Truncozetes ecuadoriensis, Ermilov, Sergey G., Sandmann, Dorothee, Marian, Franca & Maraun, Mark, 2013

Ermilov, Sergey G., Sandmann, Dorothee, Marian, Franca & Maraun, Mark, 2013, Two new species of oribatid mites of the genus Truncozetes (Acari, Oribatida, Epactozetidae) from Ecuador, ZooKeys 303, pp. 23-31 : 24-26

Truncozetes ecuadoriensis sp. n. Figs 1, 2, 5-17

Diagnosis.

Body size 315-332 × 215-232. Translamella thin, straight. Sensilli with weakly barbed elongate-oval head. Five pairs of genital and two pairs of anal setae present. Leg tarsus I monodactylous, leg tarsi II–IV tridactylous.

Description.

Measurements. Body length: 315 (holotype), 315, 332 (two paratypes); notogaster width: 215 (holotype), 215, 232 (two paratypes).

Integument. Body color brown. Surface covered by cerotegumental microgranules (visible under high magnification). Foveolae distinct, larger on pteromorphs (diameter up to 12).

Prodorsum. Rostrum widely rounded. Lamellae with lateral point anteriorly. Translamella very thin, straight. Rostral setae (ro) of medium size (41-45), setiform, barbed. Lamellar (le, 6-8) and interlamellar (in, 2-4) setae short, thin, smooth. Sensilli (ss, 53-61) with short stalk and weakly barbed elongate-oval, head. Exobothridial setae and their alveoli absent. Tutotia (tu) knife-form, with long and sharp cusps, reaching insertions of rostral setae.

Notogaster. Weakly concave posteriorly. Posterior tubercle (tbp) poorly developed. Ten pairs of short (12-16), thin, smooth notogastral setae. Three pairs of small sacculi: Sa inserted antero-medially to setae la; S1 - antero-medially to setae h2; S2- antero-laterally to setae h1. Lyrifissures ia located on pteromorphs, but poorly visible; im– antero-laterally to setae h3; ip - postero-laterally to sacculi S2; ih and ips located in lateral positions. Opisthonotal gland openings not found.

Gnathosoma. Subcapitulum longer than wide (77 × 61). Subcapitular (h, m, a) and adoral (or1, or2) setae similar in length (12) setiform, smooth. Palps (61) with setation 0 –2–1–3– 9 (+ω). Solenidion (ω) thickened, straight, attached with eupathidium (acm). Chelicerae (77) with one setiform, barbed seta (cha, 24); possible chb also present, but we found only their alveolus in dissected specimen. Trägårdh’s organ (Tg) long, elongate conical.

Epimeral and lateral podosomal regions. Apodemal border 4 (bo4) complete, wide, brownish. Epimeral setal formula: 3 –1–2– 2. Epimeral setae short, setiform, smooth; 1a, 3a (2) shorter than 2a (8), 1b, 1c, 3b, 4a, 4b (12-16). Discidia (dis) triangular. Circumpedal carinae (cp) distinct.

Anogenital region. Five pairs of genital (g1-g5, 8), one pair of aggenital (ag, 2-4), two pairs of anal (an1, an2, 2-4) and two pairs of adanal (ad1, ad2, 2-4) setae short, setiform, thin, smooth. Lyrifissures iad located in paraanal position.

Legs. Tarsus I with one claw, tarsi II–IV with three claws. Dorsal side of tarsus I and dorso-proximal part of tibia IV with strong thorn (t); antero-ventral side of genu I with small thorn; ventral side of tarsus I and tibia I with large tubercles (tb). Formulae of leg setation and solenidia: I (1 –5–3–4– 20) [1 –2– 2], II (1 –5–2–3– 15) [1 –1– 2], III (1 –2–1–2– 15) [1 –1– 0], IV (0 –2–1–2– 12) [0 –1– 0]; homology of setae and solenidia indicated in Table 1. Famulus (e) thin, straight, inserted anteriorly to thorn. Setae barbed (except smooth p and s on tarsus I). Solenidia ω 1 on tarsus I, ω 1, ω 2o n tarsus II, σ on genua III thickened, blunt-ended, other solenidia setiform.

Material examined.

Holotype (male), two paratypes (male, female): Ecuador, 3°58'S, 79°50'W, Estación Científica San Francisco, 2000 m a.s.l., upper organic soil layer in mostly undisturbed rain forest, 01.04.2009, collected by F. Marian and D. Sandmann.

Type deposition.

The holotype (in alcohol) is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; one paratype (in alcohol) is deposited in the collection of the Siberian Zoological Museum, Novosibirsk, Russia; one paratype (dissected) is in the personal collection of the first author.

Etymology.

The specific name “ecuadoriensis” refers to the country of origin, Ecuador.

Remarks.

The new species is clearly distinguishable from other known species of the genus Truncozetes by the different number of leg claws (leg I monodactylous, legs II–IV tridactylous versus all legs monodactylous or tridactylous). Additional distinctive characters of a new species with the other species of the genus can be found in the identification key given below.