(027/HYvia) Hypogastrura viatica (Tullberg, 1872)
*pseudoviatica (Bagnall, 1941)
*subviatica (Bagnall, 1941)
This is a very common species occurring in sites rich in organic matter including sewage sludge, rotting leaf litter, compost and other similar situations. The tibiotarsus of the first leg has two clavate tenant setae, the second leg has three and the third leg has three (Fig. 1). All these clavate setae are the same distance from the claw i.e. all in the A row. The presence of both normal (mesosetae) and macrosetae on the body is very obvious (Fig. 2).
Figure 1: Third leg of Hypogastrura viatica collected from Andover in October 1950 by J.T. Salmon. The empodium (emp) has a distinctive lamella. There are three clavate tenant setae on the tibiotarsus, all in the A row (one out of the plane of focus).
Figure 2: Dorsal side of second (abd2) and third (abd3) abdominal segments of Hypogastrura viatica collected from a compost heap in Guildford in February 1946 by R.S. Bagnall. The macrosetae and mesosetae are distinct.
Figure 3: Lateral view of the mucro and dens of the specimen of Hypogastrura viatica shown in Fig. 2.
Figure 4: Ventral view of the furca of Hypogastrura viatica collected from Byegrove Sewage Works in London in September 1955 by Peter Lawrence.