phaulactis's Identifications

♂ found floating on a pool, collected, 10.v.2019. Body length about 10 mm (10.2 mm). HEAD: Head black. Temples moderately constricted behind the eyes, 0.9 times as long as the width of an eye; tangential lines on eyes and temples intersect on the scutellum or the propodeum (fig. 14). Genal carina slightly raised ventrally, joining the slightly raised oral carina at an acute angle behind the base of the mandible (figs 9a & 9b). Malar space index 0.4. Eye strongly indented next to antennal socket (figs. 2 & 4). Frons slightly depressed above the antennal carinae. Frons with a rather fine median longitudinal carina (fig. 4). Antennal carina slightly raised and not conspicuously modified dorsally (fig. 3). Antenna with 51 flagellar segments (measured on both antenna). Clypeus (figs. 1 & 2) weakly separated from face, at most about 2x as wide as deep, uniformly convex, lacking a median swelling or thin edge; not produced into a point; with conspicuous silvery or brownish setae. Mandibles broad, predominantly yellow. Labrum inconspicuous, a short part exposed below clypeus. Maxillary palps not extending to the mid coxae. Ocellar index (ratio of the shortest distance between the eye and the hind ocellus to the longest diameter of the hind ocellus): 1.1 (fig. 5). MESOSOMA: Black. Mesoscutum (fig. 14) punctuated. Mesopleurum (figs. 7 & 8) finely coriaceous and with distinct punctation anteriorly. Depression in front of the speculum dorsally with wrinkles, medially and ventrally with fine longitudinal striae, which merge with the punctation anteriorly. Ventral part of the prepectal carina (figs. 10 & 11) merging with the pleural part, both of equal height at the junction, the pleural part upwards becomes indistinct, transversely wrinkled for most of its length. Transverse carina obliterated or absent. Posterior transverse carina of the mesosternum complete. Spiracular carina distinct (fig. 7). Propodeum (fig. 13) with the anterior boundary of the area superomedia (two carina at an angle) and the posterior longitudinal carinae (less well defined medially) present. Sulcus shallowly and broadly depressed, with irregular transverse striae. Propodeal spiracle (fig. 12) elongate. WINGS: Fore wing vein 2m-cu present, with one bulla; vein cu-a much closer to Cu. Areolet large, stalked, receiving 2m-cu near the middle. Pterostigma narrow. Hind wing with vein M+Cu fully sclerotized, weakly curved; vein rs-m shorter than Rs. Hind wing nervellar index 0.8. LEGS: Hind tibia with a common insertion of the two spurs and socket. Tarsal claws pectinate. Fore tibia yellow from the apex of the coxa onwards. Mid leg (fig. 18): mid coxa black; mid femur black basally; rest of the leg yellow except the apical tarsi, brown. Hind leg: hind femur black except the basal end and a subapical spot, reddish; hind tibia (fig. 19) yellow except the both ends, brown; hind tarsi brown. METASOMA: Metasoma (fig. 15) strongly compressed laterally. Petiole (fig. 1) narrow basally and widened apically; tergite and sternite with a suture; suture indistinct or obsolescent on the basal third, subventral or below the mid-height of the segment. Petiole at the basal third somewhat trapezoidal in section. Sclerotized part of sternite 1 extending to the posterior third of the segment. Spiracle of tergite 1 behind the middle of the tergite. Glymma small, at the anterior edge of a narrow lateral area. 2nd tergite less than twice as long as wide, about 1.6x; finely and sparsely punctuate. Gaster (fig. 16) black but laterally red from the apical third of the 2nd to the basal half of the 3rd. REMARKS: Determination to family following Broad 2015; to genus following Townes 1970; species approach following Horstmann 2009 and Horstmann 2004. No species fitted with the characters studied.

Femella ofegada a una bassa. Amida 13 mm (=260/20 mm). Coloració general groga i negra. CAP: Antena amb 48 flagel·lòmers. Flagel negre, marró mig distalment. Mandíbules bidentades. Ulls emarginats interiorment. Carena occipital absent. Amplada de la templa=19/40 mm i amplada de l'ull=23/40 mm. Templa 0,82 vegades més llarga que l'amplada d'un ull. Front lleugerament deprimit per sobre de les fosses de les antenes. Carina genal aixecada a la part ventral a prop de la unió amb la també aixecada carena oral, formant una piràmide triangular tombada, la punta de la qual queda desplaçada cap per avall i es situa més o menys darrere de la base de la mandíbula. Carina genal clarament elevada. MESOSOMA: Negre. Espiracle del propodeu allargat. Propodeu excepcionalment llarg, amb algunes carenes (costulae). Carena postpectal completa. Sternaulus absent. Part ventral de la carina prepectal fusionant-se amb la carina transversal, ambdues carines sovint clarament elevades. POTES: Tarsòmers de la pota mitjana engruixits i amb ungles pectinades. Tarsos posteriors prims també amb 5 ungles pectinades bastant llargues. Tíbia anterior amb 1 esperó. Tíbies mitjanes amb esperons desiguals. Tíbia posterior amb esperons subiguals, amb una inserció comuna. Tarsos posteriors no engruixits. Fèmur posterior negre. Tíbia posterior grogosa (un xic enfosquida en taronja als extrems, menys del 0.1x des de la punta). Pota mitjana groga a partir del 0,8 distal del fèmur en endavant; segments apicals dels tarsos marrons. ALES. Ala anterior: Areoleta present, curtament peciolada. Vena 2m-cu present, amb una bulla. Ala posterior amb M+Cu ben esclerotitzada. METASOMA: Pecíol llarg, de secció basal subquadrada, amb esternit esclerificat al 0.9 basals i espiracle situat al terç apical. Algunes depressions longitudinals somes presents al pecíol. Segona tergita més de dos cops més llarga que ampla. Gàster comprimit lateralment a l'àpex. Segona tergita gastral groga dorsalment al 0.3 posterior; també les tergites 3 i 4 totalment grogues i la cinquena només a la part anterior (tergites 1, part de la 2, part de la 5, i 6 i 7 negres). OVISCAPTE: Ovipositor no molt llarg (43/40 mm), més curt que l'alçada apical del gàster (=73/40 mm). Ovopositor amb una osca dorsal. COMENTARI: Determinació seguint Broad 2015 fins a nivell de subfamília, Townes 1969 (modificat per Ribes) fins a nivell de gènere i Horstmann 2009 per l’espècie. Tal com reconeix Klaus Horstmann, al sud d'Europa les femelles poden fer fins a 12 mm. En tot cas descartem pogués tractar-se de D. lamellator, de mida més escaient (11-13 mm), però de fèmur mig completament groc. També presenta un petit inflament al front, solcat al mig, com es troba a D. splenditor, però l'índex genal és molt diferent així com el color dels extrems de la tíbia posterior.

Female drowned in a pond. Body length 13 mm (= 260/20 mm). Body colour yellow and black. HEAD: Antenna with 48 flagellar segments. Flagellum mid-brown distally. Mandibles bidentate. Inner margin of eye strongly indented opposite antennal socket. Occipital carina absent. Temple width = 19/40 mm and eye width = 23/40 mm. Temple 0.82 times as long as the width of an eye. Frons slightly depressed above the antennal sockets. Genal carina and oral carina both strongly raised ventrally, forming a high lopsided triangular pyramid, the tip of the latter shifted ventrally and situated behind the base of the mandible. Genal carina distinctly raised. MESOSOMA: Black. Propodeal spiracle elongate. Propodeum exceptionally long, with some ridges (costulae). Postpectal carina complete. Sternaulus absent. Ventral part of the prepectal carina merging with the transverse carina, both carinae often distinctly raised. LEGS: Mid tarsi thickened, claws with pectinate teeth. Hind tarsi thin, claws with five rather long pectinate teeth. Fore tibia with 1 spur. Mid tibia with unequal spurs. Hind tibia with subequal spurs, with a common insertion. Hind tarsi not thickened. Hind femur black. Hind tibiae yellowish (slightly darkened in orange at the ends, less than 0.1x from the tips). Mid leg yellow from the distal 0.8 of the femur onwards; apical segments of tarsi brown. WINGS: Forewing: Areolet present, shortly petiolated. 2m-cu vein present, with one bulla. Hind wing with well-sclerotized M + Cu. METASOMA: Petiole long, with subquadrate basal section, with sclerotized part of 1st sternite extending to the 0.9 of the segment. Spiracle located at the posterior third of the tergite. Petiole with some shallow glymmae depressions. 2nd gastral tergite more than twice as long as wide. Gaster compressed laterally at posterior end. 2nd gastral tergite dorsally yellow on the posterior 0.3; also tergites 3, 4 completely yellow and 5 only in the anterior part (black coloured are tergites: T1, anterior T2, posterior T5, T6 and T7). OVIPOSITOR : Ovipositor not very long (43/40 mm), shorter than the apical height of the gaster (= 73/40 mm). Ovipositor with a dorsal notch. REMARKS: Determination following Broad 2015 to subfamily level, Townes 1969 (modified by Ribes) to genus level, and Horstmann 2009 key to Western Palaearctic Dusona to species. As Klaus Horstmann writes, in southern Europe females can be up to 12 mm. In any case we rule out it could be D. lamellator, of smaller size (11-13 mm), but with mid femur completely yellow. It also has a small bulge on the frons, furrowed in the middle, as found in D. splenditor, but the genital index is very different as is the colour of the apex of the hind tibia.