Allogalumna monodactyla Ermilov & Anichkin

Ermilov, Sergey G. & Anichkin, Alexander E., 2014, Two new species of oribatid mites of the family Galumnidae (Acari, Oribatida) from Vietnam, ZooKeys 382, pp. 53-66 : 55-57

Allogalumna monodactyla Ermilov & Anichkin sp. n. Figs 1-6

Diagnosis.

Body size 180-188 × 114-123. Body and legs covered by the microgranular cerotegument. Rostral, lamellar and interlamellar setae minute; lamellar setae little longer. Sensilli with disk-like head, having seven cilia. Anterior notogastral margin not developed. Four pairs of porose areas small, rounded, punctiform. Median pore located in centrodorsal part of notogaster. Postanal porose area absent. Legs monodactylous.

Description.

Measurements. Small species. Body length: 188 (holotype), 180, 184 (two paratypes); notogaster width: 123 (holotype), 114, 118 (two paratypes).

Integument. Body color yellowish-brown to brown. Body and legs covered by the microgranular cerotegument. Granules (up to 1) visible only under high magnification. Body surface smooth. Pteromorphs with distinct radiate wrinkles.

Prodorsum. Rostrum widely rounded. Rostral (ro, 2), lamellar (le, 4) and interlamellar (in, 2) setae thin, smooth. Sensilli (ss, 24-28) with short stalk and well-developed disk-like head, having seven cilia (all inserted in one row) of medium size. Exobothridial setae absent. Sublamellar lines (S) distinct, typical for Allogalumna : long, curving backwards. Porose areas Ad not founded.

Notogaster. Anterior notogastral margin not developed. Dorsophragmata absent. Notogastral setae represented by 10 pairs of alveoli. Four pairs of porose areas small, round (Aa, 4-6; A1-A3, 4), poorly visible, punctiform, without distinct borders. Alveoli of setae la inserted latero-posteriorly to Aa. Lyrifissures im located between lm and lp. Opisthonotal gland openings not evident. Median pore (mp) present in all specimens, located in centrodorsal part of notogaster between the virtual lines connecting lm and lm, lp and lp.

Gnathosoma. Morphology of subcapitulum, palps and chelicerae typical for most Galumnidae (for example: Ermilov and Anichkin 2010, 2011a, 2013b; Ermilov et al. 2011, 2013a). Subcapitular setae h minute (4), thin, smooth.

Epimeral and lateral podosomal regions. Apodemes (1, 2 sejugal, 3) well visible. Four pairs of epimeral setae observed ventrally; 1a, 3a, 3b, 4a short (4), thin, smooth. Discidia (dis) triangular, circumpedal carinae (cp) distinct.

Anogenital region. Six pairs of genital (g1-g6), one pair of aggenital (ag), two pairs of anal (an1, an2) and three pairs of adanal (ad1-ad3) setae little differs in size, minute (3-4), thin, smooth. Anterior edge of genital plates with two setae. Adanal setae ad3 inserted laterally to adanal lyrifissures iad. Postanal porose area absent.

Legs. Monodactylous; claw of each leg smooth. Morphology of leg segments, setae and solenidia typical for most Galumnidae (for example: Ermilov and Anichkin 2010, 2011a, 2013b; Ermilov et al. 2010, 2011), but solenidion of genua III weakly dilated in medial part. 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.

Type deposition.

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

Etymology.

The specific name “monodactyla” refers to the monodactylous legs of the new species.

Comparison.

Allogalumna monodactyla sp. n. differs from other known species of the genus Allogalumna by the median pore located in centrodorsal part of notogaster (versus in posterior part) and monodactylous legs (versus tridactylous).