Allogalumna dentirostrata, 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 : 883-889

Allogalumna dentirostrata sp. nov.

( Figures 1–3 and 4A–F )

Diagnosis

With typical characters of Allogalumna (lamellar line absent; sublamellar line present; notogastral median pore present; notogastral setae minute or represented by their alveoli); rostrum with three distinct teeth; interlamellar seta long, finely barbed; sensillus medium long, with finely barbed, very slightly dilated head; porose area Aa irregular elongate-oval, obliquely oriented, its lateral part conspicuously widened, but medial part narrowed; A 1 round on dorsal view, but oval in lateral view, A 2 oval, A 3 elongate oval; median pore present; genital plate with longitudinal striations; postanal porose area not evident.

Measurements

Holotype: body length 608 µm; width of notogaster 496 µm; paratypes (n = 3): body length 600–615 (607) µm, width of notogaster 505–530 (520) µm.

Description

Integument. Body colour yellowish-brown. Cuticle of body and legs nearly smooth, with minute granules, gnathosomal and epimeral regions with larger granules; pteromorph with radiated ridges; marginal part of notogaster with transverse ridges; genital plates with longitudinal striations ( Figure 4C and F ).

Prodorsum. Rostrum with three distinct teeth of similar size, clearly seen in dorsofrontal and ventral aspects ( Figures 1D , 2C and 4A ). Rostral seta (ro) thin, 86– 94 µm long, finely barbed, inserted ventrally. Lamellar seta (le) thin, 98–115 µm long, finely barbed. Interlamellar seta (in) thin, 106–124 µm long, finely barbed. Sensillus narrow, 102–115 µm long, with finely barbed, very slightly dilated head ( Figures 1B and 4D ). Lamellar line absent, sublamellar line well developed ( Figures 1A , 2C and 4A ). Dorsosejugal porose area (Ad) elongate oval, located posterior to alveolus of seta in.

Notogaster. Notogaster distinctly widened posteriorly, dorsosejugal furrow well developed, widely arched. Notogastral setae vestigial, 10 pairs of alveoli clearly discernable. Porose area Aa larger than others, irregular elongate-oval, obliquely oriented, its lateral part conspicuously widened, but medial part narrowed; A 1 round on dorsal view, but oval in lateral view, A 2 oval, A 3 elongate oval; centrodorsal

or median pore (mp) present. Lyrifissures ia, im, ih, ip, ips and opisthonotal gland opening (gla) well developed ( Figures 1A, C , 2A, C, D and 4D, E ).

Gnathosoma . Subcapitulum longer than wide, hypostomal setae a, m and h 21–25 µm long, smooth. 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 with few heavily sclerotized blunt teeth on fixed and movable digits; setae cha and chb long, barbed ( Figures 1D , 2B and 4B ).

Epimeral region. Apodemes apo.1, apo.2, apo.sj, apo.3, circumpedal carina and discidium well developed. Six pairs of epimeral setae observed, seta 3a vestigial, other setae well developed, setal formula: 1-0-2-3 ( Figures 1D and 4B ).

Ano-genital region. Anal aperture 143 µm long, 152 µm wide; genital aperture 90 µm long, 106 µm wide, genital plates with longitudinal striations. All ano-genital setae thin, smooth; genital setae (g 1 –g 6) 20–41 µm long, aggenital seta (ag) 25 µm long, anal (an 1, an 2) and adanal setae (ad 1 –ad 3) 20–24 µm long; adanal lyrifissure (iad) situated in paranal position, at level little posterior to seta ad 3 ( Figures 1C, D and 4B ). Postanal porose area not evident.

Legs. All legs with stronger median and slender lateral claws. Structure and setation of legs typical for family as shown in Figure 3 . All setae on podomeres barbed, especially some of ventral setae heavily barbed. 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). Homology of leg setae and solenidia shown in Table 1.

Material examined

Holotype (female): Asram village , Neka, Mazandaran province, Northern Iran, 36° 40 ʹ N, 53°20 ʹ E, 42 m above sea level (a.s.l.), 3 June 2004, Coll. M. A. Akrami; three paratypes (females): same data as holotype. The holotype and paratypes are deposited in the collection of the Department of Plant Protection, College of Agriculture, Shiraz University, Iran.

Remarks

Allogalumna dentirostrata sp. nov. is easily distinguishable from other known species of the genus by the combination of the following characters, namely: very narrow, slightly dilated sensillus; irregular elongate-oval porose area Aa; ridges on pteromorph and marginal part of notogaster; dentations of rostrum; longitudinal striations on genital plate and long interlamellar seta.

The Turkish species, Allogalumna turkeyensis described by Grobler et al. (2004) resembles the new species in slightly dilated sensillus. However, the former species is distinguished from the present new species by the shorter, but thicker interlamellar seta, not reaching the tip of rostrum as opposed to relatively long and thin interlamellar seta in the new species; round shape of porose area Aa rather than irregular elongate-oval porose area in the new species; incomplete dorsosejugal furrow in contrast to well-developed dorsosejugal furrow in the new species; smoothly rounded rostrum as opposed to the rostrum with dentation, and smooth genital plate rather than striated genital plate in the new species.

The European species, Allogalumna alamellae described by Jacot (1935) and redescribed by Pérez-Iñigo (1972) and Weigmann (2006) is different from the new species in the swollen head of the sensillus; incomplete dorsosejugal furrow; round or slightly oval porose area Aa; smooth pteromorph and much smaller body size.

Etymology

The specific epithet “ dentirostrata ” refers to the rostrum with distinct teeth in the new species.

Ecology

This species is an inhabitant of the lowland pasture soil, and it was found in sheep faeces.

Figures

Figure 1. Allogalumna dentirostrata sp. nov. (A) Dorsal view of idiosoma; (B) sensillus and bothridium; (C) posteroventral view of opisthonotum; (D) gnathosomal, epimeral and genital regions, partial.

Figure 2. Allogalumna dentirostrata sp. nov. (A) Prodorsum and anterior part of notogaster, showing variation of porose area Aa; (B) chelicera, left, antiaxial view (only tip is shown); (C) dorsofrontal view of prodorsum; (D) lateral view of notogaster.

Figure 3. Allogalumna dentirostrata sp. nov. (A) Leg I, right, antiaxial view; (B) leg II, left, antiaxial view; (C) leg III, right, antiaxial view; (D) leg IV, right, antiaxial view. Trochanters are not illustrated in A, B and C.

Figure 4. Morphological characters of different species. (A–F) Allogalumna dentirostrata sp. nov. (A) Anterior part of prodorsum; (B) gnathosomal, epimeral and genital regions; (C) pteromorph showing ridges on its cuticle; (D) left side of humeral region; (E) porose area Aa; (F) transversal ridges on notogastral margin. (G–J) Acrogalumna lanceolata sp. nov. (G) Rorstrum (arrow indicates central carina); (H) humeral region; (I) pteromorph; (J) porose areas, lyrifussure and opisthonotal gland opening. (K–N) Galumna triangulata sp. nov. (K) Lateral view of prodorsum; (L) lateral view of pteromorph and part of notogaster, showing transversal ridges; (M) rostrum (arrow indicates central carina); (N) lateral view of sensillus.