Baeus spirolimbus, Stevens

Stevens, Nicholas B. & Austin, Andrew D., 2007, Systematics, distribution and biology of the Australian ' micro-flea' wasps, Baeus spp. (Hymenoptera: Scelionidae): parasitoids of spider eggs, Zootaxa 1499, pp. 1-45: 37-38

publication ID 10.5281/zenodo.177085

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Baeus spirolimbus, Stevens

sp. nov.

17. Baeus spirolimbus, Stevens   , sp. nov.

( Figs 13 View FIGURE 13 C & D, 17 A)

Holotype, Ψ, Queensland, 'Maroochy Hort Res Stn, Nambour, S.E. QLD, 22.iii – 3.iv. 1985. Malaise Trap' ( ANIC).

Paratypes: Queensland: 2 Ψ, Casey Ck via Imbil, 30.xii. 1974 – 27.iii.1975, – 23.viii. 1975, G.B. & S.R. Monteith ( QDPC); 1 Ψ, Black Butt Range, Benarkin, 10.i – 28.iii. 1975, G.B. & S.R. Monteith ( QDPC); 2 Ψ, Laceys Ck, Mission Beach, 17.54 S 146.06 E, 13–14.v. 1980, I.D. Naumann & J.C. Cardale ( ANIC); 1 Ψ, Windsor Tableland via Mt Carbine, 22.ix – 16.x. 1983, Storey & Titmarsh ( WINC); 2 Ψ, Davies Ck Rd, 16 km up via Mareeba, 4–13.iii.1983, 18 km up, 18.i – 2.ii. 1985, Storey & Titmarsh ( QDPC); 2 Ψ, State Forest nr Caloundra turn-off, 8.iii. 1984, I.D. Galloway ( QDPC); 2 Ψ, Kuranda, 6 km NW, 2.x – 6.xi. 1984 ( QDPC); 7 Ψ, Kuranda, 6 km SW, 10.xii. 1984 – 15.i. 1985, Storey & Halfpapp ( QDPC); 1 Ψ, same data as holotype ( ANIC); 1 Ψ, 'Maroochy Hort Res Stn, Nambour, 22.iii – 3.iv. 1985. Malaise Trap ( ANIC); 1 Ψ, Julatten, 20–29.x. 1987, A. Walford-Huggins ( WINC); 5 Ψ, Lake Eacham, 17.17 S 145.39 E, 15.ii – 2.iii.1988, 2– 16.iii.1988, 16– 29.iii. 1988, D. Rentz ( ANIC); 19 Ψ, Bald Hill, McIlwraith Ra., 13.43 S 143.19 E, – 12.vii. 1989, I. Naumann ( ANIC); 17 Ψ, Batavia Downs, 12.41 S 142.41 E, 23.viii – 16 ix. 1992, P. Zborowski & L. Miller ( ANIC); 14 Ψ, Heathlands Research Reserve, 11.45 S 142.35 E, 25.vii – 18.viii. 1992, P. Zborowski & J. Cardale, 18.ix – 21.x. 1992, P. Zborowski & T. Weir, 5.iv – 23.v. 1993, P. Zborowski & A. Roach, 23.v – 1993, P. Zborowski & I. Naumann ( ANIC).

Description. Female. Mean length 0.82 mm (0.76–0.88; n = 5); body and head brown, legs and antennae yellow, both with darker markings on dorsal surfaces.

Head 2.63 (2.33–2.80) x as wide as inter-ocular distance, and 1.71 (1.52–1.83) x as wide as long; medial ocellus 15 μm in diameter, 106 (90–120) μm from posterior head margin; lateral ocelli touching eye margin, 24 (20–30) μm from posterior head margin; posterior ocellar line 1.38 (1.27–1.47) x inter-ocular distance; vertex coriarious, pilosity mostly dense, may have patches of moderate density, length generally of medium length, although some rows can exhibit short setae towards the anterior regions of the vertex; eyes large and ovoid, eye height 0.58 (0.56–0.61), eye width 0.58 (0.50–0.61) x length, pilosity short; frontal carina prominent, reaching 0.56 (0.50–0.67) distance to medial ocellus; lateral cristulations of malar region reaching to within 10 μm of eye margin; in postero-lateral view, anterior and posterior genal margins parallel medially; anterior genal margin in contact with 0.51 of ventral eye margin length; posterior eye margin touching hyperoccipital carina.

Mesosoma. Length 0.63 (0.61–0.64) x width; mesoscutum and mesoscutellum coriarious, pilosity mostly of moderate density, and of medium length but can be long in parts; propodeum glabrous medio-dorsally; mesoscutum length 0.43 (0.42–0.44) x width, 0.63 (0.61–0.65) x mesosoma length and 2.44 (2.20–2.80) x mesoscutellum length; mesoscutellum 2.33 (1.67–2.50) x as long as propodeum; sculpturing of dorsal mesopleuron scrobiculate, sculpturing extending ventral to level of dorsal metapleuron; sculpturing of laterodorsal propodeum around spiracle mostly smooth with few fine setae present; propodeal spiracle opening small and ovoid, situated on lateral margin of dorsal propodeum ( Fig. 13 View FIGURE 13 C), which is delineated from lateral propodeum by distinct, laterally projecting carina ( Fig. 13 View FIGURE 13 D; large arrow); distinctive quarter-circle shaped recess present below lateral carina ( Fig. 13 View FIGURE 13 D; small arrow); posterior margin of metapleuron curving dorsally, ending ventral to level of antero-lateral margin of T 2, posterior region level with anterior region of lateral propodeum, depression present in medial region of posterior metapleuron and anterior propodeum; hind femoral spine reduced.

Metasoma. T 2 length 0.87 (0.83–0.89), sculpturing coriarious; pilosity generally of moderate density medio-anteriorly, but sparse elsewhere, and mostly long in length, but can be of medium length in parts; both T 3 and T 4 smooth, non-pilose medially.

Comments. Notable features of this species are the propodeal spiracle being situated close to the lateral margin of the laterally projecting carina, and the distinctive quarter-circle shape of the recess below this lateral carina. It is confined to north eastern Australia ( Fig 17 View FIGURE 17 A). The name ' spirolimbus' is from the Latin words that relate to the closeness of the propodeal spiracle to the lateral margin of the lateral carina; spiro, meaning breathe, and limbus, meaning fringe.


Australian National Insect Collection


Queensland Primary Industries Insect Collection


Waite Insect and Nematode Collection