中国四节蜉属一新种(蜉蝣目:四节蜉科)

A NEW SPECIES OF THE GENUS BAETIS FROM CHINA (EPHEMEROPTERA:BAETIDAE)

报道了采自江苏省南京紫金山麓四节蜉属一新种逸仙四节蜉 Ｂａｅｔｉｓ ｙｉｘｉａｎｉ ｓｐ ． ｎｏｖ ． （ 成虫、稚虫） ， 该新种稚虫近似于 Ｂ． ｌａｅｔｉｆｉｃｕｓ ， 主要区别为前者腹部第１ ～７ 节有７ 对鳃， 而后者腹部第２ ～７ 节只有６ 对鳃。

The present paper deals with a new species, Baetis yixiani sp.nov.(imago, nymph), which was collected from Mt. Zijin, Nanjing. The new species is allied to B.laetificus Müller, but distinguishable from the latter by the number of gills. B.yixiani has 7 pairs of gill in abdomen 1～7; B.laetificus has 6 pairs of gill in abdomen 2～7. Types are deposited in the Department of Biology, Nanjing Normal University. Baetis yixiani sp.nov. Male imago(in alcohol):Body length 6 5 mm. fore wing 5 8 mm, caudal filaments 10 5 mm. General color of head purple red. Compound eyes with upper portion purple red and lower portion dark reddish purple; ocelli colorless. Thorax dark reddish purple. Legs light yellow, fore leg, tarsus shorter than tibia, the length of tarsal arrangement is 1,2,3,4;hind leg tarsus longer than tibia, the length of tarsal arrangement is 1,4,2,3. Claws asymmetrical,one blunt and another acute. Fore wing having a couple of marginal veins, hind wing very small with three longitudinal veins, costal projection acute.Abdomanal (1～6 terga light purple,slight transparent,with two unparallel white stripes in central,which approach each other at anterior. and 7～10 terga with two parallel white stripes. Genital forceps 3 segmented. Mature nymph(in alcohol):Body length 6 5 mm, caudal filaments 5 mm. Base of incisor in right mandible with lepto villi, tabial palpus slight long, auricle small, anterior part of paraglossa broad, dorsal part of anterior margin of glossa with thick villi, hind wing well developed. Femora flat, with a series of sparse setae on outer lateral portion and a series of long spine on inner lateral part of the tarsal. Inner lateral margin of claw with a row of sharp dentes. 7 pairs of gill in abdomen 1～7. Holotype ♂imago, allotype ♀imago, paratype 3♂♂ imagos, 9♀♀ imagos, 7♂♂ mature nymphs. Mt. Zijin, Nanjing, May 3, 1992, coll. by Lu Liang.