Amblyrhethus alagoensis, 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 alagoensis sp. nov.

(Figs 5 , 6 , 7

Material examined. -

Holotype: BRAZIL • ♂; AL[agoas] Quebrangulo / Res [erva] Biol [ ógica] Pedra Talhada / Arm [adilha]; Malaise - 1° Bosque; 08-11 September 2002; Refugos; Penteado-Dias & eq[uipe] leg; MZSP . Allotype: BRAZIL • ♀; Satuba, Alagoas, Brasil / Area de Protecao Ambiental do Catole ; 25 July 2012; Dias, P.G.B.S, Costa, C.S., Alcântra, D.M.C.; Nihei S.S. leg.; LDC_014; MZSP .

Type locality. -

Brazil, Alagoas, Quebrângulo and Satuba municipalities.

Etymology. -

Toponymic, referring to the State of Alagoas, Brazil.

Diagnosis. -

This species is distinguished from other species of Amblyrhethus by the following characters: male forewings vein A1 not connected to A2; metanotum with two clusters of bristles on the middle; first abdominal tergite with two rounded projections close to anterior margin. Male genitalia: pseudepiphallic sclerite somewhat enlarged on anterior half, especially at the middle level, rounded in dorsal and ventral views; PsP clavate, EctAp slightly curved inwards in the middle, both in dorsal and ventral views. Copulatory papilla tapered, with two anterior projections.

Description. -

Head: Fastigium wide, with bristles laterally (Fig. 5E ). Three ocelli present, aligned in frontal view (Fig. 5E ); lateral ocelli rounded, median ocellus elliptical, smaller than lateral ones; frons smooth (Fig. 5E ). Antennal scape longer than wide, narrower than fastigium in frontal view. Maxillary palpi article 3 the longest, 4 and 5 almost same-sized; article 5 straight (Fig. 5B, D ). Thorax: Dorsal disk wider than long, covered by fine pubescence (Fig. 5A, C ). Dorsal disk cephalic margin slightly concave, caudal margin convex (Fig. 5A, C ). Lateral lobes ventro-cephalic and ventro-caudal angles rounded (Fig. 5B, D ). Forewings covering abdomen, hindwings slightly longer than forewings (Fig. 5A-D ). Legs: TI with tympana present on inner and outer faces; three apical spurs, two ventral, one dorsal. TII with four apical spurs, two ventral, two dorsal. TIII subapical spurs 5/4, with two spines between each spur, except proximal spurs with three spines; eight spines above subapical spurs on inner and outer sides. FIII longer than TIII (Fig. 5B, D ). 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. 5B ), A1 not connected to A2. Stridulatory vein (PCu vein) present, portion close to CuPa 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. Apical field longer than mirror; lateral field with 13 diagonal veins (Fig. 5F ). Metanotum with two clusters of bristles on the middle, first abdominal tergite with two rounded projections close to anterior margin (Fig. 5G ). Supra-anal plate posterior margin rounded (Fig. 5H ); subgenital plate longer than wide, posterior margin convex (Fig. 5I ).

Male genitalia: (Fig. 6 ) Pseudepiphallus: pseudepiphallic sclerite trapezoidal in dorsal and ventral views, anterior half inflated; slightly curved upwards in lateral view; anterior margin rounded on median region (Fig. 6A ). LLophi curved upwards, posterior margin sub-straight in dorsal and ventral views; ventral face translucent (Fig. 6A, B ). PsP clavate, longer than LLophi, not surpassing posterior margin of pseudepiphallic sclerite in dorsal and ventral views, inner margin with anterior projection finger-shaped (Fig. 6A, B ). Rami straight in dorsal and ventral views, two times longer than pseudepiphallic sclerite (Fig. 6A-C ). Ectophallic invagination: EctF strongly sclerotized, shorter than PsP, trapezoidal on the edge of posterior margin of pseudepiphallic sclerite (Fig. 6A-D ). EctAp longer than pseudepiphallic sclerite, slightly curved inwards in the middle in dorsal and ventral views (Fig. 6A, 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. 6B ).

Female. Larger than male, similar coloration (Fig. 5C, D ). Forewings with longitudinal veins crossed by accessory veins. Subgenital plate wider than long, posterior margin concave (Fig. 5J ). Ovipositor slightly inclined upwards; apex of ovipositor lateral margins serrulate, posterior margin truncate (Fig. 5C, J ). Copulatory papilla bell-shaped, with two posterior thin projections directed ventrally (Fig. 6E-G ).

Coloration. -

Occiput, vertex, and pronotum general coloration reddish brown (Fig. 5A-D ). Face reddish-brown to medium brown (Fig. 5E ); antennal scape medium brown; antennomeres yellowish with some isolated antennomeres medium brown (Fig. 5A-D ). Forewings slightly translucent, medium brown. Metanotum light brown (Fig. 5G ), first three abdominal tergites medium brown, the other tergites dark brown. Supra-anal plate dark brown (Fig. 5H ). Abdominal sternites yellowish brown; subgenital plate medium brown (Fig. 5I ). FI, FII, TI, and TII medium brown to reddish brown. FIII reddish brown, slightly striped, distal margin darker; TIII medium brown; spurs yellow with apex dark brown; tarsomeres yellowish-brown (Fig. 5C ).

Figures

Figure 5. Amblyrhethus alagoensis sp. nov. A. Male habitus, dorsal; B. Male habitus, lateral; C. Female habitus, dorsal; D. Female habitus, lateral; E. Head, frontal; F. Male right forewing; G. Male metanotum and first abdominal tergite; H. Male supra-anal plate; I. Male subgenital plate; J. Female subgenital plate and ovipositor. Scale bars 5 mm (A-D); 1 mm (E-J). Abbreviations: see material and methods.

Figure 6. Amblyrhethus alagoensis sp. nov. Male genitalia: A. Dorsal; B. Ventral; C. Lateral; D. Posterior. Female copulatory papilla: E. Dorsal; F. Ventral; G. Lateral. Scales 1 mm. Abbreviations: see material and methods.

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