Galumna (Galumna) parazeucta, Ermilov & Friedrich, 2016

Ermilov, S. G. & Friedrich, S., 2016, New species and records of Galumna (Acari, Oribatida, Galumnidae) from Peru, Acarologia 56 (2), pp. 183-193 : 184-187

Galumna (Galumna) parazeucta n. sp.

( Figures 1-2 )

Diagnosis — Body size: 514 – 597 × 365 – 415. Body surface striate. Rostral, lamellar and interlamellar setae long, barbed. Bothridial setae lanceolate, stalk smooth, head with minute barbs. Anterior notogastral margin developed. Four pairs of notogastral porose areas present, Aa elongated longitudinally, A1 rounded, A2 oval, A3 elongated transversely. Median pore and postanal porose area present. Genital and aggenital setae longer than anal and adanal setae.

Description — Measurements – Body of medium size: length 514 (holotype: male), 531, 597 (two paratypes: both males); notogastral width 365 (holotype), 398, 415 (two paratypes).

Integument — Body brown, covered by dense microgranular cerotegument (diameter of granules less than 1). Surface of dorsal and ventral sides, pteromorphs and subcapitular mentum striate; striae of anogenital region and median part of epimeral region short, those of other body regions long.

Prodorsum — Rostrum broadly rounded. Lamellar (L) and sublamellar (S) lines parallel, curving backwards; L thickened, but not costula-like, S thin. Rostral (ro, 57 – 61), lamellar (le, 69 – 77) and interlamellar (in, 82 – 90) setae setiform, barbed; ro and le directed antero-medially, in — upwards erect. Bothridial setae (bs, 106 – 118) with long, smooth stalk; head short, lanceolate, with minute barbs. Exobothridial setae and their alveoli absent. Porose areas Ad oval, transversely oriented (36 – 38 × 8 – 10).

Notogaster — Anterior notogastral margin developed. Dorsophragmata (D) of medium size, elongated longitudinally. Four pairs of porose areas (Aa, A1, A2, A3) with distinct borders: Aa narrowly triangular (length 82 – 94), elongated, located parallel to and near hinge; A1 rounded (12 – 16), A2 oval (16 – 20 × 8 – 12), A3 elongated (73 – 86 × 8 – 16), transversely oriented. Notogastral setae represented by 10 pairs of alveoli, la located medial to Aa, h 3 – antero-lateral to A1. Median pore present, located posterior to virtual line connecting porose areas A2. All lyrifissures (ia, im, ip, ih, ips) distinct, im and opisthonotal gland openings (gla) located antero-lateral to A2.

Gnathosoma — Morphology of subcapitulum, palps and chelicerae typical for Galumna (Galumna) (e.g. Engelbrecht 1969; Ermilov and Anichkin 2010). Subcapitulum size: 127 – 139 × 118 – 127. Subcapitular setae setiform, indistinctly barbed, h (20) longer than a (16) and m (16); a thickest. Two pairs of adoral setae (12) setiform, barbed. Length of palps: 102 – 110. Axillary sacculi (sac) distinct, slightly elon- gated. Length of chelicerae: 143 – 151. Cheliceral setae setiform, barbed, cha (61 – 65) longer than chb (32 – 36).

Epimeral and lateral podosomal regions — An- terior tectum of epimere I smooth. Epimeral setal formula: 1-0-1-2; setae thin, barbed, 1b and 3b (45 – 53) longer than 4a and 4b (32 – 36). Pedotecta II trapezoid, rounded distally in ventral view. Dis- cidia sharply triangular. Circumpedal carinae (cp) directed to pedotecta I.

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Anogenital region — Six pairs of genital (g 1- g 6, 20 – 24), one pair of aggenital (ag, 20 – 24), two pairs of anal (an 1, an 2, 10) and three pairs of adanal (ad 1- ad 3, 10) setae thin, indistinctly barbed; g 1- g 2 on anterior edge of genital plate. Adanal lyrifissures (iad) located close and parallel to anal plates. Setae ad3 inserted lateral to iad. Postanal porose area elon- gated, transversely oriented (86 – 98 × 12 – 16).

Legs — Morphology of leg segments, setae and solenidia typical for Galumna (Galumna) (e.g. Engel- brecht 1969; Ermilov and Anichkin 2010). Median claw slightly thicker than laterals, all indistinctly serrate on dorsal side. 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]; ho- mology of setae and solenidia indicated in Table 1 . Solenidion ’ of tibiae IV inserted dorsally at about 2/3 length of segment.

Material examined — Holotype (male) and two paratypes (both males): see "Material and methods" section.

Type deposition — The holotype is deposited in the collection of the Museo de Historia Natural , Universidad Nacional Mayor de San Marcos, Lima, Peru ; two paratypes are deposited in the collection of the Tyumen State University Museum of Zool- ogy, Tyumen, Russia Etymology — The specific name parazeucta refers to the similarity between the new species and the species Erogalumna zeucta Grandjean, 1964 .

Remarks — The new species is morphologi- cally most similar to Galumna (Galumna) neonominata Subías 2004 (= Galumna clavata PØrez-˝aeigo and Baggio 1991)1 from Brazil (see PØrez-˝aeigo and Baggio 1991) and G. (Galumna) pterolineata Hammer, 1972 from Tahiti (see Hammer 1972) in having a striate body surface. However, it differs from both by the presence of strongly elongated (vs. oval) noto- gastral porose areas Aa and A3.

The new species also is morphologically similar to Erogalumna zeucta Grandjean, 1964 from the Neotropical region (see Grandjean 1964, 1966) in the striate body surface, relatively long prodorsal setae, bothridial setae with small head, well-developed anterior notogastral margin, presence of a postanal porose area and four pairs of notogastral porose ar- eas and the position of setal alveoli la medial to ar- eas Aa. It differs from E. zeucta by the absence of modified leg setae in males (vs. present; this is a generic character of Erogalumna ) and the presence of strongly elongated postanal porose area and notogastral porose areas Aa and A3 (vs. Aa slightly elongated, A3 oval).

Figures

FIGURE 1: Galumna (Galumna) parazeucta n. sp.: A – dorsal view; B – anterior part of body, lateral view (gnathosoma and legs not illustrated). Scale bar 200 µm.

FIGURE 2: Galumna (Galumna) parazeucta n. sp.: A – ventral view (gnathosoma and legs except basal parts IV not illustrated); B – posterior view. Scale bar 200 µm.