Regulaneuria Zhou, 2021

Mu, Pengxu & Huang, Xiaolei, 2023, Revision of the genus Regulaneuria (Ephemeroptera, Heptageniidae, Ecdyonurinae), with description of a new species, Zootaxa 5353 (3), pp. 235-249 : 237

publication ID	https://doi.org/ 10.11646/zootaxa.5353.3.2
publication LSID	lsid:zoobank.org:pub:DAA8680A-A064-407F-94D0-F20D5F57B2CE
DOI	https://doi.org/10.5281/zenodo.10267842
persistent identifier	https://treatment.plazi.org/id/14558B19-FFE4-FFEA-0EC9-209DFD137A5C
treatment provided by	Plazi
scientific name	Regulaneuria Zhou
status

Treatment

Genus Regulaneuria Zhou (in Lei, Gong, Zhang & Zhou), 2021

Genus Regulaneuria Zhou (in Lei et al.) 2021: 2 (imagos, subimagos, nymph, egg).

Type species: Regulaneuria cingulata ( Navás, 1933)

Diagnosis. Male imago. Compound eyes not contiguous, widely separated by a distance 2.5-3.0 times frontal ocellus width ( Fig. 2A View FIGURE 2 ). Number of crossveins on forewing reduced (less than 18 in costal and subcostal fields), most crossveins obviously pigmented; almost all crossveins of forewing, except those in costal and subcostal fields and wing base, regularly or roughly arranged into 5 – 6 rows ( Figs 2D View FIGURE 2 , 7A – D View FIGURE 7 ); hindwing with brown pigmentation along outer margin at distal half ( Fig. 2D View FIGURE 2 ). First tarsal segment of foreleg 0.7 – 0.8 times second one length; midtarsus longer than midtibia ( Fig. 2C View FIGURE 2 ). Styliger convex medially and with a pair of sublateral projections ( Fig. 3E View FIGURE 3 ); penes almost totally fused with median titillators ( Figs 3E – F View FIGURE 3 ).

Female imago. Subgenital plate greatly elongated posteriorly reaching the posterior margin of sternum VIII; subanal plate tongue-shape, elongated and narrowed ( Fig. 3G View FIGURE 3 ).

Nymph. Pronotum expanded laterally, wider than head. Labrum not or slightly expanded laterally with round apex ( Figs 5B, C View FIGURE 5 ); superlingua curved with relatively sharpened tip ( Fig. 5F View FIGURE 5 ); maxillae with two distal dentisetae (proximal one bifurcated) and one proximal dentiseta (bifurcated, with one branch fringed) ( Figs 5H View FIGURE 5 , 8G View FIGURE 8 ). Supracoxal spurs present but rounded or bluntly developed ( Fig. 6B View FIGURE 6 ). Bristles on upper faces of femora with more or less truncated apex; hindleg with pinnate (lateral margins serrated) bristles on inner surface of tibia and tarsus ( Figs 8A – F View FIGURE 8 ). Lamellae of tergalius I with anal margin extended; tergalius VII with basal half convex and apical half narrowed ( Fig. 6E View FIGURE 6 ). Caudalii with whorls of spine-like setae on each segment, primary swimming setae lost ( Fig. 6F View FIGURE 6 ).

Egg. Ovoid; chorion irregularly covered by small KCTs on whole surface; micropyle with single margin ( Figs 8H, I View FIGURE 8 ).

Species composition. Regulaneuria chongchongae sp. nov.: Hainan Province, China Regulaneuria cingulata : Zhejiang Province, China

Discussion. Regulaneuria can be easily distinguished from all other Ecdyonurinae genera by the combination of the following characters: in the imaginal stage, A) compound eyes not contiguous and widely separated by a distance 2.5 – 3.0 times frontal ocellus width; B) most crossveins on forewing, except those in costal and subcostal fields and wing base, regularly or roughly arranged into 5 – 6 rows; hindwing with brown pigmentation along outer margins at distal half; C) penes almost totally fused; and in the nymphal stage, A) maxillae with two distal dentisetae (proximal one bifurcated) and one proximal dentiseta (bifurcated, with one branch fringed; B) bristles on inner surface of hindtibia and hindtarsus with lateral margins serrated; C) lamellae of tergalius I with anal margin extended; tergalius VII with basal half convex and apical half narrowed.