Research Article |
Corresponding author: Fuming Shi ( shif_m@126.com ) Academic editor: Ming Kai Tan
© 2020 Tao Wang, Fuming Shi.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Wang T, Shi F (2020) Two new species of the tribe Meconematini (Orthoptera: Tettigoniidae: Meconematinae) from China and male song characters of Pseudocosmetura yaoluopingensis sp. nov. Journal of Orthoptera Research 29(2): 115-120. https://doi.org/10.3897/jor.29.49821
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This paper describes two new species of the tribe Meconematini from China, Acosmetura longielata sp. nov. and Pseudocosmetura yaoluopingensis sp. nov. Data on the male song characters of Pseudocosmetura yaoluopingensis sp. nov. are also provided. The type specimens of all new species are preserved in the Museum of Hebei University.
Acosmetura, calling song, morphology, taxonomic images, type specimens
Up to now, 19 brachypterou genera of Meconematini have been recorded from China, 13 of which are endemic to China (
The genus Pseudocosmetura was proposed by
As for acoustic studies of Meconematini from China, only
This paper reports two new species—Acosmetura longielata sp. nov. and Pseudocosmetura yaoluopingensis sp. nov.—and their morphological characters are illustrated. All type specimens examined are preserved in the Museum of Hebei University (
Specimens were examined with a Nikon-SMZ-1500 stereomicroscope. Morphological images were acquired using a Leica M205A digital imaging system. The following conventions were adopted for the specimen measurements: body length: distance from apex of fastigium verticis to posterior margin of tenth abdominal tergite; pronotum length: distance from anterior to posterior margins of pronotum; hind femur length: distance from base of hind femur to apex of genicular lobes; ovipositor length: distance from base of subgenital plate to apex of ovipositor.
The calling songs of Pseudocosmetura yaoluopingensis sp. nov. were recorded in the field using a Pettersson D1000X with a sampling rate at 192 kHz. The materials are as follows: P. yaoluopingensis sp. nov., three males, 18–19 September 2019, collected by Tao Wang and Yanqing Li. In total, 90 recordings were recorded and analyzed. Sound measurements and power spectra were obtained using Audacity. Spectral analysis was taken from each syllable using the mean of 512 points in a Fast Fourier Transformation weighted with a Hanning window. Oscillogram of the song was acquired using Matlab R2018a. The recordings of P. yaoluopingensis sp. nov. were recorded at 21°C. The insects were placed in a nylon cage with a microphone at distances between 10 to 15 cm.
Song terminology.—Echeme: a first-order assemblage of syllables; echeme duration: time period measured from the first syllable to the last; echeme interval: time period measured from two neighboring echemes; syllable: sound produced during one cycle of tegmina movements; syllable period: time period measured from the start of one syllable to the next (reciprocal value: syllable repetition rate); impulse: a simple, undivided, transient train of sound waves.
Acosmetura brevicerca Liu, 2000
The genus is characterized by the male tenth abdominal tergite with a shallow concavity on posterior margin; subgenital plate longer than wide; genitalia sclerotized, exposed, not surpassing the posterior margin of subgenital plate. Margins of ovipositor smooth or with small teeth.
Holotype: CHINA • ♂, Guangdong, Ruyuan, Nanling, 15.VI.2019, leg. Tao Wang,
Male. Body small. Fastigium verticis conical, narrower than antennal scape, blunt apically and grooved dorsally. Eyes faintly globular, obviously protruding forward and outward. Apical segment of maxillary palpus longer than subapical one; apex slightly swollen, truncate.
Pronotum long, distinctly prolonged posteriorly, reaching middle part of seventh abdominal tergite; anterior margin straight while posterior margin obtusely rounded (Fig.
Tegmina short, completely covered by pronotum, overlapping, invisible in lateral view; hind wings absent.
All femora unarmed ventrally, genicular lobes with apices obtuse. Fore coxae with 1 short spine; tibiae with 5 spines respectively on both sides of ventral surface, tibial tympana open on both sides, ovoid. Middle tibiae with 5 inner and 6 outer spines on ventral surface. Hind tibiae with 2–3 spines on both sides of ventral surface as well as 22–26 spines on both sides of dorsal surface, bearing two pairs of ventral apical spurs and one pair of dorsal apical spurs.
Lateral margins of ninth abdominal tergite slightly prolonged posteriorly (Fig.
Female. Pronotum slightly shorter than male, posterior margin reaching middle part of second abdominal tergite; anterior margin somewhat straight while posterior margin obtusely rounded (Fig.
Body yellowish green, green when alive. Eyes brown. Disc of pronotum with 1 broad longitudinal light brown stripe, of which lateral margins black-brown, outer margins of stripe with 1 longitudinal yellowish white stripe, not reaching posterior margin of pronotum (Fig.
Body: ♂10.2–11.6, ♀11.4–12.9; pronotum: ♂7.5–8.6, ♀5.8–6.3; hind femora: ♂10.1–11.3, ♀11.8–13.0; ovipositor: 7.7–8.2.
CHINA • 1♀, Guangdong, Ruyuan, Nanling, 11.VI.2019, leg. Tao Wang,
China (Guangdong, Hunan).
According to the caudal morphological characters of the male, this new species belongs to the genus Acosmetura. The differences between this new species and the known species of the genus Acosmetura are as follows: pronotum long, distinctly prolonged posteriorly, metazona rather strikingly elevated; female subgenital plate nearly trapezoidal, lateral margins and posterior margin somewhat expanded dorsad while posterior margin straight, approaching lateral margins with a V-shaped carina.
The name of this new species is derived from the male pronotum that is long and the metazona that is strongly elevated. In Latin, “long-” means long and “elat-” means elevated.
Acosmetura longielata sp. nov.: A–B, D–E. Pronotum: A, D. Dorsal view; B, E. Lateral view; C, G, I, K–L. Apex of abdomen: C, L. Lateral view; G, K. Dorsal view; I. Latero-dorsal view; F, H. Subgenital plate in ventral view; J. Right cercus in lateral view. A–C, G–J. Male; D–F, K–L. Female. Scale bars: 2 mm (A–B, D–E, L); 1 mm (C, F–H, K); 500 μm (I–J).
Pseudocosmetura fengyangshanensis Liu, Zhou & Bi, 2010
The genus is characterized by the male tenth abdominal tergite normal, epiproct distinct or absent; cerci long; genitalia sclerotized, somewhat short. Ovipositor stout, moderately bent dorsad.
Holotype: CHINA • ♂, Anhui, Yuexi, Yaoluoping, 19.IX.2019, leg. Tao Wang,
Male. Body small, somewhat robust. Fastigium verticis conical, apex obtusely rounded with a longitudinal sulcus on dorsal surface. Eyes approximatively globular and distinctly protruding forward and outward. Apical segment of maxillary palpus longer than subapical one, slightly swollen apically, truncate.
Pronotum feebly long, reaching middle part of second abdominal tergite; anterior margin straight while posterior margin arc-shaped (Fig.
Tegmina short, covered by pronotum, visible in lateral view; hind wings absent.
All femora unarmed ventrally, genicular lobes with apices obtuse. Fore coxae with 1 small spine; fore tibiae with 5 spines respectively on inner and outer sides of ventral surface, tympanal organs open on both sides, ovoid. Middle tibiae with 4 inner and 5 outer spines on ventral surface. Hind tibiae with 21–24 spines separately on both sides of dorsal surface, bearing one pair of ventral apical spurs and one pair of dorsal apical spurs.
Lateral margins of ninth abdominal tergite strongly prolonged posteriorly (Fig.
Female. Pronotum slightly shorter than male, reaching posterior margin of first abdominal tergite, metazona not raised (Fig.
Body yellowish green, green when alive. Eyes brown. Disc of pronotum with 1 longitudinal light brown stripe, of which lateral margins black brown, outer margins of stripe with yellowish white longitudinal stripe severally (Fig.
Body: ♂ 9.2–10.8, ♀10.3–12.5; pronotum: ♂4.3–4.7, ♀3.6–4.4; hind femora: ♂8.6–9.5, ♀9.5–10.7; ovipositor: 6.6–7.8.
CHINA • 1♂, Anhui, Yuexi, Yaoluoping, 18.IX.2019, leg. Yanqing Li,
The male calling song of this species is performed only at night and is inaudible to humans. Both echeme duration (3–35 s) and echeme interval (1.6–8.5 s) are irregular (Fig.
China (Anhui).
This new species resembles Pseudocosmetura anjiensis (Shi & Zheng, 1998), but differs in the following: male tenth abdominal tergite expanded posteriorly, with a U-shaped concavity in the middle, lateral lobes conical, bent inward and backward, terminals somewhat blunt; female tenth abdominal tergite short and broad, center of posterior margin concave, lateral angles somewhat blunt; subgenital plate trapezoidal, longer than wide.
The name of the new species is derived from the type locality, Yaoluoping.
Pseudocosmetura yaoluopingensis sp. nov.: A–B, D–E. Pronotum: A, D. Dorsal view; B, E. Lateral view; C, F, G, K. Apex of abdomen: C, K. Lateral view; F–G. Dorsal view; H, J. Subgenital plate in ventral view; I. Right cercus in latero-dorsal view; A–C, G–I. Male; D–F, J–K. Female. Scale bars: 2 mm (K); 1 mm (A–H, J); 500 μm (I).
We are grateful to the collectors for specimens. We thank the Yaoluoping National Nature Reserve for permitting research. This project is supported by the National Natural Science Foundation of China (No. 31372232, 31672259, 31872268), Post-graduate’s Innovation Fund Project of Hebei University (hbu2019ss024), and the support of the Orthopterists’ Society.