Galumnella paraokinawana, Ermilov & Khaustov, 2019

Ermilov, Sergey G. & Khaustov, Alexander A., 2019, New Galumnoidea (Acari, Oribatida) from Tanzania, Zootaxa 4545 (4), pp. 531-547 : 534-545

Galumnella paraokinawana sp. nov.

( Figs 26–37 , 43–45 )

Diagnosis. Body size: 249–282 × 182–215. Body surface foveolate, central part of notogaster and region between genital and anal apertures reticulate. Lamellar lines present, sublamellar lines absent. Rostral, lamellar and interlamellar setae short, thin, smooth, ro longest. Bothridial setae long, with unilaterally dilated head, barbed. Median pore absent. Notogastral, epimeral and anogenital setae short, thin, smooth. Epimeral setal formula: 1–0–2–3. Postanal porose area oval.

Description. Measurements. Body length: 265 (holotype), 249–282 (eight paratypes); notogaster width: 199 (holotype), 182–215 (eight paratypes). Females larger than males: 282 × 199–215 versus 249–265 × 182–199.

Integument ( Figs 43, 44 ). Body color dark brown. Body surface (including subcapitular mentum and genital and anal plates) densely foveolate (diameter of foveoles up to 4). In addition, central part of notogaster and region between genital and anal apertures reticulate.

Prodorsum ( Figs 26, 27 , 31 ). Rostrum rounded. Lamellar lines thin, curving backwards at ventral end. Sublamellar lines absent. Prodorsal leg niches and lateral ridges of prodorsum poorly developed. Rostral (12), lamellar (6) and interlamellar (4) setae setiform, thin, smooth. Insertions of lamellar setae located close and lateral to lamellar lines. Bothridial setae (57–69) with unilaterally dilated head barbed distally. Exobothridial setae and their alveoli absent. Sejugal porose areas not evident. Dorsophragmata rounded.

Notogaster ( Figs 26 , 31–33 ). Dorsosejugal suture present, simple. With 10 pairs of setiform, thin, smooth setae (4). Median pore absent. All lyrifissures distinct, im located posterolateral to lm, ip between p 1 and h 1, ih and ips close to each other, anterolateral to h 2. Opisthonotal gland openings located posterolateral to h 2. One pair of lateral pores poorly visible. Circumgastric sigillar band indistinct.

Gnathosoma ( Figs 28–30 ). Subcapitulum size: 65–69 × 41–49. Subcapitular setae setiform, smooth, a (16) longer than m (6) and h (2–4); a thickest, h thinnest. Adoral setae not evident. Length of palps 61–65. Postpalpal setae (4) spiniform, smooth. Length of chelicerae 86–90. Cheliceral setae represented by alveoli. Trägårdh’s organ of chelicerae very long, tapered.

Epimeral and lateral podosomal regions ( Figs 27 , 31 ). Anterior tectum of epimere I smooth. Pedotecta I broadly rounded, pedotecta II narrowly rounded in ventral view. Discidia triangular. Epimeral setal formula: 3–0–2–3. Epimeral setae (3c, 10; others 4) setiform, thin, smooth. Circumpedal carinae long, directed to epimere I.

Anogenital region ( Figs 27 , 31–33 ). Six pairs of genital, one pair of aggenital, two pairs of anal and three pairs of adanal setae similar in length (4), setiform, thin, smooth. Anterior edge of genital plates with three setae. Aggenital setae located closer to genital plates than to anal plates. Adanal lyrifissures located close and anterior to anal plates. Adanal setae ad 1 posterior, ad 2 posterolateral, ad 3 lateral to anal aperture. Distance ad 1 – ad 2 equal to ad 2 – ad 3. Postanal porose area oval (4–6 × 2). One pair of longitudinal furrows located lateral to genitoaggenital region.

Legs ( Figs 34–37 , 45 ). Monodactylous, claw of tarsi strong, smooth. Porose areas on all femora and on trochanters III, IV poorly visible. Formulas of leg setation and solenidia: I (1–4–3–4–20) [1–2–2], II (1–4–3–4–15) [1–1–2], III (1–2–1–3–15) [1–1–0], IV (1–2–2–3–12) [0–1–0]; homologies of setae and solenidia indicated in Table 1. Famulus on tarsi I inserted between solenidia ω 1 and ω 2. Solenidion on tibiae IV inserted in their middle part.

Type deposition. The holotype and two paratypes are deposited in the collection of SMNH. Six paratypes are deposited in the collection of TSUMZ .

Etymology. The specific name paraokinawana refers to the similarity between the new species and Galumnella okinawana Aoki, 2009 .

Remarks. In having unilaterally dilated, barbed bothridial setae and reticulate notogaster, Galumnella paraokinawana sp. nov. is morphologically most similar to Galumnella okinawana Aoki, 2009 from Japan (see Aoki 2009), but clearly differs from the latter species by the body surface (completely foveolate; reticulate ornamentation represented by large cells and located only in central part of notogaster versus completely granulate; reticulate ornamentation represented by small cells and located almost on all notogaster).

Roman letters refer to normal setae, Greek letters to solenidia (except ɛ = famulus). Single prime (’) marks setae on anterior and double prime (”) setae on posterior side of the given leg segment. Parentheses refer to a pair of setae.

Figures

FIGURES 26–30. Galumnella paraokinawana sp. nov., adult: 26—dorsal view; 27—ventral view (gnathosoma, legs and right pteromorph not shown); 28—subcapitulum, ventral view; 29—palp, left, ventroparaxial view; 30—chelicera, right, antiaxial view. Scale bar 50 µm (26, 27), 20 µm (28–30).

FIGURES 31–33. Galumnella paraokinawana sp. nov., adult: 31—anterior part of body, lateral view (gnathosoma, pteromorph and legs not shown); 32—posterior part of body, lateral view; 33—posterior view. Scale bar 50 µm.

FIGURES 34–37. Galumnella paraokinawana sp. nov., adult: 34—leg I, right, antiaxial view; 35—trochanter, femur and genu of leg II, left, ventroantiaxial view; 36—trochanter, femur and genu of leg III, left, antiaxial view; 37—leg IV, left, ventroantiaxial view. Scale bar 20 µm.

FIGURES 38–45. Galumnoidea, adults, microscope images: 38—Pergalumna hugocoetzeeae sp. nov., prodorsal sculpturing and rostrum, dorsoanterior view; 39—Pergalumna hugocoetzeeae sp. nov., dorsosejugal suture; 40—Pergalumna hugocoetzeeae sp. nov., dorsophragma and sejugal porose area; 41—Pergalumna pietertheroni sp. nov., granulate sculpturing in anogenital region; 42—Pergalumna pietertheroni sp. nov., dorsophragma and sejugal porose area; 43—Galumnella paraokinawana sp. nov., foveolate ornamentation in epimeral region; 44—Galumnella paraokinawana sp. nov., reticulate ornamentation between genital and anal apertures; 45—Galumnella paraokinawana sp. nov., claw of leg tarsus II.