Zygoribatula prima, Ermilov & Anichkin, 2011

Ermilov, S. G. & Anichkin, A. E., 2011, TWO NEW SPECIES OF ORIPODOIDEA (ACARI: ORIBATIDA) FROM VIETNAM Sergey G. E and Alexander E. A, Acarologia 51 (2), pp. 143-154 : 148-152

Zygoribatula prima n. sp.

( Figures 4 – 6 )

With characters of Zygoribatula as summarized by Balogh and Balogh (1984, 1992), Grobler (1993), Weigmann (2006).

Diagnosis

This species is characterized by the following combination of character states: body size 332 – 431 x 199 – 282; notogaster with pair of longitudinal striate bands (each more than half length of notogaster, running from humeral region almost to seta dp, lateral to setae da and dm); anogenital region foveolate; rostrum pointed in dorsoventral view; translamella straight or slightly convex in median part; rostral, lamellar and interlamellar setae setiform, barbed; sensilli clavate, head barbed; 14 pairs of setiform, barbed notogastral setae (setae c 2, da and la longest); areae porosae Aa oblong, A1 oblong or rounded, A2 and A3 rounded.

Description

Measurements — Body length 415 (holotype), 332 – 431 (mean 381, four paratypes); body width 282 (holotype), 199 – 282 (mean 244, four paratypes).

Integument — Body color brown. Notogaster with pair of longitudinal striate bands (each more than half length of notogaster, running from humeral region almost to seta dp, lateral to setae da and dm). Anogenital region foveolate (well visible under high magnification); foveolae rounded (up to 4 in diameter).

Prodorsum — ( Figure 4A ; Figure 5A–E ). Rostrum pointed in dorsoventral view. Lamellae slightly longer than half of prodorsum. Translamella straight or slightly convex in median part. Rostral (45 – 53), lamellar (65 – 82) and interlamellar (65 – 82) setae setiform, barbed. Exobothridial setae (24) setiform, thin, barbed. Sensilli (40 – 50) with shorter stalk (16 – 20) and longer head (24 – 30), rounded distally, barbed.

Notogaster — ( Figure 4A ; Figure 5F–M ). Dorsosejugal suture complete, convex. Humeral projections slightly developed. Fourteen pairs of setiform, barbed notogastral setae. Setae c 2, da and la longest (36 – 41), setae dm and lm little shorter (28 – 36), setae dp, lp, h 1, h 2 and h 3 short (16 – 20), setae p 1, p 2 and p 3 shortest (12 – 16). Four pairs of areae porosae developed dorsally: Aa oblong (14 – 20 x 6 – 8); A1 oblong (12 – 14 x 6 – 8) or round (diameter 8 – 10); A2 and A3 rounded (diameter 6 – 10).Opisthonotal gland opening and lyrifissures developed in typical arrangement for genus.

Lateral part of body — ( Figure 5A ). Tutorium long. Sublamellar line well-developed. Sublamellar areae porosae rounded (4 – 6), areae porosae Ah oblong (12 – 20 x 4 – 6). Pedotecta I and II small. Discidia triangular.

Anogenital region — ( Figure 4B ; Figure 5N, O ). Two pairs anal (4 – 8), three pairs adanal (8 – 12), one pair aggenital (ag, 4 – 6) and four pairs of genital setae (4 – 8) setiform, slightly barbed. Lyrifissures iad in preanal position.

Acarologia 51(2): 143–154 (2011)

Epimeral region ( Figure 4B ). Apodemes 2, sejugal, 3 and circumpedal carina well-developed. All epimeral setae setiform, slightly barbed. Setae 1c longest (20 – 24), other setae shorter (8 – 16).

Gnathosoma — ( Figure 6A–C ). Subcapitulum longer than wide: 86 x 71. Hypostomal setae setiform, barbed, h (24 – 32) slightly longer than a and m (20 – 28). Lateral lips with two pairs of adoral setae (8 – 12), setiform, barbed. Palps (length 53) with setation 0-2-1-3-9(+1 ω). All setae (except some on tarsi) barbed. Chelicerae (length 94) chelatedentate; cheliceral setae setiform, barbed, cha (32) longer than chb (20).

Legs — ( Figure 6D, E ). Morphology similar to that in other species of Zygoribatula ( Grobler 1993; Bayartogtokh and Smelyansky 2008). Tarsi with three simple claws, median claw obviously thicker than lateral claws. Formulae of leg setation and solenidia: I (1-5(4)-3-4-19) [1-2-2], II (1-5-2-4-15) [1- 1-2], III (2-3-1-3-15) [1-1-0], IV (1-2-2-3-12) [0-1-0]; homology of setae and solenidia indicated in Table 2. Setae l” on femora I absent from some specimens. All setae barbed or with short cilia. Famulus short, straight, blunt-ended. Solenidia ω 1 on tarsi I, ω 1 and ω 2 on tarsi II, σ on genua III rod-shaped; other solenidia setiform.

Material examined — Holotype (female), paratypes (four specimens: two females and two males) were obtained from southern Vietnam, 11°25’ N, 107°25’ E, Cat Tien National Park , 149 m above sea level, in dark loamy soil of Lagerstroemia forest, February-March 2009, collected by A.E. Anichkin.

Type deposition — The holotype is deposited in the collection of the Zoological Institute of the Russian Academy of Sciences, St. Petersburg, Russia ; two paratypes are in the collection of the Center for Biodiversity Resources Education and Development (CEBRED), Hanoi National University of Education , Hanoi, Vietnam ; two paratypes are in the personal collection of the first author ( Center of Independent Examinations –NN, Nizhniy Novgorod, Russia) .

Etymology — The specific name " prima " refers to the first identified species of Zygoribatula recorded for Vietnam.

Distribution — At present, this species is known only from Cat Tien National Park of southern Vietnam.

Comparison — Zygoribatula prima n. sp. can be included in the Zygoribatula species group having a striate notogaster ( Z. arcuatissima Berlese, 1916 from Holarctic region, Z. connexa Berlese, 1904 from subtropical region, Z. dactylaris Subías, Ruiz and Kahwash, 1990 from western Mediterranean region, Z. exarata Berlese, 1916 from southern Palearctic region, Z. galula Mahunka, 2001 from Kenya, Z. guadarramica PØrez-˝aeigo, 1978 from Spain, Z. hailongensis Wen and Zhang, 1988 from China, Z. longilinea Wang and Li, 1997 from China, Z. sabulosa Balogh, 1966 from Chad, Z. salina Balogh, 1966 from Ethiopian region, Z. sayedi Elbadry and Nasr, 1974 from Egypt, Z. sculpturata ( Mahunka, 1989) from Kenya, Z. smirnovi Bulanova-Zakhvatkina, 1978 from eastern Mediterranean region, Z. socotrensis Mahunka, 2000 from Yemen, Z. tritici Elbadry and Nasr, 1974 from Egypt, Z. vanharteni Mahunka, 2000 from Yemen). However, it clearly differs from others in this group by the distribution of striae; the cuticle is smooth except for a pair of long, narrow bands of striation. In other species, the notogaster is covered completely by striae or they exist only in the humeral regions.

Figures

FIGURE 4: Zygoribatula prima n. sp. A – dorsal view, legs removed; B – ventral view, legs and gnathosoma removed. Scale bar 100 µm.

FIGURE 5: Zygoribatula prima n. sp. A – lateral view of prodorsum, legs, gnathosoma and epimeral setae removed; B – rostrum; C – rostral setae; D – lamellar seta; E – sensillus; F – notogastral seta c1; G – notogastral seta c2; H – notogastral seta lm; I – notogastral seta h3; J – area porosa Aa; K – area porosa A1 (oblong form); L – area porosa A1 (round form); M – area porosa A2; N – genital plate, left; O – anal plate, left. Scale bar (A) 100 µm, scale bar (J+K+L+M) 10 µm, scale bars (B, C+D, E+F+G+H+I, N+O) 20 µm.

FIGURE 6: Zygoribatula prima n. sp. A – subcapitulum; B – palp; C – chelicera; D – leg I, right, antiaxial view; E – leg IV, left, antiaxial view. Scale bars 20 µm.