Cloeon harveyi ( Kimmins, 1947 )

Noenrimnong, Chayanon, Suttinun, Chanaporn, Tungpairojwong, Nisarat & Boonsoong, Boonsatien, 2026, Taxonomic insights into the diversity of Cloeon Leach, 1815 (Ephemeroptera, Baetidae) in Thailand, ZooKeys 1266, pp. 1-39 : 1-39

Cloeon harveyi ( Kimmins, 1947)

Figs 3 A – C , 6 C, D , 9 A, B , 11 A, B , 14 A, B , 16 A, B , 22 A – D , 27 A , 28 B , 29 A

Procloeon harveyi Kimmins, 1947: 94, figs 2, 6, 10 (original description, male, female).

Procloeon harveyi Gillies 1949: 176 (record). Kimmins 1971: 314 (list). Hubbard and Peters 1978: 11. Hubbard and Srivastava 1984: 3. Kandibane et al. 2007: 743. Mukherjee et al. 2012: 55, figs 1–9 (nymph first description).

Cloeon harveyi ( Kimmins, 1947): Müller-Liebenau and Hubbard 1986: 538. Hubbard 1986: 248.

Material examined.

• 99 nymphs, 2 male subimagos, 52 male imagos, 21 female imagos, Bangkok Prov., Luang Suwannawajokkasikij 100 th Year Park , 13°50'54.5"N, 100°34'15.1"E, 1. VIII. 2024, C. Noenrimnong leg. ( ZMKU) ; • 14 nymphs, 6 male imagos, 4 female imagos, Bangkok Prov., Chalermprakiat 55 th Year Park , 13°51'17.0"N, 100°34'27.7"E, 1. VIII. 2024, C. Noenrimnong leg. ( ZMKU) ; • 20 nymphs, 1 female subimago, 11 male imagos, 6 female imagos, Bangkok Prov., Varunawan Park , 13°50'51.1"N, 100°33'45.9"E, 25. X. 2024, B. Boonsoong & C. Noenrimnong leg. ( ZMKU) ; • 21 nymphs, 9 male imagos, 7 female imagos, Bangkok Prov., Information Building 50 Years , 13°51'11.6"N, 100°34'11.9"E, 12. I. 2025, C. Noenrimnong leg. ( ZMKU) ; • 13 nymphs, 16 male subimagos, 16 female subimagos, 4 male imagos, 1 female imago, Bangkok Prov., Emarica Academy , 13°50'39.8"N, 100°33'54.4"E, 2. II. 2025, S. Kwanboon & C. Noenrimnong leg. ( ZMKU) ; • 1 male subimago, Lop Buri Prov., Huai Som , 14°51'52.3"N, 100°51'28.1"E, 19. I. 2025, A. Wongyam leg. ( ZMKU) ; • 25 nymphs, 5 male subimagos, 2 female subimagos, 28 male imagos, 6 female imagos, Chachoengsao Prov., Sao Cha-Ngok , 13°41'43.1"N, 101°09'13.5"E, 8. XI. 2024, B. Boonsoong leg. ( ZMKU) ; • 2 nymphs, 2 male imagos, 6 female imagos, Nakhon Nayok Prov., Wang Takrai , 14°20'09.3"N, 101°18'22.1"E, 8. III. 2025, B. Boonsoong leg. ( ZMKU) ; • 4 nymphs, Khon Kaen Prov., Sithan Lake KKU , 16°26'41.1"N, 102°48'55.0"E, 1. IV. 2024, N. Tungpairojwong leg. ( KKU) ; • 17 nymphs, Khon Kaen Prov., Fisheries Pond KKU , 16°27'31.5"N, 102°48'38.3"E, 1. IV. 2024, N. Tungpairojwong leg. ( KKU) ; • 1 nymph, Ubon Ratchathani Prov., Ubon Ratchathani University , 15°07'06.1"N, 104°54'09.4"E, 22. VIII. 2025, B. Boonsoong leg. ( ZMKU) ; • 2 nymphs, 4 male imagos, 4 female imagos, Chiang Mai Prov., Mae Jam , 18°29'47.8"N, 98°21'38.3"E, 15. XII. 2024, B. Boonsoong leg. ( ZMKU) ; • 1 male imago, 7 female imagos, Chiang Mai Prov., San Phak Wan , 18°42'54.3"N, 98°56'59.1"E, 7. I. 2025, C. Suttinun leg. ( ZMKU) ; • 13 nymphs, 9 male imagos, 4 female imagos, Ratchaburi Prov., Bua Resort Suanphueng , 13°31'30.0"N, 99°14'40.3"E, 15. III. 2025, C. Noenrimnong leg. ( ZMKU) ; • 4 nymphs, 1 female imago, Phetchaburi Prov., Centara Life Cha-Am Beach Resort , 12°44'03.3"N, 99°57'52.3"E, 3. VII. 2025, B. Boonsoong leg. ( ZMKU) ; • 5 nymphs, Trang Prov., Tham Khao Chang Hai , 7°35'08.5"N, 99°39'54.2"E, 11. IV. 2025, P. Numuan leg. ( ZMKU) .

Description

(in alcohol). Male imago (Fig. 6 D ). See Kimmins (1947) for original description.

The male imagos of this species can be identified by their transparent wings (Fig. 11 B ), with distinct dark brown to black pigmentation in the pterostigma area and pale brown markings along the costal and subcostal regions. The abdominal terga are translucent white, with prominent reddish-brown markings on segments II, III and VI; segment VII has paler patterns, and segments VIII – IX are reddish brown (Fig. 14 B ). The abdominal sterna of segments VIII – IX and the posterior portion of segment VII are white, marked with reddish-brown striped patterns (Figs 16 B , 22 B ). The compound eyes are yellowish-brown with olive-green lower portions (Fig. 9 B ).

Female imago (Fig. 6 C ). See Kimmins (1947) for original description. The female imagos can be distinguished by a cream-white head, bordered apically with a rust-coloured margin (Fig. 22 A ). The thorax is cream-white, bearing a pair of midline dark brown stripes narrowing anteriorly and flanked by white lines (Fig. 22 A ). The abdominal terga are cream-white, with prominent reddish-brown markings on segments II, III, and VI, and posterior parts of terga I – IX bearing a pair of reddish-brown stripes (Fig. 15 A ). The abdominal sterna exhibit two reddish-brown longitudinal stripes along the abdomen that fuse apically (Fig. 16 A ). The wings are hyaline, with clearly pigmented dark brown to black markings in the pterostigma area, and pale brown markings in the costal and subcostal regions (Fig. 11 A ).

Nymph. See Mukherjee et al. (2012) for first description and Ying et al. (2021). The mature nymphs resemble the imago in colouration. The head shows a similar pattern (Fig. 3 A ), and abdominal terga bear reddish-brown markings on segments II, III, and VI, consistent with the adult stage (Figs 3 A, B ). The abdominal sterna display two reddish-brown longitudinal stripes that merge on segments VIII – IX (Fig. 3 C ).

Egg. Width 59.82 μm; height 96.78 μm; granules ranging from 0.085 –0.101 μm. Oval-shaped; surface covered with granules of consistent size and distribution, high density (Fig. 22 C, D ).

Distribution.

Northern Thailand ( Chiang Mai province); northeastern Thailand ( Khon Kaen and Ubon Ratchathani provinces); central Thailand ( Bangkok, Lop Buri, and Nakhon Nayok, provinces); eastern Thailand ( Chachoengsao province); western ( Ratchaburi and Phetchaburi provinces); southern Thailand ( Trang province).

Remarks.

The adults of Cloeon harveyi were described by Kimmins (1947) based on materials from Bengal ( India). This species is also recorded from China (south, Hong Kong), Malaysia, and Thailand. The nymph was described by Mukherjee et al. (2012) and Ying et al. (2021). In this study, we provide the first description of the egg structure of C. harveyi .

Figures

Figure 3. Cloeon harveyi, mature nymph morphology: A. Female mature nymph (dorsal view); B. Terga I – X; C. Sterna I – X.

Figure 6. Live habitus of imago of Cloeon species in Thailand: A. Female of Cloeon bengalense; B. Male of Cloeon bengalense; C. Female of Cloeon harveyi; D. Male of Cloeon harveyi.

Figure 9. Adult habitus of Cloeon species in Thailand: A. Female of Cloeon harveyi; B. Male of Cloeon harveyi; C. Female of Cloeon rubellum; D. Male of Cloeon rubellum.

Figure 11. Wings of Cloeon species in Thailand: A. Female of Cloeon harveyi; B. Male of Cloeon harveyi; C. Female of Cloeon rubellum; D. Male of Cloeon rubellum.

Figure 14. Adult abdominal terga of Cloeon species in Thailand: A. Female of Cloeon harveyi; B. Male of Cloeon harveyi; C. Female of Cloeon rubellum; D. Male of Cloeon rubellum.

Figure 15. Adult abdominal sterna of Cloeon species in Thailand: A. Female of Cloeon bengalense; B. Male of Cloeon bengalense; C. Female of Cloeon bicolor; D. Male of Cloeon bicolor.

Figure 16. Adult abdominal sterna of Cloeon species in Thailand: A. Female of Cloeon harveyi; B. Male of Cloeon harveyi; C. Female of Cloeon rubellum; D. Male of Cloeon rubellum.

Figure 22. Cloeon harveyi, Adult morphology: A. Head and thorax of female imago (dorsal view); B. Sterna VIII – X of male imago (ventral view), SEMs of egg structures: C. General outline of egg; D. Chorion surface.

Figure 27. Drawing showing the dorsal (left) and ventral (right) views of a mature nymph Cloeon species in Thailand: A. Cloeon harveyi; B. Cloeon rubellum; C. Cloeon bengalense; D. Cloeon bicolor; E. Cloeon viridulum.

Figure 28. Drawing showing the dorsal (left) and ventral (right) views of a female imago of Cloeon species in Thailand: A. Cloeon rubellum; B. Cloeon harveyi; C. Cloeon bicolor; D. Cloeon viridulum; E. Cloeon bengalense.

Figure 29. Drawing showing the dorsal (left) and ventral (right) views of a male adult of Cloeon species in Thailand: A. Cloeon harveyi (imago); B. Cloeon viridulum (subimago); C. Cloeon bicolor (imago); D. Cloeon bengalense (imago); E. Cloeon rubellum (imago).