Lasioerythraeus Welbourn & Young, 1987

Costa, Samuel Geremias Dos Santos, Klompen, Hans, Bernardi, Leopoldo Ferreira De Olivei- Ra, Gonçalves, Luciana Cardoso, Ribeiro, Dante Batista & Pepato, Almir Rogério, 2019, Multi-instar descriptions of cave dwelling Erythraeidae (Trombidiformes: Parasitengona) employing an integrative approach, Zootaxa 4717 (1), pp. 137-184 : 148

Genus Lasioerythraeus Welbourn & Young, 1987

Generic diagnosis for larvae following Welbourn & Young (1987).

For adults and deutonymphs (DN):

Crista metopica surrounded by a prodorsal sclerite between the prodorsal trichobothria in the six species described but not in La. jessicae sp. nov.; anterior sensillary area with 5–10 long setae (3–4 in DN) and a pair of trichobothria; between the anterior and posterior trichobothria are 2 pairs of long truncate setae (L1 and L2, Fig. 5 and 7 ), 1–4 pairs of intermediate-length setae near the posterior pair of trichobothria; 1 pair of eyes on each side of the crista metopica, each pair set on an ocular sclerite with a pair of setae; dorsal idiosomal setae of two distinct types, scattered long and truncate and the more numerous short and acute setae, Gnathosoma: Palpal genu with a single long seta along dorsal surface ( Fig. 7 ); palpal tibia with 3–4 ventral conelike spines (2 in DN), spines sometimes with small serrations. Legs: femora on all legs divided (basifemur and telofemur). Microseta (κ) present on distal end of genu legs I, II, and tibia leg I. Modified from Welbourn & Young (1987).

Figures

FIGURE 5. Lasioerythraeus jessicae sp. nov. deutonymph.A: General view, black arrow pointing the anal pore; B: Crista metopica, eye plate indicated; C and D: Palp dorsal and ventral view, arrow pointing the gnathosoma lips; E: Tarsus and tibia I; F: Palp tarsus and tibia, arrow pointing two spines; G:Anal pore; H: Undeveloped genital plate; I: Eye plate, arrow heads indicating a pair of heteromorphic setae. Scale: A= 1000 µm; B and E= 200 µm; C and D= 100 µm; F, G, H and I= 50 µm.

FIGURE 7. Lasioerythraeus jessicae sp. nov. Female.A: Gnathosoma ventral view, arrow pointing at dorsal robust setae, arrow head pointing to punctations on the palp-femur. B: Gnathosoma dorsal view, arrow pointing to the spines on palp-tibia. C: Crista metopica, eye plate circled. D: Genital pore superficial view. E: Genital pore internal structures showing the genital acetabula (G. ac.). F: Palp tiba and tarsus. G: Anal pore. Scale: A–E= 200 µm; F and G= 100 µm.