Caenorhabditis monodelphis sp. n.: defining the stem morphology and genomics of the genus Caenorhabditis

Slos, Dieter; Sudhaus, Walter; Stevens, Lewis; Bert, Wim; Blaxter, Mark

doi:10.1186/s40850-017-0013-2

Cited by 39 publications

(69 citation statements)

References 49 publications

(58 reference statements)

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“…Our finding that the C. guadeloupensis + C. uteleia group is sister to the Elegans supergroup is consistent with the tree topology in Slos et al. () and provides evidence that the Drosophilae supergroup, as recovered by the analysis of Kiontke et al. (), is paraphyletic.…”

Section: Discussionsupporting

confidence: 91%

“…() mapped morphology onto a previous six‐gene phylogenetic tree and recently, Slos et al. () discussed the stem species pattern using a morphological comparison with the sister group Protoscapter.…”

Section: Resultsmentioning

confidence: 99%

“…Conversely, the ad ray is in the fifth position in Elegans supergroup species and basally branching species such as C. monodelphis (Slos et al. ) but not in C. guadeloupensis . The latter, such as C. plicata , C. drosophilae , the Angaria group, C. virilis , and C. vivipara , shows a dorsal ray in anteroposterior position 4 (Kiontke et al.…”

Section: Resultsmentioning

confidence: 99%

“…; Slos et al. ). The 10 species described here are sampled from all previously defined major clades in the genus, and include the second‐most early diverging Caenorhabditis, C. parvicauda .…”

Section: Discussionmentioning

confidence: 97%

“…; Slos et al. ). The sister relationship of C. brenneri and C. doughertyi , as recovered by BI and ML, was recovered in the analyses of Kiontke et al.…”

Section: Discussionmentioning

confidence: 97%

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Comparative genomics of 10 newCaenorhabditisspecies

et al. 2019

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The nematode Caenorhabditis elegans has been central to the understanding of metazoan biology. However, C. elegans is but one species among millions and the significance of this important model organism will only be fully revealed if it is placed in a rich evolutionary context. Global sampling efforts have led to the discovery of over 50 putative species from the genus Caenorhabditis , many of which await formal species description. Here, we present species descriptions for 10 new Caenorhabditis species. We also present draft genome sequences for nine of these new species, along with a transcriptome assembly for one. We exploit these whole‐genome data to reconstruct the Caenorhabditis phylogeny and use this phylogenetic tree to dissect the evolution of morphology in the genus. We reveal extensive variation in genome size and investigate the molecular processes that underlie this variation. We show unexpected complexity in the evolutionary history of key developmental pathway genes. These new species and the associated genomic resources will be essential in our attempts to understand the evolutionary origins of the C. elegans model.

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Section: Discussionsupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 97%

“…; Slos et al. ). The sister relationship of C. brenneri and C. doughertyi , as recovered by BI and ML, was recovered in the analyses of Kiontke et al.…”

Section: Discussionmentioning

confidence: 97%

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Comparative genomics of 10 newCaenorhabditisspecies

et al. 2019

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Caenorhabditisnematodes colonize ephemeral resource patches in neotropical forests

Sloat

Noble

Paaby

et al. 2022

Ecology and Evolution

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Factors shaping the distribution and abundance of species include life‐history traits, population structure, and stochastic colonization–extinction dynamics. Field studies of model species groups help reveal the roles of these factors. Species of Caenorhabditis nematodes are highly divergent at the sequence level but exhibit highly conserved morphology, and many of these species live in sympatry on microbe‐rich patches of rotten material. Here, we use field experiments and large‐scale opportunistic collections to investigate species composition, abundance, and colonization efficiency of Caenorhabditis species in two of the world's best‐studied lowland tropical field sites: Barro Colorado Island in Panamá and La Selva in Sarapiquí, Costa Rica. We observed seven species of Caenorhabditis , four of them known only from these collections. We formally describe two species and place them within the Caenorhabditis phylogeny. While these localities contain species from many parts of the phylogeny, both localities were dominated by globally distributed androdiecious species. We found that Caenorhabditis individuals were able to colonize baits accessible only through phoresy and preferentially colonized baits that were in direct contact with the ground. We estimate the number of colonization events per patch to be low.

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Dramatic evolution of body length due to postembryonic changes in cell size in a newly discovered close relative ofCaenorhabditis elegans

2018

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Understanding morphological diversity—and morphological constraint—has been a central question in evolutionary biology since its inception. Nematodes of the genus Caenorhabditis, which contains the well‐studied model organism C. elegans, display remarkable morphological consistency in the face of extensive genetic divergence. Here, we provide a description of the broad developmental patterns of a newly discovered species, C. sp. 34, which was isolated from fresh figs in Okinawa and which is among the closest known relatives of C. elegans. C. sp. 34 displays an extremely large body size; it can grow to be nearly twice as long as C. elegans and all other known members of the genus. Observations of the timing of developmental milestones reveal that C. sp. 34 develops about twice as slowly as C. elegans. Measurements of embryonic and larval size show that the size difference between C. sp. 34 and C. elegans is largely due to postembryonic events, particularly during the transition from larval to adult stages. This difference in size is not attributable to differences in germ line chromosome number or the number of somatic cells. The overall difference in body size is therefore largely attributable to changes in cell size via increased cytoplasmic volume. Because of its close relationship to C. elegans, the distinctness of C. sp. 34 provides an ideal system for the detailed analysis of evolutionary diversification. The context of over 40 years of C. elegans developmental genetics also reveals clues into how natural selection and developmental constraint act jointly to promote patterns of morphological stasis and divergence in this group.

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Caenorhabditis monodelphis sp. n.: defining the stem morphology and genomics of the genus Caenorhabditis

Cited by 39 publications

References 49 publications

Comparative genomics of 10 newCaenorhabditisspecies

Comparative genomics of 10 newCaenorhabditisspecies

Caenorhabditisnematodes colonize ephemeral resource patches in neotropical forests

Dramatic evolution of body length due to postembryonic changes in cell size in a newly discovered close relative ofCaenorhabditis elegans

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