Pergalumna elongatiporosa, Ermilov, Sergey G., Alvarado-Rodriguez, Olman & Retana-Salazar, Axel P., 2014

Ermilov, Sergey G., Alvarado-Rodriguez, Olman & Retana-Salazar, Axel P., 2014, Two new species of Pergalumna (Acari, Oribatida, Galumnidae) from Costa Rica, including a key to all species of the genus from the Neotropical region, ZooKeys 435, pp. 7-23 : 7-10

Taxon classification Animalia Oribatida Galumnidae

Pergalumna elongatiporosa sp. n. Figs 1-4

Diagnosis.

Body size: 332-352 × 246-266. Body surface and pteromorphs microgranulate. Rostral, lamellar and interlamellar setae well developed, barbed. Bothridial setae setiform, ciliate unilaterally. Anterior notogastral margin not developed. Three pairs of porose areas: Aa and A3 elongate triangular, A1 long, band-shaped, specifically curving, Aa located between notogastral alveoli la and lm. Median pore and postanal porose area absent. Aggenital and ano-adanal setae simple, short. Solenidion φ on tibia IV inserted in proximal part.

Description.

Measurements. Body length: 332 (holotype, male), 340-352 (two paratypes: one male and one female); notogaster width: 246 (holotype), 246-266 (two paratypes).

Integument. Body color brown to black-brown. Body surface and pteromorphs with dense microgranules (their diameter up to 2). Pteromorphs with poorly visible wrinkles.

Prodorsum. Rostrum broadly rounded. Rostral (ro, 24-28), lamellar (le, 49-53) and interlamellar (in, 69-77) setae setiform, barbed. Bothridial setae (ss, 90-102) setiform, densely ciliate unilaterally. Exobothridial setae absent. Lamellar and sublamellar lines distinct, parallel, curving backwards. Insertions of lamellar setae distanced from the lamellar lines. Porose areas Ad small, elongate oval (8-12 × 2-4), located latero-posteriorly to interlamellar setae.

Notogaster. Anterior notogastral margin not developed. Dorsophragmata (D) long. Notogastral setae represented by 10 pairs of alveoli. Three pairs of porose areas well visible, with distinct margins: Aa weakly triangular, transversally oriented (36-57 × 8-12), A1 long, band-shaped, specifically curving (57-69 × 8-13), A3 elongate, narrowly triangular (28-32 × 8-16). Porose areas Aa located between notogastral alveoli la and lm. Median pore absent. All lyrifissures distinct; im and opisthonotal gland openings (gla) located latero-anteriorly to A1.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae typical for Pergalumna (see Engelbrecht 1972; Ermilov et al. 2010; Ermilov and Anichkin 2011). Subcapitulum longer than wide (90-94 × 77-86). Subcapitular setae setiform, slightly barbed; a (14-16) longer than m (10) and h (8). Two pairs of adoral setae (or1, or2, 8) setiform, hook-like distally, barbed. Palps (73) with setation 0 –2–1–3– 9(+ω). Solenidion attached to eupathidium, both located on dorsal tubercle. Chelicerae (118-123) with two setiform, barbed setae; cha (28-32) longer than chb (20). Trägårdh’s organ distinct.

Epimeral and lateral podosomal regions. Apodemes 1, 2, sejugal and 3 well visible. Six pairs of setiform epimeral setae observed; setal formula: 1 –0–2– 3. Setae 4a, 4b (4) thin, smooth, shorter than 1b, 3b, 3c, 4c (8-10), slightly barbed. Pedotecta II (Pd II) scale-like, rounded in ventral view. Discidia (dis) pointly triangular. Circumpedal carinae (cp) distinct, directed posterior of setae 3b.

Anogenital region. Six pairs of genital (g1, g2, 8; g3-g6, 4), one pair of aggenital (ag, 4), two pairs of anal (an1, an2, 4) and three pairs of adanal (ad1-ad3, 4) setae minute, thin, smooth. Anterior parts of genital figs with two setae. Adanal setae ad3 inserted laterally or antero-laterally to lyrifissures iad. Postanal porose area absent.

Legs. Morphology of leg segments, setae and solenidia typical for Pergalumna (see Engelbrecht 1972; Ermilov et al. 2010; Ermilov and Anichkin 2011). Formulae 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. Solenidion φ on tibia IV inserted in proximal part.

Type deposition.

The holotype is deposited in the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; one paratype is deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia; one paratype is deposited in the collection of the Centro de Investigación en Estructuras, Microscópicas (CIEMIC), Ciudad de la Investigación, Universidad de Costa Rica, San José, Costa Rica.

Etymology.

This specific name “elongatiporosa” refers to the elongate porose areas A1.

Remarks.

In having the setiform bothridial setae, well developed interlamellar setae, absence of anterior notogastral margin and presence of three pairs of porose areas (Aa transversally elongated), Pergalumna elongatiporosa sp. n. is most similar to Pergalumna horvathorum P. Balogh, 1997 and Pergalumna sura P. Balogh, 1997 (see also Ermilov et al. 2014) from the Neotropical region. However, it differs from both by the smaller body size (332-352 × 246-266 versus 394-410 × 295 in Pergalumna horvathorum and 443-498 × 315-377 in Pergalumna sura ), microgranulate body surface (versus smooth in Pergalumna horvathorum and Pergalumna sura ), band-shaped, specifically curving porose areas A1 (versus elongate oval in Pergalumna horvathorum and triangular in Pergalumna sura ) and elongate triangular porose areas A3 (versus absent in Pergalumna horvathorum and oval in Pergalumna sura ).