*distinguenda Bagnall, 1939
Isotomiella minor (Fig. 1) is a very common and widespread species of up to 1.3 mm in length that is commonly found in samples of soil and leaf litter. It is white in colour, does NOT possess a PAO and is eyeless. The furca is longer than the head (Fig. 1) and the mucro has three teeth (Fig. 2). The dorsal side of abd5/6 has several long 'ciliated' setae and the fourth antennal segment (ant4) bears a group of rounded sensory setae (Fig. 3). The setae on the ventral (anterior) side of the manubrium are characteristic with a 5+5 arrangement (Fig. 4).
There is a single Irish record of Isotomiella paraminor, unconfirmed.