Austrocarabodes longisetosus, Hugo-Coetzee, Elizabeth A., 2011

Hugo-Coetzee, Elizabeth A., 2011, Three new species of Austrocarabodes (Oribatida: Carabodidae) and notes on Austrocarabodes pinnatus Mahunka, 1986, from South Africa, Zootaxa 3011, pp. 1-15: 6-8

publication ID 10.5281/zenodo.202559

persistent identifier

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scientific name

Austrocarabodes longisetosus

sp. nov.

Austrocarabodes longisetosus   sp. nov.

( Figs 5 View FIGURE 5 , 6 View FIGURE 6 )

Colour. Light brown to yellow

Dimensions. Length: females (n = 6) mean 638 μm (range 590–710), males (n = 5) mean 664 μm (range 570– 740). Width: females mean 415 μm (range 380–450), males mean 406 μm (range 330–470). Holotype (male): length 740 μm, width 470 μm.

Prodorsum ( Fig. 5 View FIGURE 5 A). Surface of lamella smooth, prodorsal surface between lamellae with foveolae arranged in rows; rostrum rounded; ro, le, in very long, phylliform, barbed, ending in sharp tips, with strong midribs, ro inserted on tubercle originating on translamella, curving laterally, then inward, tips of le almost touching, in very long (220 μm), almost as long as lamella, curving upwards, outwards and downwards; sensillus with short peduncle, head long, clavate, weakly curving backward, with strong barbs, barbs inconspicuous on posterior side.

Notogaster ( Fig. 5 View FIGURE 5 A). Surface with small foveolae arranged in polygonate pattern, anterior margin convex with irregular edge; notogastral setae long (mean across 14 pairs = 180 μm), narrowly phylliform, tips pointed, serrated, with strong midribs, c 1, dm reaching the alveolus of da, dp respectively; c 1 and c 2 not always directed forward as in holotype, in paratypes curving laterally and backwards.

Coxisternal region ( Fig. 5 View FIGURE 5 B). Surface lightly punctate (punctate in holotype, but in two specimens from near the Tugela River and Mapelane similar ornamentation than the anogenital region); mentum posteriorly with halfcircle formation; apodemes and borders clearly visible; apodeme 4 thick with lighter band in middle; 1 a, 1 c, 2 a, 3 a short, spiniform, smooth, 1 b, 3 b, 4 a, 4 b longer, smooth, 3 c, 4 c long, barbed.

Anogenital region ( Fig. 5 View FIGURE 5 B). Surface with foveolae arranged in rows, foveolae larger in the middle, decreasing in size towards the anterior and posterior regions, punctate next to genital and anal plates; distinct ridge between the genital and anal plates, surface posterior of ridge punctate; genital setae smooth, short, ag setae long, smooth, anal setae short, smooth, ad setae phylliform, similar to notogastral setae but smaller, shorter; lyrifissure iad situated posterio-laterally of ad 3, closer to ad 3 than to lateral margin of ventral plate.

Legs ( Fig. 6 View FIGURE 6 ). Legs similar to legs of A. nortoni   except on average across 4 pairs of legs ± 20 μm shorter; solenidion ω 2 (14 μm) on leg I much shorter than ω 1 (35 μm); paraxial and antiaxial surface of Fe, Tr finely punctate (see Table 1 for setation detail).

Etymology. The species name is derived from the long dorsal setae (longus —long; seta —hair).

Differential diagnosis and remarks. The combination of the very long, barbed dorsal setae, the ornamentation on the notogaster and prodorsum, the form of the sensillus (head long, clavate, bending slightly backward) and the distinct ridge between the genital and anal plates on the ventral side make this species unique.

The above-mentioned characteristics have been observed in other Austrocarabodes   species, although not in combination as is seen in A. longisetosus   . Austrocarabodes curvisetiger   Aoki, 1982, A. elegans Hammer, 1966   , A. bacilliger   and A. patakii   all have very long dorsal setae. However, the setae of A. curvisetiger   are wider with the tips of the setae long and bent. Austrocarabodes elegans   have narrower setae with the tips long and bent. Austrocarabodes bacilliger   has smooth, bacilliform dorsal setae and the setae of A. patakii   are nearly baciliform with small barbs and without midribs. Furthermore, A. haradai   has a similar clavate sensillus which also weakly curves backwards. Austrocarabodes fenestratus ( Wallwork, 1977)   , A. lunaris ( Balogh, 1962)   , A. nodosus Hammer, 1966   and A. sinuosociliatus   have an arched chitinous ridge between the genital and anal plates.

Type material. The holotype (1807.3.1) was sampled in the Royal Natal National Park (28 º 39 ’S, 29 º03’E) in KwaZulu-Natal in soil and plant debris underneath Leucosidea sericea   by C. M. Engelbrecht, 26.i. 1982. Two paratypes (2410.9) are from Nelspruit district (25 º 31 ’S, 31 º02’E) in Mpumalanga, sampled from dry, loamy soil with decomposed plant debris collected by C. M. Engelbrecht, 9.ii. 1982; one paratype (1927.22) is from near the Tugela River between Stanger and Gingingluvu (29 º 10 ’S, 31 º 25 ’E) in KwaZulu-Natal from relatively dry soil and decomposed plant debris collected by C. M. Engelbrecht, 2.viii. 1982. The holotype and paratypes are deposited in the Acarology collection of the National Museum, Bloemfontein, South Africa.

Collection data. Known distribution of A. longisetosus   is indicated by filled triangles on the map of South Africa, Fig. 4 View FIGURE 4 . Abbreviations for provinces: KZN = KwaZulu-Natal; MP = Mpumalanga.

Montrose MP (25 º 27 ’S, 30 º 42 ’E, dry, red, loamy soil with decomposed leaf litter under indigenous trees); Sabie MP (25 º06’S, 30 º 46 ’E, humid soil in dense forest); Mapelane KZN (28 º 25 ’S, 32 º 20 ’E, inland of dunes, natural vegetation); Cape Vidal State Forest KZN (28 º07’S, 32 º 33 ’E, indigenous forest).