Gorochov, Gorochov, 2023

Gorochov, A. V., 2023, Taxonomy of Podoscirtinae (Orthoptera: Gryllidae). Part 16: the genera Fryerius and Stenotrella from Madagascar, Russian Entomological Journal 32 (2), pp. 129-137 : 130

Subgenus Dentitrella Gorochov , subgen.n.

Type species Fryerius (Dentitrella) dilucidus sp.n.

DIAGNOSIS. Body rather thin and elongate, poorly pubescent or more or less shining. Head with only a pair of rather large and convex lateral ocelli around base of rostral dorsum ( Figs 1, 7, 12 ). Male metanotum with well developed or partly reduced gland; in first case, this gland typical of Fryerius , i.e. with rather large but not deep median concavity having short and rather wide as well as more or less lamellar median process at middle ( Figs 2–3 ); in second case, this gland represented by small transverse fold at middle of metanotum and small rounded median tubercle near it ( Figs 8, 13 ). Wings long, strongly protruding beyond apices of hind femora; tegmina with narrow dorsal field having rather long mirror, chords and apical area ( Figs 16–18 ). Legs with rather large, oval and open inner and outer tympana (inner one slightly immersed; Fig. 1 ), as well as with hind tibia having distinctly spine-like denticles which similar to its articulated spines but clearly shorter ( Figs 6, 11, 15 ). Male genitalia somewhat asymmetrical, with left and right ectoparameres in both ectoparameral pairs slightly or strongly different in length and/or shape ( Figs 19–24, 26–29, 31–32, 34–37, 39–40 ); spermatophore with elongate ampulla and short but rather thick anterior tube, as well as with lamellar plate-like anchor (attachment plate) having distinct and angular posterodorsal projection ( Figs 25, 30, 38 ).

INCLUDED SPECIES. Type species; F. (D.) expolitus sp.n.; F. (D.) proximus sp.n.

COMPARISON. The new subgenus differs from the nominotypical one in the absence of a median ocellus, the both tympana open, and the male genitalia somewhat asymmetrical.

ETYMOLOGY. This generic name originates from the Latin word “denticulus” (denticle, tooth) and the generic name Malgasotrella (due to distinctly spine-like denticles between the articulated spines of the hind tibia).

Figures

Figs 1–15. Fryerius, males: 1–6 — F. dilucidus sp.n.; 7–11 — F. expolitus sp.n.; 12–15 — F. proximus sp.n.; 1, 7, 12 — head with pronotum and parts of fore legs, anterior / dorsolateral view; 2–3, 8, 13 — metanotal gland (2–3) or its rudiment (8, 13), dorsal view; 4, 9 — anal plate with genital plate (4) or only with its base (9), posterodorsal view; 5, 10, 14 — genital plate, ventral view; 6 — hind leg without most part of femur, lateral view; 11, 15 — hind leg (15 — with distal part of middle leg), lateral view. Рис. 1–15. Fryerius, самцы: 1–6 — F. dilucidus sp.n.; 7–11 — F. expolitus sp.n.; 12–15 — F. proximus sp.n.; 1, 7, 12 — голова с переднеспинкой и частЯми передних ног, передний / верхнебоковой вид; 2–3, 8, 13 — метанотальнаЯ желеЗа и ее рудимент (8, 13), вид сверху; 4, 9 — анальнаЯ пластинка с генитальной пластинкой (4) или только с ее основанием (9), верхнеЗадний вид; 5, 10, 14 — генитальнаЯ пластинка, сниЗу; 6 — ЗаднЯЯ нога беЗ больШей части бедра, сбоку; 11, 15 — ЗаднЯЯ нога (15 — с дистальной частью средней ноги), сбоку.

Figs 16–18. Fryerius, right tegmen of male: 16 — F. dilucidus sp.n.; 17 — F. expolitus sp.n.; 18 — F. proximus sp.n. Рис. 16–18. Fryerius, правое надкрылье самца: 16 — F. dilucidus sp.n.; 17 — F. expolitus sp.n.; 18 — F. proximus sp.n.

Figs 19–41. Fryerius, male: 19–25 — F. dilucidus sp.n.; 26–33 — F. expolitus sp.n.; 34–41 — F. proximus sp.n.; 19–22, 26–29, 34– 37 — genitalia; 23–24 — posterior half of genitalia; 25, 30, 38 — spermatophore; 31, 39 — right epiphallic ectoparameres; 32, 40 — left epiphallic ectoparameres; 33, 41 — rachis without base; 19, 26, 34 — dorsal view; 20, 27, 33, 35, 41 — ventral view; 21, 28, 36 — left view; 22, 29, 37 — right view; 23 — ventral / slightly lateral view; 24 — ventral / slightly anterior view; 25, 30–32, 38–40 — lateral view.