Bactrocera (Bactrocera) allodistincta Leblanc & Doorenweerd, 2021

Leblanc, Luc, Tsatsia, Francis & Doorenweerd, Camiel, 2021, Novel lures and COI sequences reveal cryptic new species of Bactrocera fruit flies in the Solomon Islands (Diptera, Tephritidae, Dacini), ZooKeys 1057, pp. 49-103 : 49

Bactrocera (Bactrocera) allodistincta Leblanc & Doorenweerd sp. nov.

Fig. 3A-E

Type material.

Holotype. Solomon Islands • ♂; Guadalcanal, forest; -9.4067, 159.8647; 167 m; 4-16 Apr. 2018; L. Leblanc, F. Tsatsia leg.; cue-lure baited trap FFSo015. Deposited in UHIM. Paratypes. 11 males. Solomon Islands • 1 ♂; Guadalcanal forest; -9.4041, 159.8628; 153 m; 4-16 Apr. 2018; L. Leblanc, F. Tsatsia leg.; cue-lure baited trap FFSo011 • 1 ♂; same locality and date as for preceding; -9.4067, 159.8647; 167 m; trap FFSo015 • 1 ♂; same locality and date as for preceding; -9.4072, 159.8664; 153 m; trap FFSo016 • 2 ♂; same locality and date as for preceding; -9.4064, 159.8671; 145 m; trap FFSo018; molecular voucher UHIM.ms08766 • 2 ♂; same locality and date as for preceding; -9.4059, 159.8672; 133 m; trap FFSo019 • 1 ♂; same locality and date as for preceding; -9.4055, 159.8665; 145 m; trap FFSo020 • 1 ♂; same locality and date as for preceding; -9.4040, 159.8652; 125 m; trap FFSo023 • 1 ♂; same locality and date as for preceding; -9.4026, 159.8695; 57 m; trap FFSo027 • 1 ♂; same locality and date as for preceding; -9.4000, 159.8700; 57 m; trap FFSo029. Seven of the paratypes are deposited at UHIM, three at WFBM, and one at USNM.

Differential diagnosis.

Bactrocera allodistincta differs from B. pseudodistincta (Drew) (Fig. 4 ) in the presence of orange-brown lateral and posterior markings on the predominantly black scutum, abdominal tergites III-V with a narrower medial black stripe, the lateral black markings on tergite IV narrowed posteriorly, and the rather diffuse fuscous crossband on the wing. It differs from B. distincta (Malloch) in that the costal band is diffuse orange-brown and the crossband is sinuous, with a bend along vein M (Fig. 3E ), whereas the entire costal band, including in the basicostal and costal cells, is dark fuscous and the crossband is broad and straight in B. distincta (Fig. 5E ).

Molecular diagnosis.

We obtained a single COI sequence (UHIM.ms08766) which matches closest to Bactrocera pedestris (Bezzi) [misidentified as B. gombokensis Drew & Hancock, 1994 in Doorenweerd et al. 2020], at 10.25% pairwise distance. Bactrocera pseudodistincta (Drew) [N = 2] is also represented in the dataset and does not appear as a close match, but B. distincta is not represented.

Description of adult.

Male. Head (Fig. 3A ). Height 1.56 ± 0.12 (SD) (1.37-1.67) mm. Frons of even width, 0.80 ± 0.03 (0.73-0.83) mm long and 1.40 ± 1.05 (1.33-1.50) times as long as broad; fulvous, sometimes fuscous around orbital seta and anteromedial hump; latter covered by short red-brown microtrichia; three pairs of dark fuscous frontal setae present; lunule fulvous. Ocellar triangle black. Vertex fulvous with two pairs of dark fuscous vertical setae. Face fulvous with a pair of moderately sized oval black spots in antennal furrows; length 0.49 ± 0.05 (0.43-0.60) mm. Gena fulvous, with a fuscous subocular spot and a dark fuscous seta. Occiput fulvous with a dark fuscous to black dorsomedial marking; a row of 4-6 dark fuscous postocular setae present behind eye. Antenna with scape and pedicel fulvous and first flagellomere fulvous with pale fuscous on lateral surface of flagellum; a strong red-brown dorsal seta on pedicel; arista fulvous basally and black distally; length of segments: 0.22 ± 0.04 (0.17-0.27) mm; 0.27 ± 0.03 (0.23-0.33) mm; 0.71 ± 0.04 (0.67-0.73) mm.

Thorax (Fig. 3B ). Scutum black except orange-brown ventral to and narrowly medial to lateral postsutural vitta, around notopleural suture, along lateral margin between postpronotal lobe and notopleuron, medial to postpronotal lobe, and along posterior margin of scutum. Scutum with two broad parallel medial stripes of dense silvery microtrichia along entire scutum length. Pleural areas black except orange-brown anterior margin of anepisternum and proeipsternum. Yellow markings: postpronotal lobe; notopleuron; moderately broad paired parallel-sided lateral postsutural vitta reaching intra-alar seta posteriorly; broad anepisternal stripe with anterior margin straight, reaching to anterior notopleural seta dorsally; a large transverse spot on katepisternum below the anepisternal stripe; anterior 4⁄5 of anatergite and ¾ of katatergite (posteriorly black). Mediotergite black. Scutellum yellow except for very narrow black basal band. Setae: 1 pair scutellar; 1 pair prescutellar acrostichal; 1 pair intra-alar; 1 pair postalar; 1 pair postsutural supra-alar; 1 pair anepisternal; 2 pairs notopleural; 2 pairs scapular; all setae well developed and dark fuscous.

Legs (Fig. 3F ). All legs entirely fulvous with apical 2⁄5 of hind tibia fuscous. Fore femur with a row of long pale dorsal setae. Mid-tibia with apical black spur.

Wing (Fig. 3E ). Length 5.6 ± 0.2 (5.3-5.9) mm; basal costal and costal cells fuscous with microtrichia in posterodistal corner of costal cell; broad fuscous costal band confluent with R4+5, remaining broad at apex and ending at apex of medial vein; a diffuse orange-brown crossband along crossvein r-m, continuing along M and dm-cu to reach posterior wing margin, and a broad fuscous anal streak over cell bcu and basal margin of cu1; remainder of wing light fuscous; dense aggregation of microtrichia around A1 + CuA2; supernumerary lobe weakly developed.

Abdomen (Fig. 3C, D ). Oval with tergites not fused; pecten present on tergite III; posterior lobe of surstylus short; abdominal sternite V with a deep concavity on posterior margin. Base of syntergite I+II wider than long. Syntergite I+II orange-brown with base black and a narrow sub-basal transverse medial black band. Tergites III-V orange-brown with moderately broad medial black stripe reaching apex, and large lateral black markings on tergite III and anterolateral corners of tergites IV and V. Ceromata on tergite V indistinct from abdomen orange-brown color. Sternite I dark fuscous, sternite II fulvous, and sternites III-V fulvous tending fuscous medially.

Female. Unknown

Male attractant.

Cue-lure.

Etymology.

The specific name is a noun in apposition, derived from the Greek allos (another) and the species resembles B. distincta (Malloch). Previously, B. pseudodistincta (Drew) had been described as a species with similar appearance to B. distincta . All three are present in Oceania.

Notes.

Bactrocera allodistincta was included as B. spnSol01 in Doorenweerd et al. (2020).

Figures

Figure 3. Bactrocera allodistincta sp. nov. A head B head and scutum C abdomen D male genitalia E wing F lateral view.

Figure 4. Bactrocera pseudodistincta (Drew) A head B head and scutum C abdomen D wing E lateral view.

Figure 5. Bactrocera distincta (Malloch) A head B head and scutum C female abdomen D male abdomen E wing F lateral view.