Sacculogalumna zuliaensis, Ermilov, 2024

Ermilov, Sergey G., 2024, New Galumnidae (Acari, Oribatida) from the Merida and Zulia States, Venezuela, Zootaxa 5514 (5), pp. 481-493 : 482-486

Sacculogalumna zuliaensis sp. nov.

( Figures 1 , 2 )

Type material. Holotype (female) and nine paratypes (five males and four females): Northwestern Venezuela, Zulia State, El Tucaco , 200 m a.s.l., pasture meadow, 19.IV.1981 (L. Masner).

The holotype is deposited in the collection of the Canadian National Collection, Ottawa, Canada; nine paratypes are in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia. All specimens are preserved in 70% solution of ethanol with a drop of glycerol.

Additional (non-type) material. Thirty-four specimens: Western Venezuela, Merida State, 2300 m a.s.l., 10 km east of Tabay , collected by sweeping in cloud forest, 28.IV.1981 (L. Masner and Marsh). All specimens are preserved in 70% solution of ethanol with a drop of glycerol and stored in the personal collection of the author.

Diagnosis. Body length 720–810. Body surface densely microgranulate; notogaster, pteromorph, genital and anal plates, mediobasal part of prodorsum striate; short stria in medioanterior part of prodorsum forming reticulate pattern; subcapitular mentum, adanal region, epimere I, lateral part of epimere II, region between genital and anal aperture, anterior part of pteromorph foveolate; aggenital region with tubercles and short ridges. Rostrum pointed, with two lateral teeth. Lamellar and sublamellar lines parallel, curving backwards at ventral ends. Rostral, lamellar, interlamellar, and bothridial setae long, setiform, barbed; le longest, ro and in shortest. Dorsosejugal porose area absent. Dorsosejugal suture complete. Notogaster with lenticulus. Octotaxic system represented by three pairs of saccules (Sa, S2, S3); Sa located anteromedially to la. Median pore absent. Opisthonotal gland opening and lyrifissure im located anterolaterally to S2 and distanced from it. Epimeral setal formula 1-0-2-3; setae 1b, 3b, 3c longer than others. Circumpedal carina long, directed to epimere I. Anogenital setae comparatively short. Adanal lyrifissure slightly oblique, located close to posterior half of anal plate. Postanal porose area absent. Leg famulus bent mediodistally, directed forwards, inserted between seta ft” and solenidion ω 2; solenidion on tibia IV inserted in anterior half of dorsal part of the segment but near to the middle.

Description. Measurements. Body length 795 (holotype), 720–765 (male paratypes), 780–810 (female paratypes); notogaster width 570 (holotype), 540–585 (male paratypes), 570–600 (female paratypes).

Integument. Body color brown to black. Body surface densely microgranulate (granules larger on subcapitular mentum and on epimeres).Additionally, notogaster, pteromorph (except anterior part), genital and anal plates, region behind anal aperture, mediobasal part of prodorsum heavily striate; short stria in medioanterior part of prodorsum forming partially reticulate pattern; subcapitular mentum, adanal region, epimere I, lateral part of epimere II, region between genital and anal aperture, anterior part of pteromorph distinctly foveolate (diameter of foveola up to 9); aggenital region and surface anterior and posterior of genital aperture with rounded and elongated tubercles and short ridges.

Prodorsum. Rostrum pointed, with two strong (sometimes vestigial) lateral teeth. Lamellar and sublamellar lines slightly thickened, parallel, curving backwards at ventral ends. Rostral (94–105), lamellar (120–124), interlamellar (94–105), and bothridial (105–120) setae setiform, barbed; ro and le thicker than in and bs; insertion of lamellar seta distanced from lamellar line; exobothridial seta not observable. Dorsosejugal porose area absent. Dorsophragma long, elongate longitudinally.

Notogaster. Dorsosejugal suture complete, convex medially. Lenticulus well visible but without distinct border. Ten pairs of notogastral setae represented by setal alveoli. Octotaxic system represented by three pairs of saccules (Sa, S2, S3) having short opening and drop-like channel; Sa slightly distanced from pteromorphal hinge, located anteromedially to la. Median pore absent. Opisthonotal gland opening and all lyrifissures distinct: gla and im located anterolaterally to S2 and distanced from it; ip between p 1 and p 2; ih and ips close to each other, anteriorly to p 3.

Gnathosoma . Subcapitulum size 191–202 × 172–176; subcapitular (a 36–41, m 41–45, h 41–49) and adoral (22–26) setae setiform, slightly barbed; m slightly thinner than a and h. Chelicera length 247–255; cheliceral setae (cha 71–75, chb 52–56) setiform, barbed. Palp length 154–161; setation 0-2-1-3-9(+ω); postpalpal seta (9) spiniform, smooth.

Epimeral and lateral podosomal regions. Epimeral setal formula 1–0–2–3; setae (1b, 3b, 3c 52–60, 4a, 4c 34–41, 4b 26–34) setiform, slightly barbed. Circumpedal carina long, directed to epimere I.

Anogenital region. Anogenital setal formula 6-1-2-3; genital (g 1 34–37, g 2 26–34, g 3 – g 6 22–30), aggenital (26– 30), anal (34–37), and adanal (22–26) setae setiform, slightly barbed; anterior edge of genital plate with two setae but third seta located near to them; aggenital seta located posterolateral to genital aperture; adanal setae ad 1 and ad 2 posterior, ad 3 lateral to anal plate; distance ad 1 – ad 2 slightly shorter than ad 2 – ad 3. Adanal lyrifissure slightly oblique, located close to posterior half of anal plate. Postanal porose area absent. Ovipositor typical for Galumnidae ( Ermilov 2010) , with length 367; length of blade 116; length of distal section (beyond middle fold) 251; ovipositor width 56; each of the three blades with four smooth setae: ψ 1 ≈ τ 1 (75) rod-like; ψ 2 ≈ τ a ≈ τ b ≈ τ c (34) thinly thorn-like; six coronal setae (22) thinly thorn-like.

Legs. Median claw distinctly thicker than lateral claws, all slightly barbed on dorsal side. Porose area on femora I–IV and on trochanters III, IV well visible; proximoventral porose area on tarsi I–IV and distoventral porose area on tibiae I–IV slightly observable. 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]; homology of setae and solenidia indicated in Table 1 ; famulus bent mediodistally, directed forwards, inserted between seta ft” and solenidion ω 2; solenidion on tibia IV inserted in anterior half of dorsal part of the segment but near to the middle.

Remarks. Sacculogalumna zuliaensis sp. nov. is similar to S. hexasacculata Ermilov, 2017 (see Ermilov & Friedrich 2017) from Peru in having stria on the prodorsum, notogaster, pteromorphs, genital and anal plates. However, the new species differs from the latter by the following main traits: the presence (versus absence) of foveolae in the anogenital region, in anterior part of the pteromorphs, and on the subcapitular mentum; pointed rostrum with two lateral teeth (versus rostrum rounded); the ornamentation of anterior part of the prodorsum (short stria in medioanterior part of prodorsum forming reticulate pattern versus reticulate pattern absent) and pteromorph (foveolae present versus foveolae absent), the length of the interlamellar seta (shorter than lamellar seta versus longer than lamellar seta), the location of the notogastral saccule Sa (anteromedially to la versus between la and lm); the absence (versus presence) of the dorsosejugal and postanal porose areas; the location of the adanal lyrifissure (oblique, located close to posterior half of the anal plate versus parallel and close to anterior half of the anal plate).

Also, S. zuliaensis is similar to Pergalumna (Pergalumna) finnamorei Ermilov, 2019 from Ecuador in its main morphological traits: large body size; prodorsum, notogaster, pteromorphs, genital and anal plates striate; rostrum pointed; interlamellar seta long; bothridial seta setiform; dorsosejugal suture complete; notogaster with lenticulus; median pore absent; circumpedal carina long. However, the new species differs from the latter by the following main traits: the presence (versus absence) of foveolae in the anogenital region, in anterior part of the pteromorphs, and on the subcapitular mentum; the presence of the simple stria on the notogaster (versus stria mostly forming elongate cells); the presence (versus absence) of one pair of the lateral teeth on the rostrum; the presence of saccules (versus porose areas) on the notogaster; the absence (versus presence) of the dorsosejugal and postanal porose areas; longer anogenital and some epimeral (e.g., 1b, 3b) setae; and the location of the adanal lyrifissure (oblique, located close to posterior half of the anal plate versus parallel and close to anterior half of the anal plate).

Etymology. The species name zuliaensis refers to the place of origin, Zulia State.

Figures

FIGURE 1. Sacculogalumna zuliaensis sp. nov., adult: A—dorsal view, B—anterior part of prodorsum, anterodorsal view, C—ventral view (legs and right pteromorph not shown), D—right lateral view (gnathosoma, legs and right pteromorph not shown), E—posterior view (part of left half not shown). Scale bar 200 μm (A, C–E), 50 μm (B).

FIGURE 2. Sacculogalumna zuliaensis sp. nov., adult: A—subcapitulum, ventral view, B—palp, right, antiaxial view, C— chelicera, left, paraxial view, D—leg I, right, antiaxial view, E—leg II, left, ventroparaxial view, F—leg III (trochanter not shown), right, paraxial view, G—leg IV, left, antiaxial view. Scale bars 100 μm (D–G), 50 μm (A, C), 20 μm (B).