Fortuynia smiti Ermilov, Tolstikov, Mary & Schatz

Ermilov, Sergey G., Tolstikov, Andrei V., Mary, Nathalie & Schatz, Heinrich, 2013, Oribatid mites (Acari, Oribatida) from riverine environments of some islands in Oceania, ZooKeys 318, pp. 47-57: 49-53

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Fortuynia smiti Ermilov, Tolstikov, Mary & Schatz

sp. n.

Fortuynia smiti Ermilov, Tolstikov, Mary & Schatz   ZBK   sp. n. Figs 1-13


Body size 564-614 × 381-431. Body surface microfoveolate. Lamellar lines, internal and lateral ridges developed. Rostral setae weakly thickened, with short cilia; lamellar setae thin, slightly barbed. Interlamellar and exobothridial setae minute. Sensilli short, clavate, smooth. Notogaster with 14 pairs of setae and one pair of setal alveoli (c3). Length of setae c1, da > c2, dm, la, lm > p1 > lp, h3 > dp, h1, h2 > p1, p2. Adanal setae ad1 longer than other adanal setae.


Male.Measurements. Body length 581 (holotype, male), 564-614 (six paratypes, all males); body width 398 (holotype), 381-431 (six paratypes, all males).

Integument. Body color brown to yellow-brownish. Body surface microfoveolate (clearly visible under high magnification, × 1000). Lateral podosomal regions with tuberculate cerotegument (diameter of tubercles up to 6).

Prodorsum. Rostrum rounded. Lamellar lines (ce) strong, equal to half of prodorsum. Internal ridges (ci) present, very thin, reaching insertions of interlamellar setae. Anterior part of lamellar lines with short lateral ridges (cl), which are located perpendicularly to them. Rostral setae (ro, 69-82) setiform, weakly thickened, with short cilia, set on small tubercles. Lamellar setae (le, 41-45) setiform, thin, slightly barbed. Interlamellar (in) and exobothridial (ex) setae minute (1), poorly visible. Sensilli (ss, 32-36) curved backwards, with short stalk and longer clavate, smooth head.

Notogaster. Lenticulus present, with amorphic borders. Notogastral region with 14 pairs of setiform, smooth notogastral setae and one pair of setal alveoli (c3). Setae c1, da (90-102) longer than c2, dm, la, lm (69-82), p1 (30-36), lp, h3 (28-32), dp, h1, h2 (20-24); p1, p2 shortest (4-6). Lyrifissures ia, im, ip, ih and ips and opisthonotal gland openings (gla) distinct, located typically for the genus.

Gnathosoma. Subcapitulum longer than wide (118-205 × 143-151). Subcapitular setae setiform, smooth; h (82-86) longer than a and m (both 53-57). Lips only with one spiniform seta (or, 10-12). Palps (123-131) with setation 0 –2–1–3– 9(+ω). All setae smooth. Solenidion weakly thickened, blunt-ended, pressed to surface of tarsus, not attached with eupathidium. Chelicerae (188-205) with two barbed setae; cha (69-73) longer than chb (45-49). Trägårdh’s organ (Tg) long, conical.

Epimeral and lateral podosomal regions. Apodemes 1, 2, 3 and sejugal well developed. Apodemes 2 and sejugal fused medially. Epimeral setal formula 3 –1–3– 2; setae setiform, smooth. Setae 1b (49-61) longer than 3b (41-49), 1a, 2a, 3a, 3c, 4a, 4c (24-36); 1c shortest (16-20). Pedotecta I (Pd I) of medium size, concave.

Anogenital region. Anogenital setae setiform, thin, smooth. Five pairs of genital (g1-g5), one pair of aggenital (ag), two pairs of anal (an1, an2) and the anterior two pairs of adanal (ad2, ad3) setae similar in length (28-32); only the first pair of adanal setae ad1 longer (41-53). Lyrifissures iad located in paraanal position.

Legs. Claw of each leg large, smooth. Porose areas developed typically for the genus ( Bayartogtokh et al. (2009). Formulae of leg setation and solenidia: I (1 –4–2–3– 18) [1 –2– 2], II (1 –4–2–3– 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 2. Setae setiform, well or slightly barbed except smooth p on tarsi I, II and s. Famulus (e) short, straight, weakly blunt-ended. All solenidia long setiform, pointed.

Material examined.

Holotype (male) and six paratypes (all males): Locality 02.

Type deposition.

The holotype (in alcohol) is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; two paratypes (in alcohol) are deposited in the collection of the Siberian Zoological Museum, Novosibirsk, Russia; four paratypes (in alcohol) are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology. The species is named after our colleague, the renowned acarologist, Dr. Harry Smit (Netherlands Centre for Biodiversity Naturalis, Leiden, The Netherlands), who has collected the specimens of Fortuynia smiti   sp. n.


Fortuynia smiti   sp. n. is most similar to Fortuynia marina   Hammen, 1960 from New Guinea ( Hammen 1960) in having following combination of morphological characters: body of medium size; presence of lamellar lines and internal ridges; presence of alveoli notogastral setae c3. However it differs from the latter by the long notogastral setae dm, lm, c2, p1, epimeral setae 3b and adanal setae ad1 (versus short in Fortuynia marina   ) and the presence of prodorsal lateral ridges (versus absent in Fortuynia marina   ).