Anuridella immsiana (maximum length 1.0 mm) is an intertidal species which has only been recorded by Bagnall. He described it in 1939 from material collected in July 1938 from Cloughey, Co. Down, Ireland. Lawrence & Goto (1968) considered that Anuridella immsiana was a junior synonym of Anuridella calcarata Denis 1925. However having examined Bagnall's material in the NHML, Steven agreed with the conclusion of Fjellberg (1998) that Anuridella immsiana is a good species. The post-antennal organ (PAO) is circular with typically ten (but occasionally up to 12) vesicles (Fig. 1). Also, the pair of setae a1 on the dorsal side of abd6 are PRESENT (Fjellberg 1998); this character is easy to observe on most specimens (Fig. 2). Coxal lobes are present on both legs2 and legs3 but they are quite difficult to resolve on mounted specimens. Anuridella immsiana and Anuridella submarina (and Anuridella calcarata) have hammer-shaped sensillae on ant4 (all sensilla are finger-like in Anuridella marina).