Austrocarabodes crassimarginatus, 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: 9-10

publication ID 10.5281/zenodo.202559


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scientific name

Austrocarabodes crassimarginatus

sp. nov.

Austrocarabodes crassimarginatus   sp. nov.

( Fig. 7 View FIGURE 7 )

Colour. Brown to light brown

Dimensions. Length: females (n = 6) mean 572 μm (range 550–590), males (n = 6) mean 468 μm (range 440– 510). Width: females mean 363 μm (range 330–380), males mean 283 μm (range 270–310). Holotype (female): length 555 μm, width 370 μm.

Prodorsum ( Fig. 7 View FIGURE 7 A). Surface of lamella and surface between lamellae punctate; rostrum rounded; ro on tubercles originating on translamella, ro curving forwards with distal end curving downwards, ro, le, in phylliform, serrated, with two strong midribs, ro, le ending pointedly, in ending broadly, directed forwards and slightly laterally, longest and largest seta on prodorsum, ss with long peduncle, head thickened, bending downwards, spiculate, bothridium with vertical lines.

Notogaster ( Fig. 7 View FIGURE 7 A). Surface foveolate with foveolae in rows of two or three, between rows large squarelike spaces in which surface is lightly punctate; notogastral setae with thick edges, strongly thickened midribs, ending broadly, serrated.

Coxisternal region ( Fig. 7 View FIGURE 7 B). Surface punctate; apodemes and borders clearly visible; 1 a, 1 c, 2 a, 3 a very short, but clearly visible, spiniform, 1 b, 3 b, 3 c, 4 a, 4 b, 4 c long, smooth.

Anogenital region ( Fig. 7 View FIGURE 7 B). Surface and genital plate surface punctate, anal plates weakly rugulose; ridge extending laterally from genital plates towards anal plates and from anal plates towards genital plates, but not meeting; genital setae spiniform, smooth, ag seta smooth, longer than genital setae, anal setae slightly phylliform with midrib (clearly seen in 100 x magnification), weakly serrated, ad setae phylliform with midrib, ending broadly, similar to notogastral setae but smaller; iad situated posterio-laterally to ad 3, closer to the seta than to the lateral margin of ventral plate.

Legs. Legs similar to legs of A. nortoni   except on average across 4 pairs of legs ± 100 μm shorter and seta v’ on Tr I shorter (see Table 1 for setation detail).

Etymology. The species name is derived from the thick-edged dorsal setae (crassus —thick, marginatus —margin).

Differential diagnosis and remarks. The most important diagnostic characteristics of A. crassimarginatus   are the notogastral surface ornamentation (foveolate, foveolae arranged in rows with square-like spaces between rows), the form of the interlamellar setae (large, directed forward and slightly laterally), the form of the sensillus (spiculate, thickened head, bending slightly downwards), the form of the notogastral setae (ending broadly, thickened edges) and the form of the anal setae (slightly phylliform with midribs).

The above-mentioned characteristics have been observed in other Austrocarabodes   species. Austrocarabodes gressitti Balogh & Mahunka, 1978   has similar ornamentation. Species with similar interlamellar setae include A. pinnatus   and A. bituberculatus   . Austrocarabodes pseudoreticulatus   Covarrubias, 1967, A. maculatus Hammer, 1966   , A. hendriksi   and A. haradai   have sensilli resembling that of A. crassimarginatus   . Austrocarabodes mixtus   has similar notogastral setae and A. foliaceisetus foliaceisetus Krivolutsky, 1971   and A. foliaceisetus georgiensis Murvanidze & Weigmann, 2007   have phylliform anal setae which resemble the adanal setae.

Type material. The holotype (3716.1.1) and nine paratypes (3716.1.2) were sampled at St Lucia Mission Rocks (28 º04’S 32 º 32 ’E) in KwaZulu-Natal in open grassland, coastal dune forest and exotic Acacia   stands by J. P. Eksteen, 8.xi. 1993. The holotype and paratypes are deposited in the Acarology collection of the National Museum, Bloemfontein, South Africa.

Collection data. Known distribution of A. crassimarginatus   is indicated by filled circles on the map of South Africa, Fig. 4 View FIGURE 4 . Abbreviations for provinces: KZN = KwaZulu-Natal; EC = Eastern Cape.

Cape Vidal State Forest KZN (28 º07’S, 32 º 33 ’E, indigenous forest); near Highflats KZN (30 º 15 ’S, 30 º 14 ’E, humid soil and grasses); St Lucia Mission Rocks KZN (28 º04’S, 32 º 32 ’E, grassland, coastal dune forest, exotic Acacia   stands and Pine plantations); St Lucia Mission Rocks KZN (28 º 22 ’S, 32 º 23 ’E, edge of Pine plantation); Emoyeni KZN (28 º00’S, 32 º 14 ’E, inland coastal forest); Cintsa EC (32 º 48 ’S, 28 º05’E, decomposed plant debris).