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| Sichuana curvicercata Gu, Zheng & Yue, in Gu, Zheng, Jiang et Yue, 2023. |
Abstract
Four new species of Sichuana Shen & Yin, 2020 are described based on morphological comparison and molecular analysis: S. planicercata sp. nov., S. curvicercata sp. nov., S. longilamina sp. nov. and S. magnicerca sp. nov. Specimens showed some intraspecific variation of male tegmina and subgenital plates. The genes COI and 16S were used to analyze the genetic distance between species and COI was used to analyze the phylogenetic relationship of Sichuana.
Key Words: Drymadusini, genetic distance, revision, variation, veins
Orthoptera: Tettigoniidae: Tettigoniinae: Drymadusini
Genus Sichuana Shen & Yin, 2020
Type species: Sichuana cryptospina Shen & Yin, 2020.
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| Sichuana curvicercata sp. nov. A. Adult female; B–D. Adult male. |
Sichuana curvicercata Gu, Zheng & Yue, sp. nov.
Diagnosis: Differs from all other Sichuana species by male tenth abdominal tergite without projections at posterior margin (Fig. 6F); male cercus gradually curved ventrally with apex pointing dorsally (Fig. 6E, F, H), inner tooth thick and nearly straight, suddenly sharp and incurved at apex (Fig. 6E); female tenth abdominal tergite with a wide trapezoidal projection at posterior margin (Fig. 6G).
Etymology: The specific epithet is derived from a combination of the Latin ‘curvi’ meaning curved and ‘cercus’, describing the male cerci curved ventrally with the apex pointing dorsally. Chinese name: 弯尾川螽.
Sichuana longilamina Gu, Zheng & Yue, sp. nov.
Diagnosis: Differs from all other Sichuana species by notch of tenth abdominal tergite of male trapezoidal (Fig. 9 F); male cercus strongly incurved at an acute angle and pointing dorsally (Fig. 9E, F, H), inner tooth pointing dorsally (Fig. 9E); apex of male subgenital plate elongate, the long styli about one-third of length of subgenital plate (Figs 9H, 11C); notch of female tenth abdominal tergite trapezoidal (Fig. 9G).
Etymology: The specific epithet is derived from a combination of the Latin ‘longus’ meaning long and ‘lamina’ meaning plate, to describe its male subgenital plate which is distinctly longer than the cerci. Chinese name:长板川螽.
Sichuana magnicerca Gu, Zheng & Yue, sp. nov.
Diagnosis: Differs from all other Sichuana species by notch of male tenth abdominal tergite U-shaped; large and long male cercus beyond subgenital plate (Fig. 12F, H), inner tooth small, inserted in the most basal part of cercus (Fig. 12E); notch of female tenth abdominal tergite V-shaped (Fig. 12G). The related species S. cryptospina Shen & Yin, 2020 with a pair of projections covering the inner tooth at male tenth abdominal tergite, male cercus at an obtuse angle, and broader lateral field of male tegmen, thus being similar to S. magnicerca sp. nov. (Fig. 12).
Etymology: The specific epithet is derived from a combination of the Latin ‘magnus’ meaning huge and ‘cercus’, to describe its male cerci, large and longer than the subgenital plate. Chinese name: 巨钩川螽.
Sichuana planicercata Gu, Zheng & Yue, sp. nov.
Diagnosis: Differs from all other Sichuana species by its male tenth abdominal tergite with a pair of very short round projections at posterior margin (Fig. 2F); male cercus without distinct curve upward or downward (Fig. 2E, F, H), inner tooth far above the top of cercus in lateral view (Fig. 2 H); and lacuna of female tenth abdominal tergite rounded and deep, reaching to or near posterior margin of ninth abdominal tergite (Fig. 2G).The related species S. curvicercata sp. nov. with narrower lateral field of male tegmen and simple male tenth abdominal tergite, thus being similar to S. planicercata sp. nov. (Fig. 6I, F).
Etymology: The specific epithet is derived from a combination of the Latin ‘plani’ meaning flat, and ‘cercus’, describing the male cerci not bent ventrally or dorsally. Chinese name: 平尾川螽.
Conclusion:
Based on the morphological and molecular analysis above, we described four new species of Sichuana Shen & Yin, 2020, S. planicercata sp. nov., S. curvicercata sp. nov., S. longilamina sp. nov. and S. magnicerca sp. nov., and refined the diagnosis of the genus. This large sample suggests that variation in wing venation and the male subgenital plate is common within species in this genus.
Jun-Jie Gu, Chengjie Zheng, Su-Rong Jiang and Yanli Yue. 2023. Phylogeny of Genus Sichuana Shen & Yin, 2020 (Orthoptera, Tettigoniidae, Tettigoniinae) with Four New Species from Sichuan, China. Deutsche Entomologische Zeitschrift. 70(2): 337-355. DOI: 10.3897/dez.70.105870
