Members of the Lekanesphaera genus are pill isopods, the identification of which is somewhat more complicated than indicated in Naylor & Brandt (2015) and Hayward & Ryland (2017), not least because Naylor & Brandt do not include Lekanesphaera levii, whilst Hayward & Ryland leave out Lekanesphaera monodi. Although the patterning of tubercles on the pleotelson can be indicative of species, determination should be based on the presence and patterning of setae on the first pereopod of mature specimens (Jacobs 1987).
L. monodi is characterised by a smooth pleotelson, whilst the first pereopod has up to 70 smooth setae on the ischium, about 100 on the merus, and between 3 and 8 distodorsal setae on the propodus. Males are up to 12.0mm, females up to 8.0mm.
Distribution and Habitat
Occurs between MTL and LWN in rock crevices and under stones in estuaries or on shores with freshwater run off. The species is found on south-eastern, southern and western British and east Irish coasts.
Jacobs, B. J. M. 1987. A taxonomic review of the European, Mediterranean and NW. African species generally placed in Sphaeroma Bosc, 1802 (Isopoda: Flabellifera: Sphaeromatidae). Zoologische Verhandelingen 238, 3-71.
Naylor, E. & A. Brandt. 2015. Intertidal Marine Isopods. Synopses of the British Fauna (New Series), No. 3. Field Studies Council, for The Linnean Society of London.