Genus Isotomiella Bagnall, 1940.
Of Isotoma facies but without ocelli or postantennal organ. Ant. IV with sense rods or cones. Ventral surface of manubrium with but few sub-distal setae.
Represented in New Zealand by but one exotic species.
Isotomiella minor (Schaeffer, 1896). Plate 54, figs. 242–244.
1896. Isotoma minor Schaeffer.
Clothing: Of long, stiff and slightly curved plain setae and longer ciliated setae.
Body: Length 0·9 mm. Antennae about one-quarter longer again than head, the segments related as 3: 7: 7: 10. Ant. IV with 6–7 sensory cones and several sensory rods. Ocelli and postantennal organ absent.
Legs: Claw without any teeth. Empodial appendage sharply pointed and from one-half to two-thirds as long as claw. Tenent hairs absent.
Furcula: Not quite reaching to ventral tube. Dens 2–3 times as long as manubrium; slightly corrugated on proximal half only. Mucro tridentate, all teeth reaching same height.
Locality: Reported in New Zealand from Pukekaroro Creek, Hillsborough, Auckland, in humus, by Womersley in 1936. So far, not recorded elsewhere.