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Zoology Publications from Victoria University of Wellington—Nos. 49 to 51

Spinanurida mandibulata n.g. et n.sp

Spinanurida mandibulata n.g. et n.sp.

Figs. 1-9.

Colour: Creamy-white sparsely overlaid with scattered dark blue pigment granules.

Clothing: Sparsely clothed with short simple curved setae, with longer, tapering, finely serrated setae posteriorly, the latter often with a small apical swelling. Long slender simple setae on the antennae and occasionally on the head and legs.

Body: Length up to 0.66 mm. Antennae four segmented, but with segments III and IV almost completely fused, the segments related as 25:20:42, the basal segment very broad, being 25 long: 49 wide. Sense organ of Ant. III situated on the distal margin and consisting of two stout, bent, fully exposed sense clubs arising from separate but closely approximating pits, and with one short detached guard seta. Also near the centre of Ant. III, a very long and very stout curved sense rod. Ant. IV with sub-apical retractile knob in sensory pit; two very stout, almost straight apical sense rods and at least three similar subapical sense rods; a very stout long curved apical sense rod and at least three similar but smaller subapical sense rods. All page 41
Figs. 1-9, Spinanurida mandibulata n.g. et sp. Fig. 1, Hind foot. Fig. 2, Hind foot inner margin showing tenent hairs. Fig. 3, Ants. II, III, IV. Fig. 4, Maxilla head. Fig. 5, Head of mandible. Fig. 6, Genital aperture. Fig. 7, Sense organ Ant. III. Fig. 8, Abd. VI showing anal spines and setae. Fig. 9, Ocelli Figs 1 6 and 7 Scale A; Figs. 2, 8 and 9, Scale B; Figs. 3, 4 and 5, Scale C.

Figs. 1-9, Spinanurida mandibulata n.g. et sp. Fig. 1, Hind foot. Fig. 2, Hind foot inner margin showing tenent hairs. Fig. 3, Ants. II, III, IV. Fig. 4, Maxilla head. Fig. 5, Head of mandible. Fig. 6, Genital aperture. Fig. 7, Sense organ Ant. III. Fig. 8, Abd. VI showing anal spines and setae. Fig. 9, Ocelli Figs 1 6 and 7 Scale A; Figs. 2, 8 and 9, Scale B; Figs. 3, 4 and 5, Scale C.

page 42 antennal segments, but particularly Ant. IV, heavily clothed with long setae. Maxilla head noticeably larger and stouter than mandibular head, provided with two hooklike teeth as shown in Fig. 4. Mandibular head quite unusual, hatchet shaped with seven teeth the basal three of which form an extremely large and conspicuous group projecting abruptly from the mandibular face as shown in Fig. 5. The projection is formed from a broad plate bearing two large apical teeth in line and a third large, curved, lateral tooth arising about the centre of the projecting plate. Ocelli eight to each side, subequal, in ocellar fields bounded by a raised mound of cuticular granules (Fig. 9); the fields themselves, finely granulated and pigmented. Cuticle of body finely granulate and finely and evenly tuberculate. Abd. VI with six anal spines arranged transversely in a posterior row of two and an anterior row of four; these are interspersed with long, slender, finely, but sparsely serrated setae, with faintly swollen tips, and much shorter, simple, slender, curved setae. The spines themselves produced apically into a filamentous extension, with a small apical knob. These details and arrangements are shown in Fig. 8. Abd. VI has no dorsal setae. The genital aperture is situated on a slight mound bounded posteriorly by a ridge, flanked on each side by two short setae and surrounded anteriorly by eight somewhat longer simple setae. The genital mound finely granulate but not tuberculate.

Foot: Claw relatively very small, finely granulate, particularly on the inner margin and without any teeth. Unguiculus absent or represented by a tiny granulated swelling. Claw without basal seta, but a very stout almost spine-like seta arises on the tibiotarsus, just above the base of the claw. Two long clavate tenent hairs on the outer edge of each tibiotarsus and three shorter clavate tenent hairs on the inner edge, two being in line further from the claw base than the single one (Fig. 1).

Furcula and tenaculum absent.

Paratype in author's collection.

Locality: Lachen, Sikkim, 9000′ altitude in moss, leaf litter of a pine wood. Lachung, Sikkim, 8610′ altitude in moss and undergrowth of a pine wood.