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Caseolus sphaerulus
''Caseolus sphaerulus'' is a species of small land snail, a terrestrial pulmonate gastropod mollusk.
The specific epithet is spelled ''C. sphaerulus'' in both of the references here cited, however the species is also often referred to in reputable sources as ''C. sphaerula'', for example in the Convention of Berne and the Habitats Directive. Here we are assuming these usages are in error, firstly because the Latin word "caseolus" is masculine, and also for reasons of consistency, because R.T. Lowe named at least five other species in the genus ''Caseolus'' using masculine adjectival names.
==Distribution and conservation status==
This species of land snail lives in Madeira on dry, stony ground.〔(P. Koomen, P.J. Van Helsdingen, Listing of biotopes in Europe according to their significance for invertebrates (Nature and Environment No. 77) (1998) ISBN 978-92-871-3002-0 )〕
It is mentioned in annexes II and IV of the Habitats Directive. This species is threatened by forest replanting, mixed forms of pollution, erosion and the impact of improved access to its habitat. Its future prospects are bad and the species is likely to become extinct in its biogeographical region.〔(Report on the main results of the surveillance under article 11 for annex II, IV and V species (Annex B) Factsheet : Caseolus sphaerula )〕
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