp., 9th body ring; F) Abiliodesmus planaltensis (Schubart, 1960) comb. nov. (IBSP 3570), 9th body ring. Scale bars: A–C, 1 mm.; D, 0,5 mm.; E, 0,3 mm.; F, 0,3 mm.

FIGURE 31. Legs. A) Arthrosolaenomeris pantanalensis Schubart, 1943 (IBSP 530); B) Gangugia boto n. sp. (holotype, IBSP 7539); C–D) Abiliodesmus planaltensis (Schubart, 1960) comb. nov. (IBSP 3570); E–F) Gangugia tapirapensis Schubart, 1947 (MNRJ 12008). Scale bars: A) 2 mm.; B) 1 mm.; C) 1 mm.; D) 1 mm.; E) 500 µm.; F)1 mm. Abbreviations: co, coxae; f, femur; prf, prefemur; pst, postfemur; t, tarsus; tb, tibia; tc; tarsal claw.