Limbodessus leysi Watts & Humphreys, 2006

Michat, Mariano C., Alarie, Yves & Watts, Chris H. S., 2012, 3584, Zootaxa 3584 (1), pp. 1-110 : 50-54

Limbodessus leysi Watts & Humphreys, 2006

( Figs 89 –106)

Source of material. One specimen of instar I and three of instar III were used for the description ( Table 1). Larvae were collected in association with adults at the following localities: Australia, Carey palaeovalley, Mt Morgan calcrete, Mt Weld Station, PB 1, BES 11816, 28.73439S, 122.14942E, 30–IX–2004, coll. W. F. Humphreys and S. J. B. Cooper ; Mt Morgan calcrete, Mt Weld Station, PB 4, BES 10581, 28.72177S, 122.1569E, 30–IX–2004, coll. W. F. Humphreys and S. J. B. Cooper.

Diagnosis (instar III). Medium-sized species (HL 0.55–1.15 mm); head (Fig. 103) subpentagonal; nasale subtriangular; half-circle of dense spinulae on lateroventral margins of nasale present; hole-like structure on ventrodistal surface of nasale absent; lateral margins of nasale inflated in dorsal view; lateral branches of nasale minute; slender spinulae anterior to seta FR13 scarce (20 or less); occipital foramen well developed (HW/OCW less than 1.90); occipital suture present; lateral margins of parietal straight; secondary spiniform setae on lateral margins of parietal scarce; seta AN2 present; distal half of MN broad; setae LA3, LA4, LA5 and LA8 hair-like; secondary setae on U absent (Fig. 106).

Instar I ( Figs 89 –102). Head ( Figs 89–97 ). Cephalic capsule strongly elongate (HL/HW more than 1.55); seta PA3 inserted far from setae PA1 and PA2; A3 more than 2.80 times longer than A1; A3 more than 2.25 times longer than A2; MP2 1.55–1.85 times longer than MP1; MP2 1.95–2.65 times longer than MP3; LP2 1.40–2.00 times longer than LP1. Legs (Figs 98–99). L3 less than 2.85 times longer than HW. Abdomen (Figs 100–102). U more than 3.75 times longer than LAS; U more than 2.45 times longer than HW; U1 1.10–1.40 times longer than U2. Chaetotaxy. Frontoclypeus with 12 lamellae clypeales; additional setae on U absent. Measurements and ratios that characterize the body shape are shown in Table 2.

Instar II. Not available.

Instar III (Figs 103–106). Head (Fig. 103). A3 less than 2.25 times longer than A1; A3 less than 1.45 times longer than A2; MN less than 4.85 times longer than broad; MP less than 1.75 times longer than labial palpus; MP2 2.10–3.10 times longer than MP3; LP2 more than 0.65 times as long as LP1. Legs (Figs 104–105). L3 2.25–2.85 times longer than HW. Abdomen (Fig. 106). U 2.40–3.10 times longer than LAS; U 1.55–2.25 times longer than HW; U1 0.70–1.40 times as long as U2. Chaetotaxy. Anteroventral margin of nasale with 48 lamellae clypeales distributed in 2 rows; pro- and mesoCO without anterior secondary setae; pro-, meso- and metaCO without posterior secondary setae; proCO with less than 11 secondary setae; metaCO with less than 20 secondary setae; anterodorsal secondary setae on pro- and metaFE present; metaFE with less than 12 anteroventral secondary setae; posterodorsal secondary setae on meso- and metaFE absent; metaFE with 9–27 secondary setae; anterodorsal secondary setae on proTI absent; anteroventral and posterodorsal secondary setae on proTI present; mesoTI with less than 4 anteroventral secondary setae; metaTI with less than 9 anteroventral secondary setae; metaTI with less posterodorsal secondary setae on meso- and metaTA present; proTA with 1–7 secondary setae; mesoTA with less than 7 secondary setae; metaTA with less than 16 secondary setae; secondary setae on U absent. Measurements and ratios that characterize the body shape are shown in Table 10. Secondary leg setation detailed in Table 18.

Remarks. Limbodessus leysi belongs to the group of species characterized by the absence of secondary setae on the urogomphus ( L. challaensis , L. exilis , L. fridaywellensis , L. hillviewensis , L. hinkleri , L. masonensis , L. millbilliensis , L. morgani , L. ordinarius , L. pulpa , L. raeae , L. windarraensis , L. yuinmeryensis ) (Fig. 106). Compared to other members of this group, the larvae of L. leysi can readily be distinguished by the following combinations of characters: lateral margins of the nasale inflated in dorsal view, bearing a half-circle of dense spinulae ( Figs 90 , 103), and primary seta AN2 present.

Figures

FIGURES 89–97. Limbodessus leysi, first-instar larva. 89, cephalic capsule, dorsal aspect; 90, cephalic capsule, ventral aspect;