Limbodessus hinkleri (Watts & Humphreys, 2000)

Michat, Mariano C., Alarie, Yves & Watts, Chris H. S., 2012, 3584, Zootaxa 3584 (1), pp. 1-110 : 47-50

Limbodessus hinkleri (Watts & Humphreys, 2000)

(Figs 85–88)

Source of material. One specimen of instar II and one of instar III were used for the description ( Table 1). Larvae were collected in association with adults at the following localities: Australia, Carey palaeovalley, Hinkler Well

Diagnosis (instar III). Medium-sized species; head (Fig. 85) subpentagonal; nasale subtriangular; half-circle of dense spinulae on lateroventral margins of nasale present; hole-like structure on ventrodistal surface of nasale present; lateral margins of nasale inflated in dorsal view; lateral branches of nasale minute; slender spinulae anterior to seta FR13 absent; occipital foramen moderately reduced (instar II: HW/OCW 0.80–2.10); occipital suture present; lateral margins of parietal straight; secondary spiniform setae on lateral margins of parietal scarce; seta AN2 absent; distal half of MN broad; setae LA3, LA4, LA5 and LA8 hair-like; secondary setae on U absent (Fig. 88).

Instar I. Not available.

Instar II (Fig. 85). Head (Fig. 85). A3 less than 2.50 times longer than A1; A4 less than 0.70 times as long as A3; MN less than 4.70 times longer than broad; MP2 1.05–1.45 times longer than MP1; MP2 2.10–2.95 times longer than MP3; LP2 1.00–1.70 times longer than LP1. Legs. L3 less than 2.20 times longer than HW; CL(L3) less than 0.40 times as long as TA. Abdomen. U 3.00–4.00 times longer than LAS; U less than 2.15 times longer than HW; U1 less than 1.45 times longer than U2. Chaetotaxy. Anteroventral margin of nasale with 24 lamellae clypeales distributed in a single row; anterior secondary setae on proCO absent; meso- and metaCO with less than 5 posterodorsal secondary setae; ventral secondary setae on pro- and mesoCO present; proFE with less than 3 posteroventral secondary setae; metaFE with less than 11 secondary setae; secondary setae on proTI absent; anterodorsal secondary setae on mesoTI present; anterodorsal secondary setae on metaTI absent; meso- and metaTI with less than 2 posterodorsal secondary setae; posteroventral secondary setae on meso- and metaTI absent; metaTI with less than 5 secondary setae; secondary setae on proTA absent; posterodorsal secondary setae on meso- and metaTA present; posteroventral secondary setae on meso- and metaTA absent; metaTA with less than 4 secondary setae; secondary setae on U absent. Measurements and ratios that characterize the body shape are shown in Table 5. Secondary leg setation detailed in Table 13.

Instar III (Figs 86–88). Head. 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 86–87). Abdomen (Fig. 88). Chaetotaxy. Anteroventral margin of nasale with 33 lamellae clypeales distributed in 1–2 rows; proCO without anterior and posterior secondary setae; proCO with less than 11 secondary setae; anterodorsal secondary setae on proFE present; anterodorsal secondary setae on proTI present; anteroventral and posterodorsal secondary setae on proTI absent; secondary setae on proTA absent; secondary setae on U absent. Measurements and ratios that characterize the body shape are shown in Table 9. Secondary leg setation detailed in Table 17.

Remarks. This species was described on the basis of one instar II and one badly preserved instar III, of which only the mouth parts and the last abdominal segment could be measured, and only the prothoracic leg was available for chaetotaxic analysis. Limbodessus hinkleri 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. leysi , L. masonensis , L. millbilliensis , L. morgani , L. ordinarius , L. pulpa , L. raeae , L. windarraensis , L. yuinmeryensis ) (Fig. 88). Larvae of L. hinkleri are very distinctive and can easily be recognized by the following combinations of characters: lateral margins of the nasale inflated in dorsal view (Fig. 85), presence of a hole-like structure on the ventrodistal surface of the nasale (more evident in instar III), absence of slender spinulae on the ventral surface of the nasale (anterior to seta FR13), and primary seta AN2 absent. The occipital foramen is somewhat reduced.