Genus Polyacanthella Schaeffer, 1897.
Generally small species with from four to seven anal spines arising directly from segment without papillae. Furcula present but sometimes reduced or absent.
Represented in New Zealand by two small species, one of which, P. parva, was described by Womersley in 1936, and I am indebted to Mr. Womersley for the loan of his material for examination.
|1.||Body of normal form. Claw without any teeth.||P. parva Womersley|
|2.||Body of peculiar form, Abd. VI being reduced and almost enclosed by Abd. V. Claw with one inner tooth.||P. proprieta sp. nov.|
Polyacanthella parva Womersley, 1936. Plate 42, figs 58–60.
Colour: Deep blue-black.
Clothing: Thinly-clothed with fine short setae. Cuticle finely tuberculate.
Body: Length 0·6 mm. Antennae two-thirds as long as the head. Ant. III with sensory organ protected by two double-bent setae. Ocelli eight on each side. Postantennal organ absent. Abd. VI somewhat elongated and with six short straight anal spines without papillae.
Legs: Claw without any teeth. Empodial appendage and tenent hairs absent.
Locality: Known at present only from Pukekaroro Creek, Hills-borough, Auckland, from whence it was collected by Mr. E. D. Pritchard.
Polyacanthella proprieta sp. nov. Plate 42, figs. 53–57.
Colour: Medium bluish-grey all over.
Clothing: Sparsely clothed with short, plain setae. Cuticle finely tuberculate.
Body: Length 1 mm. Antennae two-thirds as long as head, third and fourth segments indistinctly separated. Body with paratergal swellings and of peculiar form. Seen from above abdomen very bunched up and not much longer than thorax. Head: thorax: abdomen as 15: 19: 28. Abd. VI very small and more or less enclosed, except for its posterior margin, in Abd. V. Four minute anal spines no larger than the cuticular granules, arranged on Abds. IV and V, one pair on each side of Abd. VI as in Fig. 54. Ocelli eight to each side, equal, and on raised black pigment patches, situated in a fold of the head cuticle. Postantennal organ equal to an ocellus and with seven peripheral lobes.
Legs: Claw with wide base and one prominent inner tooth at about centre. No outer teeth. Empodial appendage and tenent hairs absent. Claw with external basal tunica with serrated lateral edges.
Locality: In forest south of Bullock Creek, and between it and the Karangarua River, South Westland, in leaf debris on the forest floor.
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Type: Slide 3/946, Dominion Museum Collection.
Known at present from the type specimen only.