Genotype: Spinocerura capillata sp. nov.
This new genus, which is allied to Proisotomurus Wom., on the one hand, and Tomocerura Wahl., on the other, is characterized by the complete absence of abdominal bothriotrichia and the presence of two types of papillate dental spines. There are two rows of slender simple spines, one running the full length of the dens, the other generally finishing before the mucro is reached. In addition, there are from one to three rows of short, stout, dark coloured spines running from the base of the dens to about two-thirds down. In both types each spine arises from small raised papilla. Abdomen IV is slightly shorter than Abd. III. The setae are of a peculiarly coarsely-ciliated type in which the cilia are more like small spines. The slender spines are of the Proisotomurus type, the stout spines of the Tomocerura type. So far, the genus contains only one species.
Spinocerura capillata sp. nov. Plate 52, figs. 212–216.
Colour: Dark brown with dark blue markings, as follows: Narrow broken cross bands around posterior margins of all segments, a broad broken line along ventral edges of pleura and scattered, irregular-shaped marks all over body. A dark band around bases of and between antennae. Irregular-shaped dark patches on top and sides of head. Legs brownish with tibia darker brown and tarsi very dark brown. Antennae medium brown on I, darker on II and III and Ant. IV a deep blue-black. Dark blue rings around distal ends of Ant. II and III. Furcula pale-brown.
Clothing: Short simple setae and long stout ciliated setae. These latter setae not like the usual ciliated setae met with in Collembola, but very coarsely ciliated, the cilia being more like small spines. They are irregularly placed on most setae, and of varying size and may be on one side of a seta only. Ant. I and II are thickly clothed with moderately long setae, but Ant. III and IV with only short setae. Legs clothed with short and occasional very long setae ciliated as above.
Body: Length up to 4·4 mm. Antennae two and three-quarters as long as head. Head half as long as thorax. Antennae four segmented, the segments related as 11 : 14: 14 : 18. Ocelli on black pigment patches, eight to each side and all large. Postantennal organ very small and widely elliptical. Ventral tube short and slightly swollen distally. Abd. III longer than IV as 19: 13.
Legs: Claw with single inner tooth at a little less than half-way from base, two external outer lateral teeth at about one-third from claw base. On sides, claw is lightly striated near centre. Empodial appendage sharply pointed, lanceolate, with central rib and inner and outer lamellae, inner lamella with prominent tooth just above centre and rib with blunt tooth near base. Empodial appendage about half as long as claw. Tenent hairs absent.
Furcula: Bearing many coarsely-ciliated setae. Dens with one row of slender spines running entire length, one row running two-thirds of its length, and two rows of shorter, stouter, spines running about one-half its length, each spine on a raised papilla. Mucro
with very large apical and sub-apical teeth, a smaller external dorsal sub-apical tooth, a small proximal lateral tooth on outer side with a lateral rib. Manubrium to mucrodens as 17:36.
Localities: Akatarawa Divide, 1,400 ft., amongst lichen growing on a rocky face; Aniwaniwa Arm, Lake Waikaremoana, amongst leaf debris.
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Type: Slide 3/555, Dominion Museum Collection.