Limbodessus yuinmeryensis ( Watts & Humphreys, 2003 )

Michat, Mariano C., Alarie, Yves & Watts, Chris H. S., 2012, 3584, Zootaxa 3584 (1), pp. 1-110 : 94-98

Limbodessus yuinmeryensis ( Watts & Humphreys, 2003)

( Figs 252 –269)

Source of material. Two specimens of instar I, two of instar II and two of instar III were used for the description ( Table 1). The larvae were collected in association with adults at the following localities: Australia, Raeside palaeovalley, Yuinmery calcrete, New Well, BES 6654, 28.54972S, 119.09111E, 15-V-2001, coll. W. F. Humphreys, C. H. S. Watts and S. J. B. Cooper ; Yuinmery calcrete, Nine mile Well, BES 8061, 28.54306S, 119.13333E, 15-V-2001, coll. W. F. Humphreys, C. H. S. Watts and S. J. B. Cooper ; Yuinmery calcrete, Youanmi Station , Ram (New) Well, BES 14372, 27.8286S, 119.3213E, 20-IX-2006, coll. W. F. Humphreys and T. Moulds ; Yuinmery calcrete, Youanmi Station , Ram (New) Well, BES 14373, 27.8286S, 119.3213E, 20-IX-2006, coll. W. F. Humphreys and T. Moulds.

Diagnosis (instar III). Medium-sized species (HL 0.55–1.15 mm); head (Fig. 266) subpentagonal; nasale subtriangular; 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 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. 269).

Instar I ( Figs 252–265 ). Head ( Figs 252–260 ). Cephalic capsule not strongly elongate (HL/HW less than 1.55); seta PA3 inserted contiguous to setae PA1 and PA2; A3 (1) 2.20–2.75 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 261–262 ). L3 less than 2.85 times longer than HW. Abdomen ( Figs 263–265 ). U more than 3.75 times longer than LAS; U more than 2.45 times longer than HW; U1 less than 1.05 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 4.

Instar II. Head. 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 2.25–2.95 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 more than 2.25 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; anterodorsal, anteroventral and posterodorsal secondary setae on proTI absent; anterodorsal secondary setae on meso- and metaTI present; meso- and metaTI with less than 2 posterodorsal secondary setae; posteroventral secondary setae on pro- and metaTI present; posteroventral secondary setae on mesoTI 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 7. Secondary leg setation detailed in Table 15.

Instar III (Figs 266–269). Head (Fig. 266). 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 267–268). L3 2.25–2.85 times longer than HW. Abdomen (Fig. 269). U more than 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 40 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 and anteroventral secondary setae on proTI present; mesoTI with less than 4 anteroventral secondary setae; metaTI with less than 9 anteroventral secondary setae; posterodorsal secondary setae on proTI absent; metaTI with less than 16 secondary setae; secondary setae on proTA absent; anterodorsal and posteroventral secondary setae on meso- and metaTA absent; anteroventral and posterodorsal secondary setae on meso- and metaTA present; 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 12. Secondary leg setation detailed in Table 20.

Remarks. Limbodessus yuinmeryensis 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. leysi , L. masonensis , L. millbilliensis , L. morgani , L. ordinarius , L. pulpa , L. raeae , L. windarraensis ) (Fig. 269). Larvae of this species can be distinguished from those of any species of that group by the following combination of characters: lateral margins of the nasale not inflated in dorsal view (Fig. 266), presence of anteroventral secondary setae on the protibia (Fig. 267), absence of anteroventral secondary setae on the protarsus (Fig. 267), and absence of posteroventral secondary setae on the tarsus (Fig. 268).

Figures

FIGURES 252–260. Limbodessus yuinmeryensis, first-instar larva. 252, cephalic capsule, dorsal aspect; 253, cephalic capsule,

FIGURES 261–265. Limbodessus yuinmeryensis, first-instar larva. 261, left metathoracic leg, anterior aspect; 262, right