Amblyrhethus bahiensis, Campos & de Mello, 2022

Campos, Lucas Denadai de & de Mello, Francisco de Assis Ganeo, 2022, Three new species of Amblyrhethus (Orthoptera, Grylloidea, Gryllidae, Paroecanthini) from Brazil, Journal of Orthoptera Research 31 (2), pp. 121-141 : 121

Amblyrhethus bahiensis sp. nov.

(Figs 3 , 4 , 7

Material examined. -

Holotype: BRAZIL • ♂; BA[hia], Lençóis / P[ar]q[ue] Nac [ional] da Chapada Diamantina; 12°35'16"S, 41°24'35"W, 600-950 m; 13-19 February 2013; de Mello leg.; CNPq- SISBIOTA | 4453663 | LDC_SIS_001; BOTU.

Type locality. -

Brazil, Bahia, Lençóis municipality.

Etymology. -

Toponymic, referring to the state of Bahia, Brazil.

Diagnosis. -

This species is distinguished from the other species of Amblyrhethus by the following characters: male metanotum without projections, first abdominal tergite with two lamellar humps close to anterior margin; supra-anal plate lateral margins finger-shaped. Male genitalia: PsP posterior margin truncated; rami slightly curved inwards; EctAp anterior margin slightly curved outwards in dorsal and ventral views.

Description. -

Head. Fastigium wider than long, smooth (Fig. 3C ). Three ocelli present, aligned in frontal view (Fig. 3C ); lateral ocelli rounded, median ocellus elliptical, smaller than lateral ones; frons smooth (Fig. 3C ). Antennal scape longer than wide, thinner than fastigium in frontal view. Maxillary palpi articles 3, 4, and 5 almost same-sized; article 5 sub-straight (Fig. 3B ). Thorax. Dorsal disk wider than long, covered by bristles (Fig. 3A ). Dorsal disk cephalic margin slightly concave, caudal margin convex (Fig. 3A ). Lateral lobes ventro-cephalic and ventro-caudal angles rounded (Fig. 3B ). Forewings covering abdomen, hindwings slightly longer than forewings (Fig. 3A, B ). Legs. TI with tympana present on inner and outer faces; three apical spurs, two ventral, one dorso-internal. TII with three apical spurs, two ventral, one dorso-internal. TIII subapical spurs 5/4, with one spine between each spur, except proximal spurs with two spines; seven spines above subapical spurs on inner and outer sides. FIII longer than TIII (Fig. 3B ). TIII inner apical spurs: iad>iam>iav; outer apical spurs: oam>oav>oad. Basitarsus dorsal spines 3/1; inner apical spur slightly longer than outer apical spur.

Male. Forewings slightly shorter than hindwings; anal area slightly bulged dorsally (Fig. 3B ), A1 connected to A2. Stridulatory vein (PCu vein) present, portion close to CuPa strongly sinuous. Harp crossed by four veins connected to CuPa; first and second harp veins shorter than third and fourth; third and fourth harp veins connected in the proximal region. Mirror as wide as long, divided in the middle by a curved vein on its right half. Apical field as long as mirror; lateral field with 12 diagonal veins (Fig. 3D ). Metanotum without projections, first abdominal tergite with two lamellar projections close to anterior margin (Fig. 3E ). Supra-anal plate posterior margin rounded (Fig. 3F ), lateral margins finger-shaped on the middle; subgenital plate as long as wide, posterior margin convex (Fig. 3G ).

Male genitalia: (Fig. 4 ) Pseudepiphallus: pseudepiphallic sclerite trapezoidal in dorsal and ventral views; slightly curved upwards in lateral view; anterior margin somewhat rounded on median region (Fig. 4A ). LLophi curved upwards, posterior margin rounded in dorsal and ventral views; ventral face translucent (Fig. 4A, B ). PsP longer than LLophi, inner margin not divided, posterior margin truncated, not surpassing posterior margin of pseudepiphallic sclerite in dorsal and ventral views (Fig. 4A, B ); posterior half wider than anterior half in ventral view (Fig. 4B ). Rami slightly curved inwards in dorsal and ventral views, two or more times longer than pseudepiphallic sclerite (Fig. 4A-C ). Ectophallic invagination: EctF strongly sclerotized, triangular, on the edge of posterior margin of pseudepiphallic sclerite (Fig. 4A-D ). EctAp longer than pseudepiphallic sclerite, anterior margin slightly curved outwards in dorsal and ventral views (Fig. 4A, B ); arc not complete, curved posteriorly; ventral projections of ectophallic invagination shorter than arc. Endophallus: End short, u-shaped in the middle of pseudepiphallic sclerite (Fig. 4B ).

Female. Unknown.

Coloration. -

Occiput, vertex, and pronotum general coloration reddish brown to medium brown (Fig. 3A, B ). Face reddish-brown (Fig. 3C ); antennal scape reddish-brown to dark brown; antennomeres yellowish with some isolated antennomeres medium brown (Fig. 3B ). Forewings slightly translucent, medium brown. Metanotum whitish brown (Fig. 3E ), abdominal tergites medium brown, darker on last segments. Supra-anal plate medium to dark brown, lateral margins darker (Fig. 3F ). Abdominal sternites yellowish brown; subgenital plate medium brown (Fig. 3G ). FI, FII, TI, and TII medium brown to yellowish brown. FIII yellowish-brown, slightly striped, distal margin darker; TIII yellowish-brown; spurs yellow with apex medium to dark brown; tarsomeres yellowish-brown (Fig. 3B ).

Figures

Figure 3. Amblyrhethus bahiensis sp. nov., male: A, habitus, dorsal; B, habitus, lateral; C, head, frontal; D, right forewing; E, metanotum and first abdominal tergite; F, supra-anal plate; G, subgenital plate. Scale bars: 5 mm (A, B); 1 mm (C-G). Abbreviations: see material and methods.

Figure 4. Amblyrhethus bahiensis sp. nov., male genitalia: A. dorsal; B. ventral; C. lateral; D. posterior. Scale bar: 1 mm. Abbreviations: Abbreviations: see material and methods.

Figure 7. Map of the known distribution of Amblyrhethus species.