Gymnobodes minimus, Ermilov, 2016

Ermilov, S. G., 2016, Contribution to the knowledge of carabodid oribatid mites (Acari, Oribatida, Carabodidae) of Cuba, Acarologia 56 (1), pp. 33-43 : 39-42

Gymnobodes minimus n. sp.

( Figures 5-6 )

Diagnosis — Body size: 270 – 282 × 135 – 143. Notogaster tuberculate. Anogenital region with ribs. Rostral and lamellar setae similar short, thin, smooth. Interlamellar, notogastral and ventral setae minute. Bothridial setae with flattened head covered by barbs and ribs. Tutoria absent.

Description — Measurements — Body length: 270 (holotype, male), 282 (one paratype: female); notogaster width: 143 (holotype), 135 (one paratype).

Integument ( Figs 5 A-C; 6A-D) — Body yellowbrownish. Notogaster with clearly separated tubercles (diameter up to 8). Anogenital region with ribs. Lateral sides of prodorsum and genital and anal plates with foveolae (diameter up to 2).

Prodorsum ( Figs 5A, C, D ; 6E, F ) — Rostrum rounded. Translamella not developed. Rostral and lamellar setae similar in length (10 – 12), thin, smooth, interlamellar setae minute (4), all inserted on prodorsum. Bothridial setae (32) with longer, smooth stalk and shorter, flattened head covered by barbs and ribs, directed laterally. Exobothridial setae and their alveoli absent. Small concavity located anteriorly to interlamellar setae. Tutoria absent.

Notogaster ( Figs 5A, C ) — Anterior notogastral margin slightly convex medially. Humeral shoulders distinctly visible, pointed anteriorly. Ten pairs of notogastral setae similar in length, minute (4). Lyrifissures and opisthonotal gland openings not found under tuberculate layer.

Gnathosoma — Subcapitulum longer than wide (57 × 41). Subcapitular setae setiform, thin, indistinctly barbed, similar in thickness, a and m (both 6 – 8) longer than h (4). Adoral setae absent. Postpalpal setae e (8) straight, strong, barbed. Palps (36) with setation 0-2-1-3-8(+ω). Solenidion of palptarsi thickened, blunt-ended, pressed to their surface. Chelicerae (69) with two setiform, barbed setae; cha (20) longer than chb (8). Trägårdh’s organ tapered, rounded distally.

Epimeral and lateral podosomal regions ( Figs 5B ; 6G ) — Epimeral setal formula 1-1-3-3. Epimeral setae minute (4). Pedotecta I large, scale-like (in lateral view); pedotecta II slightly developed. Discidia small, triangular, blunt distally.

Anogenital region ( Figs 5B ; 6G ) — Four pairs of genital, one pair of aggenital, two pairs of anal and three pairs of adanal setae similar in length, minute (4). Adanal lyrifissures not visible.

Legs ( Fig. 6C ) — Generally, similar to Carabodes paravenezolanus n. sp., but tc’ present and solenidion ω 1 on tarsi I curved backwards distally. Homology of setae and solenidia indicated in Table 1.

Material examined — Holotype (male) and one paratype (female): Cuba, Cayo Santa Maria, 22°66’21"N, 78°96’88"W, leaf litter in forest (unknown date and collector, mites were previously deposited in the Museum of Zoology of Tyumen State University , Russia).

Type deposition — The holotype (alcohol) is deposited in the collection of the Senckenberg Institute , Görlitz, Germany ; one paratype (alcohol) is in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology — The specific name minimus refers to the small body size.

Remarks — The known species of the genus Gymnobodes can be distinguished by the key which is presented below.

Figures

FIGURE 5:. Gymnobodes minimus n. sp.: A – dorsal view; B – ventral view (gnathosoma and legs except basal parts not illustrated); C – anterior part of body, lateral view (gnathosoma and leg I except basal part not illustrated); D – rostrum, dorso-frontal view. Scale bars 50 µm.

FIGURE 6: Gymnobodes minimus n. sp., microscope images in dissected specimen: A, B – tubercles in centrodorsal part of notogaster; C – foveolae on femora I; D – ornamentation in adanal region; E – lamella and rostral seta; F – bothridial seta; G – left genital plate and part of epimeral region. Scale bar 20 µm.