. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Collembola from the Magallanes Province 103. Figs 3—7: Triacanthella vogeli sp. n. Fig. 3 — antennal segment III and IV, dorsal side. Fig. 4 — antennal segment III and IV, ventral side. Fig. 6 — leg III and dorsal side of claw. Fig. 7 — abdominal segment VI, dorsal side. Ventral tube with 9 + 9 setae. Tenaculum with 3 + 3 teeth. Dens without apical lobe, adult specimens with 15 — 17 setae, preadult specimens with 13 — 16 setae, juvenile specimens with 10—11 setae; a
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. Collembola from the Magallanes Province 103. Figs 3—7: Triacanthella vogeli sp. n. Fig. 3 — antennal segment III and IV, dorsal side. Fig. 4 — antennal segment III and IV, ventral side. Fig. 6 — leg III and dorsal side of claw. Fig. 7 — abdominal segment VI, dorsal side. Ventral tube with 9 + 9 setae. Tenaculum with 3 + 3 teeth. Dens without apical lobe, adult specimens with 15 — 17 setae, preadult specimens with 13 — 16 setae, juvenile specimens with 10—11 setae; all specimens have one long, smooth seta at the base, all other setae are ciliated (Fig. 5). Muero as in Fig. 5. Dorsal chaetotaxy with mesochaetae of two types: smooth and ciliated, with very long ciliated macrochaetae and sensory setae as in Fig. 2. Macrochaetal chaetotaxy per half tergite and subcoxa or pleurite: 8 / 2 + 1, 3 + 1, 3 + 1, / 2 + 1, 2 + 1, 2 + 1, 3 + 0, 3 + 0, 3. Abdomen VI with three anal spines of which posterior one is very short (Fig. 7). Discussion: Triacanthella vogeli sp. n. is very similar to two species from Argentina: T. andina Cassagnau & Rapoport, 1962 from Neuquén (Lago Frias and Nahuel Huapi) and T. najtae Izarra, 1971 from Tierra del Fuego and Isla de Los Estados. These three species share the following characters: presence of rosette-shaped tubercles on abdomen VI, shape of claw and rudimentary empodial appendage, reduction of two ocelli (G and H). The new species differs from the two others by the absence of apical lobe on the dens and very short posterior anal spine. Further differences concern the type of macrochaetae (in T. andina they are only ciliated in the distal half; in T. najtae they are only crenelated and short, in T. vogeli sp. n. they are ciliated at the whole length) and formula of macrochaetal chaetotaxy (in T. andina per half tergite and subcoxa or pleurite = 7 / 2,3,3, / 4,4,4,4,3,4 — after Cassagnau &am
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