Pristina armata, Schenková, Jana & Čermák, Václav, 2013

Schenková, Jana & Čermák, Václav, 2013, Description of Pristina armata n. sp. (Clitellata: Naididae: Pristininae) from a carnivorous plant (Nepenthes sp.) in Borneo, Indonesia, Zootaxa 3686 (5), pp. 587-592 : 588-589

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Pristina armata

n. sp.

Pristina armata n. sp.

( Figures 1 View FIGURE 1 B–D, 2 A–E)

Holotype. National Museum in Prague, Cat. No. P 6 E- 3128, whole mounted sexually immature specimen ( Fig. 1 View FIGURE 1 B,D, 2).

Type locality. Mentarang Hulu, district of Malinau Regency, East Kalimantan, Indonesia (1,230 m a.s.l.); the fluid of the Nepenthes sp. pitcher, which hosted six live clitellate specimens (holotype and paratypes); pH 6.6., 23 Feb 2012, leg. V. Čermák and M. Dančák.

Paratypes. Five specimens from the same Nepenthes sp. pitcher as the holotype, mounted whole into the same microscopic slide as the holotype (Cat. No. P 6 E- 3128, Fig. 2 View FIGURE 2 ), sexually immature; the larger specimens ( Fig. 1 View FIGURE 1 B: specimens B, D) with giant chaetae, the smaller ones ( Fig. 1 View FIGURE 1 B: specimens A, C, E) without.

Etymology. The specific name “ armata ” in Latin means armored, and refers to giant hook-like dorsal chaetae, which probably serve as a protection against predators.

Description. Very small worms, all sexually immature. Specimens with giant dorsal chaetae 647–967 μm long (holotype: 847 μm), 88–98 μm wide at VI and 61–116 μm at XII ( Fig. 2 View FIGURE 2 ). Specimens without giant chaetae 458– 667 μm long and 56–83 μm wide at VI and 86–91 μm at XII. Number of segments of specimens with giant chaetae 13–20 (holotype: 15), number of segments of specimens without giant chaetae 12–17. Body wall without a noticeable pigmentation. Prostomium without proboscis, rounded and conical, short in three specimens, e.g. 21 μm long and 42 μm wide, almost as long as wide near the base in the other three specimens, e.g. 52 μm long and 51 μm wide ( Fig. 1 View FIGURE 1 C). Prostomium clearly separated from the head part. No eyes. Coelomocytes present, not numerous, 10 μm in diameter. Chloragogen cells from VI, no intestinal dilatation.

Dorsal chaetae begin at II with one hair chaeta and one needle chaeta per bundle. Hair chaetae without serration (as far as it was possible to distinguish in mounted specimens), 43–124 μm long, longest at IV. Needle chaetae tiny, length 22–25 μm, diameter 1 μm, simple-pointed and slightly curved ( Fig. 2 View FIGURE 2 C,D) except at IV. Giant hook-like dorsal chaetae at IV ( Figs 1 View FIGURE 1 D, 2 A,B), 1 per bundle, length 40–48 μm, diameter 3 μm, almost twice as long and 3 x as thick as the regular needle chaetae. Giant chaetae with straight and slightly longer proximal part (holotype: 31 μm) and shorter hook-like distal part (holotype: 24 μm). Giant chaetae absent in the smallest specimens, here needles at IV minutely longer, e.g. 29 μm at IV vs. 27 μm at VI, slightly thicker and more curved in distal part (measurement of specimen A, Fig. 1 View FIGURE 1 B). Ventral chaetae 19–31 μm long, bifid with teeth of equal length ( Fig. 2 View FIGURE 2 E), nodules not visible at 400 x magnification, all of the same shape, 2–4 (exceptionally 5) per bundle with decreasing number from head to tail region.