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

Fig. 12A-E

Type material.

Holotype. Solomon Islands • ♂; Guadalcanal, forest; -9.4064, 159.8671; 145 m; 4-16 Apr. 2018; L. Leblanc, F. Tsatsia leg.; cue-lure baited trap FFSo018; molecular voucher UHIM.ms08789. Deposited in UHIM.

Differential diagnosis.

Bactrocera quasienochra (Fig. 12 ) is similar to B. enochra (Drew) (Fig. 13 ). It differs by the absence of broad black lateral markings on abdomen tergites III-V, and the narrower lateral postsutural vitta, ending before intra-alar seta.

Molecular diagnosis.

We sequenced the holotype for COI, and its sequence is closest to an undescribed species from Malaysia ( B. spMalaysia11 in Doorenweerd et al. (2020)) at 11.19% pairwise distance. The B. quasienochra sequence has an even greater distance to those of B. enochra [N = 6].

Description of adult.

Male. Head (Fig. 12A ). Height 1.83 mm. Frons, of even width, 0.93 mm long and 1.56 times as long as broad; dark fulvous and narrowly fulvous anterolaterally; anteromedial hump 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 large oval black spots in antennal furrows; length 0.53 mm. Gena fulvous, with large dark fuscous subocular spot and a red-brown seta. Occiput fulvous and dark fulvous behind vertex; row of postocular setae weakly developed, with ca. four nearly indistinct setae. Antenna with scape and pedicel dark fulvous and flagellum fulvous with lateral surface and inner apical half dark fuscous; a strong fulvous dorsal seta on pedicel; arista fulvous basally and black distally; length of segments: 0.27 mm; 0.30 mm; 0.87 mm.

Thorax (Fig. 12B ). Scutum orange-brown with two short sublateral dark fuscous markings anterior to notopleural suture, and continued posteriorly as parallel lines formed by black microtrichia. Pleural areas orange-brown. Notopleuron light fulvous. Yellow markings: posterior half of postpronotal lobe (anteriorly orange-brown); narrow paired parallel-sided lateral postsutural vitta, slightly tapered posteriorly and ending before intra-alar seta; moderately broad anepisternal stripe with anterior margin straight, reaching to mid distance between anterior and posterior notopleural setae dorsally; anterior ⅔ anatergite and katatergite (posteriorly orange-brown). Mediotergite orange-brown. Scutellum orange-brown, and yellow on anterolateral surface and ventrally. Setae: 1 pair scutellar; prescutellar acrostichal absent; 1 pair intra-alar; 1 pair postalar; 1 pair postsutural supra-alar; 1 pair anepisternal; 2 pairs notopleural; 1 pair scapular (lateral position); all setae well developed and fuscous.

Legs (Fig. 12F ). Legs entirely fulvous with hind tibia tending fuscous on dorsal surface. Fore femur with a row of long fulvous dorsal setae. Mid-tibia with an apical black spur.

Wing (Fig. 12E ). Length 6.7 mm; basal costal and costal cells fuscous with microtrichia in posterodistal corner of costal cell; narrow fuscous costal band confluent with R2+3, not expanded at apex, and ending mid distance between apex of R4+5 and medial vein, and broad fuscous anal streak; remainder of wing hyaline; dense aggregation of microtrichia around A1 + CuA2; supernumerary lobe weakly developed.

Abdomen (Fig. 12C, D ). Elongate-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. All tergites orange-brown with a medial longitudinal black stripe gradually broadened from base of tergite III and extended apically along the entire lateral margins of tergite V except their bases. Ceromata on tergite V indistinct from abdomen orange-brown color. Abdominal sternites fulvous.

Female. Unknown

Male attractant.

Cue-lure.

Etymology.

The species name is a noun in apposition, derived from the Latin adverb quasi (just as if) used in conjunction with the epithet of the species it closely resembles; B. enochra .

Notes.

Bactrocera quasienochra was included as B. spnSol03 in Doorenweerd et al. (2020).

Figures

Figure 12. Bactrocera quasienochra sp. nov. A head B head and scutum C abdomen D male genitalia E wing F lateral view.

Figure 13. Bactrocera enochra (Drew) A head B head and scutum C abdomen D wing E lateral view.