Baetiella macani ( Müller-Liebenau, 1985 ), Muller-Liebenau, 1985

Shi, Weifang & Tong, Xiaoli, 2015, Taxonomic notes on the genus Baetiella Uéno from China, with the descriptions of three new species (Ephemeroptera: Baetidae), Zootaxa 4012 (3), pp. 553-569 : 557-558

Baetiella macani ( Müller-Liebenau, 1985) bona species

( Figs 46–47, 49 )

Neobaetiella macani: Müller-Liebenau, 1985: 108 ; Baetiella bispinosa: Waltz & McCafferty, 1987: 563

Diagnosis. Thoracic dorsum with distinct tubercles ( Fig. 47 ). Posterior margin of metanotum and abdominal terga I–II each with a single posteromedian protuberance, terga III–IX each with a pair of protuberances, the distance between bases of protuberances on tergum III much less than the length of protuberance ( Fig. 46 ). Hind wing pads vestigial. All legs with a single finger-like white coxal gill ( Fig. 49 ); claw with two rows of denticles, outer row with 8–9 acute denticles increasing in length apically, inner row with 4–5 short and blunt denticles medially, subequal in length. Gills present on terga I–VI only ( Fig. 46 ). Median caudal filament reduced to one segment, cerci slightly longer than the body length.

Material examined (deposited in ethanol unless otherwise stated). CHINA. Henan: 3 nymphs, Ruyang County, Baishu Town, Xincun (34.13°N, 112.41°E, alt. 320m), 17.xi.2006, leg. Binfeng Li; 3 nymphs, Xixia County, Xiping Town, Qi River (34.42°N, 111.08°E, alt. 370m), 22.xi.2006, leg. Xiaoli Tong; Hubei: 5 nymphs, Yichang, Yiling District, Tangjiahe, 4.v.2004, leg. Bin Zhang; 1 nymph, Xingshan County, Nanyang Town, Zhaojun Hydropower Plant, 9.v.2007, leg. Bin Zhang; Hunan: 5 nymphs, Dong’an County, Wujiaqiao Town, Wujiaqiao River (26.63°N, 111.45°E, alt. 140m), 27.i.2002, and 58 nymphs, same locality but collected on 16.iv.2003, leg. Wenli Wang; Zhejiang: 4 nymphs, Jinhua, Caozhai Town, Dafo Temple, 10.ii.2002, and 1 nymph, same locality but collected on 2.xi.2002, leg. Xiaoli Tong; Fujian: 9 nymphs, Jianyang, Masha Town, 3.ii.2002, leg. Zhiwei Li; Guangdong: 1 nymph, Yangshan County, Chengjia Nature Reserve, 13.vii.1996, leg. Xiaoli Tong; 1 nymph, Shaoguan, Nanling National Nature Reserve, Shikengwei, 26.iii.2003, leg. Wenli Wang; 1 nymph, Huizhou, Nankunshan Nature Reserve, 26.v.2003, leg. Xiaoli Tong; 1 nymph, Xinyi, Dawuling Nature Reserve, 26.v.2004, leg. Sanbao Tang; 1 nymph, Zengcheng, Paitan Town, Datang, 14.xii.2007, leg. Bin Zhang; 1 nymph, Yingde, Shimentai Nature Reserve, Hengshitang (24.43°N, 113.31°E), 7.iv.2011, leg. Weifang Shi; 1 nymph, Wengyuan County, Tieshitang (24.48°N, 113.82°E), 21.v.2011, leg. Weifang Shi; 6 nymphs, Xinyi, Tianmashan Scenic (22.46°N, 110.70°E), 11.vi.2011, leg. Weifang Shi; 1 nymph on slides and 19 nymphs in ethanol, Lechang County, Jiufeng Town (25.34°N, 113.38°E), 2.viii.2011, leg. Huimin Zhong; 7 nymphs, Shixing County, Luoba Town, Luobahe River (24.85°N, 114.22°E), 16.iii.2012, leg. Weifang Shi; 4 nymphs, Conghua, Bishuiwan (23.70°N, 113.72°E, alt. 60m), 18.x.2013, leg. Zhaohong Wang.

Distribution. China (Henan, Hubei, Hunan, Zhejiang, Fujian, Guangdong, Taiwan), Vietnam.

Comments. This species was originally established by Müller-Liebenau (1985) as Neobaetiella macani Müller-Liebenau based on nymphs collected in Taiwan. Later, Waltz & McCafferty (1987) synonymized Neobaetiella with Baetiella and considered N. macani as a junior synonym of B. bispinosa ( Gose, 1980) without any comments. This species shares morphological affinity with B. bispinosa (Gose) as both species has a single posteromedial dorsal protuberance on abdominal terga I–II, and paired protuberances on terga III–IX, as well as some unusual characteristics within the genus, i.e. the presence of single finger-like coxal gill and tarsal claw with two rows of denticles. However, the gills are only present on terga I–VI and cerci are slightly longer than body length in this species, whereas in B. bispinosa (Gose) , gills are present on terga I–VII and the cerci exceed 1.5 times the body length; furthermore, the length of dorsal protuberance on tergum III is much longer than the distance between the protuberances and the protuberance are obtuse apically, whereas in B. bispinosa , the length of dorsal protuberance on tergum III is shorter than the distance between the protuberances and the protuberance are slightly acute apically. Fujitani (2006) also mentioned B. bispinosa with 7 pairs of gills and B. macani only with 6 pairs and suspected that they are not conspecific (personal communication with Fujitani). We thus consider this species as a bona species, namely, Baetiella macani ( Müller-Liebenau, 1985) which is removed from the synonymy with B. bispinosa ( Gose, 1980) and reinstalled as a valid species.

Figures

FIGURES 45 – 54. Baetiella spp. from China. (45) B. bispinosa (Gose); (46 – 47) dorsal and lateral view of B. macani (Muller- Liebenau); (48) B. marginata Braasch; (49) coxal gills of B. macani (Muller-Liebenau); (50) thoracic sterna of B. spathae n. sp.; (51) thoracic sterna of B. tuberculata (Kazlauskas); (52) head and thorax of B. marginata Braasch; (53) B. trispinata Tong & Dudgeon; (54) B. tuberculata (Kazlauskas).