Caramuruacarus carnavalesca Bassini-Silva and Jacinavicius, 2022

Bassini-Silva, R., Zampaulo, R. A., Welbourn, C., Ochoa, R., Brescovit, A. D., Barros-Battesti, D. M. & Jacinavicius, F. C., 2022, A new genus and two new species of chigger mites (Trombidiformes: Leeuwenhoekiidae) from Brazilian caves with notes about the genus Whartonia Ewing, 1944, Journal of Natural History 56 (29 - 32), pp. 1297-1313 : 1302-1304

Caramuruacarus carnavalesca Bassini-Silva and Jacinavicius sp. nov.

( Figures 2–5 and 10 ; Tables 1–4 )

Description.

Larva (holotype). Gnathosoma – fPp = B/B/BNB/5Bω; odontus tetrafurcate; cheliceral blade with tricuspid cap and the ventral side with ventral row of large blunt of 8 to 10 teeth; gnathobase punctate, subcapitular (bs) and adoral (cs) setae branched ( Figure 2 (a,b)). Idiosoma – eyes present, 2/2, set in ocular plate, anterior lens larger; prodorsal sclerite with sparse punctations ( Figures 3 , 10 (a)), anterior margin slightly sinuous with nasus, lateral and posterior margins concave; with pair of nude flagelliform trichobothria (si), and four slightly expanded setae [pair of ve (= AL) setae and pair of vi (= AM) setae] plus a pair of expanded and leaflike se (= PL) setae, with long and triangular setules; se> si> vi ≥ ve; tracheae and stigma absent; opisthosoma ( Figure 4 (a,b)) with a total of 91 setae, dorsal opisthosoma with 46 setae, C row with 16 setae, D and E rows with eight setae each, F row with six setae and H row with eight setae irregularly placed, and 45 ventral opisthosomal setae (22 setae anterior to the anus and 23 posterior setae). Dorsal and lateral ventral opisthosomal setae expanded and modified, leaflike, like se setae ( Figure 10 (b,c)); One pair of sternal setae (3a) between coxal fields III. Legs – femur of legs I–III not divided into basifemur and telofemur, each leg terminates with pair of claws and claw-like empodium without onychotriches, coxal fields punctate; Leg I – coxal field setae 1a and 1b branched (2B); trochanter 1B; femur 6B; genu 4B, 2 σ and Κ; tibia 8B, 2 φ and Κ; tarsus 23B with ω, ε, and subterminal eupathidium (ζ), base of famulus (ε) distal to solenidion (ω) ( Figure 5 (a)). Leg II – coxal field seta 2b (1B); trochanter 1B; femur 5B; genu 4B, σ and Κ; tibia 6B, 2 φ; tarsus 16B with ω, ε and subterminal eupathidium (ζ), base of ε proximal to ω ( Figure 5 (b)). Leg III – coxal field seta 3b (1B) in distal position; trochanter 1B; femur 4B; genu 4B, tibia 6B, φ; tarsus 15B ( Figure 5 (c)).

Type material

Holotype. Larva, Cave CH-25 , Santa Rita de Ouro Preto, Minas Gerais State, Brazil, (20.552° S, 43.514°W); 28–30 April 2009; on the soil; F. Pellegatti et al. coll.; deposited as IBSP 15693 . Etymology. The specific name ‘carnavalesca’ (adjective related to Carnaval) refers to the extravagance of the dorsal opisthosomal setae, se setae and some ventral setae that recall the costumes of the Carnaval – a traditional Brazilian festival.

Figures

Figure 2. Caramuruacarus carnavalesca Bassini-Silva and Jacinavicius sp. nov.: (a) dorsal view of gnathosoma; (b) ventral view of palp. Abbreviations: ω = solenidion on palptarsus; bs = subcapitular setae; cs = adoral setae; Odo = odontus. Scale bar: 50 μm.

Figure 3. Caramuruacarus carnavalesca Bassini-Silva and Jacinavicius sp. nov.: prodorsal sclerite. Open circles = ornamentations of the prodorsal sclerite. Abbreviations: se = external scapular setae; si = internal scapular setae (trichobothria); ve = external vertical setae; vi = internal vertical setae. Scale bar: 20 μm.

Figure 4. Caramuruacarus carnavalesca Bassini-Silva and Jacinavicius sp. nov.: (a) dorsal view of idiosoma; (b) ventral view of idiosoma. Solid circles = ventral setae; open circles = dorsal setae. Abbreviations:d1–d4 = D row setae; e1–e4 = E row setae; f1–f3 = F row setae;1a = anterior sternal setae inside coxal field I; 1b = coxal field I seta; 2b = coxal field II seta; 3a = posterior sternal setae; 3b = coxal field III seta. Scale bars: 100 μm.

Figure 5. Caramuruacarus carnavalesca Bassini-Silva and Jacinavicius sp. nov.: (a) leg I; (b) leg II; (c) leg III. Solid circles = ventral leg setae; open circles = dorsal leg setae. Abbreviations: ζ = subterminal eupathidium on Tarsus I and II; ω = solenidion on Tarsus I and II; σ, σ’, σ” = solenidia on Genu I and II; Κ = microsetae on Genu I, II and Tibia I; φ, φ’, φ” = solenidia on Tibia I–III; Ε = famulus on Tarsus I and II; 1a = anterior sternal setae inside the coxal field I; 1b = coxal field I seta; 2b = coxal field II seta; 3b = coxal field III seta. Scale bars: 50 μm.

Figure 10. Phase contrast images of the new leeuwenhoekiid mites. Caramuruacarus carnavalesca Bassini-Silva and Jacinavicius sp. nov.: (a) prodorsal sclerite; (b) dorsal ophistosomal setae; (c) distal dorsal ophistosomal setae. Whartonia parauapebensis Bassini-Silva and Jacinavicius sp. nov.: (d) prodorsal sclerite; (e) dorsal ophistosomal seteae; (f) palp and gnathosoma with the chelicerae. The black arrow indicates two larger supplementary prongs in the middle of the odontus. Abbreviations: se = external scapular setae; si = internal scapular setae (trichobothria); ve = external vertical setae; vi = internal vertical setae. Scale bars: 20 μm.