Malaconothrus humboldtensis Ermilov, 2016

Ermilov, S. G., Tolstikov, A. V. & Salavatulin, V. M., 2016, Additions to the Cuban oribatid mite fauna (Acari, Oribatida), including new records and descriptions of two new species from the genera Eupelops (Phenopelopidae) and Malaconothrus (Malaconothridae), Acarologia 56 (1), pp. 99-114 : 108

Malaconothrus humboldtensis Ermilov n. sp.

( Figures 5-8)

Diagnosis — Body size: 398 – 431 × 166 – 190. Body surface porose, covered by microtuberculate cerotegument. Prodorsal setae smooth, interlamellar setae considerably longer than ex 1. Notogastral ridges present. Notogastral setae smooth; e 1, e 2, p 2 and h 2 longer than other setae. Epimeral setal formula: 3-1-3-3; 3b and 3c longest. Five pairs of genital setae, g 1 heavily barbed, other setae indistinctly barbed. Adanal setae dilated medio-basally, smooth. Legs monodactylous.

Description — Measurements — Body length: 431 (holotype: female), 398 – 431 (6 paratypes: all females); notogaster width: 182 (holotype), 166 – 190 (6 paratypes).

Integument ( Figs 5A; 6A; 8 A-D) — Body color light grey to yellowish. Body surface finely porose (clearly visible under high magnification) and covered by tuberculate cerotegument (tubercles rounded or slightly elongated, conical, their diameter and length up to 4).

Prodorsum ( Figs 5A, B) — Rostrum broadly rounded. Lateral carinae strong, reaching insertions of rostral setae, connected by translamellar ridge. Rostral (32 – 36), lamellar (41 – 45), interlamellar (53 – 57) and exobothridial setae ex 1 (18 – 20) setiform, smooth. Exobothridial setae ex 2 represented by alveoli.

Notogaster ( Figs 5A, B; 6A, B; 8A ) — Anterior margin straight. Posterior margin rounded. Notogaster with ridges and slight concavities between them. All notogastral setae setiform, smooth; e 1, e 2, h 2 and p 2 (53 – 61) longer than other eleven pairs (28 – 36). Insertions of h 2 and p 2 located nearly to each other in one transverse row. Lyrifissures ia, im, ip, ih and ips distinct.

Gnathosoma ( Figs 5C; 6C) — Subcapitulum longer than wide (69 – 73 × 57 – 61). Subcapitular setae setiform, smooth, h and m (both pairs 24) longer than a (16). Palps (length 49) with setation 0-2-1-3-9(+ω). Postpalpal setae e (6) spiniform, smooth. Chelicerae (length 73 – 77) with two dorsal teeth (4) and two smooth setae, cha (10) thin, straight, shorter than thickened, curved chb (12).

Figures

FIGURE 8: Malaconothrus humboldtensis Ermilov n. sp., microscope images of dissected specimen: A – microfoveolate body near to notogastral setae cp and d3, B – cerotegument in centro-dorsal part of notogaster; C – subcapitular mentum and parts of epimeres I and II; D – parts of epimeres II, III and IV; E – ano-adanal region; F – medio-distal part of tarsus I, right, paraxial view. Scale bar 20 µm.