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The long way to diversity--phylogeny and evolution of the Heterobranchia (Mollusca: Gastropoda).

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From sea to land and beyond – New insights into the evolution of euthyneuran Gastropoda (Mollusca)

It can be proposed for the first time that invasion of freshwater by Pulmonata is a unique evolutionary event and has taken place directly from the marine environment via an aquatic pathway.
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Reconstruction of the phylogeny of the opisthobranchia (Mollusca:Gastropoda) by means of 18S and 28S rRNA gene sequences

The opisthobranch subgroups, including the Acochlidiacea, were confirmed as monophyletic in most analyses, whereas monophyly vs paraphyly of Opisth Hobranchia could not be resolved.
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Systematic position of the pelagic Thecosomata and Gymnosomata within Opisthobranchia (Mollusca, Gastropoda) – revival of the Pteropoda

Maximum parsimony, maximum likelihood, distance as well as Bayesian analysis of a combined dataset of the three genes reveals that Thecosomata and Gymnosomata are sister groups and together are closely related to Anaspidea.
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Opisthobranchia (Mollusca, Gastropoda) – more than just slimy slugs. Shell reduction and its implications on defence and foraging

According to phylogenetic analyses, the reduction of the shell correlates with the evolution of defensive strategies and had an implication on exploration of new food sources and therefore likely enhanced adaptive radiation of several groups.
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Transcriptomic Evidence That Longevity of Acquired Plastids in the Photosynthetic Slugs Elysia timida and Plakobranchus ocellatus Does Not Entail Lateral Transfer of Algal Nuclear Genes

This work sequenced expressed mRNAs from actively photosynthesizing, starved individuals of two photosynthetic sea slug species, Plakobranchus ocellatus Van Hasselt, 1824 and Elysia timida Risso, 1818, and finds that nuclear-encoded, algal-derived genes specific to Photosynthetic function are expressed neither in P. o cellatus nor in E. timida.
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Bye bye "Opisthobranchia"! A review on the contribution of mesopsammic sea slugs to euthyneuran systematics

The present study combines the published and unpublished topologies, and indicates that monophyletic Rhodopemorpha cluster outside of Euthyneura among shelled basal heterobranchs, acteonids are the sister to rissoellids, and Nudipleura are the basal offshoot of EUTHyneura.

Flashback and foreshadowing—a review of the taxon Opisthobranchia

A phylogenetic hypothesis on Heterobranchia that, according to the latest results, represents a consensus and is the most probable one available to date and has profound implications for preconceived textbook scenarios of opisthobranch and pulmonate evolution, which must now be reconsidered.
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New insights into the phylogeny of the Pyramidellidae (Gastropoda)

Tree reconstruction revealed Pyramidellidae deeply nested within Pulmonata implying a pulmonate origin of these ectoparasitic marine snails, but the sister group of Pyramidllidae could not unambiguously be inferred due to lacking statistical support.
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Comparative investigation of the genital systems in the Opisthobranchia (Mollusca, Gastropoda) with special emphasis on the nidamental glandular system

It can be concluded that the albumen gland has undergone a structural and functional change within the evolution of the Opisthobranchia.
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