Galumna granulimorpha, Bayartogtokh & Akrami, 2014

Bayartogtokh, Badamdorj & Akrami, Mohammad Ali, 2014, The soil mite family Galumnidae of Iran (Acari: Oribatida), Journal of Natural History 48 (15), pp. 881-917 : 897-901

Galumna granulimorpha sp. nov.

( Figures 8 and 9A–D )

Diagnosis

With typical characters of Galumna ; rostrum with incision forming triangular central carina and slightly larger lateral carina with subtriangular shape; rostral and lamellar setae thin, finely barbed; interlamellar seta long, thin, finely barbed; sensillus medium long, with finely barbed, distally pointed fusiform head; porose area Aa nearly round or slightly oval, A 1 and A 2 smallest, nearly round, subequal in size, A 3 elongate oval; median pore absent in male, but present in female; postanal porose area large, elongate oval.

Measurements

Holotype: body length 496 µm, width of notogaster 398 µm; paratype: body length 495 µm, width of notogaster 380 µm.

Description

Integument. Body colour yellowish brown. Cuticle of body and legs with minute granules; notogaster with few microtubercles, especially female with larger tubercles on humeral region; epimeral region with small granules, sejugal area with faint longitudinal striations; pteromorph with large granules.

Prodorsum. Rostrum with small triangular central carina and slightly larger lateral carina with subtriangular shape, well seen in dorsofrontal view ( Figures 8B and 9A ). Rostral seta thin, 52–59 µm long, finely barbed, inserted ventrally and well visible in dorsofrontal view. Lamellar seta thin, 62–73 µm long, finely barbed. Interlamellar seta thin, 64–75 µm long, finely barbed ( Figure 8A and B ). Sensillus 106–114 µm long, with thin stalk and finely barbed fusiform head distally pointed ( Figures 8A and C and 9B ). Lamellar and sublamellar lines well developed ( Figure 8A and B ). Dorsosejugal porose area large, oval, located posterolaterad of seta in.

Notogaster. Notogaster slightly widened posteriorly, dorsosejugal furrow well developed, widely rounded. Pteromorph with radiated granules ( Figures 8A and 9C ). Notogastral setae vestigial, their alveoli clearly discernable. Porose area Aa nearly round or slightly oval, but that of a female paratype was more elongate triangular; A 1 and A 2 smallest, nearly round, subequal in size, A 3 elongate oval poorly visible ( Figures 8E and 9D ); median pore absent in male, but present in female. Lyrifissures ia, im, ih, ip, ips and opisthonotal gland opening well developed ( Figure 8A and E ).

Gnathosoma . Subcapitulum longer than wide, with few microtubercles; hypostomal setae a, m and h 9–12 µm long, smooth ( Figure 8D ). Palp typical for family as shown in Pergalumna iunctiporosa sp. nov., all setae except on tarsus finely barbed, formula of setation: 0-2-1-3-10 including solenidion ω on tarsus. Chelicera same as in Allogalumna dentirostrata sp. nov., with few heavily sclerotized blunt teeth on fixed

and movable digits; setae cha and chb long, barbed; Trägårdh’ s organ well developed, its proximal part clearly discernable.

Epimeral region. With small granules and faint striations on sejugal area; apodemes apo.1, apo.2, apo.sj, apo.3, circumpedal carina and discidium well developed. Only four pairs of epimeral setae of 4–6 µm length observed, setal formula: 1-0-2-1 ( Figure 8D ).

Ano-genital region. Anal aperture 95 µm long, 104 µm wide; genital aperture 66 µm long, 73 µm wide for holotype. All ano-genital setae well developed, thin, smooth; genital setae 10–16 µm long, aggenital seta 8–11 µm long; anal and adanal setae 4–8 µm long; adanal lyrifissure (iad) situated in paranal position, at level anterior to seta ad 3 ( Figure 8D ). Postanal porose area large, elongate oval ( Figures 8E and 9D ).

Legs. Structure and setation of legs typical for family as shown in the description of Allogalumna dentirostrata sp. nov. Formula of setation, including famulus: I (1-4-3-4- 20), II (1-4-3-4-15), III (1-2-1-3-15), IV (1-2-2-3-12), formula of solenidia I (1-2-2), II (1-1-2), III (1-1-0), IV (0-1-0).

Material examined

Holotype (male): Nowshahr, Mazandaran province, Northern Iran, 36°39 ʹ N, 51° 30 ʹ E, 19 m a.s.l., 4 June 2004, Coll. M. A. Akrami; one paratype (female): same data as holotype. The holotype and a paratype are deposited in the collection of the Department of Plant Protection , College of Agriculture, Shiraz University, Iran.

Remarks

Galumna granulimorpha sp. nov. is unique among the other known species of Galumna in the combination of the following characters, namely: rostrum with incision forming triangular central carina and two slightly larger lateral carina; narrow fusiform sensillus; granular structure of pteromorph, and different structure of notogastral porose areas.

Among the known species of Galumna , the following Palaearctic species, Galumna tarsipennata Oudemans, 1914 , Galumna gibbula Grandjean, 1956 , Galumna lanceata Oudemans, 1900 , Galumna europea (Berlese, 1914) and Galumna dimorpha Krivolutskaja, 1952 resemble the new species in the structure of fusiform sensillus. However, G. tarsipennata , G. gibbula and G. lanceata differ from the present new species in the smoothly rounded rostrum and interrupted dorsosejugal furrow. Only the Mediterranean species, G. gibbula has rostrum with a pair of small lateral carina, but the median part of rostrum is rounded.

The other Palaearctic species, G. europea is distinguishable from the present new species by the oval shape of porose areas Aa and A 2; nearly smooth prodorsal setae and pteromorph, and larger body size. Galumna dimorpha differs from the present new species in the smoothly rounded rostrum; much narrower and smooth rostral, lamellar and interlamellar setae; smooth pteromorph; presence of notogastral median pore in both sexes, and far larger body size.

Etymology

The specific epithet “ granulimorpha ” refers to the granulated pteromorphs in this species.

Ecology

This species is an inhabitant of the mosses and litter of forest.

Figures

Figure 8. Galumna granulimorpha sp. nov. (A) Dorsal view of idiosoma; (B) dorsofrontal view of prodorsum, partial; (C) lateral view of sensillus; (D) ventral view of idiosoma; (E) posterior view of opisthonotum.

Figure 9. Morphological characters of different species. (A–D) Galumna granulimorpha sp. nov. (A) Rostrum (arrow indicates central carina); (B) lateral view of sensillus; (C) pteromorph; (D) porose areas A3 and Ap. (E–H) Pergalumna iunctiporosa sp. nov. (E) Rostrum (arrow indicates central carina); (F) pteromorph; (G) porose areas, lyrifussure and opisthonotal gland opening; (H) dorsolateral view of sensillus.