Amiota (Amiota) watabei, On, 2001

Chen, Hong-Wei & Toda, Masanori J., 2001, A revision of the Asian and European species in the subgenus Amiota Loew (Diptera, Drosophilidae) and the establishment of species-groups based on phylogenetic analysis, Journal of Natural History 35 (10), pp. 1517-1563 : 1545-1546

Amiota (Amiota) watabei sp. nov.

(figure 13)

Diagnosis. Surstylus with large, densely pubescent ap on outer mesal surface figure 13B); aedeagus about one-half as long as paramere (figure 13D).

Description. Male: Wing with 22–23 minute, peg-like spinules on ventral surface costal vein between R and R.

2 +3 4 +5

Legs: Mid tarsus with a row of minute cuneiform setulae on posteroventral surface. Hind femur posteroventrally with about fi ve long setae; hind tibia ventrally with about 11 setae.

Sixth abdominal tergite tapering laterally, but reaching lateral margin of fi fth tergite, broadened dorsally.

M ale terminalia: Epandrium completely separated mid-dorsally, with 13–15 setae near posterior to ventral margins (figure 13A). Surstylus not expanded at posteroventral corner, with about fi ve short prensisetae on distal margin, a few thin setulae on outer ap, and several on ventrapical part of inner surface (figure 13B). Tenth sternite nearly bilobed, but not separated mid-dorsally, laterally narrowly fused to surstyli; lateral lobe-like process somewhat oblong (figure 13B). Anterior portion of hypandrium entirely thin (figure 13C). Parameres separated from each other, lobeshaped, slightly incised at posterolateral corner, each with apical, sclerotized process and six to seven sensilla on distal mesal surface (figure 13D). Aedeagus separated into a pair of somewhat sinuated rods, each fused to base of paramere (figure 13D). Vertical lobe of gonopod spade-shaped, strongly protruded and sclerotized apically figure 13C). Ejaculatory apodeme: apical plate with four pits per side; stalk thick, long (figure 13F).

M easurements: BL =2.84 mm; ThL =1.23 mm; WL =2.25 mm; WW =1.13 mm.

Indices: arb =4 / 3, avd =0.50, adf =1.30, w =1.50, F W / H W =0.36, ch / o =0.13, prorb =0.98, rcorb =0.73, vb =0.40, dcl =0.55, presctl =0.57, sctl =0.98, sterno = 0.97, orbito =1.54, dcp =0.32, sctlp =1.02, C =1.94, 4 c =1.88, 4 v =3.35, 5 x =1.17, =4.57, M =0.82, C3F =0.69. H ol ot ype:, China: Shennongjia, H ubei, 1520 m, 26 July 1992, around human eyes, H. Watabe leg. (D BSC) .

Distribution. China (H ubei).

R elationship. This species resembles A. lanceolata in many characters, for example the shapes of paramere, aedeagus, and vertical lobe of gonopod, but can be clearly distinguished from it by the rudimentary, unsclerotized process at the posterolateral corner of the paramere, the number of prensisetae on the surstylus (six to seven in lanceolata ) in addition to the diagnostic characters.

Etymology. Patronym, in honour of Prof. H. Watabe of Hokkaido University of Educa tion.