Ceratophysella gibbosa belongs to the 'denticulata group' with setae p1<p2 on abd4 (Fig. 1). Cleared specimens are easy to identify as they have only 2+2 axial setae on abd4 (m1 absent; Fig. 1) and a protruding field of granules on the dorsal side of abd5 (Figs. 2, 3). Ceratophysella gibbosa has been found in sites rich in organic matter, sometimes in 'swarms'. There are no confirmed records for Ireland, Wales, or England west of a line between Liverpool and Southampton. A few specimens labelled 'Ceratophysella gibbosa' in the NHML collection are Ceratophysella denticulata (and vice versa!).
Apparently this same species has been found as the same genotype in several places on Tenerife as in mainland Europe (Brent Emerson in prep), suggesting it to be an invasive 'tramp' species.