Jacotella puyuma, Ermilov & Liao, 2021

Ermilov, Sergey G. & Liao, Jhih-Rong, 2021, New faunistical and taxonomic data on oribatid mites (Acari: Oribatida) of Taiwan, Acarologia 61 (2), pp. 297-320 : 303-308

Jacotella puyuma n. sp.

Zoobank: 68246793-3547-4AC3-87E7-EB9938BE528F

(Figures 5–9)

Diagnosis — Adult. Body size: 365–415 × 182–215. Body surface microsculptured, covered by tubercular and bacillar cerotegument and band-like structures between them, forming microreticulate ornament. Anterior prodorsal part with large depression. Bothridial seta long, with elongate flattened head covered by dense small scales. Anterior notogastral part with transverse ridge, centrodorsal notogastral part with two longitudinal ridges, each with two lateral transverse branches, posteriorly fused. Four pairs of setiform, roughened setae developed, h 1 long, p 1 of medium length, p 2 and p 3 short; h 1 and p 1 inserting on strong tubercles. All epimeral and anogenital setae short, setiform, roughened. Leg femora with saccule. Tritonymph. Bothridial seta and gastronotic seta h 1 long, with elongate flattened head covered by dense small scales. Gastronotic seta c 3 very long, setiform, densely barbed; other setae comparatively short, narrowly phylliform.

See Table 1 for explanations. * – Setae l” on tarsi I and II and seta v’ on tarsus I absent in tritonymph (versus present in adult).

and adoral (8) setiform, slightly barbed. Palp (45–49) with setation 0-2-1-3-9(+ω). Postpalpal seta (2) spiniform, smooth. Chelicera (73–77) with two setiform, barbed setae (cha, 24–26;

chb, 16–18). Trägårdh’s organ not observed.

Epimeral and lateral podosomal regions (Figs 5b, 7b, 7c) – Epimeral setal formula 3-1-3-3.

All epimeral setae (4c, 16–20; others 10–12) setiform, roughened. Tubercles of parastigmatic enantiophysis not observed. Discidium elongate triangular.

Anogenital region (Figs 5b, 7b, 7c, 7e) – Genital, aggenital, anal (all 10–12), and adanal (16–20) setae setiform, roughened. Adanal lyrifissure not observed.

Legs ( Figs 6 d-g, 7c, 8b-e) – Heterotridactylous; claws smooth. Tibia I with dorsodistal cylindrical apophysis bearing two solenidia and seta. All femora with saccule (instead porose area). Formulas of leg setation and solenidia: I (1-5-4-5-20) [1-2-2], II (1-5-4-5-16) [1-1-2],

III (2-3-3-4-15) [1-1-0], IV (1-2-3-4-12) [0-1-0]; homology of setae and solenidia indicated in Table 2. Famulus on tarsus I sunken in cup-like cuticular deepening. Solenidion 1 φon tibia I setiform, other solenidia thickened, rounded apically.

Description of tritonymph — Measurements – Body length: 348 (one tritonymph); gastronotum width: 199 (one tritonymph).

Integument – Body color grey yellowish. Body and legs covered by thick cerotegumental layer represented by tubercular and bacillar structures (length up to 2). Gastronotum (except dorsocentral part), ventral side of body and lateral side of prodorsum folded. Setae with or without cerotegument. Exuviae with reticulate ornamentation.

Prodorsum (Fig. 9a) – About 1/2 length of gastronotum. Rostrum rounded. Dorsal part with one pair of longitudinal, slightly divergent carinae. Enantiophysis not developed. Rostral (41) and lamellar (36) setae setiform, roughened. Interlamellar seta (4) spiniform, smooth. Bothridial seta (102) with long stalk and elongate flattened head covered by dense small scales. Exobothridial seta (10) setiform, roughened.

Gastronotic region (Fig. 9a) – Gastronotum carrying scalps of previous instars, with four strong posterior apophyses bearing setae h 1 and p 1. Ten pairs of gastronotic setae present: seta

h 1 (102) with long stalk and elongate flattened head covered by dense small scales; seta c 3 (131) setiform, densely barbed; other setae c 1 (, 16; others 20–24) narrowly phylliform (except c 2, p 2 and p 3 broken). Opisthonotal gland opening and all cupules slightly visible. Larval exuvium with nine, proto- and deutonymphal exuviae with seven pairs of setae, all narrowly phylliform (except broken c 2 and dp in larva and broken c 2 and h 1 in proto- and deutonymph).

Gnathosoma (Fig. 9b) – Mostly similar to adult. Subcapitulum size: 73 × 53. Subcapitular (12) and adoral (6) setae setiform, roughened. Palp (65) with setation 0-2-1-3-9(+ω). Postpalpal seta (2) spiniform, smooth. Chelicera (69) with two setiform, barbed setae cha (, 24; chb, 16).

Epimeral and lateral podosomal regions (Fig. 9b) – Epimeral setal formula 3-1-3-3. All epimeral setae (12–16) setiform, roughened.

Anogenital region (Fig. 9b) – Genital, aggenital, anal, and adanal (all 10–12) setae setiform, roughened. Adanal cupule slightly visible.

Legs – Mostly similar to adult. Single claw of each leg strong, smooth. Saccule and porose area on segments not observed. Formulas of leg setation and solenidia: I (1-5-4-5-18) [1-2-2],

Figures

Figure 6 Jacotella puyuman. sp., adult: a – subcapitulum, ventral view; b – palp, left, paraxial view; c – chelicera, right, antiaxial view; d – leg I, without trochanter, right, antiaxial view; e – leg II, without trochanter and tarsus, right, ventroantiaxial view; f – leg III, without tarsus, left, ventroantiaxial view; g – leg IV, left, antiaxial view. Scale bar 20 μm (a, c-g), 10 μm (b).