Research Article |
Corresponding author: Fu-Ming Shi ( shif_m@126.com ) Academic editor: Fernando Montealegre-Z
© 2016 Fu-Ming Shi, Xun Bian, Li-Ying Guo.
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:
Shi F-M, Bian X, Guo L-Y (2016) First record of the genus Dialarnaca Gorochov, 2005 from China, with description of two new species (Orthoptera, Gryllacrididae, Gryllacridinae). ZooKeys 558: 1-8. https://doi.org/10.3897/zookeys.558.6165
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In the present paper, Dialarnaca Gorochov, 2005 is recorded from China for the first time, with two new species of the genus described, Dialarnaca longicerca Shi & Bian, sp. n. and Dialarnaca zhoui Shi & Bian, sp. n. A key and a distribution map of the genus Dialarnaca, are provided.
Gryllacrididae , Gryllacridinae , new record genus, Dialarnaca , new species, China
Dialarnaca was first proposed by
Specimens in this study were collected from tropical area of southern China. Morphological structures were examined and measured using Leica M205A stereomicroscope. Leica DFC 450 digital imaging system was used to obtain morphological images. The map was drawn using ArcGIS 10.2 based on the occurrence points. The specimens were deposited in the Museum of Hebei University, China.
All measurements of length are in millimetres. The following abbreviations were used for the specimen measurements: body w/wings – the distance from the apex of fastigium verticis to the apex of tegmina; body w/o wings – in male, the distance from the apex of fastigium verticis to the posterior margin of tenth abdominal tergite, in female, the distance from the apex of fastigium verticis to the apex of epiproct; pronotum – the straight-line distance from the anterior margin of pronotum to posterior margin; tegmen – the distance from the base of tegmen to apex; hind femur – the distance from the base of hind femur to the apex of genicular lobe; ovipositor – the distance from the base of subgenital plate to the apex of ovipositor.
Dialarnaca
:
Dialarnaca roseola Gorochov, 2005, by original designation.
Body medium, form slender. Eyes kidney-shaped, prominent; ocelli small, inconspicuous. Humeral sinus of pronotum distinct. Tegmina and hind wings developed, far surpassing apices of hind femora; M vein of tegmina simple, free, not united with R vein. Fore coxae with one small spine; fore and middle femora unarmed on ventral surface, tibiae with five pairs of movable ventral spines (including a pair of apical spines); middle tibiae with an inner apical spine on dorsal surface. Hind femora with two rows of minute spines on ventral surface; tibiae with two rows of spines on dorsal surface, subapices with 1 pair of spines on ventral surface, apices with one pair of dorsal spines, the inner one obviously longer than outer one, and two pairs of ventral spines. Second and third abdominal tergites with two rows of transverse stridulatory teeth on lateral margins separately. MALE: ninth abdominal tergite without any hook, centre of posterior margin with a large tubercular process, the angular apex of which slightly directing downwards; tenth abdominal tergite in the form of transverse sclerite, posterior area projecting backwards, membranous, the apex with 1 pair of heavily sclerotized hooks, which curved upwards; subgenital plate variable with well-developed styli; genitalia entirely membranous. FEMALE: posterior area of seventh abdominal sternite projecting backwards; basal area of subgenital plate with numerous rugulae.
The genus can be identified by the following characters: male ninth abdominal tergite without any process, posterior area of tenth abdominal tergite membranous with one pair of sclerotized apical hooks, which curved upwards. Because only one female is known, the diagnosis of the genus is insufficient.
1 | Apical area of male cerci curly, styli shorter (0.23–0.24 mm), about 3.92–4.43 times shorter than the length of male subgenital plate along the midline | Dialarnaca longicerca sp. n. |
– | Male cerci straight, styli longer, about 2.33–2.47 times shorter than the length of male subgenital plate along the midline | 2 |
2 | Posterior area of male subgenital plate slightly projected, posterior margin shallowly concave in the middle | Dialarnaca roseola |
– | Posterior area of male subgenital plate trapezoidal projected, posterior margin nearly straight | Dialarnaca zhoui sp. n. |
Holotype: male, pinned, China, Hainan, Changjiang, Bawangling, 26 May 2014, coll. by Jiao Jiao. Paratypes: 1 male and 1 female, pinned, China, Hainan, Changjiang, Bawangling, 13 July 2010, coll. by Ming Qiu and Rui-Lian Li.
This species differs from the Dialarnaca roseola Gorochov, 2005 in body green, male cerci longer and apical area curled, posterior margin of male subgenital plate slightly concave in the middle, styli shorter.
Male. The following characters are in addition to those given in the generic description. Fastigium verticis broad, about 1.5–1.7 times as wide as scape (Fig.
Female. Differs from male in following characters: cerci slender, apices acute. Seventh abdominal sternite long, both sides of four fifths apical area slightly concave, posterior area projecting backwards, centre of posterior margin slightly concave (Figs
Coloration. Body green. Eyes black-brown. Apices of hooks of tenth abdominal tergite blackish.
(mm). Male: body w/wings 33.2–34.0, body w/o wings 18.7–20.5, pronotum 4.5–5.0, tegmen 28.7–29.2, hind femur 11.8–12.4; female: body w/wings 34.0, body w/o wings 21.2, pronotum 5.3, tegmen 28.0, hind femur 11.7, ovipositor 14.0.
The name is derived from the longer cerci of male.
Holotype: male, pinned, China, Yunnan, Jinping, Pinghe, 12 June 2009, coll. by Fu-Ming Shi.
This species differs from Dialarnaca roseola Gorochov, 2005 and Dialarnaca longicerca Shi & Bian, sp. n. by: the posterior area of male subgenital plate trapezoidal projected, styli located on lateral margins near middle area of subgenital plate. In Dialarnaca roseola, posterior area of male subgenital plate slightly projected, centre of which with 1 shallow concavity. It can be distinguished from Dialarnaca longicerca sp. n. by the shape of male cerci and subgenital plate.
Male. Fastigium verticis broad, about 1.5 times as wide as scape. Eyes ovoid; ocelli conspicuous. Scape about three-quarters length of eye, pedicel about half as long as scape (Fig.
Female. This species is known only from the holotype.
Coloration. Body reddish yellow. Labrum yellow, eyes brown, ocelli yellow. Spines of all legs black.
(mm). Male: body w/wings 42.0, body w/o wings 23.7, pronotum 6.5, tegmen 35.5, hind femur 18.3.
China (Yunnan).
This species is named in honour of Dr. Shan-Yi Zhou who provided much assistance in collecting specimens.
This project is supported by the National Natural Science Foundation of China (No. 31071955, 31201731), the Key Laboratory of Zoological Systematics and Application, Hebei University (No. 14967611D) and the Orthoptera Species File Grants.