Gastrozona selangorensis, Chua, 2003

Chua, T. H., 2003, New bamboo-shoot flies from Peninsular Malaysia (Diptera: Tephritidae: Ceratitidinae), Journal of Natural History 37 (4), pp. 463-472 : 468-471

Gastrozona selangorensis new species

( figures 3 , 4 )

Material examined

Malaysia: Holotype 3, Ulu Langat , Selangor, October 1995, C. S. Ooi and T. H. Chua; 1♀ paratype, same data as holotype (all BMNH).

Male. Length of body 6.1 mm, of wing 6.0 mm.

Head: ratio length: height: width, 1:1.7:2.1; fulvous. All setae black: three pairs frontal and two pairs orbital setae; orbitals on slightly raised elongated area; ocellars well developed, fine; vertical, postvertical and postocellars well developed. Occiput not swollen, with a row of black postocular setae. Genal seta golden brown; a fulvous spot below eye. Face fulvous. Antennae light brown, shorter than face; third segment dorsoapically rounded; aristae short-plumose.

Thorax: scutum fulvous to light brown in ground colour, two postsutural yellow vittae, two lateral broad blackish brown longitudinal vittae, and a medial longitudinal fulvous to light brown vitta darker medially; the lateral pair of blackish brown vittae weakly interrupted at suture but broadly connected posteriorly; a pentagonal yellow-white area between dorsocentral setae and ending at acrostichal setae; notopleural calli light brown; postpronotal lobes yellow, unspotted, continuing as a broad band covering most of anepisternum except narrow lower margin. With a full complement of black thoracic setae: four scapulars, one postpronotal, two notopleurals, one presutural supra-alar, one postsutural supra-alar, one postalar, one intra-alar, two dorsocentral, two acrostichal, two anepisternal, one anepimeral, one sternopleural and four scutellars. Acrostichal and intra-alar slightly behind postalar. Pleura mostly fulvous; anatergite and katatergite yellow, black posteriorly; mediotergite brown, fulvous medially. Notopleura brown, darker anteriorly. Scutellum yellow with narrow blackish brown basal band. Hateres fulvous.

Legs fulvous; fore femur with one dorsal and one ventral row of black setae; mid-tibia with an apical black spine.

Wing pattern banded, yellow-brown to brown; cells bc and base of c clear, whole of cell sc light brown, darker basally; costal band broad, slightly overlapping vein R, mostly brown; transverse band across R-M crossvein reaches apex of vein 2+3

Cu +A; band through DM-Cu crossvein isolated and moderate, expanded poster-

2 1

iorly; subapical band across apex of vein M isolated, ending near middle of cell m; R-M crossvein placed beyond apex of cell sc, a little beyond middle of cell dm; veins R and R setose, the latter to a little beyond line of DM-Cu crossvein. Cell bcu

1 4+5

apically acuminate.

Abdomen fulvous to orange-brown in ground colour; tergum III black except for a moderate anterior margin, tergum V with transverse blackish brown basal band, interrupted medially; terga III–V with a row of black setae laterally; tergum VI short, black.

Female. Description as for male except for the following differences.

Length of body (including oviscape) 7.7 mm, of wing 7.5 mm.

Head: ratio length: height: width, 1:1.8:2.4; brown. Genal seta black. Antennae brown.

Thorax: scutum orange-brown in ground colour; a quadrate yellow area between dorsocentral setae and ending at acrostichal setae; notopleural calli brown, darker brown ventrally. Scutellum yellow with moderate black basal band.

Legs fulvous; fore femur with two dorsal and one ventral rows of black setae; mid-tibia with apical brown band, hind tibia with apical third dark brown.

Wing: costal band broad, confluent with vein R, with a traingular hyaline

2+3 indentation at end in cell r; subapical band across apex of vein M united with

1 costal band just above vein R.

4+5

Abdomen: terga IV and V with transverse black basal bands, the latter narrowing medially; terga III–V with a row of black setae laterally; tergum VI short, with black setae and black lateral band. Oviscape dark red-brown, 1.7 mm in length, about as long as terga V–VI combined; eversible membrane setose apically third; aculeus with rounded tip, and two pairs of setae.

Host plants The specimens were attracted to slashed bamboo shoot.

Distribution Peninsular Malaysia.

Etymology

The specific name is derived from the State of Selangor, where the type locality is situated .

Remarks

This species was first mentioned as Gastrozona nr. parviseta Hardy in Chua (1999). This species resembles G. fasciventris in that the subapical band across vein M is present in both sexes and, in the female, is united with the costal band at vein R, but free from band across DM-Cu crossvein; apical ends of mid- and hind

4+5

femora are darkened.

However, the female G. selangorensis may be differentiated from G. fasciventris in that the scutellum is yellow with a narrow black basal band, the scutum has a medial yellow quadrate area just before the dorsocentrals, the oviscape is red brown. Similarly, the male G. selangorensis has a medial yellow quadrate area in the scutum just before the dorsocentrals; tergum V has two black narrow basal bands; subapical band across vein M not united with costal band.

Both sexes of G. selangorensis differ from those of G. parviseta in the subapical band across vein M, present in males and united with the costal band in females in G. selangorensis .

Figures

FIG. 3. Male Gastrozona selangorensis sp. nov.

FIG. 4. Female Gastrozona selangorensis sp. nov.