Zachvatkinibates latilamellatus Bayartogtokh and Aoki, 1998,

Seniczak, Stanisław, Seniczak, Anna, Kaczmarek, Sławomir, Marquardt, Tomasz & Sarsenova, Bibigul, 2020, Morphological ontogeny of Zachvatkinibates latilamellatus (Acari: Oribatida Punctoribatidae), and comments on Zachvatkinibates Shaldybina, Zootaxa 4857 (1), pp. 97-116: 98-103

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Zachvatkinibates latilamellatus Bayartogtokh and Aoki, 1998


Zachvatkinibates latilamellatus Bayartogtokh and Aoki, 1998 

Morphology of adult

Adults investigated herein ( Figs. 1–3aView FIGURE 1View FIGURE 2View FIGURE 3, 4–7View FIGURE 4View FIGURE 5View FIGURE 6View FIGURE 7 a–c) similar to those investigated by Bayartogtokh and Aoki (1998), but see Remarks. Mean length (and range) of females 397.3±12.7 (384–416, n= 12) and males 380.3±11.3 (358–403, n= 18), mean maximum width (and range) of females 246.3±3.5 (238–248) and males 208.7±17.4 (191–234). Pedo- tecum I concave dorsally ( Fig. 3aView FIGURE 3). Hypostomal setae h, m and a short and barbed ( Fig. 2View FIGURE 2). Genal tooth triangular, pointed ( Figs. 3aView FIGURE 3, 7b, 7cView FIGURE 7), cheliceral setae cha longer and thicker than chb, both barbed ( Fig. 3bView FIGURE 3). Palp setae sup, inf and l” on tibia finely barbed, other setae smooth ( Fig. 3cView FIGURE 3), formula of palp seta 0-2-1-3-9(1). Trochanters III and IV and all femora flattened, tarsus I and tibia IV with thickened dorsal integument ( Figs. 5a, 5dView FIGURE 5, 7cView FIGURE 7). Solenidia ω 1 and ω 2 on tarsus I of similar length. Formulae of leg setae [trochanter to tarsus (+ solenidia)]: I—1-5-3(1)-4(2)-20(2); II—1-5-3(1)-4(1)-15(2); III—2-3-1(1)-3(1)-15; IV—1-2-2-3(1)-12. Leg tarsi monodactylous.

Remarks. Our individuals are larger than those investigated by Bayartogtokh and Aoki (1998) —mean length 346 (338–352), mean width 223 (216–226), sex not investigated. The shape and distribution of prodorsal and notogastral setae and porose areas are generally similar as in Bayartogtokh and Aoki (1998).

Diagnosis of juveniles

Juveniles light brown, with two pairs of small, sclerotized depressions on gastronotum of larva (posterolateral to seta c 1, and between setae c 1 and da) and several pairs in nymphs (one pair posterolateral to seta c 1, 3–4 pairs posterior to seta c 1 and 2–3 pairs posteromedial to seta la). Larva with 12 pairs of gastronotal setae, including h 3, all inserted on unsclerotized integument, nymphs with 15 pairs; setae of c -series inserted on individual sclerites, d -, l -, h -series and p 1 on gastronotal shield, and p 2 and p 3 on unsclerotized integument. In all juveniles, porose humeral organ is present.

Description of juveniles

Larva oval in dorsal view ( Fig. 8View FIGURE 8), light brown. Prodorsum subtriangular, prodorsal setae ro and in long, le of medium size ( Table 1), all barbed; seta ex short and smooth. Mutual distance between setal pair le about two times longer than between pair ro, and between setal pair in about four times longer than between pair ro, pair le inserted approximately midway between pairs ro and in. Opening of bothridium rounded, with posterolateral ridge, both- ridial seta clavate, with barbed head.

Gastronotum of larva ( Figs. 8View FIGURE 8, 9aView FIGURE 9, 10aView FIGURE 10) with 12 pairs of setae, including h 3 inserted lateral to anterior part of anal valves; most setae of medium size and barbed, except for short and smooth h 3. Pygidial shield absent, all setae inserted on unsclerotized integument, length of setae of d - and l -series slightly increasing from anterior to posterior ( Table 1). Two small, sclerotized depressions present, posterolateral to seta c 1, and between setae c 1 and da ( Figs. 8View FIGURE 8, 10aView FIGURE 10). Cupule ia posterior to seta c 3, cupule im posterior to seta lm, cupule ip between setae h 1 and h 2, cupule ih lateral to anterior part of anal opening. Opisthonotal gland opening posterolateral to seta lm, without dark sclerotized surrounding. Porose humeral organ small, placed anterior to seta c 3 ( Fig. 10aView FIGURE 10). Paraproctal valves (segment PS) glabrous. Most leg setae barbed, seta ft” relatively long ( Fig. 11View FIGURE 11).

Shape and colour of protonymph, prodorsal setae and bothridium as in larva; gastronotum with 15 pairs of setae (p -series added, Fig. 9bView FIGURE 9), and retained in subsequent nymphs ( Figs. 12a, 12bView FIGURE 12). In all nymphs, gastronotal shield present, with 10 pairs of setae (d -, l -, h -series, p 1), setae p 2 and p 3 inserted on unsclerotized integument; all setae relatively short and smooth. Setae of c -series of medium size and inserted on small individual sclerites, c 3 longer than other setae ( Table 1) and barbed, other setae smooth. In all nymphs, small, sclerotized depressions present on gastronotum, one posterior to seta c 2, 3–4 posterior to seta c 1 and 2–3 posteromedial to seta la ( Figs. 7dView FIGURE 7, 10bView FIGURE 10, 13View FIGURE 13, 14a, 14cView FIGURE 14). In protonymph, one pair of genital setae appearing on genital valves, two pairs added in deutonymph and one pair in tritonymph ( Figs. 9bView FIGURE 9, 12a, 12bView FIGURE 12), all short and smooth. In deutonymph, one pair of aggenital setae and three pairs of adanal setae appear, and remain in subsequent instars; all short and smooth. In protonymph and deutonymph, anal valves glabrous, in tritonymph two pairs of short and smooth anal setae present. In tritonymph, cupules ia and im as in larva, cupule ip between setae h 2 and h 1, cupule iad lateral to anterior part of anal valves, cupules ips and ih displaced posterolateral and anterolateral to iad, respectively ( Figs. 12bView FIGURE 12, 13View FIGURE 13). Humeral organ large, rounded, porose, located anterior to seta c 3, opisthonotal gland opening anteroventral to seta lp, without dark sclerotized surrounding ( Fig. 10bView FIGURE 10). Legs of tritonymph stocky ( Figs. 7dView FIGURE 7, 14View FIGURE 14, 15View FIGURE 15), with shorter barbs on setae pv on tibia II than in adult ( Figs. 5View FIGURE 5, 6View FIGURE 6, 7cView FIGURE 7).

Summary of ontogenetic transformations

In the larva, the prodorsal setae ro and in are longer than seta le, in the nymphs these setae are of similar length, whereas in the adult seta in is longer than ro and le. Seta ex is short in all juveniles, but is of medium size in the adult. The bothridium is rounded in all instars, and in the adult it is covered by anterior tectum of notogaster. In all instars, the bothridial seta is clavate, with barbed head, but in the larva and adult the head is thicker than in the nymphs. The larva has 12 pairs of gastronotal setae, including h 3, the nymphs have 15 pairs (p -series appearing in the protonymph). The notogaster of adult loses five pairs of setae (c 1, c 3 and d -series), such that 10 pairs of notogastral setae remain. The formula of gastronotal setae in Z. latilamellatus  is 12-15-15-15-10 (from larva to adult), the formula of epimeral setae are 3-1-2 (larva, including scaliform 1c), 3-1-2-1 (protonymph), 3-1-2-2 (deutonymph) and 3-1-3-3 (tritonymph and adult). The formula of genital setae is 1-3-4-6 (protonymph to adult), and formula of aggenital setae is 1-1-1 (deutonymph to adult), and setal formula of segments PS-AN is 03333-0333-022. The ontogeny of leg setae and solenidia of Z. latilamellatus  is shown in Table 2.