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Potential contribution of surface-dwelling Sargassum algae to deep-sea ecosystems in the southern North Atlantic
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Sacoglossa or Acochlidia? 3D reconstruction, molecular phylogeny and evolution of Aitengidae (Gastropoda: Heterobranchia)
TLDR
The acochlidian nature of Aiteng is strongly indicated by the molecular analysis, in which it forms a basal hedylopsacean offshoot or the sister clade to limnic Acochlidiidae and brackish or marine Pseudunelidae within Hedylopsacea.
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Computer‐based three‐dimensional reconstruction of the anatomy of Microhedyle remanei (Marcus, 1953), an interstitial acochlidian gastropod from Bermuda
TLDR
A comparative microanatomical discussion and the distribution of characters within acochlidian taxa indicate that the current classification of the Acochlidia does not reflect phylogenetic relationships.
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Sex in the beach: spermatophores, dermal insemination and 3D sperm ultrastructure of the aphallic mesopsammic Pontohedyle milaschewitchii (Acochlidia, Opisthobranchia, Gastropoda)
TLDR
It is concluded that sperm penetrate epithelia, tissues and cells mechanically by drilling rather than lysis, which could have enabled the species diversification of microhedylacean acochlidians.
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Cryptic Species in Tropic Sands - Interactive 3D Anatomy, Molecular Phylogeny and Evolution of Meiofaunal Pseudunelidae (Gastropoda, Acochlidia)
TLDR
This is the first case study on meiofaunal gastropods to test diversity estimations from traditional taxonomy against results from modern microanatomical methodology and molecular systematics, and reveals actual species diversity within Pseudunela reliably.
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Towards a phylogeny and evolution of Acochlidia (Mollusca: Gastropoda: Opisthobranchia)
TLDR
It is concluded that the acochlidian ancestor was marine mesopsammic, and the formerly enigmatic Ganitidae, resembling sacoglossan opisthobranchs by having dagger-like rachidian radular teeth, are likely to be highly derived microhedylids.
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Tiny but complex - interactive 3D visualization of the interstitial acochlidian gastropod Pseudunela cornuta (Challis, 1970)
TLDR
In spite of its small body size, the interstitial hermaphroditic P. cornuta shows high complexity regarding all major organ systems; the excretory system is as differentiated as in species of the sister clade, the limnic and much larger Acochlidiidae, and the reproductive system is by far the most elaborated one ever observed in a mesopsammic gastropod, though functionally not yet fully understood.
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Undersized and underestimated: 3D visualization of the Mediterranean interstitial acochlidian gastropod Pontohedyle milaschewitchii (Kowalevsky, 1901)
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Tantulum elegans reloaded: a computer-based 3D-visualization of the anatomy of a Caribbean freshwater acochlidian gastropod
TLDR
To their surprise, adults of T. elegans are sequential hermaphrodites with an unusual androdiaulic reproductive system and a well-developed cephalic penial complex.
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3D-microanatomy of the mesopsammic Pseudovermis salamandrops Marcus, 1953 from Brazil (Nudibranchia, Gastropoda)
TLDR
It is shown that microanatomical redescriptions of poorly known Pseudovermidae are needed to gather comparative data as a backbone to place these neglected meiofaunal slugs in a phylogeny and trace their evolutionary pathway into the mesopsammon.
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