Microzetes (Microzetes) samarensis, Ermilov & Corpuz-Raros, 2016

Ermilov, S. G. & Corpuz-Raros, L., 2016, Contribution to the knowledge of the oribatid mite genus Microzetes (Acari, Oribatida, Microzetidae), Acarologia 56 (4), pp. 573-585 : 575-579

Microzetes (Microzetes) samarensis n. sp.

( Figures 1 – 3)

Diagnosis — Body size: 225 – 250 × 147 – 168. Generally, body surface smooth, granular bands absent on notogaster. Rostrum rounded. Longitudinal ridge and one pair of triangular lobed structures present near to rostrum. Lamellae distally with outer teeth, rounded and convex medial parts and indentation between them. Inner margins of lamellae separated by pentagonal gap above interlamellar region and connected by translamella basally. Rostral setae flagellate, slightly barbed. Lamellar setae thorn-like, smooth. Interlamellar setae thin, smooth. Bothridial setae long, setiform, ciliate unilaterally in medio-distal parts. Pteromorphs small, rounded. Epimeral setae setiform, smooth, 1a, 1c and 2a shorter than other setae. Sejugal epimeral borders fused medially and with borders of apodemes IV, forming X-structure. Anogenital setae minute, thin, smooth (except longer g 1).

Measurements — Body length: 225 (holotype: male), 225 (paratype: male), 250 (paratype: female); notogaster width 155 (holotype), 147 and 168 (paratypes, male and female, accordingly).

Integument — Body color light brownish to brown. General body surface smooth, lateral sides with slight microgranular cerotegument. Pteromorphs with indistinct striae.

Prodorsum ( Figs 1A, 2A ) — Rostrum rounded. Longitudinal ridge (r) developed, short. One pair of lobed structures present near to rostrum, small, triangular, directed upward. Distal parts of lamellae with strong outer teeth (length 24 – 28), rounded and convex medial parts and deep indentation between them. Inner margins of lamellae separated by pentagonal gap above interlamellar region and connected by thick translamella basally. Interlamellar region trapezoid. Rostral setae (ro, 36) flagellate, slightly barbed, inserted on tubercles. Lamellar setae (le, 32 – 36) thorn-like, smooth. Interlamellar setae (in, 4) thin, smooth. Bothridial setae (bs, 114 – 123) longer than half of notogaster length, setiform, ciliate unilaterally in medio-distal parts. Exobothridial setae (ex, 12) thin, straight, smooth. Tutoria (tu) with long knife-like cusps.

Notogaster ( Figs 1A – B, 2A ) — Anterior margin developed. Pteromorphs small, rounded. Posterolateral parts with slightly developed longitudinal furrows (f). Nine pairs of notogastral setae setiform, smooth, p 1 and p 2 (6) shorter than other setae (12). Setae lm, lp, h 1 and h 2 located in two longitudinal, parallel rows. Only lyrifissures im distinct, ia, ip, ih and ips not visible. Opisthonotal gland openings (gla) located posteriorly to im.

Gnathosoma ( Figs 2B – D ) — Generally, morphology is typical for Microzetidae ( Grandjean 1936; Engelbrecht 1972; Ermilov et al. 2013). Subcapitulum slightly longer than wide (57 – 65 × 53 – 61). Subcapitular setae (h, m, a) setiform, barbed, similar in length (16). Two pairs of adoral setae (or 1, or 2) minute (4), thin, smooth. Palps (53) with nine setae and one solenidion (+ω) on palptarsi. Chelicerae (61 – 65) with two setiform setae: cha (20 – 24) ciliate unilaterally, chb shorter (16), barbed. Cheliceral tubercles (6 – 8) thorn-like, blunt-ended.

Epimeral and lateral podosomal regions ( Figs 1B, 2A ) — Epimeral setae setiform, smooth, 1a, 1c and 2a (6) shorter than other setae (10 – 12). Setae 3c inserted on pedotecta II; setae 4c inserted posteriorly to discidia. Sejugal epimeral borders fused medially and with borders of apodemes IV, forming X-structure. Discidia (dis) large, triangular, rounded distally. Circumpedal carinae (cp) long, strong.

Anogenital region ( Figs 1B, 2A ) — Six pairs of genital (g 1, 10 – 12; g 2 – g 6, 4 – 6), one pair of aggenital (ag, 4 – 6), two pairs of anal (an 1, an 2, 4 – 6) and three pairs of adanal (ad 1 – ad 3, 4 – 6) setae minute, thin, smooth. Adanal lyrifissures (iad) distinct.

Legs ( Figs 3A – E) — Generally, morphology is typical for Microzetidae ( Grandjean 1936; Engelbrecht 1972; Ermilov et al. 2013). Claw of each leg smooth. Formulas of leg setation and solenidia: I (1-5-3-4-18) [1-2-2], II (1-5-3-4-15) [1-1-2], III (2-3-1-3-15) [1-1-0], IV (1-2-2-3-12) [0-1-0]; homology indicated in Table 1. Setae p setiform on tarsi I, thorn-like on tarsi II – IV. Famulus () short, setiform, blunt-ended. Solenidia ω 1 on tarsi I, ω 1 and ω 2 on tarsi II, ’ 2 on tibiae I and σ on genua II and III thick, blunt-ended, other solenidia longer, setiform, pointed. Solenidia ω 2 on tarsi I pressed to surface of tarsi.

Type deposition — The holotype is deposited in the collection of the Senckenberg Institution , Görlitz, Germany ; two paratypes are deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia .

Etymology — The specific name samarensis refers to the Philippine Island, Samar, where the new species was collected.

Remarks — Microzetes (Microzetes) samarensis n. sp. differs from other species of the subgenus by the insertions of notogastral setae c and la (close to each other vs. distanced in the other species). Additional distinctive characters of the new species from other Microzetes -species can be found in the identification key given below.

Figures

FIGURE 2: Microzetes (Microzetes) samarensis n. sp.: A – lateral view, right side (gnathosoma and legs not illustrated); B – subcapitulum, ventral view; C – palptarsus, right, antiaxial view; D – anterior part of chelicera, left, paraxial view. Scale bar (A) 50 µm, scale bar (B – D) 20 µm.