Microanatomy of shelled<i>Koloonella</i>cf.<i>minutissima</i>(Laseron, 1951) (Gastropoda: ‘lower’ Heterobranchia: Murchisonellidae) does not contradict a sister-group relationship with enigmatic Rhodopemorpha slugs

Brenzinger, Bastian; Wilson, Nerida G.; Schrödl, Michael

doi:10.1093/mollus/eyu036

Cited by 14 publications

(14 citation statements)

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“…The name Heterobranchia was coined by Burmeister (1837), but it is most commonly attributed to Gray (1840) who used it to unite the Opisthobranchia (e.g., sea slugs) and Pulmonata (e.g., land snails). This group was later renamed Euthyneura to re ect the detorted arrangement of the cerebrovisceral commisures [22], but Heterobranchia was rede ned to include Euthyneura and a grouping of taxa that are generally referred to as the "lower Heterobranchia" or Allogastropoda [23,24] including Pyramidelloidea, Architectonicoidea, Valvatidae, Omalogyridae, Rissoellidae, Glacidorbidae, Tjaernoiidae, Cimidae, Rhodopemorpha, and Murchisonellidae [20,21,[23][24][25][26][27][28][29]. Opisthobranchia has since been demonstrated to be a non-monophyletic group as sea slug clades such as Sacoglossa and Acochlidia share a more recent common ancestor with the pulmonates than other sea slugs [7,12,21,30,31], reviewed by [18].…”

Section: Introductionmentioning

confidence: 99%

Assessment of mitochondrial genomes for heterobranch gastropod phylogenetics

Varney

Brenzinger

Malaquias³

et al. 2020

Preprint

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● Background: Heterobranchia is a diverse clade of marine, freshwater, and terrestrial gastropod molluscs. It includes such disparate taxa as nudibranchs, sea hares, bubble snails, pulmonate land snails and slugs, and a number of (mostly small-bodied) poorly known snails and slugs collectively referred to as the “lower heterobranchs.” Evolutionary relationships within Heterobranchia have been challenging to resolve and the group has been subject to frequent and significant taxonomic revision. Mitochondrial (mt) genomes can be a useful molecular marker for phylogenetics but, to date, sequences have been available for only a relatively small subset of Heterobranchia.● Results: To assess the utility of mitochondrial genomes for resolving evolutionary relationships within this clade, eleven new mt genomes were sequenced including representatives of several groups of “lower heterobranchs.” Phylogenetic analyses of concatenated matrices of the thirteen protein coding genes found weak support for most higher-level relationships even after several taxa with extremely high rates of evolution were excluded. Bayesian inference analysis with the CAT + GTR model resulted in a reconstruction that is much more consistent with the current understanding of heterobranch phylogeny than maximum likelihood analyses using site-homogeneous models. Interestingly, dramatic gene rearrangements were detected within and between multiple clades. However, a single gene order is conserved across the majority of heterobranch clades.● Conclusions: Mitochondrial genomes provide support for shallow nodes within Heterobranchia, but despite a relatively conserved gene order and recovery of a topology largely consistent with the current understanding of heterobranch phylogeny, mitochondrial genomes appear to be too variable to serve as good phylogenetic markers for resolving deeper splits within this clade.

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Section: Introductionmentioning

confidence: 99%

Assessment of mitochondrial genomes for heterobranch gastropod phylogenetics

Varney

Brenzinger

Malaquias³

et al. 2020

Preprint

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“…Positional homologies on this tetraneural structural plan and the neuroanatomy of key homologous features such as ganglia and major nerves could thus be used to compare widely separated and very different organisms within Mollusca. Three-dimensional visualization of anatomical features dramatically improves their potential for comparative study (Brenzinger et al 2014); to that end, we compiled a tomographic model of the central nervous system in the dentalid scaphopod Rhabdus rectius, including a new sensory organ. Three-dimensional visualization of anatomical features dramatically improves their potential for comparative study (Brenzinger et al 2014); to that end, we compiled a tomographic model of the central nervous system in the dentalid scaphopod Rhabdus rectius, including a new sensory organ.…”

Section: Introductionmentioning

confidence: 99%

“…Although several authors have touched upon this (Shigeno et al 2007;Faller et al 2012), it has never been attempted using a comprehensive data set at a high taxonomic level. Three-dimensional visualization of anatomical features dramatically improves their potential for comparative study (Brenzinger et al 2014); to that end, we compiled a tomographic model of the central nervous system in the dentalid scaphopod Rhabdus rectius, including a new sensory organ. This provides a foundation for understanding the highly modified nervous system of this unusual class, and an exploratory initial effort to establish a neurophylogenetic framework for this diverse phylum.…”

Section: Introductionmentioning

confidence: 99%

A neurophylogenetic approach provides new insight to the evolution of Scaphopoda

Sumner‐Rooney

Schrödl

Lodde-Bensch

et al. 2015

Evolution and Development

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The position of scaphopods in molluscan phylogeny remains singularly contentious, with several sister relationships supported by morphological and phylogenomic data: Scaphopoda + Bivalvia (Diasoma), Scaphopoda + Cephalopoda (Variopoda), and Scaphopoda + Gastropoda. Nervous system architecture has contributed significant insights to reconstructing phylogeny in the Mollusca and other invertebrate groups, but a modern neurophylogenetic approach has not been applied to molluscs, hampered by a lack of clearly defined homologous characters that can be unequivocally compared across the radical body plan disparity among the living clades. We present the first three-dimensional reconstruction of the anterior nervous system of a scaphopod, Rhabdus rectius, using histological tomography. We also describe a new putative sensory organ, a paired and pigmented sensory mantle slit. This structure is restricted to our study species and not a general feature of scaphopods, but it forms an integral part of the description of the nervous system in R. rectius. It also highlights the potential utility of neuro-anatomical characters for multiple levels of phylogenetic inference beyond this study. This potential has not previously been exploited for the thorny problem of molluscan phylogeny. The neuroanatomy of scaphopods demonstrates a highly derived architecture that shares a number of key characters with the cephalopod nervous system, and supports a Scaphopoda + Cephalopoda grouping.

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“…The feeding mode of extant murchisonellids has not been observed but they have been interpreted as having a similar ectoparasitic mode of life to that of pyramellids (Brenzinger et al . ). Given the ancestral, phylogenetic relationship (Kaim ) and similar functional morphologies to the Donaldinidae, this family is interpreted as having been ectoparasites.…”

Section: Donaldina? Erwini Sp Nov Figure J–lmentioning

confidence: 97%

Early Triassic benthic invertebrates from the Great Bank of Guizhou, South China: systematic palaeontology and palaeobiology

Foster

Lehrmann

Hirtz

et al. 2019

Papers in Palaeontology

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To further our understanding of the evolution, selectivity and ecological composition of marine communities following the latest Permian mass extinction, new collections from underrepresented regions in the immediate extinction aftermath are required. Here, we provide new systematic data and the first palaeobiological account of the benthic invertebrate community from the Great Bank of Guizhou, South China. We systematically describe three brachiopod species, 26 bivalve species, 11 gastropod species, 1 microconchid and 1 crinoid species. The descriptions include 5 new species; 2 bivalve species (Hoernesia? danisae, Atomodesma? hautmanni) and 3 gastropod species (Donaldina erwini, Cossmannina alfischeri and Vernelia samae). This is the most species-rich benthic community known so far from the extinction aftermath, which is typically characterized by a high proportion of Permian holdover genera and cosmopolitan taxa. Taxonomically, this community is different from coeval faunas with dissimilarity values >60%. Ecologically, however, this fauna is similar to faunas from the Dolomites (Italy) and East Greenland. This new data, therefore, suggests that the lower Griesbachian invertebrate faunas were taxonomically heterogeneous, whereas ecologically they were relatively homogenous. The marine community on the Great Bank of Guizhou records genera that survived the mass extinction event with some, but not all, recording a size reduction, that is, the Lilliput effect. The absence of large body fossils and the preferential survival of small species suggest that the mass extinction event was size-selective.

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Microanatomy of shelledKoloonellacf.minutissima(Laseron, 1951) (Gastropoda: ‘lower’ Heterobranchia: Murchisonellidae) does not contradict a sister-group relationship with enigmatic Rhodopemorpha slugs

Cited by 14 publications

References 64 publications

Assessment of mitochondrial genomes for heterobranch gastropod phylogenetics

Assessment of mitochondrial genomes for heterobranch gastropod phylogenetics

A neurophylogenetic approach provides new insight to the evolution of Scaphopoda

Early Triassic benthic invertebrates from the Great Bank of Guizhou, South China: systematic palaeontology and palaeobiology

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