Pseudalomya truncaticornis Chen & Kikuchi, 2024

Chen, Hsuan-Pu, Kikuchi, Namiki & Shiao, Shiuh-Feng, 2024, Discovery of a new Pseudalomya Telenga, 1930 (Hymenoptera, Ichneumonidae, Ichneumoninae) species from Taiwan and its implications for the systematic position of this genus, Journal of Hymenoptera Research 97, pp. 277-296 : 277

publication ID	https://dx.doi.org/10.3897/jhr.97.119470
publication LSID	lsid:zoobank.org:pub:4C51A1B9-275F-448E-B940-3D544E25B1FE
persistent identifier	https://treatment.plazi.org/id/5C674A42-79DA-410C-A52C-25191684E0F6
taxon LSID	lsid:zoobank.org:act:5C674A42-79DA-410C-A52C-25191684E0F6
treatment provided by	Journal of Hymenoptera Research by Pensoft
scientific name	Pseudalomya truncaticornis Chen & Kikuchi
status	sp. nov.

Treatment

Pseudalomya truncaticornis Chen & Kikuchi sp. nov.

Figs 1 View Figure 1 , 2 View Figure 2 , 3 View Figure 3 , 4 View Figure 4

Diagnosis.

This species can be distinguished from other congeners in having the following combination of characters: frontal horn short and apically truncated; face sparsely punctate; metasomal tergites smooth with sparse and minute punctures; forewing with 1cu-a distad to M&RS; head reddish brown; mesosoma and legs black; and metasomal tergites metallic-blue.

Material examined.

Holotype. Taiwan • 1♀; Miaoli County, Tai’an Township, Shei-Pa National Park, Mt. Huoshi ; 24°22'47.78"N, 121°10'53.67"E (DMS); alt. 3160 m; 25 Aug. 2021 - 12 May. 2022; Jung-Chang Chen, Kuang-Yao Chen, Li-Jen Chang, Ta-Hsiang Li and Hung-Yang Shen leg.; Malaise Trap; GenBank: PP175350 (COI), PP188485 (28S), PP188484 (18S); Sample ID: SP0060; Voucher: NMNS ENT 8836-1. GoogleMaps

Paratypes. Taiwan • 2♀; ibid; GenBank: PP175351 (COI, SP0061), PP175352 (COI, SP0062); Sample ID: SP0061-SP0062; Voucher: NARO (SP0061); NMNS ENT 8836-2 (SP0062) .

Description.

Female. Head: 1.43-1.75 (1.75) × as wide as deep; antenna with 26-27 (27) flagellomeres; first flagellomere 1.13-1.22 (1.13) × as long as wide and 1.04-1.12 (1.04) × as long as second one; second flagellomere 1.08-1.19 (1.08) × as long as wide, remaining flagellomeres about 1.0 × as long as wide; frons strongly and transversely striated; horn laterally depressed, apically truncated or slightly rounded (Figs 2A View Figure 2 , 4A View Figure 4 ); face polished, 2.16-2.43 (2.16) × as wide as long, sparsely punctate (distance between punctures 2.0-3.0 × average puncture diameter) in middle and relatively dense (distance 1.0-2.0 × average puncture diameter) laterally (Figs 2B View Figure 2 , 4C View Figure 4 ), with setae; eyes bare, frontal orbit elevated; clypeus polished, 2.25-2.88 (2.88) × as wide as long, sparsely punctate with long setae, rounded in ventral margin and flat in lateral view (Figs 2A, B View Figure 2 , 4C, F View Figure 4 ); malar space 1.29-1.73 (1.73) × as basal width of mandible, smooth in dorsal half and densely coriaceous in ventral half (Figs 2A, B View Figure 2 , 4C View Figure 4 ); mandible unidentate, rounded apically, broad, flat, polished and punctate with long setae at base (Fig. 4C View Figure 4 ); gena polished and sparsely punctate (Fig. 2C View Figure 2 ), pointed and strongly narrowed ventrally, meeting under the foramen; ocellar area and vertex rugose, rugose-punctate laterally; POL/OD=1.20-1.50 (1.50), OOL/OD=2.20-2.54 (2.36) (Figs 2A View Figure 2 , 4E View Figure 4 ); occiput smooth; occipital carina strong and complete, genal carina meeting hypostomal carina far from mandible base at ventral tip of genae in 1.40-1.73 (1.73) × of basal width of mandible.

Mesosoma: polished; pronotum with setae, transversely and strongly strigose dorsally, evenly and coarsely punctate dorsolaterally, and rugose-punctate ventrolaterally (Figs 2E View Figure 2 , 3A View Figure 3 ); epomia present; propleuron coarsely punctate with setae; mesoscutum flat, 1.15-1.21 (1.21) × as long as wide, with median lobe densely and coarsely punctate, lateral lobes evenly punctate but polished and sparsely punctate posteriorly, with setae (Fig. 2E View Figure 2 ); notauli present anteriorly; scutellum flat, 1.09-1.18 (1.18) × as long as wide, sparsely punctate with setae, lateral carina absent (Fig. 2E View Figure 2 ); mesopleuron punctate, but rugose in dorso-anterior corner and middle posterior 0.5-0.8 (0.5), with mesopleural sulcus and furrow crenulate (Fig. 3A View Figure 3 ); epicnemial carina complete, extend to whole height of mesopleuron; sternaulus present in anterior 0.4 of mesopleuron; mesepisternum smooth; metapleuron evenly and coarsely punctate with setae in upper division and dorsal half, strongly and transversely strigose in ventral half; propodeal spiracle oval, 1.43-1.57 (1.43) × as long as wide; posterior transverse carina of mesosternum interrupted anterior to mid-coxa; propodeum evenly and coarsely punctate with setae, with area basalis smooth, area superomedia and area petiolaris rugose-punctate, and area postero-externa rugose-foveolate (Fig. 2F View Figure 2 ); juxtacoxal carina present in basal 0.6; pleural and submetapleural carina present basally; lateromedian longitudinal carina weak; lateral longitudinal carina, anterior transverse carina, and propodeal apophysis absent; posterior transverse carina present, but weak medially.

Legs: evenly punctate with setae; coxa smooth dorso-apically; fore femur 2.63-2.84 (2.74) × as long as wide; hind femur 3.23-3.34 (3.34) × as long as wide, 0.21-0.24 (0.21) × as long as hind tibia; hind first tarsomere 1.75-1.92 (1.92) × as long as second tarsomere, and 0.45-0.49 (0.45) × as long as hind tibia; tibial spurs 2; tarsal claws normal.

Wings: forewings narrowed, 3.80-4.22 (4.12) × as long as wide, and length 8.01-8.45 (8.45) mm (Fig. 3B View Figure 3 ); forewing 1cu-a postfurcal, distad M & RS 0.23-0.33 (0.33) × by its length; areolet pentagonal, truncate anteriorly, with 2rs-m 1.10-1.26 (1.16) × as long as 3rs-m, and 1/M 1.05-1.14 × as long as 2/M; 2 m-cu with two bulla; hindwing hamuli 7-9 (9), NI = 3.52-4.29 (4.29), CU and AA after cu-a weak.

Metasoma: polished; T1 2.00-2.68 (2.01) × as long as its apical width, smooth, postpetiole sparsely and minutely punctate (Fig. 2G View Figure 2 ); spiracles of T1 located at about 0.7 of length of tergite (Fig. 3A View Figure 3 ); T2 0.91-0.95 (0.91) × as long as its apical width, with gastrocoeli and thyridium absent (Fig. 2G View Figure 2 ); T3 0.63-0.72 (0.63) × as long as its apical width; tergites after T1 smooth with sparse and minute puncture (Fig. 2G View Figure 2 ); pS1 and S2 separated by weak crease (Fig. 3C View Figure 3 ); laterosternites strongly sclerotized in S1-5, separately from median sternites by crease; median sternites strongly sclerotized, with weakly sclerotized median area in S2-4 and separated by creases; sclerites of S2 0.5 × as long as S2, not touched its posterior margin, with two weakly sclerotized spots; median sternites of S5 and S6 complete; metasomal apex amblypygous (Fig. 1A View Figure 1 ), with apical margin of hypopygium pointed (Fig. 3C View Figure 3 ); ovipositor sheath 0.16-0.20 (0.17) × as long as hind tibia, smooth with setae; ovipositor with upper valve slightly longer than lower valve, and lower valve with fine teeth.

Coloration: head mainly reddish brown, except central area of frons, horn, orbits, ventral margin of gena and clypeus, face below antennal sockets and around tentorial pits, ocellar area, apical half of mandible, occiput except its dorsal margin, and occipital carina black (Fig. 2A-C View Figure 2 ); antenna mainly black except flagellomeres 8 (or 9)-13 ivory and ventral surface of scape reddish brown (Fig. 1A, B View Figure 1 ); mesosoma mainly black, except two stripes at dorsal surface of pronotum, posterior corner of pronotum, and postspiracular sclerite before tegula reddish brown (Figs 1A, B View Figure 1 , 2E View Figure 2 , 3A View Figure 3 ); metasomal tergites metallic dark blue (Fig. 2G View Figure 2 ), with sternites black tinged with reddish brown; ovipositor sheaths black and ovipositor reddish brown; legs mainly black except apical fore femur, ventral side of fore tibia, basal and apical basitarsus, apical tarsomeres reddish brown (Fig. 1A View Figure 1 ); wings tinged with infuscate, with veins and pterostigma black (Fig. 3B View Figure 3 ). One specimen (NMNS ENT 8836-2; SP0062) with temple above eyes, whole occiput, and all legs black (Fig. 4E, F View Figure 4 ).

Male. Unknown.

Etymology.

The specific name " Pseudalomya truncaticornis " is derived from the Latin " truncati -" (meaning “maimed” or "having appendages cut off") plus " cornis " (meaning “horned”). It refers to the truncated apex of the horn on the frons in this species. Name is an adjective.

Distribution.

Taiwan.

Bionomics.

Host and phenology unknown. The specimens were collected from Taiwan Hemlock ( Tsuga chinensis ) ( Pinaceae ) forest in the high-altitude area (alt. 3160 m) of central Taiwan, with Yushania niitakayamensis ( Bambusoideae , Poaceae ), Rhododendron species ( Ericaceae ), and moss as ground-cover plants (Fig. 5 View Figure 5 ).

Remarks.

Comparisons of the photos of holotypes and descriptions of congener species revealed the highest level of similarity between P. truncaticornis sp. nov. and P. nepalensis Riedel, 2019. However, unlike P. nepalensis , the new species had the black coloration in mesosoma and legs (reddish brown in P. nepalensis ), the middle of face with sparse punctures with distance between punctures 2.0-3.0 × their diameter (dense in P. nepalensis , distance less than 1.0 × their diameter), and a short and apically truncated frontal horn (long and apically rounded in P. nepalensis ). While variation in the color of the head was observed within P. truncaticornis sp. nov., given the disjunct geographical distributions between P. truncaticornis sp. nov. and P. nepalensis (Taiwan and the Himalaya, respectively) and the presence of morphological differences beyond mere coloration, P. truncaticornis sp. nov. is considered a distinct species. To the best of our knowledge, this is the first record of Pseudalomya in Taiwan.