Arthrosolaenomeris saci, Bouzan & Iniesta & Brescovit, 2021

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 : 216

Arthrosolaenomeris saci n. sp.

Figures 6 , 10E–F , 11

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Type material. Male holotype from Bonito (21°07’16”S, 56°28’55”W), Mato Grosso do Sul, Brazil, 14–23.X.2002, Equipe Biota coll., deposited in IBSP 2571 . Paratypes: four males and one female with the same data of the holotype, deposited in IBSP 2577 (female), IBSP 2568 (two males) and IBSP 2581 (two males) .

Additional material. BRAZIL: Mato Grosso do Sul: Bonito (21°07’16”S, 56°28’ 55”W), 1♂, 1♀ and one juvenile, 14.X.1993, A. Eterovic coll. ( IBSP 1148 ); Miranda (20°14’01”S, 56°21’59”W), Fazenda Cayman, 1♂, X.1992, A. Eterovic coll. ( IBSP 7538 ) .

Diagnosis. Adult males differ from all other species of the genus by the combination of the following characters: presence of indentations in the prefemoral process ( Fig. 6D ) and presence of a conspicuous groove in the apex of the prefemoral process ( Fig. 6D ).

Description. Male (Holotype, IBSP 2571). Coloration (long-preserved in 70% ethanol): Head ocher, with brownish spots. Antennae ocher becoming more whitish along each antennomere towards the apex, the seventh antennomere totally brownish. Body reddish brown ( Figs 6A–C ). In the anterior segments the posterior portion of the metazonite is ochre and the edge of the paranota with the same coloration as the body, except for the slightly clearer peritremata. Legs ochre. Telson reddish brown. Total length: 64.22. Total width: 10.09. Collum, length 2.52, width, 9.54. Antennomere lengths (1>7): 0.69; 1.87; 1.92; 1.64; 1.68; 1.40; 0.32. Podomeres lengths (1>7): 1.00; 1.41; 2.69; 1.49; 1.81; 1.85; 0.60. Gonopod aperture, length 1.80, width 3.27. Telson, length 1.31. Gonopod: length 2.97, width 2.19. Gonocoxae: length 1.02, width 1.34. Telopodite: length 2.84, width 0.84. Prefemoral region 1/3 the size of telopodite. Prefemoral process ( Figs 6D–E ) long, presenting a dorso-basal lobe, starting from an angle of 135°, ascending parallel to the solenomere and partially covering it in mesal view, in the middle part of the process it presents a long secondary process with dagger-shape, with a series of indentations above the secondary process ( Fig. 6D ). The terminal part presents a conspicuous concavity, the process ending in an acute apex ( Fig. 6D ). Solenomere long and narrow ( Fig. 6F ). Cingulum positioned centroposteriorly ( Fig. 6F ). Apex of the solenomere acute and abruptly descending ( Figs 6D, F ).

Female (Paratype, IBSP 2577). Body as in male. Total length: 56.58. Total width: 9.15. Epigyne triangular shaped. Vulva ( Fig. 10E–F ): length 1.35, width 0.68. External valve: length 0.91, width 0.32. Internal valve: length 0.90, width 0.34. Operculum: length 0.50, width 0.55.

Distribution. Mato Grosso do Sul, Brazil ( Fig. 11 ).

Etymology. The species epithet refers to the Brazilian folkloric character “Saci”. According to the indigenous legend, Saci is a boy with only one leg, characterized by his antics, who smokes a pipe and carries a red cap. Noun in apposition.

Figures

FIGURE 6. Arthrosolaenomeris saci n. sp. (holotype, IBSP 2571), 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: 1 mm.Abbreviations: C, cingulum; PfP, prefemoral process; S, solenomere; SPr, secondary process of the prefemoral process.

FIGURE 10. Left vulva. Arthrosolaenomeris chapadensis Schubart, 1943 (IBSP 1049): (A), ventral view; (B), lateral view. Arthrosolaenomeris pantanalensis Schubart, 1943 (CZUFMT 847): (C), ventral view; (D), lateral view. Arthrosolaenomeris saci n. sp. (paratype, IBSP 2577): (E), ventral view; (F), lateral view.Arthrosolaenomeris iara n. sp. (paratype, IBSP 7537). (G), ventral view; (H), lateral view. Scale bars: 0,5 mm. Abbreviations: EV, external valve; IV, internal valve; Op, operculum.

FIGURE 11. Distribution map of Arthrosolaenomeris Schubart, 1943 species.