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Volume 70, 1940-41
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Genus Parisotoma Bagnall, 1940.

Of Isotoma facies but with ocelli reduced to six or less to each side; postantennal organ present or absent; Ant. IV with sense rods or cones. Small species.

Represented in New Zealand by three species, two of which are Australian and the other European.

Key to the new zealand species of parisotoma.
1. Ocelli present. 2
Ocelli absent. 3
2. Ocelli six to each side; claw without any inner teeth, but with small pair of outer teeth; mucro tridentate. P. pritchardi (Womersley)
Ocelli four to each side; claw without any teeth; mucro tridentate. P. notabilis (Schaeffer)
3. Postantennal organ present, large and elliptical. Claw without any teeth; mucro tridentate with apical tooth the larger. P. linnaniemia (Womersley)

Parisotoma pritchardi (Womersley, 1936). Plate 53, figs. 235–237.

1936. Isotoma pritchardi Womersley.

Colour: Greenish-black.

Clothing: Clothed with short simple setae and, posteriorly on abdomen, longer erect coarsely ciliated setae.

Body: Length up to 1·8 mm. Antennae twice as long as head, four-segmented, the segments related as 7: 11: 11: 15. Ant. IV somewhat swollen apically. Ocelli six to each side, equal, and situated on dark fields. Postantennal organ oval, double outlined, and about one and a-half times as long as an ocellus. Abd. III and Abd. IV equal.

Legs: Claws without inner teeth but with two small outer teeth near middle of outer edge. Empodial appendage about one-third as long as claw with broad inner and outer lamellae. Tenent hairs absent.

Furcula: Slender and reaching to ventral tube. Mucro tridentate, apical and pre-apical teeth equal and a long lateral basal tooth. Dens apically with two long setae, one of which overreaches mucro.

Localities: Amongst shore debris Muriwai, Auckland, and Waiheke Island, Auckland (collected by E. D. Pritchard).

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Parisotoma linnaniemia (Womersley, 1934). Plate 53, figs. 238–240.

1934. Isotoma linnaniemia Womersley.

Colour: It is entirely white.

Clothing: Of numerous short, simple setae with occasional longer ones on Abd. V and Abd. VI.

Body: Length 1·0 mm. Antennae a little longer than head. Ant. I: II: III: IV as 3: 6: 6: 8. Ant. IV with small terminal knob. Ocelli absent. Postantennal organ large, elliptical, and double outlined, and with constriction near centre. Abd. III: Abd. IV as 5: 6: Abd. V and Abd. VI fused.

Legs: Claw without any teeth. Empodial appendage pointed with broad inner and narrow outer lamellae, inner lamella with a small tooth. Tenent hairs absent.

Furcula: Reaching only to Abd. II. Dens about twice as long as manubrium. Mucro elongate with three teeth, almost in line, of which the pre-apical is largest.

Locality: This is an Australian species reported by Womersley in 1936 as occurring at Davies Bush, Brookby, Manurewa, Auckland. So far, it has not been found elsewhere.

Parisotoma notabilis (Schaeffer, 1896). Plate 54, fig. 241.

1896. Isotoma notabilis Schaeffer.

Colour: Grey.

Clothing: Short plain setae and longer ciliated setae.

Body: Length 1·0 mm. Antennae half as long as head. Ocelli, four to each side. Postantennal organ oval and as long as an ocellus.

Legs: Claw without any teeth, empodial appendage half as long as claw and sharply pointed. No tenent hairs.

Furcula: Dentes about three times as long as manubrium. Mucro tridentate.

Locality: This European species was reported from Davies Bush, Manurewa, Auckland, by Womersley in 1936. It has not been found elsewhere.