Xylophion sevrapek Villemant, 2012

Villemant, Claire, Yoshida, Takuma & Quiles, Adrien, 2012, A new species of Xylophion Gauld, 1979 (Insecta, Hymenoptera, Ichneumonidae) from Vanuatu, Zoosystema 34 (2), pp. 253-259 : 255-257

publication ID	https://doi.org/ 10.5252/z2012n2a3
persistent identifier	https://treatment.plazi.org/id/03CB87A7-FFD4-FFC5-94E2-858C70E2FA96
treatment provided by	Felipe
scientific name	Xylophion sevrapek Villemant
status	sp. nov.

Treatment

Xylophion sevrapek Villemant n. sp.

TYPE MATERIAL. — Vanuatu. SANTO 2006, île de Santo, Penaoru 1200 m, 14°58’2.35”S, 166°40’43.4”E, 18-30. XI.2006, piège Malaise, montane forest, rec. C. Villemant MG 12A2, ♀ holotype ( MNHN EY6344).

Paratypes: same data as holotype, ♀ ( MNHN EY6342).— SANTO 2006, Vanuatu, île de Santo, Penaoru 900 m, 14°58’0.17”S, 166°39’21.69”E, 18-30.IX.2006, piège Malaise, montane forest, rec. C. Villemant MG 09A2, ♀ ( MNHN EY2039), ♂ ( MNHN EY6343).

ETYMOLOGY. — The specific epithet is a noun in apposition and refers to “Sevrapek City” the name given by the Penaoru villagers to the base camp of the “Forests, Mountains, Rivers” theme of the SANTO 2006 expedition, from the eponymous river ( Tzérikiantz 2008).

DIAGNOSIS. — Xylophion sevrapek Villemant n. sp. is a brownish red species easily distinguished from the other described Xylophion species by its dorsally angled occipital carina ( Fig. 1C View FIG ) with the ventral extremities becoming obsolescent far from the hypostomal carina ( Fig. 1D View FIG ). Xylophion xylus is a smaller (forewing: 6-11 mm) yellow orange species with 49-59 flagellomeres while X. ketus is larger (forewing: 10-13 mm), more reddish orange, and has very long antennae with 70-72 flagellomeres ( Gauld 1977). Male tarsal claws of X. sevrapek Villemant n. sp. have a shape similar to that of X. xylus , while in X. ketus the inner and outer rows of teeth of the claw extend laterally, so that there is a central overlap between the two parallel ends of the rows ( Gauld 1984). The third Xylophion species recognised by Gauld (1984) is a male from Tasmania ( Xylophion sp. BNHM) considered by this author as the sister-species of X. xylus ; in this species there is only a central gap in the pectination of male claws.

DESCRIPTION

Female ( Fig. 1A View FIG )

Body length 11.4 mm (11.1, 13.3), forewing 9.2 mm (9.6, 11.4), ovipositor 1.1 mm (1.0, 1.2).

Head. Transverse, distinctly constricted behind eyes, with occipital width about 2× diameter of median ocellus ( Fig. 1B View FIG ); ocelli large, close to eyes, posterior ocelli separated from each other by 0.4× their own maximum diameter and from nearest eye by 0.1× this diameter; occipital carina angled dorsally ( Fig. 1C View FIG ), its ventral extremities becoming obsolescent far from hypostomal carina ( Fig. 1D View FIG ); gena short, weakly rounded posteriorly, maximum breath of eye in profile about 3× breath of gena in same line; frons and vertex impunctate; face slightly larger than high, convex medially, shining and sparsely hairy, moderately and shallowly punctate centrally; clypeus about 2× as broad as high, moderately convex, its apical margin impressed and truncate; malar space about 0.5× basal width of mandible; mandible of moderate length, weakly tapered apically, with two sub-equal teeth. Antenna very long and slender with 54 (54, 56) flagellomeres. First flagellomere about 6×, second 4×, third 3× and twentieth 2× as long as wide.

Mesosoma. Pronotum alutaceous; mesopleuron polished with sparse minute punctation; mesoscutum in profile abruptly rounded, with anterior margin slightly out-turned; notauli absent; mesoscutum shining and covered with rather dense short hair, centrally with minute punctures separated by about 2-3× their diameter; scutellum subtriangular, moderately convex with sparse minute punctures and rather long hair; propodeum in profile abruptly declivous, with anterior carina more or less complete, lateral carinae of area superomedia partly distinct centrally. Fore tibial spur with a vestigial membranous flange at base behind macrotrichial comb; inner mid tibial spur 1.3× as long as outer one; hind trochantelli dorsally as long as broad; outer hind tarsal claw with 8-9 long stout pectinae; inner mid tibial spur 1.4× outer spur. Forewing with cu-a slightly basad to Rs & M; Rs slightly sinuous; second discal cell uniformely hirsute with hairs separated by about their length; first subdiscal cell with scattered hairs, sub-basal cell almost hair-

less. Alar indices (mean values, three specimens): WA1 = 3.8; WB1 = 2.8; WC1 = 0.6; WSD1 = 1.2; WIC1 = 0.3; WN2 = 1.3.

Metasoma elongate; segment 1 with posterior margin of sternite posterior to inter-spiracular line by 3.6× interspiracular distance; tergite 2 in profile 3.7× as long as deep, when viewed dorsally with a slight constriction at base. Tergite 1 smooth, following tergites covered with fine rather dense adpressed pilosity.

Colour. body entirely dark brownish-red with fine silver pubescence on mesosoma. Antenna, fore and mid tibia and tarsi slightly paler. Ocellar triangle black.

Male ( Fig. 1E View FIG )

Body length 9.8 mm, forewing 8.6 mm.

Similar to female. Posterior ocelli separated from each other by 0.6× their own maximum diameter and from nearest eye by 0.2× this diameter. Antenna with 51 flagellomeres.

Tarsal claws with inner and outer marginal rows of teeth extended laterally without a central overlap between the two parallel ends of the rows. The distal portion of the claw is flattened and the pectinal inner row of teeth forms a “fence” around the distal end of the claw ( Fig. 2A View FIG ).

Alar indices: WA1 = 4.0; WB1 = 3.0; WC1 = 0.5; WD1 = 1.3; WIC1 = 0.3; WN2 = 1.4.

Barcode

Two barcode sequences have been obtained, from the holotype (MNHN EY6344: Bold no. ICH- SA002-12) and the male paratype (MNHN EY6343: Bold no. ICHSA001-12).

The barcode of the holotype is as follows: A AT T T TATAT T T TAT T T T TG G A ATAT GATCAGGAATATTAGGATCATCACTAAG TATTTTAATTCGAATAGAATTAGGAAACC CAGGATTTCTAATTAATAATGATCAAATT TATAATTCTATTATTACCTCTCATGCTTT TAT TATA AT T T TC T T TATA G T TATA C CAATTATAATTGGAGGATTTGGAAACT GAATAATTCCATTAATATTAGGAGCACCA GATATAGCTTTCCCTCGCATAAATAACAT AAGATTCTGACTTCTTCCCCCCTCAAT TAATTTATTAATTATAAGTAATATAAT TAATCAAGGTGTAGGAACTGGATGAA CAGTATATCCTCCTCTTTCATTGAATT TAAATCATGAAGGTATAGCATTAGATATAG CAATTTTTTCTTTACATATAGCAGGAT TATCTTCAATTATAGGAGCAATCAATTT TATTACAACAATTATAAATATAAAAAATT TAAACACAAATTTAGAAAAATTAACTT TATTTAGATGATCAATTTTAATCACTA CAATTTTATTACTATTAGCAGTCCCAGTAC TAGCTGGGGCTATTACTATACTTTTAACT GATCGTAATTTAAATACAACTTTTTTTGAC CCTTGTGGAGGAGGGGATCCAATTTTATAT CAACATTTATTT.