Costa, Samuel Geremias Dos Santos, Klompen, Hans, Bernardi, Leopoldo Ferreira De Olivei- Ra, Gonçalves, Luciana Cardoso, Ribeiro, 2019, Multi-instar descriptions of cave dwelling Erythraeidae (Trombidiformes: Parasitengona) employing an integrative approach, Zootaxa 4717 (1), pp. 137-184: 148-158
treatment provided by
Lasioerythraeus jessicae sp. nov.
Larva: Palp setal formula: B-B-BBB-6B1ζ1ω; Dorsal setae heteromorphic with two shapes: flagelliform and bladelike ( Fig. 3EView FIGURE 3); fn Ge 8-8-8; fn Ti 15-15-15. No variation could be observed because only one larval specimen was available.
Deutonymph: Anterior sensillar area bearing three robust and weakly barbed setae; prodorsal sclerite absent ( Fig. 5BView FIGURE 5); eye plate bearing two heteromorphic setae, one long and robust medial, and one short and thin lateral ( Fig. 5IView FIGURE 5). Anal valves placed at the distal end of the idiosoma (black arrow in Fig. 5AView FIGURE 5) and bearing 4 barbed setae each ( Fig. 5GView FIGURE 5); No variation could be observed because only a single deutonymph was available.
Female: Palp genu bearing three dorsal setae, two in the proximal half and one longer one in the distal half (black arrow in Fig. 7AView FIGURE 7); palp tarsus with three to four spines (black arrow in Fig. 7A, B and FView FIGURE 7), palp tibia with smooth tibial claw ( Fig. 7FView FIGURE 7); crista metopica bearing two pairs of filiform sensilla with faint setules and nine robust blade-like setae with distinct setules, 118–248 long; among those nine setae, four (L1 and L2) are placed between the two sensillar areas and five in the anterior sensillar area, three anterior, and two posterior, to the anterior sensilla ( Fig. 7CView FIGURE 7); anal valves placed at the distal end of the idiosoma (black arrow in Fig. 6AView FIGURE 6).
Type Material. Holotype: Larva UFMG AC 161067View Materials collected by active search at 19°05’46.0”S, 43°21’25.0”W, in an iron ore terrain cave, Conceição do Mato Dentro municipality, Minas Gerais State, Brazil, between July 26 and October 13 of 2016GoogleMaps . Paratype deutonymph: UFMG AC 161064View Materials . Paratype females: UFMG AC 161061View Materials, 161062, 161068, 161069 and 161070 (See Table I for detailed collecting data). The specimens were collected in the entrance and penumbra zone of unnamed caves .
Larva: Measurements summarized in Table II. Idiosoma roughly oval with more than 50 dorsal barbed setae (precise number unknown due to the rupture of the idiosoma, Fig. 3AView FIGURE 3), with two different shapes, flagelliform and blade like ( Fig. 3A and EView FIGURE 3). Scutum punctate, wider than long, with two pairs of scutella and two pairs of sensilla; anterior sensilla with longer barbs in distal half, while the posterior sensilla is homogeneously barbed ( Fig. 3DView FIGURE 3). Distance AP shorter than AW (AP<AW) ( Fig. 3DView FIGURE 3). Anterior sensilla shorter than posterior (Asens<Psens). Two pairs of eyes on soft cuticle, without an evident eye plate. Idiosoma ventrally with two barbed setae at level of coxae I (1a), two between coxae II and III (2a) and two barbed at level of coxae III (3a), followed by numerous setae with uncertain positions, due to damage ( Fig. 3BView FIGURE 3). Coxae I, II, and III with one barbed seta each (1b, 2b and 3b), setae 1b much longer than 2b and 3b ( Fig. 3BView FIGURE 3).
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Gnathosoma bearing two pairs of smooth ventral hypostomal setae (as and bs), one pair of smooth galeala (cs) and one pair of microsetae (elcp). Cheliceral blades short and curved ( Fig. 3CView FIGURE 3).
Palp robust, with a bifid palptibial claw bearing setules ( Fig. 3FView FIGURE 3). Setal formula: 0-B-B-BBB-6B1ζ1ω. Eu- pathidium barbed with one basal, short and pointed bifurcation (Spn) ( Fig. 3F and GView FIGURE 3).
Leg setae barbed. Legs III longer than legs I, which are longer than legs II. All tarsi with two identical branched claws and a claw-like empodium with a terminal hook ( Fig. 4View FIGURE 4).
Leg setal formula:
Leg I: Ta—24B, 2 ζ, 1 ω, 1ɛ; Ti—15B, 1κ, 2 φ; Ge—8B, 1κ, 1 σ; Tf—5B, Bf—4B; Tr—1B; Cx—1B.
Leg II: Ta—21B, 1 ζ, 1 ω; Ti—15B, 2 φ; Ge—8B, 1κ; Tf—5B; Bf—4B; Tr—1B; Cx—1B.
Leg III: Ta—22B, 1 ζ; Ti—15B,1 φ; Ge—8B; Tf—5B; Bf—3B; Tr—1B; Cx—1B.
Deutonymph: Measurements summarized in Table III. Color in life unknown. Idiosoma roughly oval ( Fig. 5AView FIGURE 5). Dorsal setae with weak setules and two shapes: long dorsal setae (pDS I) and short dorsal setae (pDS II) ( Fig. 5BView FIGURE 5). Crista metopica bearing two pairs of filiform sensillar setae with faint setules and seven robust (125–160) setae with distinct setules. Of those seven, four are placed between the two sensillar areas and three in the anterior sensillar area, anteriorly to the anterior sensilla ( Fig. 5BView FIGURE 5). Prodorsal sclerite absent ( Fig. 5BView FIGURE 5). Two pairs of eyes placed in an eye plate with two heteromorphic setae: one medial long and robust and the other lateral, shorter and thin ( Fig. 5IView FIGURE 5). Anal valves placed at distal end of idiosoma (black arrow on Fig. 5AView FIGURE 5) and bearing four barbed setae on each valve ( Fig. 5GView FIGURE 5). This unusual position of the anal plates can be observed in the specimens before those were mounted on slides, indicating that it is not an artifact of the slide mounting process. Genital valve bearing three setae ( Fig. 5HView FIGURE 5). Gnathosoma conical bearing two long and stylet-like cheliceral blades and fringed lips (black arrow on Fig. 5C and DView FIGURE 5). Palps long, bearing weakly barbed setae ( Fig. 5FView FIGURE 5). Palp tibia with two spines (black arrows on Fig. 5FView FIGURE 5), seven barbed setae, and an entire palp tibial claw; palp genu bearing 14 weakly barbed setae; palp femur with 30 weakly barbed setae ( Fig. 5C and DView FIGURE 5).
Relative legs lengths: leg I>III>II. Leg scobalae numerous, pointed, with weak setules and two shapes: long and short ( Fig. 5EView FIGURE 5). Tibia I bearing 20 solenidia on dorsal side, most in distal half. Genu I and tibia I bearing one microseta each, the microsetae are relatively long, 12–15 (κ1 and κ2, respectively); shape and position similar to microsetae in larva and female ( Fig. 5EView FIGURE 5; Fig. 4AView FIGURE 4 and Fig. 6B, C and DView FIGURE 6).
Female: Measurements summarized in Table IV. Color in life unknown. Idiosoma roughly oval ( Fig. 6AView FIGURE 6). Prodorsal sclerite absent ( Fig. 7CView FIGURE 7). Crista metopica bearing two pairs of filiform sensillar setae with faint setules and 9–11 robust setae with distinct setules (118–248). One paratype carries eleven setae, all others nine, two pairs positioned between the two sensillar areas and five to seven on the anterior sensillar area, three anterior, two to four posterior to anterior sensilla ( Fig. 7CView FIGURE 7). The specimen with eleven setae has an asymmetric distribution, apparently with one seta positioned posterior to the sensilla triplicated. Two pairs of eyes placed in an eye plate with two heteromorphic setae: one medial long and robust and the other lateral, shorter and thin (circled on Fig. 7CView FIGURE 7), however this character is less evident in some paratypes.Anal valves placed at the distal end of idiosoma (black arrow on Fig. 6AView FIGURE 6) and bearing 8–11 barbed setae each ( Fig. 7GView FIGURE 7). Genital pore bearing two heteromorphic pairs of genital acetabula (G. ac), the anterior one is kidney-like and the posterior one pea-like ( Fig. 7D and EView FIGURE 7).
Gnathosoma conical with long, stylet-like, and fringed lips ( Fig. 7A and BView FIGURE 7). Palps long, bearing barbed setae. Palp femur punctate (arrowhead on Fig. 7AView FIGURE 7). Palp genu bearing three dorsal setae, two in the proximal half and one longer in the distal half (black arrow on Fig. 7AView FIGURE 7). Palp tarsus with three to four spines (black arrow on Fig. 7A, B and FView FIGURE 7) and an entire palp tibial claw ( Fig. 7FView FIGURE 7).
Relative legs lengths: IV>I>III>II. Leg scobalae numerous, pointed with weak setules ( Fig. 6A and BView FIGURE 6), palp tibia bearing numerous dorsal solenidia. Genu and tibia with one long, 18–19 µm seta each (κ1 and κ2 respectively) ( Fig. 6B, C and DView FIGURE 6). Tibia I bearing numerous dorsal solenidia on the dorsal side, most in distal half (black arrowhead on Fig. 6CView FIGURE 6).
Universidade Federal de Minas Gerais
Amherst College, Beneski Museum of Natural History
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