Lasioerythraeus jessicae, Costa & Klompen & Bernardi & Gonçalves & Ribeiro & Pepato, 2019

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 : 148-158

publication ID	https://doi.org/ 10.11646/zootaxa.4717.1.10
publication LSID	lsid:zoobank.org:pub:D02BC715-6A77-4BD2-B452-51EAC10C6F99
persistent identifier	https://treatment.plazi.org/id/740587ED-FFD4-3526-FF30-FCAD4A5F13C4
treatment provided by	Plazi
scientific name	Lasioerythraeus jessicae
status	sp. nov.

Treatment

Lasioerythraeus jessicae View in CoL sp. nov.

Diagnosis

Larva: Palp setal formula: B-B-BBB-6B1ζ1ω; Dorsal setae heteromorphic with two shapes: flagelliform and bladelike ( Fig. 3E View 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. 5B View FIGURE 5 ); eye plate bearing two heteromorphic setae, one long and robust medial, and one short and thin lateral ( Fig. 5I View FIGURE 5 ). Anal valves placed at the distal end of the idiosoma (black arrow in Fig. 5A View FIGURE 5 ) and bearing 4 barbed setae each ( Fig. 5G View 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. 7A View FIGURE 7 ); palp tarsus with three to four spines (black arrow in Fig. 7A, B and F View FIGURE 7 ), palp tibia with smooth tibial claw ( Fig. 7F View 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. 7C View FIGURE 7 ); anal valves placed at the distal end of the idiosoma (black arrow in Fig. 6A View FIGURE 6 ).

Type Material. Holotype: Larva UFMG AC 161067 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 2016 GoogleMaps . Paratype deutonymph: UFMG AC 161064 . Paratype females: UFMG AC 161061, 161062, 161068, 161069 and 161070 (See Table I View TABLE I for detailed collecting data). The specimens were collected in the entrance and penumbra zone of unnamed caves .

Description

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. 3A View FIGURE 3 ), with two different shapes, flagelliform and blade like ( Fig. 3A and E View 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. 3D View FIGURE 3 ). Distance AP shorter than AW (AP<AW) ( Fig. 3D View 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. 3B View 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. 3B View 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. 3C View FIGURE 3 ).

Palp robust, with a bifid palptibial claw bearing setules ( Fig. 3F View FIGURE 3 ). Setal formula: 0-B-B-BBB-6B1ζ1ω. Eu- pathidium barbed with one basal, short and pointed bifurcation (Spn) ( Fig. 3F and G View 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. 4 View 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. 5A View FIGURE 5 ). Dorsal setae with weak setules and two shapes: long dorsal setae (pDS I) and short dorsal setae (pDS II) ( Fig. 5B View 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. 5B View FIGURE 5 ). Prodorsal sclerite absent ( Fig. 5B View 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. 5I View FIGURE 5 ). Anal valves placed at distal end of idiosoma (black arrow on Fig. 5A View FIGURE 5 ) and bearing four barbed setae on each valve ( Fig. 5G View 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. 5H View FIGURE 5 ). Gnathosoma conical bearing two long and stylet-like cheliceral blades and fringed lips (black arrow on Fig. 5C and D View FIGURE 5 ). Palps long, bearing weakly barbed setae ( Fig. 5F View FIGURE 5 ). Palp tibia with two spines (black arrows on Fig. 5F View 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 D View FIGURE 5 ).

Relative legs lengths: leg I>III>II. Leg scobalae numerous, pointed, with weak setules and two shapes: long and short ( Fig. 5E View 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. 5E View FIGURE 5 ; Fig. 4A View FIGURE 4 and Fig. 6B, C and D View FIGURE 6 ).

Female: Measurements summarized in Table IV. Color in life unknown. Idiosoma roughly oval ( Fig. 6A View FIGURE 6 ). Prodorsal sclerite absent ( Fig. 7C View 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. 7C View 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. 7C View FIGURE 7 ), however this character is less evident in some paratypes.Anal valves placed at the distal end of idiosoma (black arrow on Fig. 6A View FIGURE 6 ) and bearing 8–11 barbed setae each ( Fig. 7G View 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 E View FIGURE 7 ).

Gnathosoma conical with long, stylet-like, and fringed lips ( Fig. 7A and B View FIGURE 7 ). Palps long, bearing barbed setae. Palp femur punctate (arrowhead on Fig. 7A View FIGURE 7 ). Palp genu bearing three dorsal setae, two in the proximal half and one longer in the distal half (black arrow on Fig. 7A View FIGURE 7 ). Palp tarsus with three to four spines (black arrow on Fig. 7A, B and F View FIGURE 7 ) and an entire palp tibial claw ( Fig. 7F View FIGURE 7 ).

Relative legs lengths: IV>I>III>II. Leg scobalae numerous, pointed with weak setules ( Fig. 6A and B View 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 D View FIGURE 6 ). Tibia I bearing numerous dorsal solenidia on the dorsal side, most in distal half (black arrowhead on Fig. 6C View FIGURE 6 ).