Triomicrus contus Shen and Yin

Shen, Jia-Wei, Yin, Zi-Wei & Li, Li-Zhen, 2015, Triomicrus Sharp of Eastern China (Coleoptera: Staphylinidae: Pselaphinae), Zootaxa 4007 (4), pp. 509-528 : 515-516

publication ID

https://doi.org/ 10.11646/zootaxa.4007.4.3

publication LSID

lsid:zoobank.org:pub:680E5EBB-05B4-457F-A27A-B2A52FBB28BD

DOI

https://doi.org/10.5281/zenodo.6098044

persistent identifier

https://treatment.plazi.org/id/BF1B8789-FF88-FFAA-93E5-FEC3BC8EFC2D

treatment provided by

Plazi

scientific name

Triomicrus contus Shen and Yin
status

sp. nov.

Triomicrus contus Shen and Yin View in CoL , new species

( Fig. 5 View FIGURE 5 )

Type material (5 ♂♂, 9 ♀♀). Holotype: China: ♂, labeled ‘ China: C. Zhejiang, Zhuji, Mt. W. Majian Town (马 剑镇), 29°43’23’’N, 119°59’08’’E, leaf litter, sifted, 200 m, 15.vi.2012, T.-X. Zhao leg.’ ( SNUC). GoogleMaps Paratypes: China: 1 ♀, same data as holotype ( SNUC); 1 ♀, labeled ‘ China: C. Zhejiang, Zhuji, Mt. W. Majian Town, 29°43’16’’N, 119°58’51’’E, leaf litter, sifted, 300 m, 30.vi.2012, T.-X. Zhao leg.’ ( SNUC); GoogleMaps 1 ♂, labeled ‘ China: W. Jiangxi Province, Yichun City, Mingyue Shan (明月山), 27°35’13’’N, 114°16’53’’E, mixed forest, leaf litter, wood, sifted & beating, ca. 1600 m, 22.x.2013, Peng, Shen & Yan leg.’ ( SNUC); GoogleMaps 3 ♂♂, 7 ♀♀, also from Mingyue Shan, ‘ 27°35’44’’N, 114°16’26’’E, mixed forest, leaf litter, wood, sifted & beating, ca. 1140 m, 23.x.2013, Peng, Shen & Yan leg.’ ( SNUC). GoogleMaps

Diagnosis. Antennomere XI with relatively deep impression surrounding slightly prominent, disc-like protuberance near base. Head lacking median vertexal carina. Pronotum finely punctate. Elytral subhumeral sulci absent. Profemora simple, protrochanters and protibiae lacking spur or spine, mesotibiae lacking denticle. Apical lamina of abdominal sternite VII broadest near the middle and arcuate toward apex. Aedeagus with right paramere strongly curved mesally, internal sac bearing several sclerotized spines and several densely hairy sclerites.

Description. Male ( Fig. 5 View FIGURE 5 A). Length 2.13–2.20 mm. Head longer than wide, HL 0.42–0.46 mm, HW 0.41– 0.43 mm, lacking median vertexal carina; lateral portions of frons finely punctate; each eye composed of about 35 facets. Antennomere XI ( Fig. 5 View FIGURE 5 B–C) with relatively deep impression surrounding slightly prominent disc-like protuberance near base, diameter of impression about half of segmental length. Pronotum wider than long, PL 0.40–0.44 mm, PW 0.49–0.52 mm, with fine punctation. Profemora simple, protrochanters and protibiae lacking spur or spine, mesotibiae lacking denticle. Elytra wider than long, EL 0.75–0.80 mm, EW 0.83–0.85 mm, smooth; subhumeral sulci absent. Abdomen wider than long, AL 0.48–0.52 mm, AW 0.78–0.82 mm; abdominal tergite IV (first visible tergite) with discal carinae extending to two-thirds of tergal length; abdominal sternite VII modified ( Fig. 5 View FIGURE 5 D), with apical lamina broadest near middle and obliquely arcuate toward apex. Length of aedeagus ( Fig. 5 View FIGURE 5 F) including parameres 0.42 mm, with right paramere strongly curved mesally, internal sac bearing several sclerotized spines and densely hairy sclerite.

Female. Similar to male; antennomere XI unmodified. Each eye composed of about 24 facets. Measurements: BL 1.95–2.10 mm, HL 0.40–0.45 mm, HW 0.40–0.41 mm, PL 0.38–0.42 mm, PW 0.48–0.51 mm, EL 0.68–0.73 mm, EW 0.78–0.80 mm, AL 0.46–0.50 mm, AW 0.78–0.80 mm.

Distribution. Eastern China: Zhejiang and Jiangxi.

Etymology. The specific epithet ‘ contus ’ means ‘a pike, lance’, referring to the shape of the apical lamina of sternite VII.

Remarks. Populations from the Majian Town and Mingyue Mountain exhibit only slight geographic variation. Apical lamina of abdominal sternite VII of the population from Majian Town ( Fig. 5 View FIGURE 5 D) is slightly more slender than in the population from Mingyue Mountain ( Fig. 5 View FIGURE 5 E). Illustrations of the aedeagus ( Fig. 5 View FIGURE 5 F–G) found in each population are provided here.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Staphylinidae

Genus

Triomicrus

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