Labiobaetis
Creators: name: Shi, Weifang
name: Tong, Xiaoli
Publisher: name: Zenodo
Year: 2014
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Ephemeroptera
Baetidae
Labiobaetis

description: Key to known mature nymphs of Oriental Labiobaetis species
(excluding 4 species which are known only from the imago stage)
1. Six pairs of gills (abdominal segment I without a pair of gills)................................................. 2
- Seven pairs of gills (abdominal segment I with a pair of gills)................................................... 9
2 Hind wing pads present or reduce to small vestige............................................................ 3
- Hind wing pads absent................................................................................. 6
3 Plane of right mandible between incisor base and molar region with a distinct protuberance........................... 4
- Plane of right mandible between incisor base and molar region smooth without any protuberance...................... 5
4 Posterior marginal spines rounded on terga I–IV, but getting narrower and longer on terga V-X; coloration of all abdominal terga pale except for tergum V with a dark brown irregular marking................................................................................................ L. ordinatus (Müller-Liebenau & Hubbard) n. comb. (Sri Lanka)
- Posterior marginal spines rounded with wide base on all terga; coloration of all abdominal terga brown except for 2 pairs of small cream submedial dots on each tergum................. L. numeratus (Müller-Liebenau) n. comb. (China, Malaysia)
5 Labrum submarginal setae simple and glabrous; terminal segment of maxillary palpus slightly concave near apex............................................................. L. moriharai (Müller-Liebenau) n. comb. (Malaysia, Vietnam)
- Labrum submarginal setae spatulate and serrated apically; terminal segment of maxillary palpus with a distinct notch at mesoapical 1/3...................................................... L. mustus (Kang & Yang) n. comb. (China)
6 Antennal scape with a distinct lobe at distolateral margin...................................................... 7
- Antennal scape without lobe at distolateral margin; submarginal setae on labrum spatulate with serrated apex..................................................................... L. sumigarensis (Müller-Liebenau) n. comb. (Philippines)
7 Submarginal setae on labrum spatulate with un-serrated or round apex............................................ 8
- Submarginal setae on labrum spatulate with serrated or split apex...................................................................................................... L. molawinensis (Müller-Liebenau) n. comb. (Philippines)
8 Terminal segment of maxillary palpus with a slightly concave near apex; the 3rd segment of the labial palpus wider than the inner apical lobe of the 2nd segment................... L. geminatus (Müller-Liebenau & Hubbard) n. comb. (Sri Lanka)
- Terminal segment of maxillary palpus with a distinct concave near apex; the 3rd segment of the labial palpus nearly the same width as the inner apical lobe of the 2nd segment.............. L. diffundus (Müller-Liebenau) n. comb. (China, Malaysia)
9 Hind wing pads present................................................................................ 10
- Hind wing pads absent; submarginal setae on labrum feathered and in nearly contiguous row; antennal scape with a distinct lobe at distolateral margin...................................... L. difficilis (Müller-Liebenau) n. comb. (Malaysia)
10 Submarginal setae on labrum spatulate with serrated or split apex.............................................. 11
- Submarginal setae on labrum simple or feathered........................................................... 12
11 Abdominal terga II to IX each with a large contrasting anchor-shaped brown marking,........... L. ancoralis n. sp. (China)
- Abdominal terga II to IX each with a pair of small cream submedial oblique dashes and a pair of small cream submedial dots in midregion.......................................... L. atrebatinus orientalis (Kluge) (China, Japan, Korea, Russia)
12 Submarginal setae on labrum simple and glabrous........................................................... 13
- Submarginal setae on labrum feathered................................................................... 14
13 Posterior marginal spines on terga large; coloration of abdominal tergum V not paler than adjacent terga.................................................................. L. pulchellus (Müller-Liebenau & Hubbard) n. comb. (Sri Lanka)
- Posterior marginal spines on terga small; coloration of abdominal tergum V much paler than adjacent terga............................................................................ L. multus (Müller-Liebenau) n. comb. (Malaysia)
14 Hind wing pads about 1/3 the length of metanotum; terminal filament about 2/5 the length of cerci............................................................................... L. borneoensis (Müller-Liebenau) n. comb. (Malaysia)
- Hind wing pads slightly shorter than the length of metanotum; terminal filament about 3/5 the length of cerci.......................................................................... L. operosus (Müller-Liebenau) n. comb. (Malaysia)
description: Published as part of Shi, Weifang & Tong, Xiaoli, 2014, The genus Labiobaetis (Ephemeroptera: Baetidae) in China, with description of a new species, pp. 397-408 in Zootaxa 3815 (3) on pages 406-407, DOI: 10.11646/zootaxa.3815.3.5, http://zenodo.org/record/225975