Limbodessus macrohinkleri Watts & Humphreys, 2006

Michat, Mariano C., Alarie, Yves & Watts, Chris H. S., 2012, 3584, Zootaxa 3584 (1), pp. 1-110 : 54-56

Limbodessus macrohinkleri Watts & Humphreys, 2006

(Figs 107–110)

Source of material. One specimen of instar II was used for the description ( Table 1). The larva was collected in association with adults at the following locality: Australia, Carey palaeovalley, Hinkler Well calcrete, Lake Way Station, Dawson’s Well, BES 10493, 26.88651S, 120.16203E, 3–VI–2004, coll. W. F. Humphreys, C. H. S. Watts and C. Clay.

Diagnosis (instar II). Larger species (HL more than 1.05 mm); head (Fig. 107) pyriform; nasale digitiform; half-circle of dense spinulae on lateroventral margins of nasale absent; hole-like structure on ventrodistal surface of nasale absent; lateral margins of nasale not inflated in dorsal view; lateral branches of nasale well developed; slender spinulae anterior to seta FR13 scarce (20 or less); occipital foramen strongly reduced (HW/OCW more than 2.70); occipital suture absent; lateral margins of parietal curved; secondary spiniform setae on lateral margins of parietal numerous; seta AN2 present; distal half of MN broad; setae LA3, LA4, LA5 and LA8 hair-like; secondary setae on U present (Fig. 110).

Instar I. Not available.

Instar II (Figs 107–110). Head (Fig. 107). A3 more 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 more than 3.20 times longer than MP3; LP2 less than 0.90 times as long as LP1. Legs (Figs 108–109). L3 2.25–2.95 times longer than HW; CL(L3) less than 0.40 times as long as TA. Abdomen (Fig. 110). U more than 4.15 times longer than LAS; U less than 2.15 times longer than HW; U1 more than 1.65 times longer than U2. Chaetotaxy. Anteroventral margin of nasale with 228 lamellae clypeales distributed in 3–4 rows; anterior secondary setae on proCO present; meso- and metaCO with less than 5 posterodorsal secondary setae; ventral secondary setae on pro- and mesoCO present; proFE with more than 3 posteroventral secondary setae; metaFE with more than 11 secondary setae; anterodorsal secondary setae on pro-, meso- and metaTI absent; anteroventral and posterodorsal secondary setae on proTI present; mesoTI with more than 3 posterodorsal secondary setae; metaTI with more than 2 posterodorsal secondary setae; posteroventral secondary setae on pro-, meso- and metaTI present; metaTI with more than 5 secondary setae; anterodorsal secondary setae on proTA absent; anteroventral and posteroventral secondary setae on proTA present; posterodorsal and posteroventral secondary setae on meso- and metaTA present; metaTA with more than 5 secondary setae; secondary setae on U present. Measurements and ratios that characterize the body shape are shown in Table 5. Secondary leg setation detailed in Table 13.

Instar III. Not available.

Remarks. The absence of instar III specimens of L. macrohinkleri hampers the comparison with the other species described here, particularly regarding some chaetotaxic characters. Limbodessus macrohinkleri belongs to the group of stygobitic species characterized by the presence of secondary setae on the urogomphus ( L. barwidgeeensis , L. bigbellensis , L. cooperi , L. eberhardi , L. nambiensis , L. raesideensis , L. yandalensis ) (Fig. 110), and within this group it can be distinguished by the following combination of characters: head pyriform (Fig. 107), occipital suture absent (Fig. 107), occipital foramen strongly reduced (Fig. 107), and absence of anterodorsal secondary setae on the protibia (Fig. 108).