Pergalumna ornamenta, Ermilov, Sergey G., Starý, Josef, Sandmann, Dorothee, Marian, Franca & Maraun, Mark, 2013

Ermilov, Sergey G., Starý, Josef, Sandmann, Dorothee, Marian, Franca & Maraun, Mark, 2013, New taxa and new records of oribatid mites of the family Galumnidae (Acari: Oribatida) from Ecuador, Zootaxa 3700 (2), pp. 259-270 : 267-268

Pergalumna ornamenta sp. nov.

( Fig. 4 A–D)

Diagnosis. Body size 282–298 × 199–215. Rostral setae short; lamellar and interlamellar setae minute; sensilli long, with dilated, distally rounded head. Anterior notogastral margin developed. Centro-anterior part of notogaster with specific ornament. Four pairs of porose areas present, Aa transversely oriented, narrow, A1 – A3 rounded or oval. Median pore present. Ventral setae short. Postanal porose area absent.

Description. Measurements. Body length: 298 (holotype), 282 (paratype); notogaster width: 199 (holotype), 215 (paratype).

Integument. Body color brown. Body surface smooth, but centro-anterior part of notogaster with specific ornament (thickened longitudinal line with thin lateral branches; orn).

Prodorsum. Rostrum widely rounded. Rostral setae short (6–8), thin. Lamellar and interlamellar setae minute (both 2). Sensilli (65–69) with long stalk and unilaterally dilated head rounded distally, with indistinct barbs. Exobothridial setae absent. Lamellar and sublamellar lines distinct parallel, lamellar lines stronger than sublamellar lines. Porose areas Ad absent.

Notogaster. Anterior notogastral margin visible but weakly developed. Dorsophragmata small. Notogastral setae represented by 10 pairs of alveoli. Four pairs of porose areas present (Aa transversely oriented, narrow, 18–20 × 4; A1 and A3 rounded, 6–8; A2 very small, 4). Alveoli of setae la inserted latero-posteriorly to Aa. Lyrifissures im located anterio-laterally to A1. Opisthonotal gland openings located laterally to A1. Median pore represented by one large alveolus, located between A1.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae typical for Galumnidae (Engelbrecht 1972 a; Ermilov & Anichkin 2011).

Epimeral and lateral podosomal regions. Four pairs of epimeral setae visible ventrally; 1a, 3b, 4a and 4b short (4), thin, smooth. Discidia triangular, circumpedal carinae distinct.

Anogenital region. Six pairs of genital (except g 1– g 3, 6), one pair of aggenital, two pairs of anal and three pairs of adanal setae similar in length, short (4), thin, smooth. Anterior part of genital plates with three setae. Adanal setae ad 3 inserted laterally to lyrifissures iad. Postanal porose area absent.

Legs. Three claws of each leg smooth; lateral claws thinner than median claw. Morphology of leg segments, setae and solenidia typical for Galumnidae (Engelbrecht 1972 a; Ermilov & Anichkin 2011). Homology of setae and solenidia indicated in Table 1 .

Material examined. Holotype (male) and paratype (male): Ec-2 (01.04.2009).

Type deposition. The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia; paratype is deposited in the collection of the Tyumen State University Museum of Zoology, Tyumen, Russia.

Etymology. The specific name ornamenta refers to the specific notogastral ornamentation.

Remarks. In having the combination of main morphological characters (sensilli with dilated head; prodorsal setae represented by alveoli or short; anterior notogastral margin developed; notogaster with four pairs of porose areas, Aa transversely oriented, elongate), Pergalumna ornamenta sp. nov. is similar to P. silvestris Hammer, 1968 from New Zealand (see Hammer 1968), however it clearly differs from the latter by the presence of notogastral specific ornament (versus absent in P. silvestris ), narrow porose areas Aa (versus wide in P. silvestris ) and the presence of median pore (versus absent in P. silvestris ).

Figures

FIGURE 4. Pergalumna ornamenta sp. nov., adult: A—body dorsally; B—body ventrally (gnathosoma and legs not illustrated); C—prodorsum, pteromorph and anterior part of notogaster dorso-laterally; D—notogaster posteriorly. Scale bar 50 Μm.