Isonychia guixiensis Wu et al., 1992

Qiang, Xin-He & Zhou, Chang-Fa, 2023, A preliminary review of Isonychia Eaton, 1871 from Chinese mainland with a re-description of I. kiangsinensis Hsu, 1936 (Insecta, Ephemeroptera, Isonychiidae), ZooKeys 1178, pp. 115-141 : 115

publication ID

https://dx.doi.org/10.3897/zookeys.1178.104619

publication LSID

lsid:zoobank.org:pub:D2371186-B406-4F65-9AA5-EB961F9D7D0C

persistent identifier

https://treatment.plazi.org/id/2A942885-FB09-5C21-BF35-2BDA6808203E

treatment provided by

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scientific name

Isonychia guixiensis Wu et al., 1992
status

 

Isonychia guixiensis Wu et al., 1992 View in CoL

Isonychia guixiensis Wu et al., 1992: 78 (male, female). Type from Jiangxi province, China; You and Gui 1995: 25 (male); Gui and Zhou 1999: 126.

Isonychia sinensis Wu et al., 1992: 79 (male, female). Type from Jiangxi province, China; You and Gui 1995: 27 (male); Su and Zhu 1997: 121 (egg) (synonymized by Zhou 2013: 196).

Material examined.

Holotype of I. guixiensis (male imago), Guixi City , Jiangxi Province, China, 4-6-VI-1990, collected by Lixin Tian, Lianfang Yang; paratypes of I. guixiensis : 10 male imagos and 12 female imagos, same data as the holotype . Holotype of I. sinensis (male imago), Guixi City , Jiangxi Province, China, 4-6-VI-1990, collected by Lixin Tian, Lianfang Yang; paratypes of I. sinensis : 5 male imagos and 13 female imagos, same data as the holotype .

Diagnosis.

The male of I. guixiensis has transparent wings (Fig. 1A, B View Figure 1 ), dark brown forefemora, foretibiae, apical half of tarsal segment I-IV and tarsal segment V (Fig. 1D View Figure 1 ). Its abdominal terga are brown with a pale median line and dark longitudinal submedian stripes (Fig. 1E View Figure 1 ). The penes are nearly cylindrical with pointed apicolateral angles, and membranous processes beneath penes are clear (Fig. 1F-H View Figure 1 ). The females are similar to the males, with concave sternum IX (Fig. 1C View Figure 1 ).

This species and I. kiangsinensis can be found sympatrically in Jiangxi province, central China. They can be differentiated by the following characters: (1) I. guixiensis is smaller than I. kiangsinensis ; (2) the body of I. guixiensis is brown to dark brown (Fig. 1E View Figure 1 ) while the body of I. kiangsinensis is usually pink to reddish; (3) I. guixiensis has distinct brown markings on abdomen (Fig. 1E View Figure 1 ) while the I. kiangsinensis has none. (4) their penes are dissimilar: those of I. kiangsinensis are triangular but penes of I. guixiensis are nearly cylindrical with pointed apicolateral angles (Fig. 1G View Figure 1 ).

Description.

See Wu et al. (1992).

Distribution.

China (Jiangxi province).

Remarks.

Wu et al. (1992) named two species, I. guixiensis and I. sinensis , in a single paper, with the penes of I. guixiensis appearing remarkably small. After checking all types of those two species, we found no difference between them, and their abdominal markings are absolutely less distinct than those in the original figures of Wu et al. (1992), and the synonymy of two species is confirmed here. Because the name of I. guixiensis is before I. sinensis in the same paper, the former is retained as the valid name.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Ephemeroptera

Family

Isonychiidae

Genus

Isonychia

Loc

Isonychia guixiensis Wu et al., 1992

Qiang, Xin-He & Zhou, Chang-Fa 2023
2023
Loc

Isonychia sinensis

Wu & Gui 1992
1992