Journal of Conchology 44/4

r iccardoella liMacuM and r. oudeMansi at s t n iCholas f ields 353

Table 1 Details of Riccardoella oudemansi records from St Nicholas Fields, York. All records were made by Jane Thomas.

Grid ref.

Date

Host

SE614519 SE617515 SE616515 SE616517 SE615516 SE616518 SE616519 SE615516 SE616518 SE616516 SE616516 SE616519 SE615519 SE614519

17/11/2021 20/10/2021 20/10/2021 03/11/2021 13/10/2021 17/11/2021 30/12/2020 30/12/2020 17/11/2021 30/12/2020 04/05/2022 30/12/2020 13/10/2021 17/11/2021

Smooth glass snail Aegopinella nitidula (Draparnaud, 1805) White-lipped snail Cepaea hortensis (O. F. Müller, 1774) Garden snail Cornu aspersum (O. F. Müller, 1774) Cellar snail Oxychilus cellarius (O. F. Müller, 1774) Draparnaud’s glass snail O. draparnaudi (H. Beck, 1837) Glossy glass snail O. navarricus (Bouguignat, 1870) Hairy snail Trochulus hispidus (Linnaeus, 1758) Iberian threeband slug Ambigolimax valentianus (Férussac, 1822)

Brown soil slug Arion distinctus J. Mabille, 1868 Tawny soil slug A. owenii Davies, 1979 Vulgar slug A. vulgaris Moquin-Tandon, 1855

Green cellar slug Limacus maculatus (Kaleniczenko, 1851) Budapest keeled slug Tandonia budapestensis (Hazay, 1880) Winter semi-slug Vitrina pellucida (O. F. Müller, 1774)

Goethem (1986). We remain on the lookout for more R. limacum at St Nicks, as well as other Riccardoella species both described (e.g. R. reau muri and R. canadensis – see Fain & Van Goethem, 1986) and undescribed, which might be found in Britain. It is hoped that others are encouraged to look more closely at these highly under-recorded mites. a cknowledgeMents We wish to thank Matthew Shepherd for verify ing St Nicks records of R. limacum and R. oude mansi . We are also grateful to two anonymous peer-reviewers for their constructive feedback. r eferences B UCKTON S 2022 Reserve Focus: St Nicholas Fields LNR British Wildlife 33 431–436.

F AIN A & V AN G OETHEM JL 1986 Les acariens du genre Riccardoella Berlese, 1923 parasites du poumon de mollusques gastéropodes pulmonés terrestres Acarologia 27 125–140. G RAHAM FJ, F ORD JB & R UNHAM NW 1993 Comparison of two species of mites of the same genus, Riccardoella associated with molluscs Acarologia 34 143–148. G RAHAM FJ 1994 ‘Biology and Control of Riccardoella limacum (Schrank), a Mite Pest of Farmed Snails’ PhD thesis, University of Wales, Bangor. R APER C 2021 United Kingdom Species Inventory (UKSI) Version 37.9 Natural History Museum. Checklist dataset https://doi.org/10.15468/ rm6pm4 accessed via GBIF.org on 22 November 2021. U ECKERMANN EA & T IEDT LR 2003 First record of Riccardoella limacum (Schrank, 1776) and Riccardoella oudemansi Thor, 1932 (Acari: Ereynetidae) from South Africa African Plant Protection 9 23–26.