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#cepaea

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Colin Purrington

This summer I'm going to try luring the eastern shell-nesting mason bee (Osmia conjuncta) into my yard. The species occurs in Pennsylvania but is extremely rare, probably because its preferred shell, Anguispira kochi, is presumed to be locally extinct. But Ontario populations of the bee are thriving and seem completely happy to use shells of Cepaea (an invasive from Europe) so I thought I'd give them a try here. Yes, I know this is futile. #bees #osmia #insects #snails #shells #cepaea #pollinators #entomology #ontario #canada

Rectangular cement planter on which several dozen yellow shells are scattered on the surface, some partially covered by dried leaves.
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Colin Purrington

Beautiful print of Osmia conjuncta by @minouette. #bees #insects #snails #cepaea #shells #art #linocut spore.social/@minouette/109755

8”x8” Lino block print of a small blue and black bee Osmia conjuncta landing on an upturned empty Cepaea snail shell in gold with brown on cream coloured washi paper
Spore by Project MushroomEle Willoughby, PhD (@minouette@spore.social)Attached: 1 image Here’s my #printerSolstice @printerSolstice #linocut for the prompt “texture”. The Eastern Snail Shell Mason Bee (Osmia conjuncta) is a small North American blue bee which makes nests in suitable empty snail shells! In my linocut I show this adorable little pollinator with a Cepaea shell. Each print is 8” by 8” on delicate Japanese kozo (or mulberry) paper. #printmaking #masonBee #snailShell #OsmiaConjuncta #Cepaea #sciart #EasternSnailShellMasonBee #nativeBees #pollinator #washi
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Angus Davison

New 🐌 paper alert! We showed that snails with v. few mtDNA copies per nuclear genome (<10) have a v. high rate of heteroplasmy; heteroplasmy is inherited through the germline, albeit with selection against synonymous mutations. We also found that some mtDNA genomes have tRNAs that are repeated up to 24 times! doi.org/10.1186/s12864-024-105

#PaperThemeTune "12XU" by Wire youtu.be/jOjCSLMZPok (mainly because I just rediscovered it 😄) #snails #mtDNA #genomics #heteroplasmy #cepaea #wgs #12XU #wire

BioMed CentralHigh heteroplasmy is associated with low mitochondrial copy number and selection against non-synonymous mutations in the snail Cepaea nemoralis - BMC GenomicsMolluscan mitochondrial genomes are unusual because they show wide variation in size, radical genome rearrangements and frequently show high variation (> 10%) within species. As progress in understanding this variation has been limited, we used whole genome sequencing of a six-generation matriline of the terrestrial snail Cepaea nemoralis, as well as whole genome sequences from wild-collected C. nemoralis, the sister species C. hortensis, and multiple other snail species to explore the origins of mitochondrial DNA (mtDNA) variation. The main finding is that a high rate of SNP heteroplasmy in somatic tissue was negatively correlated with mtDNA copy number in both Cepaea species. In individuals with under ten mtDNA copies per nuclear genome, more than 10% of all positions were heteroplasmic, with evidence for transmission of this heteroplasmy through the germline. Further analyses showed evidence for purifying selection acting on non-synonymous mutations, even at low frequency of the rare allele, especially in cytochrome oxidase subunit 1 and cytochrome b. The mtDNA of some individuals of Cepaea nemoralis contained a length heteroplasmy, including up to 12 direct repeat copies of tRNA-Val, with 24 copies in another snail, Candidula rugosiuscula, and repeats of tRNA-Thr in C. hortensis. These repeats likely arise due to error prone replication but are not correlated with mitochondrial copy number in C. nemoralis. Overall, the findings provide key insights into mechanisms of replication, mutation and evolution in molluscan mtDNA, and so will inform wider studies on the biology and evolution of mtDNA across animal phyla.
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