Pergalumna paraboliviana, Ermilov, Sergey G. & Gwiazdowicz, Dariusz J., 2015

Ermilov, Sergey G. & Gwiazdowicz, Dariusz J., 2015, Peruvian oribatid mites (Acari, Oribatida) from the German Biological Expedition, with description of a new species of the genus Pergalumna, ZooKeys 487, pp. 87-96 : 89-92

Taxon classification Animalia Oribatida Galumnidae

Pergalumna paraboliviana sp. n. Figs 1, 2, 3-5

Diagnosis.

Body size: 531-697 × 365-448. Body surface punctate and with striate bands. Rostrum pointed. Rostral, lamellar and interlamellar setae well developed, barbed. Bothridial setae setiform, ciliate unilaterally. Lamellar and sublamellar lines parallel, curving backwards. Anterior notogastral margin not present. Notogaster with three pairs of porose areas: Aa and A3 oval, A1 slightly triangular, longitudinally elongated. Median pore absent. Adanal setae ad3 inserted laterally or antero-laterally to lyrifissures iad. Postanal porose area oval.

Description.

Measurements. Body length: 614 (holotype, male), 531-614 (three paratypes: all males) to 697 (paratype: one female); notogaster width: 365 (holotype), 398 (three paratypes: all males) to 448 (paratype: one female).

Integument. Body color light brown to brown. Body surface punctate. Ventral part of pteromorphs with slightly developed reticulate pattern in one paratype. Prodorsum with one transverse and two longitudinal striate bands (s): transverse band located anterior to insertions of interlamellar setae; longitudinal bands parallel, each located from the transverse band medially to insertions of lamellar setae. Posterior part of notogaster with two parallel, longitudinal striate bands located medially to notogastral alveoli h1. Between these longitudinal bands, two arcuate bands present, which fused medially by the transverse band. Ventral body side with one pair of diagonal striate bands nearly of pedotecta I (Pd I), one transverse striate band located anteriorly to genital plates, two lateral, transversal striate bands located between genital and anal plates, and one arcuate striate band located posteriorly to anal plates, extending marginally into the ano-adanal region. All striate bands well visible only in light colored or dissected specimens.

Prodorsum. Rostrum pointed (see in dorso-lateral and frontal views). Rostral (ro, 57-61 in males to 82 in female), lamellar (le, 49-57 in males to 69 in female) and interlamellar (in, 110-118 in males to 127 in female) setae simple, barbed; lamellar setae thinnest, interlamellar setae thickest. Bothridial setae (ss, 159-172 in males to 205 in female) setiform, densely ciliate unilaterally. Exobothridial setae absent. Lamellar and sublamellar lines distinct, parallel, curving backwards. Insertions of lamellar setae distanced from lamellar lines. Porose areas Ad absent.

Notogaster. Anterior notogastral margin not developed. Dorsophragmata of medium size, longitudinally elongated. Notogastral setae represented by 10 pairs of alveoli. Three pairs of porose areas with distinct margins: Aa (20-24 × 14-16) and A3 (12-16 × 8-12) oval, A1 (36-45 × 8-20) slightly triangular, longitudinally elongated. Porose areas Aa located between notogastral alveoli la and lm. Median pore absent. All lyrifissures distinct; im located latero-anteriorly to A1. Opisthonotal gland openings (gla) located laterally to A1.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae typical for Pergalumna (see Engelbrecht 1972; Ermilov et al. 2011, 2014b, c). Subcapitulum longer than wide (127-131 × 114-118). Subcapitular setae simple, slightly barbed; a (32) longer than m (16-20) and h (20). Two pairs of adoral setae (or1, or2, 12) setiform, hook-like distally, barbed. Palps (77-82) with setation 0 –2–1–3– 9(+ω). Solenidion attached to eupathidium, both located on dorsal tubercle. Chelicerae (143-147 to 196 in female) with two setiform, barbed setae; cha (65-69) longer than chb (45-49). Trägårdh’s organ distinct.

Epimeral and lateral podosomal regions. Apodemes 1, 2, sejugal and 3 well visible. Four pairs of setiform, smooth epimeral setae observed; setal formula: 1 –0–1– 2. Setae 3b (12) longer than 1a, 4a and 4b (6-8). Pedotecta II (Pd II) scale-like in lateral view, slightly triangular, rounded distally in ventral view. Discidia (dis) narrowly triangular. Circumpedal carinae (cp) distinct, directed to setae 3b.

Anogenital region. Six pairs of genital (g1, g2, 8-10; g3-g6, 6-8), one pair of aggenital (ag, 6-8), two pairs of anal (an1, an2, 10-12) and three pairs of adanal (ad1-ad3, 12-16) setae thin, smooth. Anterior parts of genital plates with two setae. Adanal setae ad3 inserted laterally or antero-laterally to lyrifissures iad. Postanal porose area oval (16-20 × 6-10).

Legs. Morphology of leg segments, setae and solenidia typical for Pergalumna (see Engelbrecht 1972; Ermilov et al. 2010, 2011, 2014c). 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. Solenidion φ on tibiae IV inserted in the middle of dorsal parts.

Type deposition.

The holotype is deposited in the collection of the Senckenberg Institution Frankfurt, Germany; three paratypes are deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia; one pratype is deposited in the collection of the Natural History Museum, Lima, Peru.

Etymology.

The prefix para is Latin meaning “near” and refers to similarity between the new species and Pergalumna boliviana Ermilov, 2013.

Remarks.

In having the setiform bothridial setae, pointed rostrum, indeveloped anterior notogastral margin, three pairs of porose areas and striate bands on body, Pergalumna paraboliviana sp. n. is most similar to Pergalumna boliviana Ermilov, 2013 from Bolivia (see Ermilov and Niedbała 2013). However, it differs from the latter by the larger body size (531-697 × 365-448 versus 415-464 × 282-332 in Pergalumna boliviana ), elongated, slightly triangular notogastral porose areas A1 (versus rounded in Pergalumna boliviana ) and the presence of interlamellar setae (versus represented by alveoli in Pergalumna boliviana ).