Reassessment of the classification of the Order Haplosclerida (Class Demospongiae, Phylum Porifera) using 18S rRNA gene sequence data

Redmond, Niamh E.; Soest, R.W.M. van; Kelly, Michelle; Raleigh, Jean; Travers, Simon; McCormack, Grace P.

doi:10.1016/j.ympev.2006.10.021

Cited by 65 publications

(76 citation statements)

References 21 publications

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“…Recent molecular phylogenies (e.g., Borchiellini et al, 2004;Erpenbeck and Wörheide, 2007;Kober and Nichols, 2007;Redmond et al, 2007;Erpenbeck et al, 2009) consistently show the basal groups to be those including aspiculate demosponges (Keratosa and Myxospongiaea of Borchiellini et al, 2004). Borchiellini et al (2004) assessed their trees for morphological characters including spicule morphology, and found that among spiculate taxa, diactines were basal, with tetraxonids in their analysis occurring in a single branch.…”

Section: Relationships Of Group Two Protomonaxonids To Extant Demospomentioning

confidence: 99%

Relationships of the Cambrian Protomonaxonida (Porifera)

Botting

Muir

Lin

2013

Palaeontologia Electronica

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The Protomonaxonida consist of a heterogeneous group of early fossil sponges traditionally assigned to the demosponges. However, an affinity to the hexactinellid-like Reticulosa has also been suggested, and their relationships are potentially critical to understanding the origins of the extant sponge classes. In this paper, the relationships of the protomonaxonid sponges to each other and to other sponge groups have been reassessed, using previously described specimens as well as new material from the Burgess Shale of Canada and the Hetang Biota of South China. The sponges fall into two coherent groups, one consisting of taxa with long, mostly sub-longitudinal spicules, and the other with complex arrays composed of tracts of minute (millimetre-scale) monaxons, which grade into aspiculate taxa such as the Vauxiidae. Previous ideas relating the Protomonaxonida to extant demosponge lineages are supported in the case of the second group, whereas the first group confirms the view of derivation from a hexactinellid-like ancestor. Whether the two groups were directly related or evolved monaxonid spiculation in parallel is currently uncertain.

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Section: Relationships Of Group Two Protomonaxonids To Extant Demospomentioning

confidence: 99%

Relationships of the Cambrian Protomonaxonida (Porifera)

Botting

Muir

Lin

2013

Palaeontologia Electronica

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“…Alternative gene trees such as 28S rDNA and 18S rDNA (e.g. McCormack et al, 2002;Redmond et al, 2007) repeatedly showed the monophyly of (marine) Haplosclerida, but the internal topologies did not resemble the morphological classification either. A demosponge-wide comparison of 28S rDNA sequences indicated a significantly higher evolutionary rate .…”

Section: Haplosclerida Phylogenymentioning

confidence: 99%

Towards a DNA taxonomy of Caribbean demosponges: a gene tree reconstructed from partial mitochondrial CO1 gene sequences supports previous rDNA phylogenies and provides a new perspective on the systematics of Demospongiae

et al. 2007

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We present the most comprehensive cytochrome oxidase subunit 1 gene tree published to date for demosponges based on new sequences. The CO1 barcoding fragment is sequenced for 65 species from the Caribbean Sea, and its gene tree reconstructed. Although its deeper nodes are not particularly well-supported, the gene tree provides a variety of information for new phylogenetic patterns, as well as support for previously published 28S rDNA gene trees. In our analysis Halichondriidae cluster with Suberitidae, supporting previous 28S rDNA data. Chelae-bearing Poecilosclerida are monophyletic but most taxa lacking chelae in this dataset cluster more distantly. Haplosclerida are not resolved monophyletically under this fragment. While some species exhibit distinct barcodes, some genera contain species that share CO1 haplotypes.

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“…Nonetheless, until recently, all molecular data have suggested that the freshwater sponges are monophyletic (e.g. Addis and Peterson, 2005;Redmond et al, 2007).…”

Section: Introductionmentioning

confidence: 99%