Pergalumna hypergranulosa, Palacios-Vargas, José G. & Villagomez, Fernando, 2017

Palacios-Vargas, José G. & Villagomez, Fernando, 2017, Three new species of Pergalumna (Acari: Oribatida: Galumnidae) from the tropical rainforest of Veracruz, Mexico, Zootaxa 4242 (1), pp. 77-94 : 78-80

Pergalumna hypergranulosa sp. nov.

( Figs. 1 –21)

Description. Measurements in µm, average values in parenthesis. (N=10) Length of males 460–483 (463), width 345–404 (382); length of females 473–503 (483), width 355–364 (360), height of both sexes 370–390 (380). Color coppery brown, slightly lighter in medial prodorsal lenticular region.

Diagnosis. Bothridial setae setiform, with unilateral barbulation; whole body with granulated cerotegument giving a shiny coppery appearance due to the refractivity; all prodorsal setae present; porose area A2 absent; without dorsosejugal suture; lyrifissures iad next to anal plate; porose area postanalis absent.

Prodorsum ( Figs. 1 , 3, 4, 17, 20). Surface densely granulated; subquadrate lenticular region slightly lighter; lamellar lines L and S present; porose area dorsosejugal (Ad) (L=15, W=6) small and oval; prodorsal setae ( Fig. 5 ) setiform and barbed. Interlamellar setae (in) longer than other prodorsal setae (except bothridial seta) and slightly erected (95), lamellar setae (le) intermediate size and faintly curved (78), rostral setae (ro) small, inserted on the edge of ventral plate, erected (51). Bothridial setae (bs) ( Fig. 5 , 20) setiform, long and thin (140), curved with a row of barbulations in the outer margin, without ornamentation. Chelicera (Fig. 7) of normal shape (L=167, W=47), ornamented with punctuations in anterior region, setae cha (47) longer than chb (30), both barbulated.

Notogaster ( Figs. 1 , 15 ). Cerotegument densely granulated (Figs. 9, 21), with irregular ornamentation in the middle area; ten pairs of setae reduced to alveoli. Without medial pore; notogastric porose areas present, except A2.

Porose area Aa elongated (L=29, W=11), la near pteromorph articulation, setae lm located towards the saggital line; porose area A1 elongated, shape and form variable (L=31–50, W=7–12), in certain teratological specimens it can be splitted ( Fig. 1 ), denoting their possible origin as a fusion of A1 and A2; lyrifissure im above opisthonotal gland (gla). Setae h2 posterior of A1, lyrifissures ih and ips surrounding p3. Porose area A 3 in posterior region, smaller than other notogastric porose areas (L=18, W=11), flanked by h1, p1 and p2, lyrifissure ip between p1 and p2.

Pteromorph bilobed (Figs. 10, 18) (L=222, W= 187 in proximal region, 170 in middle and 200 in distal), warty integument, with irregular ornamentations forming thin and thick lines, with central notch; lyrifissure ia below the notch; setae c in habitual position.

Ventral plate (Figs. 2, 16). Integument punctuated, cerotegument densely granulated on whole plate. Subcapitulum (Fig. 6) (L=103, W=108) granulated, setae h short (15); epimeral setae 1b, 3a, 3b y 4a present, short (8), one pair of short aggenital setae (8), three pairs of short adanal setae (8) in habitual position; lyrifissure iad near of anal plate and slightly posterior of adanal setae ad3, porose area postanalis absent (Fig. 8); genital plates (L=87, W=109) ornamented with a pair of longitudinal lines (Fig. 19); six short genital setae present (7) inserted in 2–4 formulae; anal plates (L=70, W=86) granulated, with two pair of short anal setae (6).

Lateral region (Figs. 4, 18). Prodorsum granulated, anterior region with lighter coloration in central part, lamellar lines L and sublamellar lines S present, arched and parallel, near each other. Lamellar setae (le) between lamellar lines L, circumpedal line thick and sclerotized, sharp-pointed rostrum apex.

Legs. Heterotridactylous legs with basal granulation in femora.

Leg setation and solenidia from I–IV (solenidium in parenthesis). Femora 4-4-2-2; genua 3(1)-3(1)-1(1)-2; tibiae 4(2)-4(1)-3(1)-3(1); tarsi 20(2)-15(2)-15-12.

Leg I ( Fig. 11 ). Femora L=112, W=48; genua L=48, W=16; tibiae L=50, W=33; tarsi L=95, W=16. Solenidium σ (128) inserted distally, φ1 (151) and φ2 (70) dorsal. ω1 (47) anterior to ft´´, ω2 (75) posterior.

Famulus (å) very short (3), situated between ω2 and ft´´. Leg II (Fig. 12). Femora L=112, W=39; genua L=37, W=14; tibiae L=48, W=22; tarsi L=63, W=20. Solenidium σ (86), inserted near apex, φ (80) close to marginal zone, dorsal. ω1 and ω2 identical in shape and size (32), blunt apex, between them is situated ft´. Leg III ( Fig. 13 ). Femora L=80, W=44; genua L=20, W= 13; tibiae L=61, W=23; tarsi L=78, W=19. Solenidium σ (36) blunt apex, φ (80) dorsal, to the same height as v´´. Leg IV (Fig. 14). Femora L=94, W=53; genua L=39, W=13; tibiae L=78, W=23; tarsi L=97, W=19. Solenidium φ (102) dorsal and posterior to cuticular fold.

Type material. Holotype (male) mounted on slide. 09/VI/2014, Mexico, Veracruz, Estación de Biología Tropical , Los Tuxtlas, sample of soil and litter, L. Villagomez, A. D. Ruiz y L. A. Martínez col. 18°35’02.04’’ N, 95°04’39.54’’ W. 242 m a.s.l. Three male paratypes on slide with same data except 15/X/2012, 26 more paratypes with 18/IV/2014, 11 on slide (5♀ and 6♂) and fifteen more paratypes from the same locality and same data deposited in 96% ethanol. This material is deposited in the collection of Collembola de México y Ácaros Edáficos of Laboratorio de Ecología y Sistemática de Microartrópodos ( LESM), Facultad de Ciencias , UNAM.

Etymology. The specific name “ hypergranulosa ” refers to heavy integumentary granulation present on the whole body.

Remarks. Due to cerotegumentary granulation, P. hypergranulosa sp. nov. resembles Pergalumna granulatus Balogh & Mahunka, 1967 ( Vietnam) , from which it differs by only unilaterally barbed bothridial setae and a more heaver granulation. Pergalumna elongatiporosa Ermilov et al. 2014 ( Costa Rica), has elongated and folded porose areas A1, giving a horseshoe aspect, while in this new species they are straight. It is also similar to Pergalumna paralongisetosa Ermilov & Kalúz, 2012 (from Ecuador), which shows a granulated cerotegument only on the prodorsum, while the notogaster is smooth; also bothridial setae (bs) are shorter than interlamellar setae (in), adanal setae are extremely long, and there is also a considerable difference in the size of the body (L= 1062–1261, W=713–863 vs. L=470–490, W=350–390). Finally, Pergalumna silvatica Hammer, 1961 ( Peru) also shows a granulated anterior region of the prodorsum, but interlamellar setae in are minute, and there are four pairs of round notogastric porose areas while P. hypergranulosa sp. nov. has only three pairs and all are elongated.

Figures

FIGURES 1 ‾ 4. Pergalumna hypergranulosa sp. nov. 1. Notogaster dorsal view; 2. Ventral plate; 3. Prodorsum; 4. Lateral region, pteromorph and legs omitted. Scale bars 50 µm.

FIGURES 5 ‾ 10. Pergalumna hypergranulosa sp. nov. 5. Prodorsal setae; 6. Subcapitulum, ventral view; 7. Left chelicera, antiaxial view; 8. Posterior region of ventral plate; 9. Structure of cerotegument; 10. Right pteromorph. Scale bars 20 µm.

FIGURES 11 ‾ 12. Pergalumna hypergranulosa sp. nov. 11. Left leg I of holotype, antiaxial view; 12. Right leg II of holotype, paraxial view. Scale bars 20 µm.

FIGURES 13 ‾ 14. Pergalumna hypergranulosa sp. nov. 13. Right leg III of holotype, paraxial view; 14. Right leg IV of holotype, paraxial view. Scale bars 20 µm.

FIGURES 15 ‾ 21. SEM images of Pergalumna hypergranulosa sp. nov. 15. Notogaster and prodorsum, dorsal view; 16. Ventral plate and subcapitulum, ventral view; 17. Rostrum, frontal view; 18. Prodorsum and notogaster, lateral view; 19. Genital plates, showing ornamentation; 20. Bothridial setae bs and interlamellar setae in; 21. Lamellar seta le, showing cerotegument granulation.