Bactrocera (Bactrocera) ramuensis, Drew & Ma & Smith & Hughes, 2011

Drew, R. A. I., Ma, Jing, Smith, S. & Hughes, J. M., 2011, The Taxonomy And Phylogenetic Relationships Of Species In The Bactrocera Musae Complex Of Fruit Flies (Diptera: Tephritidae: Dacinae) In Papua New Guinea, Raffles Bulletin of Zoology 59 (2), pp. 145-162 : 153-154

Bactrocera (Bactrocera) ramuensis , new species

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Material examined. – Holotype male, Papua New Guinea: Madang Province, Ramu Sugar Residental Area , 1 Sep.1999, attracted to cue lure, (trap P411).

Paratypes. – 1 male (4 Aug.1999), 1 male (10 Nov.1999), 1 male (18 Aug.1999), same locality data as holotype ; 1 male, Madang Province, Bogia Station , 14 Jan.1999 , cue lure, (trap P416); 1 male, Madang Province, Brahman High School , 20 Aug.1999 , cue lure, (trap P412); 1 male, Morobe Province, Forest Res. Inst., Lae Botanical Garden , 18 Jan.1999 , L. Leblanc et al. cue lure, (trap P402); 1 male, Morobe Province, Markham Farming , 4 May 1999 , S. Sar, S. Balagawi , cue lure, (trap P410) .

Location of Types. – Holotype ( T. 152255) in QM; 2 paratypes in ANIC; 2 paratypes in BMNH; 3 paratypes in QDPI.

Diagnosis. – A medium sized species; face fulvous with a pair of small oval fuscous spots; postpronotal lobe and notopleuron yellow; scutum black, tending fuscous to dark fuscous centrally; two lateral postsutural vittae present; medial postsutural vitta absent; mesopleural stripe reaching midway between anterior margin of notopleuron and anterior npl. seta dorsally; scutellum yellow; wings with a narrow fuscous costal band slightly overlapping R 2+3, moderately broad fuscous cubital streak present, cells bc and c colourless, microtrichia in outer corner of cell c only; abdominal terga III–V orange-brown with large fuscous to dark fuscous areas along anterior margin of tergum III which expand around lateral margins of this tergum, pale fuscous to fuscous on anterolateral corners of terga IV and V.

Description. – Male.

Head. – Vertical length 1.47 mm. Frons length 1.42 times breadth; fulvous with fuscous around orbital setae and pale fuscous on anteromedial hump; latter with a small number of short pale hairs; orbital setae black: 1 s.or.; 2, i.or.; lunule fulvous. Ocellar triangle black. Vertex fuscous. Face fulvous with a pair of small oval fuscous spots; length 0.49 mm. Genae fulvous, fuscous subocular spot; red-brown seta present. Occiput red-brown, fulvous along eye margins; occipital row with 3–7 dark setae. Antennae with segments 1 and 2 fulvous, segment 3 fulvous with fuscous on apex and outer surface; length of segments: 0.15 mm, 0.3 mm, 0.75 mm.

Thorax. – Scutum black, tending dark fuscous centrally and with red-brown below lateral postsutural vitta and dark red-brown around mesonotal suture, between notopleura and postpronotal lobe and inside postpronotal lobe. Pleural area fuscous to dark fuscous except red-brown below postpronotal lobe. Yellow markings as follows: postpronotal lobe; notopleuron; mesopleural stripe of medium width, reaching midway between anterior margin of notopleuron and anterior npl. seta dorsally, continuing to katepisternum as a transverse spot, anterior margin slightly convex; anatergite (posterior apex black); anterior ¾ katatergite (remainder dark fuscous); two broad parallel sided lateral postsutural vittae ending behind ia. setae. Postnotum dark fuscous tending dark red-brown centrally. Scutellum yellow except for a narrow black basal band. Setae: sc. 2; prsc. 2; ia. 1; p.sa. 1; a.sa. 1; mpl. 1; npl. 2; scp. 4.

Legs. – All segments fulvous except hind tibiae pale fuscous; mid tibiae each with an apical black spur.

Wings. – Length 5.4 mm; cells bc and c colourless; microtrichia in outer corner of cell c only; remainder of wings colourless except fuscous cell sc, narrow fuscous costal band slightly overlapping R 2+3 where it is slightly paler and diffuse and ending between extremities of R 4+5 and m, broad fuscous cubital streak; dense aggregation of microtrichia around A 1 +CuA 2; supernumerary lobe of medium development.

Abdomen. – Oval; terga free; pecten present on tergum III. Tergum I and sterna I and II wider than long. Tergum I fuscous except for a narrow fulvous band along posterior margin which does not reach lateral margins; tergum II redbrown except for large fulvous areas posterolaterally and a narrow transverse fuscous band anteriorly but not reaching dark fuscous anterolateral margins; terga III–V orange-brown except for large fuscous to dark fuscous areas laterally on tergum III which usually join along anterior margin of this tergum and pale fuscous to fuscous anterolateral corners on terga IV and V. In some specimens there is a narrow diffuse pale fuscous to fuscous medial longitudinal line on tergum III and anteriorly on tergum IV. A pair of oval orange-brown shining spots on tergum V. Posterior lobe of surstylus short, sternum V with a deep concavity on posterior margin.

Attractant. – Cue lure.

Distribution. – Morobe and Madang Provinces, Papua New Guinea.

Hosts. – No known record.

Etymology. – The name ramuensis is with reference to the type locality, ‘Ramu’ in the Madang province, Papua New Guinea.

Remarks. – Bactrocera ramuensis new species is similar to B. finitima , B. musae and B. tinomiscii in possessing lateral postsutural vittae that end at or behind ia. seta, colourless cells bc and c and an oval shaped abdomen. It differs from B. finitima and B. musae in having the costal band barely overlapping R 2+3 (only as a pale, diffuse tint when it does), from all these species in having each parallel sided lateral postsutural vitta ending behind ia. seta and from B. tinomiscii in having dark colour patterns on terga III, IV and V, particularly laterally.

Figures

Fig. 3. Bactrocera (Bactrocera) ramuensis, new species.