Limbodessus shuckardii (Clark, 1862)

Michat, Mariano C., Alarie, Yves & Watts, Chris H. S., 2012, 3584, Zootaxa 3584 (1), pp. 1-110 : 22-24

Limbodessus shuckardii (Clark, 1862)

( Figs 22–26 )

Source of material. One specimen of instar II and three of instar III were used for the description ( Table 1). Larvae were collected in association with adults at the following localities: Western Australia, Yallingrup , 22-X-1996, coll. C. H. S. Watts ; 4 km SW Bunbury , 3-X-2003, coll. C. H. S. Watts.

Diagnosis (instar III). Medium-sized species (HL 0.55–1.15 mm); head ( Figs 22–23 ) 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 curved; secondary spiniform setae on lateral

Instar I. Not available.

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 more than 1.50 times longer than MP1; MP2 2.10–2.95 times longer than MP3; LP2 1.00–1.70 times longer than LP1. Legs. L3 more than 3.00 times longer than HW; CL(L3) more 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 25 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 proCO present; ventral secondary setae on 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-, meso- and metaTI present; metaTI with less than 5 secondary setae; secondary setae on proTA absent; posterodorsal and posteroventral secondary setae on meso- and metaTA present; 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 22–26 ). Head ( Figs 22–23 ). 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 24–25 ). L3 2.25–2.85 times longer than HW. Abdomen ( Fig. 26 ). U less than 2.10 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; proCO with 1–4 anterior secondary setae; mesoCO with 1–5 anterior secondary setae; pro-, meso and metaCO without posterior secondary setae; proCO with 12–15 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; anterodorsal secondary setae on pro-, meso- and metaTA absent; anteroventral secondary setae on proTA absent; anteroventral secondary setae on meso- and metaTA present; posterodorsal secondary setae on pro-, meso- and metaTA present; posteroventral secondary setae on pro- and mesoTA present; metaTA with 1–5 posteroventral secondary setae; 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 12. Secondary leg setation detailed in Table 20.

Remarks. This species belongs to the epigean Limbodessus characterized by the absence of secondary setae on the urogomphus ( L. amabilis , L. compactus ) ( Fig. 26 ). Within this group, L. shuckardii can be distinguished by its larger size, the absence of anterodorsal secondary setae on the tarsus ( Fig. 24 ), and the presence of posterodorsal secondary setae on the meso- and metatarsus.

Figures

FIGURES 22–26. Limbodessus shuckardii, third-instar larva. 22, head, dorsal aspect; 23, head, ventral aspect; 24, left prothoracic leg, anterior aspect; 25, right prothoracic leg, posterior aspect; 26, abdominal segment VIII and urogomphi, dorsal aspect. Scale bars = 0.10 mm.