Hammerella (Woasella) huanucoensis Ermilov, 2016

Ermilov, S. G. & Friedrich, S., 2016, Additions to the oppioid oribatid mite fauna of Peru (Acari, Oribatida, Oppioidea), Acarologia 56 (3), pp. 379-391 : 385-389

Hammerella (Woasella) huanucoensis Ermilov n. sp.

( Figures 4–6)

Diagnosis — Body size: 298 – 332 × 166 – 182. Rostrum with median indentation. Costulae slightly developed. Transcostula absent. Lamellar setae shorter and thinner than rostral and interlamellar setae, all barbed. Exobothridial setae shortest. Bothridial setae with long stalk and shorter head, having five to six long cilia and some short barbs unilaterally. Ten pairs of notogastral setae present, setae c minute, other setae of medium size, smooth. Epimeral setae setiform, slightly barbed. Discidia absent. Anogenital setae smooth.

Description — Measurements – Body length: 332 (holotype: female), 298 – 332 (16 paratypes: seven females and nine males); notogaster width 182 (holotype), 166 – 182 (16 paratypes). No differences between females and males in the body sizes.

Integument ( Figs 4A, 5A ) — Body color light brownish. Body surface punctate, lateral side and podosomal region with sparse tuberculate cerotegument (diameter tubercle up to 4).

Prodorsum ( Figs 4A, 5A ) — Rostrum with small median indentation (ind; well visible in frontal view). Costulae short, thin, parallel. Transcostula absent. Rostral (28), lamellar (18 – 20), interlamellar (32) and exobothridial (16 – 20) setae setiform, barbed; le and ex thinnest, le located nearer to interlamellar setae, than to rostral setae. Transverse thin ridge (r) located posteriorly to insertions of rostral setae. Bothridial setae (53 – 57) with long stalks and shorter, elongate, rounded distally heads, having five to six of long (45 – 53) cilia and three to five of short barbs unilaterally. Longitudinal row of muscle sigilla present anteriad to bothridia and lateral to costulae. Interbothridial region with two pairs of muscle sigilla. Interbothridial tubercles absent. Postbothridial tubercles present.

Notogaster ( Figs 4A, 5A ) — Anterior border straight. Humeral tubercles indistinct, directed to postbothridial tubercles. Ten pairs of notogastral setae present, setae c minute (2), other setae setiform, smooth, inserted in four parallel rows (except posterior setae). Setae p 2 and p 3 (20–24) shorter than p 1 (24–28), other setae longest (32–41) and thickest. All lyrifissures clearly visible. Opisthonotal gland openings located posterior to im and distanced from it.

Gnathosoma ( Figs 4B, 5A , 6A–C ) — Morphology of subcapitulum, palp and chelicera typical for Hammerella (e.g. Franklin and Woas 1992; Ermilov et al. 2012). Subcapitulum longer than wide (73 – 77 × 53 – 57). Antero-medial parts of rutelli with thin tooth. Three pairs of subcapitular setae setiform; m longest (28) barbed, h (24) sparsely ciliate on dorsal side, a shortest (16), barbed. Two pairs of adoral setae (6) thin, smooth. Palps (41 – 45) with setation 0–2–1–3–8(+ω); solenidion of palptarsi as long as one third of tarsi, thick, expanded distally, pressed to the surface, attached in mediodistal parts to seta ul". Chelicerae (69 – 73) with two setiform, barbed setae; cha (20) longer than chb (12) barbed. Trägårdh’s organ tapered, slightly granulate.

Epimeral and lateral podosomal regions ( Figs 4B, 5A ) — Sejugal apodemes and apodemes 2 short, similar in length, apodemes 4 absent, substituted by muscle sigilla. Epimeral setal formula: 3–1–3–3; all setae setiform, slightly barbed, 1a, 2a and 3a (16– 20) shorter than 1b, 3b, 3c, 4a, 4b and 4c (32 – 41), 1c longest (45 – 53), inserted on pedotecta I, 3c inserted on tubercles. Discidia absent.

Anogenital region ( Figs 4B, 5A ) — Six pairs of genital setae minute (g 1 – g 6, 8). One pair of aggenital (32), three pairs of adanal (32) and two pairs of anal (16 – 20) setae setiform, smooth. Adanal lyrifissures distinct, inverse apoanal, distanced from the anal aperture.

Legs ( Figs 4A, B, 5A–C ) — Morphology of leg segments, setae and solenidia typical for Hammerella (e.g. Franklin and Woas 1992; Ermilov et al. 2012). Claw of each leg indistinctly serrate on dorsal side. Formulas of leg setation and solenidia: I (1–5–2–4– 20) [1–2–2], II (1–5–2–4–16) [1–1–2], III (2–3–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1–0]; homology of setae and solenidia indicated in Table 1. Setae p setiform on tarsi I, and very short, conical on tarsi II–IV. Famuli (Ɛ) of tarsi I short, thin, swollen and truncated distally, inserted posteriorly to solenidion ω 1.

Type deposition — The holotype is deposited in the collection of the Museo de Historia Natural , Universidad Nacional Mayor de San Marcos, Lima, Peru ; two paratypes are deposited in the collection of the Bavarian State Collection of Zoology , Munich, Germany ; two paratypes are deposited in the collection of the Senckenberg Institution Frankfurt , Germany ; 12 paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology — The specific name huanucoensis refers to the Peruvian Department, HuAEnuco, where the new species was collected.

Remarks — The genus Hammerella comprises five subgenera and 13 species, and is distributed in the tropics ( Subías 2004, updated 2016). The main morphological traits for these genus and subgenera and an identification key for all species (known to 2012) of Hammerella were presented by Ermilov et al. (2012).

The new species is morphologically most similar to Hammerella (Woasella) parasufflata Ermilov, Sandmann, Marian and Maraun, 2013 from Ecuador (see Ermilov et al. 2013) in having an indentate rostrum and ciliate unilaterally bothridial seta. However, it differs from the latter by the thin costulae (vs. thick), shorter notogastral setae (vs. comparatively longer), and the absence of tubercles anterior to lamellar setae (vs. present).

Figures

FIGURE 5: Hammerella (Woasella) huanucoensis Ermilov n. sp.: A – lateral view, right side (gnathosoma and legs except basal part of legs I, III and IV not illustrated); B – tibia (solenidion not illustrated) and basal part of tarsus of leg I, right, antiaxial view; C – tibia (solenidion except basal part not illustrated) and tarsus of leg IV, right, paraxial view. Scale bar (A) 100 µm, scale bar (B, C) 20 µm.

FIGURE 6: Hammerella (Woasella) huanucoensis Ermilov n. sp.: A – subcapitulum, ventral view, and palptrochanter; B – palp (trochanter not illustrated), left, ventral view; C – chelicera, left, paraxial view. Scale bar (A, C; B) 16 µm.