Siculobata (Paraleius) americana, Ermilov & OConnor, 2020

Ermilov, Sergey G. & OConnor, Barry, 2020, Two New Species Of Insect Phoretic Siculobata (Paraleius) (Acari, Oribatida, Scheloribatidae) From U. S. A. And Trinidad, Acta Zoologica Academiae Scientiarum Hungaricae 66 (4), pp. 329-343 : 331-337

publication ID	https://doi.org/ 10.17109/AZH.66.4.329.2020
persistent identifier	https://treatment.plazi.org/id/0F270749-FFFB-FFE6-FED4-FAF918C9F9BB
treatment provided by	Felipe
scientific name	Siculobata (Paraleius) americana
status	sp. nov.

Treatment

Siculobata (Paraleius) americana View in CoL sp. n.

( Figs 1–4 View Fig View Fig View Fig View Fig )

Diagnosis. Body size: 348 × 182–199. Rostrum pointed. Prolamella and lateral keel-shaped ridge present. Sublamella absent. Rostral, lamellar, interlamellar and exobothridial setae comparatively long, setiform, barbed. Bothridial seta clavate, barbed. Notogastral seta short, setiform, with attenuate tip, roughened. Epimeral and anogenital setae short, setiform, slightly barbed. Pedotectum II present. Circumpedal carina short. All leg pretarsi with one, slightly modified claw. Femora II–IV with tubercle-like cerotegumental excrescence in ventroanterior part.

Description. Measurements. Body length: 348 (holotype, female), 348, 348 (two paratypes, two females); notogaster width: 182 (holotype), 182, 199 (two paratypes).

Integument. Body color light brown. Surface microfoveolate (visible only under high magnification in dissected specimens).

Prodorsum ( Figs 1A View Fig , С; 4A-C). Rostrum distinctly protruding, triangular, pointed. Lamella as long as half of prodorsum (measured in lateral view). Prolamella complete, thin. Sublamella absent. Sublamellar porose area rounded (4) or oval (4 × 2). Lateral keel-shaped ridge developed. Rostral (57–61), lamellar (65–69), interlamellar (73–77) and exobothridial (36–41) setae setiform, barbed. Bothridial seta (45–53) clavate, with long, roughened stalk and shorter, barbed, clearly rounded apically head. Dorsosejugal porose area not observed.

Notogaster ( Figs 1A, C View Fig ; 2A View Fig ). Anterior notogastral margin distinctly convex medially. Ten pairs of notogastral setae (18–24) setiform, with attenuate tip, roughened. Four pairs of sacculi with small opening and slightly elongate chamber. Distance S1–S1 little shorter than S2–S2. Notogastral lyrifissure (ia, im, ip, ih, ips), opisthonotal gland opening and circumgastric sigillar band distinct. Circumgastric scissure present, no often slightly visible.

Gnathosoma ( Figs 2 View Fig B-D). Subcapitulum longer than wide (69–73 × 53–61). Subcapitular (a, 14–16; m, 14–16; h, 24) and adoral (6) setae setiform, barbed. Palp (length 45–53) with typical setation 0-2-1-3-9(+ω). Postpalpal seta (6) spiniform. Chelicera (length 77–82) with two setiform, barbed setae (cha, 24–28; chb, 14–18). Trägårdh’s organ elongate triangular.

Epimeral and lateral podosomal regions ( Figs 1B, C View Fig ; 4D View Fig ). With typical epimeral setal formula: 3-1-3-3. Epimeral setae (1b, 1c, 3b, 3c, 24–32; 1a, 2a, 3a, 4a, 4c, 16–20; 4b, 10–12) setiform, slightly barbed, 1a, 2a, 3a thicker and more barbed. Pedotecta I and II represented by small lamina, I rounded in lateral view, II trapezoidal in ventral view, with one elongated tooth-like top. Discidium slightly developed, rounded. Humeral porose area Ah represent- ed by saccule, Am absent. Circumpedal carina short, directed to acetabulum IV.

Anogenital region ( Figs 1B, C View Fig ; 2A View Fig ). Four pairs of genital (8–10), one pair of aggenital (10–12), two pairs of anal (14–18) and three pairs of adanal (20–24) setae setiform, thin, roughened. Adanal lyrifissure distinct. Adanal seta ad 1 posterior, ad 2 lateral, ad 3 anterior to anal aperture. Marginal porose area poorly visible, complete, band-like, very thin. Preanal organ of typical, goblet-like form. Ovipositor elongated (134 × 32), blade (61) shorter than length of distal section (beyond middle fold; 73). Each of the three blades with four smooth setae, ψ 1 ≈ τ 1 (32) setiform, ψ 2 ≈ τ a ≈ τ b ≈ τ c (14) thorn-like. Six coronal setae (2) spiniform.

umental excrescence in ventroanterior part of leg femur II; F = leg claw II; G = leg claw III Roman letters refer to normal setae, Greek letters to solenidia (except ε = famulus). Single prime (’) marks setae on the anterior and double prime (”) setae on the posterior side of a given leg segment. Parentheses refer to a pair of setae.

Leg ( Figs 3 View Fig A-D; 4E-G). Monodactylous. Claw slightly modified, forming slight right angle (not evenly, semi-oval, curved), sparsely barbed on dorsal side, with unclear tubercle ventrodistally. Claw of pretarsi I, II slightly thicker than claw of pretarsi III, IV. Dorsoparaxial porose area on all femora and on trochanters III, IV present. Ventroproximal porose area on all tarsi and ventrodistal porose area on all tibiae not observed. Femora II-IV with tubercle-like cerotegumental excrescence in ventroanterior part. Formulas of leg setation and solenidia: I (1-5-3-4-18) [1-2-2], II (1-5-2-4-15) [1-1-2], III (2-3-1-3-15) [1-1-0], IV (1-2-2-3- 12) [0-1-0]; homology of setae and solenidia indicated in Table 1. Famulus of tarsus I short, straight, slightly swollen distally, located between solenidion ω 2 and seta ft”. Solenidion ω 1 on tarsus I, ω 1 and ω 2 on tarsus II bacilliform, other solenidia setiform.

Material examined. Holotype (female) and two paratype females: USA, Michigan, Cheboygan Co., University of Michigan Biological Station, 45°33’42”N, 84°40”03”W, active phoresy on Osmoderma eremicola ( Coleoptera , Scarabaeidae ), 2 August 1982 (B.M. OConnor) (BMOC 82-0802-017).

Type deposition. The holotype and one paratype are deposited in the collection of the University of Michigan Museum of Zoology, Ann Arbor, MI, USA ; one paratype is deposited in the collection of the Tyumen State University Museum of Zoology , Tyumen, Russia . All specimens are stored in ethanol with a drop of glycerol.

Etymology. The specific name americana refers to the country of origin, U.S.A.

Remarks. The new species is morphologically similar to Siculobata (Paraleius) leontonycha ( Berlese, 1910) in having clavate bothridial seta, but differs from the latter by the presence of one claw on all leg pretarsi (versus three claws) and slightly modified (slightly curved) claw on all leg pretarsi (versus central claw strongly modified, abruptly curved).

NORTON (1973) listed mites phoretic on O. eremicola , and noted the presence of the oribatid mite, Mesoplophora pulchra Sellnick, 1928 (located on venter near coxae), on two of fourteen museum specimens of this beetle he examined. He did not mention the species described here. Osmoderma eremicola larvae inhabit galleries in decaying wood ( HOffMAN 1939).

shown). Scale bar 50 Μm