Polyplocia orientalis
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Ordo: Ephemeroptera
Familia: Euthyplociidae
Genus: Polyplocia
Name
Polyplocia orientalis Nguyen & Bae, 2003 – Wikispecies link – Pensoft Profile
- Polyplocia orientalis Nguyen & Bae, 2003a: 280, figs 1–2, original description (nymph).
- Polyplocia orientalis (Gonçalves and Peters 2016[1]: 558, nymph).
- Polyplocia spp. (Gonçalves and Peters 2016[1]: 558, possible nymph (Thailand)).
- Polyplocia orientalis (Zheng et al. 2023[2]: 2, figs 1–9, male and female imago, egg, nymph).
Material examined
Thailand: Eleven nymphs in alcohol, deposited in ZMKU, Chiang Rai province, Phan district, Pu Kaeng waterfall, 19°26'53.7"N, 99°41'83.6"E, 540 m, 5.III.2021, S. Kwanboon leg. Three nymphs in alcohol, deposited in VMCMU, Chiang Rai province, Phan district, Pu Kaeng waterfall, 19°26'53.7"N, 99°41'83.6"E, 540 m, 29.I.2023, S. Chanaporn leg. Two nymphs in alcohol, deposited in ZMKU, Thailand, Chiang Mai province, Chiang Dao district, Huay Mae Mae, 19°19'31.1"N, 99°58'84.6"E, 809 m, 20.XI.2018, C. Damrong leg.
Diagnosis
Imago: i) membrane of wings transparent and colourless, and ii) T-shaped male penis with apical depression on both lobes (Zheng et al. 2023[2]). Nymph: i) large body size (25.0–46.4 mm), ii) yellowish abdominal sterna without anterolateral black mark, iii) spines on 1/3 of tusk length distally, and iv) apically expanded dorsal lobe of gill I (Nguyen and Bae 2003a[3]; Zheng et al. 2023[2]).
Description
Male imago. See Zheng et al. (2023)[2].
Female imago. See Zheng et al. (2023)[2].
Nymph. See also Nguyen and Bae (2003a)[3] and Zheng et al. (2023)[2].
Variability and additional description
(Thai specimens). Nymph. Male body length 17.22 mm; cerci length 11.78 mm; median filament length 10.5 mm. Female body length 27.9 mm; cerci length 18.5 mm; median filament length 16.2 mm.
Head. Length 2× of maximum width; narrower than pronotum. Compound eye black on dorsolateral margin. Antenna 8.8 mm in length; scape with at least three short setae. Mouthpart. Labrum (Fig. 5A) shallow, concave at anteromedian margin, with a tuft of dense long, simple setae; anterior margin with a row of 14–16 long, simple setae; dorsal surface with long, fine setae and short, simple setae scattered over area. Mandibular tusks (Fig. 5E) strongly arched inward (18.6° in curvature); a row of simple setae on base of tusks; ventrally almost bare. Right mandible without prostheca. Left mandible with prostheca as long as incisors, truncate, broader apically. Maxillary palp (Fig. 5D) 1st segment with a few of long, fine setae on outer margin; 2nd segment with lateral long, hair-like setae in both inner and outer margin; 3rd segment long, at least 6 × longer than wide, apically pointed, with numerous of long, hair-like setae on lateral inner margin and scattered over half of segment apically. Hypopharynx (Fig. 5B) lingua cordiform; superlingua extended laterally. Labium (Fig. 5C) paraglossae articulate above glossae; labial palpi 1st segment with long, hair-like setae on outer margin and fine, simple setae on inner margin; 2nd segment with long, hair-like setae on outer margin; 3rd segment much broader than 2nd segment, apically truncated almost straight with a tuft of stout, simple setae, with long, hair-like setae on outer margin and fine, simple setae on inner margin. Legs. Ratio of forelegs: midlegs: hindlegs 1:0.7:0.7; ratio of foreleg segments 1:1.2:0.7:0.4; ratio of midlegs segments 1:1:0.4:0.2 with moderately developed setae; ratio of hindleg segments 1:0.6:0.2:0.1, lack setae on femora.
Female subimago. Egg. (Fig. 6) Dissected from female subimago; length 272 μm, width 214 μm; oval-shaped; no polar caps or other attachment structures; rough chorionic surface, mesh-like with irregular raised ridges (Fig. 6B); two visible linear micropyles formed with micropyle canal on the surface (Fig. 6C). In this study, Thai Polyplocia orientalis showed some variation in these characters combined: i) Labrum slightly concave on anterior margin, nearly straight, ii) tusks cylindrical pointed apically, strongly arched inward (18.6° curvature) and outer margin with 7–9 larger spines on 1/3 of tusk length distally, and iii) eggs oval-shaped with two visible micropores.
Distribution
China (Yunnan), Vietnam (Dak Lak, Lam Dong, Thua Thien Hue), Thailand (Chiang Rai, Chiang Mai, Phrae, Phayao, Nan) (Nguyen and Bae 2003a[3], Gonçalves and Peters 2016[1], Zheng et al. 2023[2], this study).
Taxon Treatment
- Kwanboon, S; Boonsoong, B; Suttinun, C; 2023: Taxonomic review of the Oriental genus Polyplocia Lestage, 1921 (Ephemeroptera, Euthyplociidae), with two new records for Thailand ZooKeys, 1179: 197-217. doi
Images
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Other References
- ↑ 1.0 1.1 1.2 Gonçalves I, Peters J (2016) A new species of Polyplocia Lestage from Malaysia with comments on the genus (Ephemeroptera, Euthyplociidae, Euthyplociinae).Zootaxa4184(3): 553–560. https://doi.org/10.11646/zootaxa.4184.3.9
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Zheng X, Qiang X, Zhou C (2023) First nymph-imago association in Polyploica confirming the distribution of Euthyplociidae (Ephemeroptera) in China.Deutsche Entomologische Zeitschrift70(1): 1–11. https://doi.org/10.3897/dez.70.96986
- ↑ 3.0 3.1 3.2 Nguyen V, Bae Y (2003a) A new euthyplociid burrowing mayfly (Ephemeroptera: Euthyplociinae, Polymitarcyidae) from Vietnam.Korean Journal of Biological Sciences7(3): 279–282. https://doi.org/10.1080/12265071.2003.9647716
