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Higher-level metazoan relationships: recent progress and remaining questions
The relationships of the five main metazoan lineages—Porifera, Ctenophora, Placozoa, Cnidaria and Bilateria—remain subject to conflicting topologies according to different taxonomic samples and analytical approaches.
Spiralian Phylogeny Informs the Evolution of Microscopic Lineages
Phylogeny and systematics of Aphroditiformia
- Brett C. Gonzalez, Alejandro Martínez, Elizabeth Borda, T. Iliffe, D. Eibye‐Jacobsen, K. Worsaae
- BiologyCladistics : the international journal of the…
- 1 June 2018
Aphroditiformia represents one of the most successful radiations of annelids, and is therefore an interesting model to understand morphological and functional evolution and is addressed through the analysis of four molecular markers and 87 morphological characters sampled across 127 species under the assumptions of parsimony and model‐based methods.
Acquisition of Dwarf Male “Harems” by Recently Settled Females of Osedax roseus n. sp. (Siboglinidae; Annelida)
- G. Rouse, K. Worsaae, S. Johnson, W. J. Jones, R. Vrijenhoek
- BiologyThe Biological Bulletin
- 1 February 2008
A time-series analysis revealed the presence of a new species of Osedax, a genus of bone-eating siboglinid annelids, which is the fifth species described since the erection of this genus and, like its congeners, uses a ramifying network of “roots” to house symbiotic bacteria.
An Anatomical Description of a Miniaturized Acorn Worm (Hemichordata, Enteropneusta) with Asexual Reproduction by Paratomy
The interstitial environment of marine sandy bottoms is a nutrient-rich, sheltered habitat whilst at the same time also often a turbulent, space-limited, and ecologically challenging environment…
CLSM analysis of the phalloidin‐stained muscle system in Nerilla antennata, Nerillidium sp. and Trochonerilla mobilis (Polychaeta; Nerillidae)
The results support the belief that absence of circular muscles in the polychaete body wall is much more widely distributed than is currently presumed.
Is Diurodrilus an annelid?
On the basis of the configuration of the nervous system and the cuticle Diurodrilus is regarded to belong to Spiralia, possibly close to Annelida; however, until further evidence is acquired it should be regarded as incertae sedis in this large animal clade.
Patterns of Diversity in Soft-Bodied Meiofauna: Dispersal Ability and Body Size Matter
The macroecological analysis of meiofauna indicates that not only body size but mostly dispersal ability and also occurrence in the endobenthic habitat are important correlates of diversity for these understudied animals, with different importance at different spatial scales.
Convergent evolution of the ladder-like ventral nerve cord in Annelida
A ladder-like appearance of the ventral nerve cord evolved repeatedly, and independently of the transition from an intraepidermal to a subepidersmal cord during annelid evolution, to propose an alternative set of neuroanatomical characteristics for the last common ancestor of Annelida or perhaps even Spiralia.
Evolution of cave Axiokebuita and Speleobregma (Scalibregmatidae, Annelida)
The results support two independent cave colonization events, favoured by the preadaptation of the members of Axiokebuita–Speleobregma lineage to crevicular habitats.