Afronurus rubromaculatus ( You, Wu, Gui & Hsu, 1981 )

Zhang, Wei, Lei, Zhi-Ming, Li, Wen-Juan & Zhou, Chang-Fa, 2021, A contribution to the genus Afronurus Lestage, 1924 in China (Ephemeroptera: Heptageniidae, Ecdyonurinae), European Journal of Taxonomy 767 (1), pp. 94-116 : 110-111

Afronurus rubromaculatus ( You, Wu, Gui & Hsu, 1981)

Figs 6E , 7J–L , 12D , 13G–H

Cinygmina rubromaculata You, Wu, Gui & Hsu, 1981: 28 , pl. 2 figs 14–24 (male, female). Types: male, female, from Jiangsu, China.

Cinygmina hainanensis She, Gui & You, 1995: 72 , fig. 1 (male, female, male subimago). Types: male, female subimago from Hainan (synonymized by Zhou & Zheng 2003: 758).

Cinygmina rubromaculata – Gui 1985: 86. — Wu et al. 1986: 65, figs 1–11 (nymph). — Zhang & Cai 1991: 237. — You & Gui 1995: 52, fig. 51 (male).

Ecdyonurus rubromaculatus – Tshernova et al. 1986: 114.

Afronurus rubromaculatus – Braasch & Jacobus 2011: 65.

Material examined

Holotype CHINA • ♂; Jiangsu Province, Yi-Xing city, Ming-Ling village ; 31°10′5.02″ N, 119°40′17.52″ E; alt. 67 m; 15 Jul. 1980; T. Wu leg.; NNU.

Paratypes CHINA • 48 ♂♂, 27 ♀♀; same collection data as for holotype; NNU .

Additional material

CHINA • 6 ♂♂ (reared from mature nymphs), 7 ♂♂ subimagoes, 10 ♀♀, 8 ♀♀ subimagoes, 40 nymphs; Hunan Province, Zhang-Jia-Jie city, Jin-Bian creek ; 29°20′45.14″ N, 110°32′46.36″ E; alt. 253 m; 12 Aug. 2019; R. Lo and W. Zhang leg.; NNU .

Description

Nymph

See Zhou & Zheng (2003: 758, fig. 7, first description).

Male imago

See You et al. (1981: 28, figs 14–24, original description).

Egg ( Fig. 6E )

Ovoid, small KCTs concentrated at each pole, large KCTs and oval micropyle located equatorially.

Remarks

Compared to other Chinese congeners, A. rubromaculatus resembles A. obliquistriatus in the nymph because of the similar color patterns of the head and abdomen. However, the nymphal and imaginal stages of these two species can be identified by other characters, as mentioned in remarks for A. obliquistriatus .

Additionally, the genitalia of A. rubromaculatus have an obvious projection between divergent penial lobes ( Fig. 13G–H ), which makes it seems closer to the Vietnamese species A. cervina Braasch & Soldán, 1984 . Nevertheless, the particular color pattern (terga pale medially and reddish laterally) of A. rubromaculatus is unique and distinguishable in the genus ( Fig. 12D ). The nymphal characters of A. rubromaculatus , such as the pale dots on the head capsule and larger body size (8.0–12.0 mm), can help differentiate them effectively.

Distribution

China (Jilin, Liaoning, Hebei, Henan, Hubei, Hunan, Shaanxi, Sichuan, Guizhou, Jiangsu, Zhejiang, Guangdong, Hainan).

Figures

Fig. 6. SEM photos of eggs. A. Afronurus drepanophyllus sp. nov. (NNU). B. A. furcatus (Zhou & Zheng, 2003) (NNU). C. A. hunanensis (Zhang & Cai, 1991) (NNU). D. A. obliquistriatus (You et al., 1981) (NNU). E. A. rubromaculatus (You et al., 1981) (NNU). F. A. yixingensis (Wu & You, 1986) (NNU).

Fig. 7. Nymphal habitus of five species of Afronurus Lestage, 1924. A–C. A. furcatus (Zhou & Zheng, 2003) (NNU). D–F. A. hunanensis (Zhang & Cai, 1991) (NNU). G–I. A. obliquistriatus (You et al., 1981) (NNU). J–L. A. rubromaculatus (You et al., 1981) (NNU). M–O. A. yixingensis (Wu & You, 1986) (NNU). A, D, G, J, M. Head capsule. B, E, H, K, N. Abdominal terga. C, F, I, L, O. Caudal filaments. Scale bars: A–B, D–E, G–H, J–K, M–N = 2.0 mm; C, F, I, L, O = 1.0 mm.

Fig. 12. Male abdominal terga of five species of Afronurus Lestage, 1924. A. A. furcatus (Zhou & Zheng, 2003) (NNU). B. A. hunanensis (Zhang & Cai, 1991) (NNU). C. A. obliquistriatus (You et al., 1981) (NNU). D. A. rubromaculatus (You et al., 1981) (NNU). E. A. yixingensis (Wu & You, 1986) (NNU). Scale bars = 1.0 mm.

Fig. 13. Genitalia of five species of Afronurus Lestage, 1924. A–B. A. furcatus (Zhou & Zheng, 2003) (NNU). C–D. A. hunanensis (Zhang & Cai, 1991) (NNU). E–F. A. obliquistriatus (You et al., 1981) (NNU). G–H. A. rubromaculatus (You et al., 1981) (NNU). I–J. A. yixingensis (Wu & You, 1986) (NNU). A, C, E, G, I. Genitalia. B, D, F, H, J. Penes enlarged; arrows show titillators. Scale bars: A, C, E, G, I = 0.5 mm; B, D, F, H, J = 0.2 mm.