Hardybodes minutus, Ermilov & Corpuz-Raros, 2018

Ermilov, Sergey G. & Corpuz-Raros, Leonila, 2018, Contribution to the knowledge of the oribatid mite genus Hardybodes (Acari, Oribatida, Carabodidae) with description of a new species from the Philippines, Acarologia 58 (1), pp. 131-139 : 133-138

Hardybodes minutus n. sp. ( Figures 1-4 )

Zoobank: E41DB0ED-5505-4971-9FC9-702D6C26463C

Diagnosis — Body size: 281 × 135–143. Rostral, lamellar and interlamellar setae short, narrowly phylliform, smooth. Bothridial setae of medium size, spathulate. Notogaster with hump-like median part and anterolateral and posterolateral concavities. Notogastral setae short, narrowly phylliform, smooth, setae da, dm, dp, lm, lp, h 1, h 2 inserted in a longitudinal row dorsomedially. Subcapitular setae h shorter than a and m. Epimeral, genital, aggenital and anal setae short, setiform, smooth. Adanal setae slightly phylliform, smooth. Leg tarsi IV with 11 setae (pv” absent), setae l” of genua I, II dilated distally.

Description — Measurements – Medium size. Body length: 281 (holotype, male), 281 (one paratype, male); notogaster width: 143 (holotype), 135 (paratype). Integument ( Figs 1A , 2B , 4B ) – Body brown. Body (including genital and anal plates, subcapitular mentum and genae) and legs densely granulate (diameter of granules up to 1), notogaster and some leg segments partially tuberculate (diameter of tubercles up to 8).

Prodorsum ( Figs 1 A–B, 2A, 3A) — Rostrum broadly rounded. Lamellae slightly shorter than prodorsum, broadly triangular distally. Rostral (10), lamellar (10) and interlamellar (10– 12) setae narrowly phylliform, smooth. Bothridial setae (36–41) with short stalk and longer, spathulate, barbed head. Exobothridial setae and their alveoli absent. Tutoria with triangular tip. Anterolateral parts of prodorsum with pair of concavities.

Notogaster ( Figs 1 A–B, 2A–B, 3B) — Median part elongate, hump-like. Anterolateral and posterolateral parts with one large concavity. Humeral shoulders indistinct in dorsal view. Fifteen pairs of notogastral setae short (4–6), narrowly phylliform, smooth; of these, seven pairs (da, dm, dp, lm, lp, h 1, h 2) inserted in longitudinal row dorsomedially, c 1 and da located close to each other. Lyrifissures, opisthonotal gland openings and circumgastric sigilla band well visible.

Gnathosoma ( Figs 3 C–E) — Subcapitulum longer than wide (57–61 × 49–53). Subcapitular setae (a, m, 6–8; h, 4–6) setiform, smooth. Adoral setae and their alveoli absent. Palps (32–36) with setation 0–2–1–3–8(+ω), acm absent. Solenidia (1/2 length of palptarsi) thickened, bluntended, pressed to the palptarsal surface. Postpalpal setae (2) spiniform, smooth. Chelicerae (57–65) with two setiform, barbed setae, cha (16–18) longer than chb (10–12). Trägårdh’s organ tapered.

Epimeral and lateral podosomal regions ( Figs 1B , 2A ) — Epimeral setal formula 3–1–3–3. All setae short (4), setiform, smooth. Pedotecta I represented by large and broad scales, pedotecta II are small scales, broadly triangular, rounded distally in ventral view. Discidia triangular, rounded distally.

Anogenital region ( Figs 1B , 2B , 3B ) — With indistinct concavities and ridges. Four pairs of genital, one pair of aggenital and two pairs of anal setae short (4–6) setiform, smooth. Three pairs of adanal setae (ad 1, ad 2, 6–8; ad 3, 4–6) slightly phylliform, smooth, ad 1, ad 2 inserted on the arch-like ridge posterior to the anal aperture. Adanal lyrifissures not discerned under the cerotegumental layer.

Legs ( Figs 4 A–D) — Claw of each leg strong, smooth. Porose areas of femora and trochanters III, IV well visible. Formulas of leg setation and solenidia: I (1–4–3–4–16) [1–2– 2], II (1–4–3–3–15) [1–1–2], III (2–3–1–2–15) [1–1–0], IV (1–2–2–2–11) [0–1–0]; homology of setae and solenidia indicated in Table 1. Famulus of tarsi short, erect, blunt-ended, inserted proximal to ω 1. Solenidion φ 1 of tibiae I long, setiform, other leg solenidia thickened, bluntended. Setae l” of genua I, II strongly dilated distally (palmate), barbed.

Type deposition — The holotype (ethanol with drop of glycerol) is deposited in SMNH ; one paratype (ethanol with drop of glycerol) is deposited in TSUMZ .

Note: Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (’) marks setae on the anterior and double prime (”) setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae. Tr – trochanter, Fe – femur, Ge – genu, Ti – Tibia, Ta – tarsus.

Etymology — The specific name minutus refers to the small body size of the new species.

Comparison — The new species differs from all species of the genus by the localization of notogastral setae lm and h 2 in same longitudinal row together with da, dm, dp, lp and h 1 (versus lm and h 2 inserted in dorsolateral position, setae da, dm, dp, lp and h 1 inserted in dorsocentral position).

Figures

Figure 1 Hardybodes minutus n. sp.: A – dorsal view; B – ventral view (legs except trochanters III, IV not illustrated). Scale bar 45 μm.

Figure 2 Hardybodes minutus n. sp.: A – anterior part of body, lateral view (legs except trochanter III not illustrated); B – posterior part of body, lateral view (legs except trochanter IV not illustrated). Scale bar 45 μm.

Figure 3 Hardybodes minutus n. sp.: A – prodorsum, frontal view; B – posterior view; C – subcapitulum, ventral view; D – palp, right, antiaxial view; E – chelicera, left, paraxial view. Scale bar 45 μm (A, B), scale bar 15 μm (C–E).

Figure 4 Hardybodes minutus n. sp.: A – trochanter, femur and genu of leg I, right, antiaxial view; B – leg II (trochanter partially covered by pedotectum II), right, antiaxial view; C – leg III except tarsus, left, antiaxial view; D – leg IV, left, antiaxial view. Scale bar 15 μm.