Piribelba rossica
Creators: name: Miko, Ladislav
name: Kolesnikov, Vasiliy B.
name: Ermilov, Sergey G.
name: Klimov, Pavel B.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Arachnida
Sarcoptiformes
Damaeidae
Piribelba
Piribelba rossica

description: Piribelba rossica (Bulanova-Zachvatkina, 1957)
Belba rossica Bulanova-Zachvatkina, 1957: 1170 (“ Belba rossica, sp. n. ”, with a single diagnostic character reported (the absence of proterosomal tubercles); an available name under ICZN Articles 11 and 13.1; types not designated, distribution not reported); Bulanova-Zachvatkina, 1962: 215, Figs 4.4, 4.5 (holotype not designated; distribution: European part of the [former] USSR, Siberia, Russian Far East); Bulanova-Zachvatkina, 1967: 19 (indication that the original type series was from the Moscow region).
Piribelba rossica: Miko, 2021: 1583 (designated as type of Piribelba Miko, 2021).
Adult (Figs 1–9)
Measurements. Body length 690–790; length of notogaster 560–620; maximum notogastral width 380–420.
Integument (Figs 1A–F, 3A–F, 4A–D, 5A, B, D–G, 6A–H, 7A–E, 8B, C, F, 9B–E, G, I, J). Reddish-brown to deep reddish brown in colour. Body surface microtuberculate, microtubercles most conspicuous on all enantiophyses, lateral part of podosoma and around leg acetabula. Surface of dorsal and ventral sides of body and leg segments with very thick reticulated cerotegument (Figs 1A–C, 3A–F, 4A–D, 5A, B, D–G, 6A–H, 7A–E, 9B–E, G, I, J). Notogaster of all specimens with exuvial scalps – in young specimens, it is often only thin nymphal skins, older specimens have a thick layer of dirt and debris (Fig. 8H); leg segments with loosely attached adherent debris.
Prodorsum (Figs 1A, C, 2G, 4A–C, 5A, B, 6A, C, D, E, G, 8G–J, 9G, H). Rostrum slightly tapers in front. Propodolateral apophyses absent. Dorsosejugal areas with rounded short ridges in place of tubercles Ba (sejugal costulae, scos), in dorsal view partly over-covered by anterior edge of notogaster and sometimes difficult to observe, prodorsal tubercles absent. Parastigmatic apophyses Sa well developed, long, elongate triangular in shape and conspicuously pointed distally, Sp relatively small, rounded at tip. Anterobothridial ridges (abr) distinct. Costulae (cos) present, distally curved. Rostral setae (ro) of medium length, 73–88, thin and smooth. Lamellar setae (le) longer and distinctly thicker than rostral ones, 96–106, from dorsal view with rare dark small spines or scales on majority of its length (often they very rare and hardly visible) (Figs 8G–J). Interlamellar setae (in, 51–63) thick, blunt, very bumpy at the top. Exobothridial setae (ex, 40–55) thick, strongly bumpy, curved. Bothridial setae (bs, 222–305) slightly tuberous at the apex, with flagellate tip in young specimens, in old specimens often with a broken off top. Distinct fields of sigillae (muscle insertions) present on prodorsum, two anteriad – anteriomediad to bothridia and in, one in interbothridial area.
Notogaster (Figs 1A, C; 2H, 4A–D, 5B, D, E, 6A–C, H, 8A–F, 9D, C, I–K). Notogaster irregularly oval, distinctly narrowed anteriorly. Broadest part of notogaster positioned slightly behind half of notogaster, anterior margin of notogaster covering dorsosejugal area in dorsal view. Notogastral setae c 1 (91–101) and c 2 (103–120) thin, hairy, slightly curved, directed forward; la, lm, lp short (62–99), noticeably curved; h 1, h 2, h 3 (53–67) thicker, strongly curved; p 1, p 2, p 3 shorter (43–50) than others, thick, curved, poorly visible in dorsal aspect. All notogastral setae slightly tuberous, with cerotegument. Setae la, lm, lp, h 1, h 2, h 3 often have one or two distal spines (Figs 2H, 8B, C, E). Distance c 1 – c 1 shorter than c 2 – c 2. A few microtubercles found between bases of setae c 1 and c 2. All lyrifissures (ia, im, ip, ih, ips) and opisthonotal gland openings distinct. Circumgastric row of muscle sigillae distinct, well visible; numerous muscle sigillae found anterior and posterior margins of notogaster.
Gnathosoma (Figs 2D–F, 5C). Subcapitulum longer than wide (151–168 × 100–108). Subcapitular setae (a, m, h) similar in length (38–53), setiform, barbed. Adoral setae (13–15) setiform, thin, smooth. Palps (145–148) with setation 0-2-1-3-9(+ω); solenidion of palptarsi bacilliform, pressed to palptarsal surface mediodistally. Postpalpal setae (10–11) spiniform. Chelicerae (135–157) of shape and relative size as usual in Damaeidae, seta cha (42–45) with extended proximal part, bent outwards proximally and inwards distally, with short barbs on external curvature and attenuated tip, seta chb (30–33) straight, distally bent and with fringe of diminishing barbs. Trägårdh’s organ (32–35) elongate triangular.
Epimeral and lateral podosomal regions (Figs 1B, C, 2A, B, 5A, B, 6C, D, 9B). Ventral tubercles absent. Epimeral setal formula variable: 3-1-3-4 or 3-1-4-4, or 3-1-3-5; left and right sides can differ in their formulas. Setae 1a, 1b, 1c, 2a, 3a, 3b, 3c, 3d, 4b situated on distinctly developed microtubercles. Epimeral setae comparatively long, smooth, strong, with attenuate tips, setae 4a, 4c, 4d slightly thinner than other epimeral setae. Epimeres with muscular sigillae, well visible, particularly closer to axial part. Discidia (dis) poorly developed, rounded at tip and projecting slightly laterally, poorly distinguishable in the lateral aspect.
Anogenital region (Figs 1B–F, 5A, 6B, C, 9B). Six pairs of genital (g 1 – g 6, 30–54), one pair of aggenital (ag, 66– 70), two pairs of anal (an 1, an 2, 34–38), and three pairs of adanal (ad 1 – ad 3, 48–58) setae. Aggenital and adanal setae smooth, strong, subequal in length, similar to epimeral setae. Distance ad 3 – ad 3 longer than ad 2 – ad 2. Posteromedian part of genital plates with a few microtubercles; insertions of genital setae may be connected to one another by sclerotized longitudinal ridges; anal plates with a sclerotized longitudinal ridge on each. Genital setae g 1 distinctly longer (48–54) than others and nearly as long as adanal setae; anal setae similar in length to g 2 – g 6. Adanal lyrifissures (iad) apoanal – oblique and divergent from body axis posteriad. Anal lyrifissures (ian) present (Fig. 1F).
Legs (Figs 3A–F, 5G, 7A–E, 9E). All legs moderately long, segments with distinctly swollen distal parts (moniliform), except tarsi, where swollen part is proximal. Legs IV slightly longer than body, legs I and III slightly shorter than body, legs II distinctly shorter than body (Table 1). All setae of trochanters, femora, genua, and tibiae (except v), and ft of tarsi strong, darkly pigmented, and mostly with very short barbs. Ventral setae of tibiae and rest setae of tarsi comparatively long and thin, pointed, smooth or slightly barbed. Formulas of leg setation and solenidia: I (1-7-4-4-20) [1-2-2], II (1-7-4-5-17) [1-1-2], III (2-5-3-4-17) [1–1–0], IV (2-5-3-4-14) [0-1-0]; homologies of setae and solenidia indicated in Table 2. Famulus of tarsi I normal, setiform, emergent, relatively long. Solenidia of genua I, II and III each coupled with companion setae d, as well as solenidia of tibiae II–IV. Length of solenidia on genua I–III and on tibiae II, III subequal to length of companion setae, tibial solenidia IV longer than respective companion setae.
Larva (Figs 10, 11, 18A–C)
Measurements. Body length 275–300; body width 150–170.
Integument (Figs 10). Body oval, rounded posteriorly, weakly sclerotized. Body cuticle white-coloured. Cuticle of body and legs smooth, covered with thin layer of granular cerotegument. Round or oval granules small, up to 1–1.4 μm. Prodorsal and gastronotic setae (excluding ro, le, bs) without cerotegument.
Prodorsum (Figs 10A, C) triangular, rostrum rounded. Setae strongly or weakly dark-coloured, inserted on small apophyses. Rostral (ro, 25–28) and lamellar (le, 28–30) setae strong, tapering at the end, barbed. Interlamellar setae (in, 18–20) thick, sharply pointed at the top, slightly barbed. Exobothridial setae (ex, 4–5) minute, smooth. Bothridial setae (bs, 166–180) flagellate, smooth.
Gastronotum (Figs 10). Twelve pairs of gastronotic setae. Setae dark-coloured (except c 1 and c 3), inserted on apophyses (except c 3 and h 3). Setae c 1 (19–24) thin, light-coloured, smooth, inserted on separate small apophyses. Setae la, lm (19–25), h 1 (23–27), h 2 (22–24), da (37–40), dm (60–67) barbed, flagellate. Setae dp (180–195) longest, barbed, with long, thin tips. Setae lp (6–7) short, smooth, blunt. Setae c 3 and h 3 minute (3–4). Apophyses of setae dp located close to each other, connected. Cupules ia after to setae c 3, im ventral to setae lm, ih close to anal valves, ip between setae h 2 and h 3. Small apertures of opisthonotal glands (gla) visible lateral to setae h 3.
Epimeral region (Figs 10B, C). Epimeral formula: 2-1-2 (except protective scale over Claparède’s organ). Epimeral setae short, smooth. Apodemes ap2, apsj porose.
Gnathosoma (Figs 18A–C). Subcapitulum slightly longer than wide (70–75 × 66–71). Subcapitular setae (a, m, h, 22–25) setiform, barbed. Adoral setae (5–6) setiform, thin, smooth. Palps (77–84) with setation 0-1-1-3-9(+ω); seta v ʺ absent. All setae barbed (except on palptarsi). Solenidion of palptarsi bacilliform, pressed to palptarsal surface. Postpalpal setae (5) spiniform, smooth. Chelicerae (85–89) with two long, barbed setae (cha, 20–23; chb, 18–20), chb with long barbs in middistal part.
Legs (Figs 11). All legs shorter than body (Table 1). Tarsi and femora elongated, the longest among segments. Claws smooth. Most setae short, thick, heavily barbed, setae of tarsi setiform (except ft). Formulas of leg setation and solenidia: I (0-2-3-4-16) [1-1-1], II (0-2-3-3-13) [1-1-1], III (0-2-2-3-13) [1-1-0]; homologies of setae and solenidia indicated in Table 2. Famulus of tarsi I normal, setiform, emergent, relatively long. Solenidia of genua I–III each coupled with companion setae d, as well as solenidia of tibiae I–III. Solenidia σ pressed to the surface of genua, setae d on genua minute. Setae d about one eighth length of φ 1 on tibiae I. Setae d on tibiae II, III strong, barbed, subequal to length of companion solenidia.
Protonymph (Figs 12, 13, 18D–F)
Measurements. Body length 330–364; body width 192–200.
Integument (Figs 12). Body oval, rounded posteriorly, weakly sclerotized. Body cuticle white-coloured. Cuticle of body and legs smooth, covered with thin layer of granular cerotegument. Round or oval granules small, up to 2–2.5 μm. Prodorsal and gastronotic setae (excluding ro, le, bs) without cerotegument.
Prodorsum (Figs 12A, C) triangular, rostrum rounded. Curved cuticle thickenings are located laterally on the prodorsum, distal to the bothridia. Setae strongly or weakly dark-coloured, inserted on small apophyses. Rostral (34–37) and lamellar (38–42) setae strong, tapering at the end, barbed. Interlamellar setae (17–22) thick, sharply pointed at the top, smooth. Exobothridial setae (10) smooth. Bothridial setae (180–210) flagellate, smooth.
Gastronotum (Figs 10). Twelve pairs of gastronotic setae. Setae dark-coloured (except c 3), inserted on apophyses. Setae c 1 (50–54), c 2 (74–80), la (56–60), lm (67–71), lp (48–51), h 3 (68–70), h 2 (35–37) barbed, flagellate. Setae h 1 (194–203) longest, barbed, with long, thin tips. Setae p 1 (19–21) short, slightly barbed. Setae c 3 (7–8), p 2, p 3 (9–11) short, smooth. Apophyses of setae c 1 separated, setae h 1 located close to each other, connected. Cupules ia after to setae c 3, im ventral to setae lm, ips close to anal valves, ih located above setae p 3, ip near setae h 2 and h 3. Small apertures of opisthonotal glands visible lateral to setae p 2 and p 3. Genital valves appear, with one pair of setae. Gastronotic region covered with particles of dirt (not covered with larval exuvium). Cornicle (k) poorly developed.
Epimeral region (Figs 12B, C). Epimeral formula: 3-1-2-1. Epimeral setae short, smooth. Apodemes ap2, apsj, ap3 porose.
Gnathosoma (Figs 18D–F). Subcapitulum longer than wide (90–95 × 70–76). Subcapitular setae (a, m, 24–27; h, 15–17) setiform, barbed (setae h smooth). Adoral setae (8–9) setiform, thin, smooth. Palps (90–100) with setation 0-2-1-3-9(+ω). All setae barbed (except on palptarsi). Solenidion of palptarsi bacilliform, pressed to palptarsal surface. Postpalpal setae (6–7) spiniform, smooth. Chelicerae (104–108) with two long, barbed setae (cha, 29–31; chb, 23–25), chb with long barbs in middistal part.
Legs (Figs 13). All legs shorter than body (Table 1). Tarsi and femora elongated, the longest among segments. Claws smooth. Most setae of legs short, thick, heavily barbed, setae of tarsi setiform (except ft). Formulas of leg setation and solenidia: I (0-2-3-4-16) [1-1-2], II (0-2-3-3-13) [1-1-1], III (1-2-2-3-13) [1-1-0], IV (0-0-0-0-7) [0-0- 0]; homologies of setae and solenidia indicated in Table 2. Famulus of tarsi I normal, setiform, emergent, relatively long. Solenidia of genua I–III each coupled with companion setae d, as well as solenidia of tibiae I–III. Setae d about more one tenth length of φ 1 on tibiae I, smooth. Setae d on tibiae II, III and on genua I–III strong, barbed, subequal to length of companion solenidia.
Deutonymph (Figs 14, 15, 18G–I, 19F, G)
Measurements. Body length 425–450; body width 250–270.
Integument (Figs 14). Body oval, rounded posteriorly, weakly sclerotized. Body cuticle white-coloured. Cuticle of body and legs smooth, covered with thin layer of granular cerotegument. Round or oval granules small, up to 1.5–2.8 μm. Prodorsal and gastronotic setae (excluding ro, le, bs) without cerotegument.
Prodorsum (Figs 14A, C) triangular, rostrum rounded. Curved cuticle thickenings are located laterally on the prodorsum, distal to the bothridia. Setae strongly or weakly dark-coloured, inserted on small apophyses. Rostral (38–41) and lamellar (39–44) setae strong, tapering at the end, barbed. Interlamellar setae (19–21) thick, sharply pointed at the top, smooth. Exobothridial setae (14–15) smooth. Bothridial setae (195–220) flagellate, smooth.
Gastronotum (Figs 14). Twelve pairs of gastronotic setae. Setae dark-coloured (except c 3), inserted on apophyses. Setae c 1 (102–110), c 2 (140–150), la (68–73), lm (105–108), lp (90–93), h 3 (85–90), h 2 (64–67), p 1 (45–47) barbed, flagellate. Setae h 1 (230–247) longest, barbed, with long, thin tips. Setae c 3 (19–20), p 2, p 3 (14–17) short, smooth. Apophyses of setae c 1 separated, setae h 1 located close to each other, connected. Three pairs of genital (g, 12–14), one pair of aggenital (ag, 11–12) and three pairs of adanal (ad 1 – ad 3, 7–11) setae setiform. Some specimens show tiny anal setae. Cupules ia after to setae c 3, im ventral to setae lm, ih and ips located above setae p 3, ip near setae h 2 and p 2, iad close to anal valves. Small apertures of opisthonotal glands (gla) visible lateral to setae p 2 and p 3. Gastronotic region covered with protonymphal exuvium and particles of dirt. Cornicle (k) developed, conical, between setae la.
Epimeral region (Figs 14B, C). Epimeral formula: 3-1-2-2. Epimeral setae short, smooth. Apodemes ap2, apsj, ap3 porose.
Gnathosoma (Figs 18G–I). Subcapitulum longer than wide (120–130 × 105–110). Subcapitular setae (a, 37–41; m, 48–50; h, 21–24) setiform, barbed (setae h smooth). Adoral setae (9–11) setiform, thin, smooth. Palps (109–113) with setation 0-2-1-3-9(+ω). All setae barbed (except on palptarsi). Solenidion of palptarsi bacilliform, pressed to palptarsal surface. Postpalpal setae (10) spiniform, smooth. Chelicerae (120–124) with two long, barbed setae (cha, 34–37; chb, 25–27), chb with long barbs in middistal part.
Legs (Figs 13, 19F, G). All legs shorter than body (Table 1). Tarsi and femora elongated, the longest among segments. Claws smooth. Most setae of legs short, thick, heavily barbed, setae of tarsi setiform (except ft). Formulas of leg setation and solenidia: I (1-4-4-5-16) [1-2-2], II (1-4-4-4-13) [1-1-2], III (2-3-3-4-13) [1-1-0], IV (1-2-2-3- 12) [0-1-0]; homologies of setae and solenidia indicated in Table 2. Famulus of tarsi I normal, setiform, emergent, relatively long. Solenidia of genua I–III each coupled with companion setae d, as well as solenidia of tibiae I–IV. Setae d about more one tenth length of φ 1 on tibiae I, smooth. Setae d on tibiae II, III and on genua I–III strong, barbed, subequal to length of companion solenidia. Solenidia φ on tibiae IV longer than respective companion setae.
Tritonymph (Figs 16, 17, 18J–L, 19A–E)
Measurements. Body length 650–720; body width 380–410.
Integument (Figs 14). Body oval, rounded posteriorly, weakly sclerotized. Body cuticle white-coloured. Cuticle of body and legs partly smooth (gastronotum) and partly covered with fine pits (prodorsum). Body covered with thin layer of granular cerotegument. Round or oval cerotegument granules small, up to 1–3 μm. Prodorsal and gastronotic setae (excluding ro, le, bs) without cerotegument.
Prodorsum (Figs 16A, C, 19E) triangular, rostrum rounded. Curved cuticle thickenings are located laterally on the prodorsum, distal to the bothridia. Setae strongly or weakly dark-coloured, inserted on small apophyses. Rostral (52–55) and lamellar (54–58) setae strong, tapering at the end, barbed. Interlamellar setae (28–31) thick, sharply pointed at the top, smooth. Exobothridial setae (26–28) smooth. Bothridial setae (250–270) flagellate, smooth.
Gastronotum (Figs 16). Twelve pairs of gastronotic setae. Setae dark-coloured, inserted on apophyses. Setae c 1 (120–137), c 2 (138–160), la (120–125), lm (160–170), lp (182–193), h 3 (170–180), h 2 (100–112), p 1 (85–90) barbed, flagellate. Setae h 1 (280–290) longest, barbed, with long, thin tips. Setae c 3 (34–37), p 2, p 3 (17–20) short, smooth. Apophyses of setae c 1 separated, setae h 1 located close to each other, connected. Five pairs of genital (g, 15–17), one pair of aggenital (ag, 14–16), two pairs of anal (an, 13–15), and three pairs of adanal (ad 1 – ad 3, 18–22) and setae setiform. Cupules ia after to setae c 3, im ventral to setae lm, ih and ips located above setae p 3, ip near setae h 2 and p 2, iad close to anal valves. Small apertures of opisthonotal glands (gla) visible lateral to setae p 2 and p 3. Gastronotic region covered with protonymph and deutonymph exuvia and particles of dirt. Cornicle (k) developed, conical, between setae la.
Epimeral region (Figs 16B, C). Epimeral formula: 3-1-3-3. Epimeral setae short, smooth. Apodemes ap2, apsj, ap3 porose (Figs 19A–D).
Gnathosoma (Figs 18J–L). Subcapitulum longer than wide (148–158 × 130–138). Subcapitular setae (a, 44–50; m, 50–58; h, 36–40) setiform, barbed (setae h smooth). Adoral setae (12–16) setiform, thin, smooth. Palps (120– 130) with setation 0-2-1-3-9(+ω). All setae barbed (except on palptarsi). Solenidion of palptarsi bacilliform, pressed to palptarsal surface. Postpalpal setae (8–10) spiniform, smooth. Chelicerae (130–136) with two long, barbed setae (cha, 36–40; chb, 30–33), chb with long barbs in middistal part.
Legs (Figs 13). All legs shorter than body (Table 1). Tarsi and femora elongated, the longest among segments. Claws smooth. Most setae of legs short, thick, heavily barbed, setae of tarsi setiform (except ft). Formulas of leg setation and solenidia: I (1-5-4-5-18) [1-2-2], II (1-5-4-5-15) [1-1-2], III (2-3-3-4-15) [1-1-0], IV (2-3-3-4-12) [0-1- 0]; homologies of setae and solenidia indicated in Table 2. Famulus of tarsi I normal, setiform, emergent, relatively long. Solenidia of genua I–III each coupled with companion setae d, as well as solenidia of tibiae I–IV. Setae d about more one sixth length of φ 1 on tibiae I, smooth. Setae d on tibiae II, III and on genua I–III strong, barbed, subequal to length of companion solenidia. Solenidia φ on tibiae IV longer than respective companion setae.
description: Published as part of Miko, Ladislav, Kolesnikov, Vasiliy B., Ermilov, Sergey G. & Klimov, Pavel B., 2022, Taxonomy of European Damaeidae (Acari, Oribatida) XI. European species of the genus Piribelba Miko 2021: redescriptions of P. rossica (Bulanova-Zachvatkina 1957) and P. piriformis (Mihelčič, 1964) using morphology and DNA sequence data, pp. 169-210 in Zootaxa 5187 (1) on pages 172-192, DOI: 10.11646/zootaxa.5187.1.11, http://zenodo.org/record/7078021