Members of the genus Neotullbergia have very distinctive anal spines that bear prominent lateral projections. The structure of these spines is at present, the only way to separate UK/Eire species. In Neotullbergia crassicuspis, the two anal spines are quite broad with a prominent outer spine on each; the inner side of each anal spine has a very weak projection (Fig. 1). The foot does not possess an empodium (Fig. 2) and the post-antennal organ is long and thin with about 30 simple double vesicles (Fig. 3).
Neotullbergia crassicuspis was described by Gisin (1944). There are several well-mounted specimens in the NHML collected by J.G. Sheals from Glasgow (date not given), and a literature record by Hutson (1980) from N.E. Yorks. The biggest of these specimens was 1.25 mm in length.