New Desmodoridae (Nematoda: Desmodoroidea) : three new species from Ceriops mangrove sediments (Kenya) and one related new species from the North Sea

Three new species of nematodes (Chromaspirina okemwai sp.n., Pseudochromadora interdigitatum sp, n. and Eubostrichus africanus sp. n.) from Ceriops mangrove sediments and one new species (Eubostrichus longosetosus sp. n.) from the North Sea, along the Belgian coast, are described. Chromaspirina okemwai is characterized by four cephalic sensillae and unispiral amphids; Pseudochromadora interdigitatum has unique lateral alae where body annules split into two, three or four smaller ones. Eubostrichus africanus has short (6 mu m) cephalic and subcervical setae and five pairs of strong broad based setae at the tail region; Eubostrichus longosetosus has long (14 mu m) cephalic and subcervical setae, three pairs of strong setae on the tail and two fine ones at the tail tip. Eubostrichus parasitiferus as described by Hopper and Cefalu (1973) is given a new name, E. hopperi sp. n. A revision of the genus Chromaspirina and Pseudochromadora is also included