Galumna (Galumna) makilingensis, Ermilov, Sergey G., Corpuz-Raros, Leonila & Tolstikov, Andrei V., 2014

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 : 3-4

Taxon classification Animalia Oribatida Galumnidae

Description of Galumna (Galumna) makilingensis sp. n. Figs 1, 2, 3, 4

Diagnosis.

With generic characters of Galumna as summarized by Ermilov et al. (2013). Body size: 647-680 × 498-547. Rostrum pointed. Rostral setae of medium size, ciliate. Lamellar and interlamellar setae long, slightly barbed. Bothridial setae spindle-form. Lamellar lines very strong, divergent in distal parts to sublamellar lines. Anterior notogastral margin developed. Four pairs of porose areas present; Aa boomerang-like, other rounded or oval. Median pore present. Postanal porose area long, elongated.

Description.

Measurements. Body length: 647 (holotype, female), 680 (one paratype, female); notogaster width: 498 (holotype), 547 (one paratype).

Integument. Body color brown. Body surface smooth.

Prodorsum. Rostrum pointed. Rostral setae (ro, 49-57) setiform, ciliate unilaterally. Lamellar (le, 118-127) and interlamellar (in, 172-184) setae setiform, slightly barbed. Bothridial setae (ss, 135-147) spindle-form, with long stalk and short, slightly barbed head. Exobothridial setae and their alveoli absent. Porose areas Ad oval, transversally oriented (24-32 × 6-10). Sublamellar lines (S) distinct, thin, curving backwards. Lamellar lines (L) very strong, parallel in basal parts and divergent in distal parts to sublamellar lines.

Notogaster. Anterior notogastral margin developed. Dorsophragmata (D) of medium size, longitudinally elongated. Notogastral setae represented by 10 pairs of alveoli. Four pairs of porose areas with distinct borders: Aa boomerang-like (90-102 × 8-16), other porose areas rounded or oval; A1 (20-24 × 12-16 or diameter 16-20), A2 (24-32 × 12-16 or diameter 16-20) and A3 (24-45 × 20-24). Alveoli la inserted posteriorly to Aa. Lyrifissures im and opisthonotal gland openings (gla) located laterally to A1. Median pore (mp) present, located little posterior to virtual line connecting porose areas A2.

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 (184 × 155). Subcapitular setae simple, slightly barbed: a (32-36) longer than m and h (both 24-28). Two pairs of adoral setae (20) setiform, barbed. Palps (135-139) with setation 0 –2–1–3– 9(+ω). Solenidion straight, thickened, blunt-ended, attached to eupathidium. Chelicerae (229) with two setiform, barbed setae; cha (57) longer than chb (32). Trägårdh’s organ distinct, tapered.

Epimeral and lateral podosomal regions. Apodemes (1, 2, sejugal, 3) well visible. Four pairs of setiform, slightly barbed epimeral setae present; 1a and 3b (41-49) longer than 4a and 4b (24-32). Pedotecta II rectangular, rounded anteriorly in ventral view. Discidia (dis) rounded distally. Circumpedal carinae (cp) of medium length, directed to 3b.

Anogenital region. Six pairs of genital (g1-g6, 20-24), one pair of aggenital (ag, 20-24), two pairs of anal (an1, an2, 28-32) and three pairs of adanal (ad1-ad3, 28-32) setae setiform, slightly barbed. Anal and adanal setae slightly thicker than genital and aggenital setae. Anterior edge of genital figs with two setae. Adanal setae ad3 inserted laterally to adanal lyrifissures iad. Postanal porose area (Ap) long, elongated, transversally oriented (61-77 × 8-12).

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.

Holotype (female) and one paratype (female): L-45.

Type deposition.

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

Etymology.

The specific name “makilingensis” refers to the type locality, Mt. Makiling, the forest reservation of the University of the Philippines Los Baños.

Comparison.

In having large body size, pointed rostrum, spindle-form bothridial setae, long prodorsal setae, anterior notogastral margin, four pairs of notogastral porose areas, Galumna (Galumna) makilingensis sp. n. is most similar to Galumna (Galumna) tokyoensis Aoki, 1966 from the Palaearctic region (Aoki 1966). However, it clearly differs from the latter by the boomerang-like porose areas Aa and long, elongated postanal porose area (versus both oval in Galumna (Galumna) tokyoensis ), ciliate rostral setae (versus smooth in Galumna (Galumna) tokyoensis ) and interlamellar setae longer than lamellar setae (versus similar in length in Galumna (Galumna) tokyoensis ).

Also, in having large body size, bothridial setae with dilated head, long prodorsal setae, anterior notogastral margin, four pairs of notogastral porose areas, Aa boomerang-like, Galumna (Galumna) makilingensis sp. n. is most similar to Galumna (Galumna) cuneata Aoki, 1961 from the Palaearctic region (Aoki 1961). However, it clearly differs from the latter by the pointed rostrum (versus rounded in Galumna (Galumna) cuneata ), ciliate rostral setae (versus smooth in Galumna (Galumna) cuneata ), interlamellar setae longer than lamellar setae (versus similar in length in Galumna (Galumna) cuneata ) and spindle-form bothridial setae (versus clavate in Galumna (Galumna) cuneata ).