Macrogryllus canorus Gorochov, 2022

Gorochov, A. V., 2022, New and little known taxa of the genera Gymnogryllus and Macrogryllus (Orthoptera: Gryllidae: Gryllinae) from Indo-Malayan and Papuan Regions, Proceedings of the Zoological Institute of the Russian Academy of Sciences 326 (1), pp. 3-13 : 10-12

Macrogryllus canorus Gorochov sp. nov.

( Figs 24 , 39–43 )

Etymology. This species name is the Latin word “canorus ” (loud) in connection with its loud calling song.

Type material. Holotype – male, MALAYSIA: Malay Peninsula, Pahang State, Fraser’s Hills near border with Selangor State, 17–18 km SW of Raub Town, 1000–1300 m, primary forest in evening, during calling song near own burrow, 15–23 April 2010, A. Gorochov, M. Berezin, E. Tkatsheva . Paratypes: 5 males, same data as for holotype .

Description. Male (holotype). Size and coloration of body very similar to those of M. ephippium : head and pronotum shining, black with yellowish ocelli and lower half of clypeus, with greyish eyes, with greyish brown antenna having barely lighter (brown) three proximal segments (including scape), with light brown rest of mouthparts having dark brown upper half of clypeus and upper parts of mandibles as well as brown areas on labrum and on proximal two thirds of maxillary palpi, and with almost dark brown ventral halves of lateral pronotal lobes and brown transverse band along posterior pronotal edge; legs dark brown to brown with light greyish brown coxae and trochanters, with light brown tarsi (except for rather dark hind basitarsus) and apices of tibiae, and with not large yellowish spot on only dorsal surface of apical part of hind femur; tegmina also shining, blackish with almost semitransparent membranes of stridulatory appartatus, with light brown short thickened vein near plectrum, with greyish both intercalary triangle and stripe along medial and posterior edges of apical area of dorsal field, and with dark brown lateral field having ventroproximal area (i.e. area along basal part of costal edge) greyish. External structure also very similar to that of this species (head very large and rather high, rostrum between antennal cavities almost twice as wide as scape, all ocelli located almost along one transverse line, pronotum distinctly saddle-backed in profile and sligtly narrowing to its posterior third as well as somewhat widening backwards in this third; Fig. 42 ), but outer tympanum almost 2.5 times as long as wide and approximately as long as width of fore tibia in tympanal region, this tympanum also almost 1.5 times as long and wide as inner tympanum, hind tibia with three pairs of not large dorsal spines having bases almost fused with this tibia, tegmina hardly protruding beyond abdominal apex and with seven oblique veins as well as with mirror barely transverse ( Fig. 43 ), and hind wings insignificantly not reaching tegminal apices. Genitalia ( Figs 39–41 ) clearly distinguished from those of this species by ectoparamere having proximal (anterior) portion distinctly shorter and not separated from its distal (posterior) portion by strong narrowing, latter (posterior) portion with distinctly less convex lateral edge (in ventral view), mesal lobe somewhat smaller (shorter) but with similar membranous finger-like process at apex, posterodorsal sclerite thinner (narrower) and with longer apical lobule (see Figs 22, 23 and 24 ).

Variation. Dark parts of body often dark brown or brown, but in latter case, epicranium with large dark brown anterior area, tegmina with dark brown spots on posterior part of basal area in dorsal field and before (near) plectrum as well as with larger light brown mark after (but also near) plectrum reaching place of contact of 1A with 2A in basal area (membranes in rest part of dorsal field and in lateral field also slightly lighter than in holotype), and legs with almost dark brown area in middle part of hind femur and in basal part of hind tibia; light dorsal spot on apical part of hind femur sometimes slightly larger than in holotype and with a pair of narrow tongues almost reaching ventral surface of this femur, but often this spot light brown (less distinct) and smaller than in holotype. Hind tibiae sometimes with four dorsal inner spines. Genitalia in some males with slightly narrower anterior portion of ectoparamere and with barely more angular or almost truncate apical ectoparameral part.

Female unknown.

Length (mm). Body 35–40; body with wings 38–42; pronotum 8.0–8.5; tegmen 29–31; hind femur 21.5–23.0; hind tibia 11.5–12.5; hind basitarsus 5.5–5.8.

Comparison. The new species differs from M. ephippium mainly in the characters of the male genitalia, listed above, as well as in a smaller light spot located only on the dorsal surface of the hind femur apical part. From three other species included in this genus by previous authors (see OSF), the new species is distinguished by the same characters as M. ephippium : the body is distinctly larger, and/or the coloration is different (two of these other species are known only in Africa and may be members of another genus, and data about third one are given below).

Remark. The burrows with calling males of this species were also similar to those of M. ephippium .

Figures

Figs 18–33. Structures of male genitalia (schematically), left ectoparamere from below (18–27) and epiphallic apex from behind (28–33): 18 – Gymnogryllus egorovi sp. nov.; 19 – G. vietnamensis mada subsp. nov.; 20 – Phonarellus minor (Chop.); 21 – Tarbinskiellus portentosus (Drury); 22 – Macrogryllus ephippium ephippium (Sauss.); 23 – M. e. vespertinus Gor.; 24 – M. canorus sp. nov.; 25 – M. bicolor Chop.; 26 – Megalogryllus (Megalogryllus) excellens Gor.; 27 – M. (Gigantogryllus) neotropicus (Gor.); 28 – G. v. mada subsp. nov.; 29 – G. v. longidens Gor.; 30 – G. v. vietnamensis Gor.; 31 – G. sylvestris Gor.; 32 – G. obscurus Gor.; 33 – G. equinus Gor. [20, 21, 26, 27 – after Gorochov (2019); 29–33 – after Gorochov (2011).]

Figs 34–43. Macrogryllus Sauss., male: 34–38 – M. bicolor Chop.; 39–43 – M. canorus sp. nov. Body from above (34); head in front (35); genitalia from side (36, 39), from above (37, 40) and from below (38, 41); head and pronotum from above (42); distal half of dorsal tegminal field (43).