Dolicheremaeus leonilae, Ermilov & Salavatulin & Khaustov, 2025

Dolicheremaeus leonilae sp. nov. ( Figs. 1–8 View Figures 1–3 View Figures 4–8 )

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Type material

Holotype (female) and seven paratypes ( two males and five females): Southern Vietnam, Dong Nai Province, Cat Tien National Park , 11° 26′ 51.04″ N, 107° 24′ 52″ E, 145 m a.s.l., moss on rotting tree in the forest, 8 December 2024 ( V. A. Khaustov and V. M. Salavatulin) GoogleMaps

Type deposition

The holotype is deposited in the collection of the Senckenberg Museum of Natural History , Görlitz, Germany ; four paratypes are deposited in the collection of the University of Tyumen, Museum of Zoology, Tyumen, Russia ; three paratypes are in the personal collection of the first author. All specimens are preserved in 70% solution of ethanol with a drop of glycerol .

Diagnosis

Body length: 450–480. Notogaster with short, slightly visible ridges and small, sparse foveolae. Interlamellar seta medium-sized, stiff, erect, barbed; bothridial seta medium-sized, clavate, roughened. Paired medial prodorsal condyles broad; medial notogastral condyles represented by five to seven, slightly developed parts. Notogastral setae c, la, and lm medium-sized, stiff, erect, barbed; other setae long, subflagellate, barbed. Adanal seta ad 3 anterolateral to anal plate, distanced from margin of ventral plate. Adanal lyrifissure oblique, close to anal plate. Leg setae u' and u'' on all tarsi setiform.

Description Measurements – Body length: 480 ( holotype), 450 (male paratypes); 450–480 (female paratypes); body width: 233 ( holotype), 225 (male paratypes); 225–240 (female paratypes). Body ratio (length/width) about 2.0.

Integument – Body color light brown to yellowish, but legs and genital plates dark brown. Surface densely microgranulate; some short, slightly visible ridges on notogaster; notogaster and anogenital region (including anal plate) with small (diameter up to 4), sparse foveolae; dorsal side (mostly near costulae) lateral part of prodorsum partially with small (diameter up to 4), dense tubercles; lateral part of body (between bothridium and acetabula I–III) with dense tubercle (diameter up to 7); median part of epimere I with indistinct, reticulate pattern; dense foveolae (diameter up to 4) present ventral to pedotectum I.

Prodorsum – Rostrum broadly rounded. Costula long, protruding anterior to insertion of lamellar seta; tutorial carina absent. Rostral (64–67) and lamellar (64–71) setae setiform, barbed; interlamellar seta (60–67) stiff, erect, barbed; bothridial seta (56–60) clavate, with medium-sized, smooth stalk and shorter, roughened head; exobothridial seta (19–22) stiff, slightly barbed. Paired lateral prodorsal condyles simple, tubercle-like; paired medial prodorsal condyles broad, separated medially.

Notogaster – Paired lateral notogastral condyles simple, tubercle-like to triangular; medial notogastral condyles slightly developed, represented by several (five to seven) simple or quadrangular parts located close to each other. Notogastral setae c, la, and lm (52–60) stiff, erect, barbed; other setae (82–86) subflagellate, barbed. Opisthonotal gland opening and all lyrifissures distinct; gla and im close to each other, lateral to lm; ip between p 2 and p 3; ips between p 3 and h 3; ih anterior to h 3.

Gnathosoma – Subcapitulum size: 101–109 × 75–82; subcapitular setae ( a: 22–26; m, h: 34–37) setiform, slightly barbed. Palp length: 56–60; setation: 0-2-1-3-8(+ω); postpalpal seta (7) spiniform, smooth. Chelicera length: 101–109; seta cha (34–37) setiform, barbed; chb (17–19) thinner, setiform, slightly barbed.

Epimeral and lateral podosomal regions – Epimeral setal formula: 3-1-3-3; setae 1a, 2a, 3a, 4b, and 4c (13–15) setiform, roughened; other setae (37–45) setiform, slightly barbed. Pedotectum I as large lamina, pedotectum II as small lamina.

Anogenital region – Anogenital setal formula: 4-1-2-3; genital and anal setae (22–30) setae setiform, roughened to slightly barbed; aggenital and adanal setae (34–37) setiform, barbed; seta ad 3 anterolateral to anal plate, distanced from margin of ventral plate. Adanal lyrifissure oblique, close to anal plate.

Legs – Claw of each leg strong, slightly barbed on dorsal side. Dorsal side of all tarsi without teeth. Dorsoparaxial porose area on femora I–IV poorly visible; porose area on trochanters III and IN not observed. Formulas of leg setation and solenidia: I (1-4-3-4-16) [1-2-2], II (1-4-3-3-15) [1-1-2], III (2-3-1-2-15) [1-1-0], IV (1-2-2-2-12) [0-1-0]; homology of setae and solenidia indicated in Table 1; setae u' and u'' on all tarsi setiform (not thorn-like).

Comparison

The presence of a large number of the medial notogastral condyles (five to seven) in D. leonilae sp. nov. is unusual within Dolicheremaeus (one pair is developed or medial notogastral condyles absent in typical cases) and distinguishes this species from all species of the genus.

The new species is most similar to D. ceylonicus Balogh, 1970 from Sri Lanka in having clavate bothridial seta as well as medium-sized, stiff notogastral setae c, la, lm and long, subflagellate notogastral setae lp, h 1 – h 3, p 1 – p 3. However, the new species differs from the latter by smaller (length: 450–480 versus 735) and broader (length/width about 2.0 versus 2.5) body; the morphology of the medial prodorsal condyles (broad versus narrow), the number of the medial notogastral condyles (five to seven versus two), the presence (versus absence) of foveolate ornamentation on the notogaster and in the anogenital region; shorter interlamellar seta (not longer than rostral and lamellar setae versus distinctly longer), and the morphology and length of the adanal seta ad 2 (setiform, similar in length to other adanal setae versus flagellate, longer than other adanal setae).

Etymology

The species is named in honor of Dr. Leonila Corpuz-Raros, the well-known acarologist from the Philippines, for her extensive contributions to our knowledge of Otocepheidae .