Galumna (Galumna) crenata Deb & Raychaudhuri, 1975

Ermilov, Sergey G., Corpuz-Raros, Leonila & Tolstikov, Andrei V., 2014, The oribatid mite subgenus Galumna (Galumna) (Acari, Oribatida, Galumnidae) in the Philippines, ZooKeys 452, pp. 1-13 : 5-8

Taxon classification Animalia Oribatida Galumnidae

Supplementary description of Galumna (Galumna) crenata Deb & Raychaudhuri, 1975 Figs 5, 6, 7, 8

Description.

Measurements. Body length: 348-390 (four specimens, two females and two males); notogaster width: 258-290 (four specimens).

Integument. Body color brown. Body surface smooth, but ventral side covered by the microgranular cerotegument (diameter of granules less than 1), visible only under high magnification ( × 1000) in dissected specimens. Genital figs with one longitudinal stria in medial parts.

Prodorsum. Rostrum rounded. Rostral setae (24-32) setiform, smooth. Lamellar and interlamellar setae minute (both 6-8), thin, smooth. Bothridial setae (49-57) clavate, with long stalk and shorter, rounded and weakly barbed distally head. Exobothridial setae and their alveoli absent. Porose areas Ad large, oval, transversally oriented (20-22 × 6-8). Lamellar and sublamellar lines distinct, thin, parallel, curving backwards.

Notogaster. Anterior notogastral margin developed, but sometimes poorly visible. Dorsophragmata of medium size, longitudinally elongated. Notogastral setae represented by 10 pairs of alveoli. Four pairs of porose areas with distinct borders: Aa large, boot-shaped or weakly triangular, transversally oriented (32-36 × 12-16); A1, A2 (diameter of both 8-16) and A3 (diameter of 14-20) rounded. Alveoli la inserted posteriorly to Aa. Lyrifissures im located between lm and lp. Opisthonotal gland openings located laterally to A1. Median pore present, located little anterior to virtual line connecting porose areas A3.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae generally typical for species of the subgenus Galumna (Galumna) (for example, Engelbrecht 1969; Ermilov and Anichkin 2011; Ermilov et al. 2011). Subcapitulum longer than wide (90-94 × 82-68). Subcapitular setae simple, smooth: a (14-16) longer and thicker than m and h (both 6-8). Two pairs of adoral setae (8) setiform, slightly barbed. Palps (57) with setation 0 –2–1–3– 9(+ω). Solenidion straight, thickened, blunt-ended, attached to eupathidium. Chelicerae (106-110) with two setiform, barbed setae; cha (36) longer than chb (20). Trägårdh’s organ distinct, tapered.

Epimeral and lateral podosomal regions. Anterior tectum of epimere I with numerous rectangular teeth. Apodemes (1, 2, sejugal, 3) well visible. Six pairs of thin, smooth epimeral setae (8-12) present. Setae 4c inserted on tubercle. Pedotecta II rectangular, rounded anteriorly in ventral view. Discidia triangular. Circumpedal carinae long, directed to pedotecta I.

Anogenital region. Six pairs of genital setae (g1, g2, 8, g3-g6, 4-6), one pair of aggenital (ag, 6-8), two pairs of anal (an1, an2, 8) and three pairs of adanal (ad1-ad3, 8) setae thin, smooth. Anterior edge of genital figs with two setae. Adanal setae ad3 inserted laterally to adanal lyrifissures iad. Postanal porose area oval, transversally oriented (12-20 × 6-8).

Legs. Morphology of leg segments, setae and solenidia generally typical for species of the subgenus Galumna (Galumna) (for example, Engelbrecht 1969; Ermilov and Anichkin 2011; Ermilov et al. 2011; Bayartogtokh and Akrami 2014). Formulae 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.

Material examined.

Four specimens (two females and two males): L-1.

Remarks.

Galumna (Galumna) crenata distinctly differs from other species of the sugenus by the presence of dentate anterior tectum of epimere I. The available Philippine specimens of this species are morphologically and in general appearance similar to the Indian specimens (Deb and Raychaudhuri, 1975). Three main differences are as follows:

Body longer (348-390 versus 319-325 in Indian specimens). We believe these differences represent intraspecific (perhaps geographical) variability.

Anterior notogastral margin is well visible (versus completely absent in Indian specimens); also, the text of other paper ( Sarkar et al. 2007) on Galumna (Galumna) crenata assert that it is present.

Rostral, lamellar and interlamellar setae developed (versus absent in Indian specimens). We believe these differences can be erroneous. The reason is that Deb and Raychaudhuri (1975) inadequately described this species and, probably, they overlooked these setae, because the rostral setae are usually strongly pressed to the prodorsum surface and are often not visible in dorsal and ventral views, and the lamellar and interlamellar setae are minute, well visible only under high magnification.