Psomizopelma brachypterum Gibson

Gibson, Gary A. P., 2018, The species of Psomizopelma Gibson (Hymenoptera: Eupelmidae), Zootaxa 4444 (1), pp. 73-91: 80-83

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Psomizopelma brachypterum Gibson


Psomizopelma brachypterum Gibson 

Figs 17–31View FIGURES 17–24View FIGURES 25–31

Psomizopelma brachypterum Gibson, 1995: 258  –259.

Material examined. USA. Florida. Monroe Co., Fat Deer Key, 4.III-28.IV. 1 985 (allotype ♂ CNCAbout CNC)  , 4.V- 4.VIII.1985 (1♀ PT CNC), 4.VI.1986 (1♀ PT CNCAbout CNC, CNCAbout CNC Photo 2017-20), S.&J. Peck, hammock forest, MT & FIT. Big Torch Key , SW1/4, Sec. 12, 4.III-29.IV.1985, S.&J. Peck, hammock forest, MT & FIT (1♂ PT CNCAbout CNC)  . N. Key Largo, Sec. 35, [no date] (4♂ PT CNCAbout CNC, CNCAbout CNC Photos 2017-22, 2017-23, 2017-25; 1♂ PT USNMAbout USNM)  , 1.VIII- 16.XI.1985 (1♂ PT CNC), S.&J. Peck, hammock forest, MT-FIT. No Name Key, 23.II-3.VI.1986, S.&J. Peck , hammock forest, malaise & FIT (holotype ♀ CNCAbout CNC; 1♀ PT USNMAbout USNM, CNCAbout CNC Photo 2017-21)  ; 1.VI.1986, M. Kaulbars (1♀ PT CNCAbout CNC)  .

Description. FEMALE (habitus: Figs 17, 18 View Figure ). Length about 2.6–3.1 mm. Head ( Figs 17–20 View Figure ) mostly brown to dark brown but clypeus and lower face lateral of clypeus to about level of inner or outer margin of torulus distinctly paler, more brownish-yellow ( Fig. 20 View Figure ). Labiomaxillary complex with palps dark brown ( Fig. 20 View Figure ). Antenna ( Fig. 17 View Figure ) uniformly dark brown or sometimes scape and sometimes also pedicel and basal funiculars somewhat paler, lighter brown to brownish-yellow, but with whitish setae. Mesosoma ( Figs 17, 18, 21 View Figure ) dark brown except for following: pronotal panel with ventral and posterolateral margins whitish ( Fig. 21 View Figure ), mesopectus ventrally at least anterior of mesocoxae and acropleuron posteroventrally above mesocoxa ( Fig. 21 View Figure ) obviously paler, brownish-yellow, and mesopectus sometimes more extensively pale on either side of discrimen. Legs ( Figs 17, 18 View Figure ) similarly dark as mesosoma except meso- and metafemora variably distinctly paler, more similar in color to paler parts of mesopectus and acropleuron. Gaster dark brown except Gt1–Gt3 laterally and all sternites except for hypopygium white ( Figs 18, 24 View Figure ), and ovipositor sheaths yellow ( Fig. 24 View Figure ) or at least distinctly paler, brownish-yellow apically.

Head with face ( Fig. 19 View Figure ) almost uniformly punctate-reticulate and completely setose except scrobes above toruli and often interantennal prominence mesally; eyes and face with white hairlike or at most very slender, elongate-lanceolate setae except for brownish hairlike setae on clypeus and lower face lateral of clypeus; scrobal depression comparatively shallow and small, delimiting broad parascrobal region ( Figs 19, 20 View Figure ), minimum width of parascrobal region between torulus and lower inner orbit at least as wide as torulus and about 0.5× distance between toruli; malar space about 0.33× eye height; OOL: POL: LOL: MPOD = 28: 29: 18: 10; interorbital distance about 0.5× head width. Antenna with scape comparatively slender, about 5× as long as greatest width, with ventral margin almost straight so subequal in width over most of length though slightly narrower basally; clava about at long as combined length of apical 6 funiculars.

Brachypterous ( Figs 17, 23, 24 View Figure ); fore wing about 5× as long as maximum width and extending only to about base of gaster ( Figs 17, 23 View Figure ), at most slightly beyond level of petiole; orangish-brown with dense lanceolate setae over both membrane and venation, basally and sometimes subapically the setae darker brown, but at least with more orangish setae in band near middle and apically, and sometimes more uniformly orangish over about apical half to two-thirds. Mesonotum ( Fig. 17 View Figure ) similarly punctate-reticulate as head, with dark setae; scutellum ( Fig. 23 View Figure ) conspicuously elongate-slender, at least twice as long as wide and 1.3× maximum width of scutellar-axillar complex. Prepectus bare ( Fig. 21 View Figure ). Acropleuron ( Figs 21, 22 View Figure ) isodiametric reticulate anteriorly and posteriorly, though reticulations smaller posteriorly, and with much smaller punctate-reticulate sculpture just beyond setae. Metapleuron ( Fig. 22 View Figure : pl3) bare dorsal to transverse carina delimiting setose metasternum ( Fig. 22 View Figure : st3). Front leg with femur (cf. Fig. 37 View Figure ) strongly expanded over about apical half such that ventral margin conspicuously sinuate and dorsal length at most about 3× maximum width; tibia also conspicuously compressed such that at most about 4× as long as maximum width at midlength. Hind leg ( Fig. 18 View Figure ) with coxa distinctly setose dorsobasally and ventrolongitudinally as well as across outer surface over almost apical half; femur quite obviously expanded apically, the enlarged region delimited basally by distinct notch on dorsal margin; tibia conspicuously compressed and with distinct notch near midlength so dorsal margin convex basally and apically; basitarsomere very slightly, inconspicuously compressed. Propodeum with foramen sinuately incurved to anterior margin.

Metasoma with petiole obviously transverse, lunate. Gaster dorsally ( Figs 17, 24 View Figure ) more or less uniformly meshlike reticulate; Gt1 mostly bare dorsally, but Gt2 and subsequent tergites densely setose with posteriorly directed setae, the setae dark dorsally but paler, more whitish laterally.

MALE (habitus: Figs 25, 26 View Figure ). Length about 1.8–2.3 mm. Head ( Figs 25–27 View Figure ) brown to dark brown with interantennal prominence and lower face at most slightly paler and with at most slight, obscure metallic bluish to purplish lusters. Labiomaxillary complex with palps brown. Antenna ( Fig. 28 View Figure ) entirely brown. Mesosoma ( Figs 25, 26, 30 View Figure ) entirely, similarly brown to dark brown as head except ventral margin of pronotal panel pale and mesoscutum sometimes with obscure metallic purple to bluish lusters. Legs entirely brown except basal two pro- and/or mesotarsomeres sometimes white ( Fig. 26 View Figure ). Gaster similarly brown as mesosoma ( Fig. 25 View Figure ).

Head ( Fig. 27 View Figure ) with Π-shaped scrobal depression shallowed toward but not extending to anterior ocellus, the depression often somewhat more coarsely meshlike reticulate than frontovertex; vertex with dark setae and lower face usually with paler brown setae, but eyes, interantennal prominence, parascrobal regions, and frons between scrobal depression and anterior ocellus with whitish setae. Width of parascrobal region between torulus and lower inner orbit almost 0.4× distance between toruli; malar space about 0.4–0.45× eye height; OOL: POL: LOL: MPOD = 17: 20: 11: 10; interorbital region almost 0.6× head width. Antenna ( Fig. 28 View Figure ) with length (width) ratio of scape: pedicel: funiculars: clava = 52(14): 22(9): 10(9), 11(10), 14(11), 14(12), 13(12), 11(12), 10(12), 9(12): 41(13); scape moderately compressed, of subequal width throughout; flagellum with most funiculars subquadrate.

Fore wing ( Fig. 29 View Figure ) hyaline except disc behind marginal and stigmal veins brownish to about level of medial fold; relative length of cc: mv: stv: pmv = 6.2: 3.0: 1.0: 3.0. Front leg with femur apically and tibia similarly expanded and compressed as for female. Hind leg with tibia distinctly compressed, at least over apical half, only about 6.75× as long as greatest width. Metapleuron ( Fig. 30 View Figure : pl3) with 2–5 setae dorsal to ventral carina distinguishing much smaller metasternum ( Fig. 30 View Figure : st3). Propodeum bare between spiracle and median carina ( Fig. 31 View Figure ).

Distribution. Nearctic: USA (Florida).

Remarks. No new specimens of P. brachypterum  have been discovered since its original description, but the species is now known to form a species trio along with P. fuscum  and P. metallicum  . Females of the three species share at least four distinctive features—a mostly dark brown body (e.g. Figs 17, 18 View Figure ), whether or not with evident metallic luster ( Figs 54, 61, 62 View Figure ), comparatively broad parascrobal regions in association with a relatively shallow scrobal depression (e.g. Fig. 20 View Figure ), white setae on the face and eyes (e.g. Fig. 19 View Figure ), and a conspicuously compressed profemur (apically) and protibia (e.g. Fig. 37 View Figure ). The discovery of another brachypterous species from Florida, P. metallicum  , was unexpected, but females of P. brachypterum  and P. metallicum  are differentiated by both colour and sculptural features as discussed under the latter species. Currently, P. brachypterum  is known only from the Florida Keys, whereas P. metallicum  is known only from two eastern counties near the middle of the peninsula. As discussed under P. albiclava  , males of P. brachypterum  , P. fuscum  and P. metallicum  likely are all quite similar except P. metallicum  males possibly are more distinctly metallic.


Canadian National Collection of Insects, Arachnids, and Nematodes


Smithsonian Institution, National Museum of Natural History














Psomizopelma brachypterum Gibson

Gibson, Gary A. P. 2018


Psomizopelma brachypterum

Gibson 1995: 258