Gangugia Schubart, 1947

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 : 223-224

Gangugia Schubart, 1947

Gangugia Schubart, 1947: 7 .

Type species: G. tapirapensis Schubart, 1947 , by original designation; Schubart, 1958: 205; Jeekel, 1971: 264; Hoffman, 1976: 177; Hoffman, 1980: 151.

Diagnosis. Males of Gangugia differ from those of other Arthrosolaenomeridini genera by the combination of the following characters: gonocoxae globose ( Fig. 32B ); prefemoral process 225° descending in its initial portion ( Fig. 12D ) (except G. cuca n. sp.); prefemoral process narrow and sharply curved, in ventral view ( Fig. 12E ).

Description. General characters: Body length between 39.07 mm ( G. boitata n. sp.) and 69.42 mm ( G. mula n. sp.). Coloration (specimens long preserved in 70% ethanol) variable between species, ranging from ocher to brown, in general the paranota tip and posterior border of the metaterga slightly whitish ( G. cuca n. sp. show the coloration of the prozonite reddish brown). Gnathochilarium: lingual plate covered by several setae; mentum only centrally covered by setae, with smooth edges and stipes sparsely covered. Body rings: cuticle slightly rough; alignment of paranota in posterior view curved ventrally (straight in G. mula n. sp.). Sternite of the fourth segment with a pair of projections, sternite of the fifth segment with two pairs of projections covered with setae and sixth segment with two pairs of intumescences also covered by setae, the posterior pair being less conspicuous; absence of a pair on the seventh sternite (present in G. boto n. sp.) and post-gonopodal sternites with two pairs of small rounded ventral projections ( Fig. 30D ) (acuminate in G. boitata n. sp.; G. cuca n. sp.). Paranota form: round to slightly rectangular ( Figs 12B , 14B ). Legs: podomeres without thick ventral setae, dorsal lobe of prefemur conspicuous, ventral projection on the coxae ( Fig. 31B ) present only in G. boto n. sp. and G. mula n. sp., presence of granules in the tibia and tarsus ( Fig. 31F ) (absent in G. cuca n. sp.) and a ventroapical projection in the prefemur of the postgonopod legs ( Fig. 31E ).

Male characters: Leg pair of the third body ring with the coxae presenting the rectangular genital papilla. Posterior edge of the gonopod aperture excavated and smooth. Gonopods: gonocoxae equivalent to about half the length of the telopodite, globose, without a spiniform process. Prefemoral process ( Figs 12D–F ): elongate and thin, completely covering the solenomere in ectal view (except in G. simplex and G. cuca n. sp.) presence of a dorsobasal process (rounded in Gangugia tapirapensis , G. boto n. sp., G. mula n. sp. and sub-triangular in Gangugia simplex , G. boitata n. sp., G. cuca n. sp.) and a basal secondary process is present in G. boto n. sp., G. mula n. sp.). Cingulum in basal position (middle position in G. simplex and G. cuca n. sp.). Solenomere long and thin with a hook-shaped apex ( Figs 13D–F ).

Female characters: Vulvae: oval-shaped. In lateral view: rounded in G. mula n. sp. and rectangular in G. tapirapensis .

Distribution. States of Pará, Tocantins, Goiás and Mato Grosso, Brazil ( Fig. 18 ).

Composition. Gangugia tapirapensis Schubart, 1947 ; Gangugia simplex Schubart, 1958 ; G. boitata n. sp.; G. cuca n. sp.; G. boto n. sp.; G. mula n. sp.

Figures

FIGURE 12. Gangugia tapirapensis Schubart, 1947 (lectotype, MZSP 1076), 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.

FIGURE 13. Gangugia simplex Schubart, 1958 (holotype, MZSP 1077), 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.

FIGURE 14. Gangugia boitata n. sp. (holotype, IBSP 1061), 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.

FIGURE 18. Distribution map of Gangugia Schubart, 1947 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.

FIGURE 32. Gonocoxae.A) Arthrosolaenomeris pantanalensis Schubart, 1943 (IBSP 530); B) Gangugia tapirapensis Schubart, 1947 (MNRJ 12008); C) Folcloredesmus thomasi n. sp. (CZUFMT 833); D) A. pantanalensis Schubart, 1943 (IBSP 530); E) F. thomasi n. sp. (CZUFMT 833); F) Abiliodesmus mapinguari n. sp. (CZUFMT 836). Scale bars: A–B, D–F) 1 mm.; C) 0,2 mm. Abbreviations: Cx, gonocoxae; RE, rounded extension; SP, spiniform process.