Gangugia boto, 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 : 230

Gangugia boto n. sp.

Figures 16 , 18

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Type material. Male holotype from FLONA Carajás (06°00’32”S, 49°58’13”W), Pará, Brazil, 19–24.i.2012, R . Andrade et al. coll., deposited in IBSP 7539 .

Diagnosis. Adult males differ from all other species of the genus by the combination of the following characters: legs from the fifth to the eighth segment with ventral projections in the coxae ( Fig. 31B ); presence of a sigmoid curvature at the apex of the solenomere ( Fig. 16D ) and presence of an elongated secondary process in the prefemoral process ( Figs 16D–E ).

Description. Male (Holotype, IBSP 7539). Coloration (long-preserved in 70% ethanol): Head ocher. Antennae ocher yellowish. Body brown, with the lateral border of the paranota and the posterior edge of the metaterga yellowish ocher ( Figs 16A–B ). Legs ocher. Legs from the fifth to the eighth segment with ventral projections in the coxae being the posterior pair of the sixth segment extremely elongated. Gonopod aperture on seventh body ring broad ( Fig. 16C ); the posterior margin excavated presenting a central sub triangular support. Telson lost. Partial length: 48.13 (until segment 16). Total width: 10.76. Collum, length 3.27, width 10.56. Antennomere lengths (1>7): 0.96; 2.13; 1.69; 1.65; 1.52; 1.69; 0.40. Podomeres lengths (1>7): 1.17; 1.27; 3.03; 1.28; 1.92; 2.00; 0.50. Gonopod aperture, length 2.90, width 4.55. Gonopod: length 3.69, width 2.64. Gonocoxae: length 1.70, width 1.17. Gonocoxae globose, about 1/2 the size of the telopodite. Telopodite: length 3.15, width 1.45. Prefemoral region short ( Fig. 16D ). Prefemoral process ( Figs 16D–F ) long and curved, presenting a dorso-basal lobe, starting from an angle of 225°, involving the solenomere in its initial portion and subsequently ascending parallel to the solenomere and partially covering it in ectal view ( Fig. 16F ); in its anterior portion presents an elongated, thin and acuminate secondary process ( Fig. 16D ). Solenomere long and having a lateral expansion ( Figs 16D–E ), but not reaching the apex of the prefemoral process. Cingulum in basal position, covered by the prefemoral process. Apex of the solenomere with descending sigmoid curvature ( Fig. 16E ).

Female. Unknown.

Distribution. Known only from the type locality ( Fig. 18 ).

Etymology. The species epithet is a reference of the Brazilian folkloric character “Boto cor-de-rosa”.According to indigenous legend, the “pink dolphin”, which lives in the Amazonian’s rivers, turns into a beautiful man during the nights of full moon to get women pregnant. In the next day, it turns into a Boto again. Noun in apposition.

Figures

FIGURE 16. Gangugia boto n. sp. (holotype, IBSP 7539), dorsal views of anterior (A), midbody (B) and ventral view of 6th and 7th (C) body rings. Scale bars: 2 mm. Left gonopod. (D), mesal view; (E), ventral view; (F), ectal view. Scale bars: 1 mm. Abbreviations: PfP, prefemoral process; S, solenomere; SPr, secondary process of the prefemoral process.

FIGURE 18. Distribution map of Gangugia Schubart, 1947 species.

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.