Megalogryllus (Megalogryllus) angustulus, Горохов, 2019
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publication ID |
https://doi.org/ 10.33910/2686-9519-2019-11-4-279-308 |
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persistent identifier |
https://treatment.plazi.org/id/EC70EF23-FFE2-FFC8-FF1E-BCBFDEC88B49 |
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treatment provided by |
Felipe |
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scientific name |
Megalogryllus (Megalogryllus) angustulus |
| status |
sp. nov. |
Megalogryllus (Megalogryllus) angustulus View in CoL sp. nov.
( Figs 87 View Figs 77–87 , 118 View Figs 100–119 , 121 View Figs 120–122 , 123–125 View Figs 123–128 )
http://zoobank.org/ NomenclaturalActs/ 74C96DDE-2EBC- 4AC4-BAAA-7E1D7C363DE7
Material. Holotype — male, Guyana, “ British Guiana : New River ”, 750 ft., 10–20. III.1938, C. Hudson ( ZIN) . Paratype — female, same data as for holotype but 1– 3.03.1938 ( ZIN). Both specimens determined as “ Megalogryllus molinai Chopard ” by B. Townsend and received by ZIN in exchange with Natural History Museum, London .
Description. Male (holotype). Body medium-sized for this subgenus. Colouration light brown with reddish tinge and following marks ( Fig. 121 View Figs 120–122 ): epicranium with light yellowish brown dorsum, reddish brown transverse band between eyes crossing lateral ocelli and reaching median ocellus, light reddish brown ocelli and brown eyes; antennae with brown flagellum; mouthparts with almost dark brown lower half of clypeus; pronotum with brown to dark brown wide band along posterior edges; legs with barely darkened apical part of femora, base and distal part of tibiae, and most part of tarsi; tegmina with lighter (semitransparent) membranes in region of oblique veins and between chords and posterior edge of mirror, and almost reddish brown basal and apical areas in dorsal field; visible parts of hind wings very light brown; abdomen light brown to brown with almost dark brown cerci. Head semiglobular but barely flattened in anterodorsal part; ocelli moderately large, located almost on one transverse line (lateral ocelli round, but median one transverse); rostrum between antennal cavities approximately 1.7 times as wide as scape, widely rounded in profile. Pronotum distinctly transverse, barely narrowing to head, with shallowly concave anterior and barely convex posterior edges ( Fig. 121 View Figs 120–122 ), and with rather low lateral lobes having ventral edge almost parallel to dorsal edge. Legs moderately long but stout; fore tibia with three strong (digging) apical spurs, moderately large and elongate outer tympanum, and rather small (but also elongate) inner tympanum; hind femur weakly widened (weakly thickened); hind tibia with three pairs of elongate articulated dorsal spines on distal part as well as with 8–9 outer and five inner non-articulated dorsal denticles on rest parts of this tibia (one of outer denticles located between articulated spines in left tebia; most proximal one of inner denticles longer, spine-like and almost articulated in both tibiae); hind basitarsus with 8–9 outer and 7–9 inner dorsal denticles. Tegmina almost reaching abdominal apex, with dorsal field as in Figs 118 View Figs 100–119 and 121 View Figs 120–122 , and with lateral field having very sparse crossveins and 10–11 longitudinal veins; latter veins parallel and located longitudinally in proximal two thirds but curved more or less downwards in distal third (one of these veins branching from distal part of Sc stock); hind wings significantly protruding beyond tegminal apices. Anal plate narrowly rounded at apex; genital plate somewhat longer than anal one but rather wide and slightly narrowing to widely rounded apex; genitalia with short epiphallus having widely rounded posteromedian notch, with short ectoparameres having their lateral edges clearly concave in middle part, with posterodorsal ectoparameral sclerite (pds) having spine-like apical process (spl) denticulated and direct- ed more downwards than backwards, with endoparameres having large (long) anterior apodemes, with rachis having anterior (sclerotized) part narrow in profile, and with rami having rather wide distal part strongly curved medially ( Figs 123–125 View Figs 123–128 ).
Female. General appearance as in male, but: reddish tinge less distinct; epicranium with darkened (brown) band located only between ocelli; clypeus and pronotum almost uniformly light brown; ocelli and labrum yellowish; tegmina light brown to yellowish with semitransparent some membranes in lateral field; dorsal tegminal field with 13–14 moderately regular and barely oblique longitudinal veins as well as rather numerous and somewhat irregular crossveins; lateral tegminal field with 9–10 longitudinal veins similar to those of male but more straight (crossveins in this field also very sparse); hind tibia with four outer and three inner non-articulated denticles (two inner ones spine-like and almost articulated); hind basitatsus with seven outer and five inner dorsal denticles; cerci brown with light brown bases. Genital plate transverse (shorter than anal plate) and slightly narrowing to widely truncate apex (posterolateral corners of this plate rounded); ovipositor short, but much longer than genital plate and with distal part more or less normal for Gryllini (i.e. specialized to digging; Fig. 87 View Figs 77–87 ).
Length in mm. Body: male 24, female 28; body with wings: male 30, female 36; pronotum: male 3.9, female 4.1; tegmina: male 16, female 22; hind femora: male 14, female 15.5; ovipositor 4.3.
Comparison. The new species is most similar to M. molinai , which was described by Chopard (1930) after a male (holotype) from Brazil (“ Brésil: Manaos”) and a female from Guyana (“Guyane anglaise”), but it is distinguished from the latter species as well as from M. clamosus (Southern Brazil) by the male tegmina with less numerous oblique veins, but mainly by the mirror of male tegmina clearly less transverse (compare Figs 116, 117 and 118 View Figs 100–119 ). Ratios of some structures in the male tegmina (mirror width / mirror length; mirror length / distance between mirror and stridulatory vein; length of apical area / mirror length) are approximately equal to 1.15, 1.2, 1.3 in the new species and 1.3, 1, 1.5 in M. molinai , respectively. From M. clamosus , the new species additionally differs in the male tegmina somewhat narrower and with longer apical area. The female paratype of M. molinai from Guyana may belong to M. angustulus in reality.
Etymology. The name of this species originates from the Latin word “angustus” (narrow) and means “narrowish” in English.
| ZIN |
Russian Academy of Sciences, Zoological Institute, Zoological Museum |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.