Truncozetes monodactylus, 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 : 27-29

Truncozetes monodactylus sp. n. Figs 3, 4

Diagnosis.

Body size 232 × 166. Translamella concave medially. Sensilli with lanceolate head densely ciliated on dorsal side. Dorso-central part of notogaster with large tubercle. Five pairs of genital and two pairs of anal setae. All leg tarsi monodactylous.

Description.

Measurements. Body length: 232 (holotype and paratype), 166 (holotype and paratype).

Integument. Body color brown. Surface covered by cerotegumental microgranules (visible under high magnification). Foveolae distinct, small (diameter up to 6).

Prodorsum. Rostrum narrowly rounded. Lamellae with lateral point anteriorly. Translamella thick, concave medially. Rostral setae of medium size (24), setiform, barbed. Lamellar (4) and interlamellar (2) setae minute. Sensilli (32) with short stalk and elongate-oval head, which is densely ciliate on dorsal side. Exobothridial setae and their alveoli absent. Tutotia knife-form, reaching insertions of rostral setae.

Notogaster. Concave posteriorly. Dorso-central part convex, with elongate hump-like tubercle (tbc). Posterior tubercle (tbp) well developed. Ten pairs of short (8-12), thin, smooth notogastral setae present. Three pairs of small sacculi visible, but S2 poorly visible. Position of lyrifissures asin Truncozetes ecuadoriensis sp. n. Opisthonotal gland openings not found.

Gnathosoma. Similar to Truncozetes ecuadoriensis sp. n.

Epimeral and lateral podosomal regions. Apodemal borders 2 (bo2) and 4 (bo4) wide, fused medially, brownish. Epimeral setal formula: 3 –1–2– 2. Epimeral setae short, setiform, smooth; 1a, 3a (2) shorter than 2a (4), 1b, 1c, 3b, 4a, 4b (8). Discidia triangular. Circumpedal carinae distinct.

Anogenital region. Five pairs of genital (4), one pair of aggenital (2), two pairs of anal (2) and two pairs of adanal (2) setae short. Lyrifissures iad located in paraanal position.

Legs. Similar to Truncozetes ecuadoriensis sp. n., but all tarsi with one strong claw.

Material examined.

Holotype (female), one paratype (female): Ecuador, 3°70'S, 78°58'W, Bombuscaro, Podocarpus National Park, 1050 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 (dissected) is in the personal collection of the first author.

Etymology.

The specific name “monodactylus” refers to the one claw on all leg tarsi.

Remarks.

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

Key to known species of Epactozetidae