Zaprionus Zaprionus lachaisei Yassin & David, 2010

Yassin, Amir & David, Jean R., 2010, Revision of the afrotropical species of Zaprionus (Diptera, Drosophilidae), with descriptions of two new species and notes on internal reproductive structures and immature stages, ZooKeys 51, pp. 33-72 : 52-53

Zaprionus Zaprionus lachaisei Yassin & David sp. n.

Diagnosis.

This species resembles Zaprionus vittiger , but has the bigger body size (TL> 1.60 mm), spiniform spines enlarged and blackened on the first two tarsomeres of the foreleg ( Fig. 5 ), and shorter puparial anterior spiracles (H = 5) ( Fig. 11 ). It is also distinguishable by a peculiar behavior of the larvae which do not leave the culture bottle when disturbed or crowded.

Description.

♂. TL = 1.68 mm.

Head. Arista with 3 dorsal and 2 ventral rays plus a terminal fork, pedicel tan. Frons orange-tan with lateral white stripes; median white stripe absent; ocellar triangle raised and darker; hw:fw = 2.04, fw:fl = 1.05. Face pale; carina large; palpus yellow. Gena broad, o:j = 10.2, o:ch = 5.2. Orbital bristles in straight line; or2 very minute, or1:or2:or3 = 7:2:5, orbito-index = 1.4. Ocellar setae long, divergent; oc:or1 = 1.3, poc:oc = 0.5, iv:ov = 0.6. Eye red and densely pilose.

Thorax. Scutum tan, darker than frons, with four white longitudinal stripes continuing on scutellum; white stripes narrow, bordered with large black stripes, especially on the inner side; acs in 6 regular rows anterior to adc and 4 irregular rows between them; psc enlarged, adc:psc = 1.5; adc:pdc = 0.6. Scutellum slightly pointed at the apex, where white spot absent; bsc:asc = 1.3. Sterno-index = 0.6. F1 with 4 setiferous spines not borne on tubercules on the anteroventral margin. Basitarsus of the foreleg with a hairy brush on the ventral margin. Spiniform spines of the first and second tarsomeres of the foreleg enlaged and blackened.

Wing. Dusky; WL:WW = 2.3, C-index = 3.0, 4v-index = 1.5, 4c-index = 0.8, 5x-index = 0.7, M-index = 0.3, ac-index = 2.5, b/c = 0.6, C3 fringe 0.45, WL = 3.8 mm.

Abdomen. Uniformly tan, with dark spots at the bases of tergal bristles.

Terminalia ( Fig. 13a ). Epandrium densely pubescent at ventral portion; posterior margin pubescent at dorsal portion with 5 long bristles; anterior phragma narrow; epandrial ventral lobe with 3 long bristles. Surstylus quadrate with two rows of prensisetae. Cercus triangular laterally. Hypandrium with a small pubescent patch at the lateral portion of the paraphyses. Aedeagus expanded apically; aedeagal flap expanded and deeply serrate. Apodeme subequal in length to aedeagus.

♀. TL = 1.76 mm, resembling male.

Terminalia. Oviscape with 8 peg-like and 7 short, marginal setae plus 4 supernumary. Spermatheca large, globulous and smooth ( Fig. 13b ).

Egg. Elliptical with 4 equally long and fine filaments.

Larva. Not escaping the culture medium when disturbed or crowded.

Puparium. H = 5.0 ( Fig. 11d ).

Distribution

. Tanzania.

Type material

. Holotype (male) and allotype (female), Tanzania: East-Usambara Mountains, Amani (870 m), ex type strain ZMI.12, 11-VIII-2008, founder female coll. 25-IX-2002, D. Lachaise. Paratypes: 10 males and 10 females with the same label. Types deposited in MNHN.

Discussion

. Attempts to hybridize this strain with others belonging to the vittiger complex have all failed. The species is very prolific and easy to breed in the laboratory.

Etymology

. Patronym, in honor of the French Drosophila systematist Dr. Daniel Lachaise (1948-2006), collector of the types of two new species described here.

Figures

Figure 5. Tarsomeres of male foreleg of Zaprionus neglectus Collart, 1937 a, Zaprionus kololdkinae Chassagnard & Tsacas, 1987 b, Zaprionus lachaisei Yassin & David, sp. n. c, Zaprionus taronus Chassagnard & Tsacas, 1993 d, and Zaprionus santomensis Yassin & David, sp. n. e.

Figure 11. Puparium of Zaprionus neglectus Collart, 1937 a, Zaprionus inermis Collart, 1937 b, Zaprionus cercus Chassagnard & McEvey, 1992 c, Zaprionus santomensis Yassin & David, sp. n. d, Zaprionus lachaisei Yassin & David, sp. n. e and Zaprionus vittiger Coquillett, 1902 f.

Figure 13. Male genitalia and spermatheca of Zaprionus lachaisei Yassin & David, sp. n. a, b, and Zaprionus santomensis Yassin & David, sp. n. c, d.