Phylogeny of the Aplousobranchia (Tunicata: Ascidiacea)

Moreno, Tatiane Regina; Rocha, Rosana M.

doi:10.1590/s0101-81752008000200016

Cited by 13 publications

(20 citation statements)

References 50 publications

(51 reference statements)

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“…For example, Moreno and Rocha [50] presented a cladistic analysis of tunicate taxa on the level of traditionally recognised families. With the difficulties associated with coding for higher taxa and the principal reliance on characters traditionally used in this study, their resulting phylogeny was poorly resolved, with merely Stolidobranchiata and Aplousobranchiata of the traditionally recognised higher tunicate taxa being recovered as monophyletic.…”

Section: Discussionmentioning

confidence: 99%

“…With the difficulties associated with coding for higher taxa and the principal reliance on characters traditionally used in this study, their resulting phylogeny was poorly resolved, with merely Stolidobranchiata and Aplousobranchiata of the traditionally recognised higher tunicate taxa being recovered as monophyletic. Another attempt at cladistically analysing morphological characters by Moreno and Rocha [50] predominantly focused on the taxon Aplousobranchiata. Our present phylogenetic analysis is not intended as a comprehensive cladistic analysis of tunicate taxa but as a preliminary test for phylogenetic information content in a recently discovered sensory system.…”

Section: Discussionmentioning

confidence: 99%

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Evolutionary diversification of secondary mechanoreceptor cells in tunicata

et al. 2013

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Background: Hair cells are vertebrate secondary sensory cells located in the ear and in the lateral line organ. Until recently, these cells were considered to be mechanoreceptors exclusively found in vertebrates that evolved within this group. Evidence of secondary mechanoreceptors in some tunicates, the proposed sister group of vertebrates, has recently led to the hypothesis that vertebrate and tunicate secondary sensory cells share a common origin. Secondary sensory cells were described in detail in two tunicate groups, ascidians and thaliaceans, in which they constitute an oral sensory structure called the coronal organ. Among thaliaceans, the organ is absent in salps and it has been hypothesised that this condition is due to a different feeding system adopted by this group of animals. No information is available as to whether a comparable structure exists in the third group of tunicates, the appendicularians, although different sensory structures are known to be present in these animals.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Evolutionary diversification of secondary mechanoreceptor cells in tunicata

et al. 2013

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“…They are present in all members belonging to Phlebobranchiata and in P. atlanticum (Fig. a), D. violacea and members of the genus Polyclinum (Van Name, ; Berrill, ; Moreno and Rocha, ; Groepler, ). Papillae at intersections of transverse and longitudinal vessels (to avoid confusion with papillae described in character 44, the term LV‐papillae is used here): (0) absent; (1) present. LV‐papillae bulge into the branchial basket at the intersections of transverse and longitudinal vessels thus projecting above the level of the internal longitudinal vessels, as spoon or sickle‐shaped, free‐standing papillae (Fig.…”

Section: List Of Charactersmentioning

confidence: 99%

“…The most interesting finding in this study had been the possible closer relationship of Appendicularia to Aplousobranchiata, a sister‐group relationship also supported in the parsimony analysis of 18S rDNA sequences, cox1‐mtDNA sequences combined with morphological characters. Moreno and Rocha () published the largest morphological dataset so far. Their analysis focused on the inter‐relationships of “genera” in the ascidian subtaxon Aplousobranchiata.…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic analysis of phenotypic characters of Tunicata supports basal Appendicularia and monophyletic Ascidiacea

2019

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With approximately 3000 marine species, Tunicata represents the most disparate subtaxon of Chordata. Molecular phylogenetic studies support Tunicata as sister taxon to Craniota, rendering it pivotal to understanding craniate evolution. Although successively more molecular data have become available to resolve internal tunicate phylogenetic relationships, phenotypic data have not been utilized consistently. Herein these shortcomings are addressed by cladistically analyzing 117 phenotypic characters for 49 tunicate species comprising all higher tunicate taxa, and five craniate and cephalochordate outgroup species. In addition, a combined analysis of the phenotypic characters with 18S rDNA-sequence data is performed in 32 OTUs. The analysis of the combined data is congruent with published molecular analyses. Successively up-weighting phenotypic characters indicates that phenotypic data contribute disproportionally more to the resulting phylogenetic hypothesis. The strict consensus tree from the analysis of the phenotypic characters as well as the single most parsimonious tree found in the analysis of the combined dataset recover monophyletic Appendicularia as sister taxon to the remaining tunicate taxa. Thus, both datasets support the hypothesis that the last common ancestor of Tunicata was free-living and that ascidian sessility is a derived trait within Tunicata. "Thaliacea" is found to be paraphyletic with Pyrosomatida as sister taxon to monophyletic Ascidiacea and the relationship between Doliolida and Salpida is unresolved in the analysis of morphological characters; however, the analysis of the combined data reconstructs Thaliacea as monophyletic nested within paraphyletic "Ascidiacea". Therefore, both datasets differ in the interpretation of the evolution of the complex holoplanktonic life history of thaliacean taxa. According to the phenotypic data, this evolution occurred in the plankton, whereas from the combined dataset a secondary transition into the plankton from a sessile ascidian is inferred. Besides these major differences, both analyses are in accord on many phylogenetic groupings, although both phylogenetic reconstructions invoke a high degree of homoplasy. In conclusion, this study represents the first serious attempt to utilize the potential phylogenetic information present in phenotypic characters to elucidate the inter-relationships of this diverse marine taxon in a consistent cladistic framework.

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“…Furthermore, the original classification of Lahille (1886), which classified the ascidian species into the orders Aplousobranchia, Phlebobranchia, and Stolidobranchia according to the structure of the branchial sac, is supported by molecular phylogeny and is currently accepted by most taxonomists (Shenkar and Swalla 2011). However, there are still different views on the placement of several families into orders, and the phylogenetic relationships within the ascidians remain fuzzy (Turon and López-Legentil 2004, Moreno et al 2008, Pérez-Portela et al 2009, Tsagkogeorga et al 2009, Shenkar et al 2016a). …”

Section: Introductionmentioning

confidence: 99%

Ascidiacea (Chordata: Tunicata) of Greece: an updated checklist

Antoniadou¹,

Gerovasileiou²,

Bailly³

2016

BDJ

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BackgroundThe checklist of the ascidian fauna (Tunicata: Ascidiacea) of Greece was compiled within the framework of the Greek Taxon Information System (GTIS), an application of the LifeWatchGreece Research Infrastructure (ESFRI) aiming to produce a complete checklist of species recorded from Greece. This checklist was constructed by updating an existing one with the inclusion of recently published records. All the reported species from Greek waters were taxonomically revised and cross-checked with the Ascidiacea World Database.New informationThe updated checklist of the class Ascidiacea of Greece comprises 75 species, classified in 33 genera, 12 families, and 3 orders. In total, 8 species have been added to the previous species list (4 Aplousobranchia, 2 Phlebobranchia, and 2 Stolidobranchia). Aplousobranchia was the most speciose order, followed by Stolidobranchia. Most species belonged to the families Didemnidae, Polyclinidae, Pyuridae, Ascidiidae, and Styelidae; these 4 families comprise 76% of the Greek ascidian species richness. The present effort revealed the limited taxonomic research effort devoted to the ascidian fauna of Greece, which is attributed to the lack of experts and low sampling effort. Therefore, major knowledge gaps on the ascidian diversity of Greece occur and further research in this field is needed.

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Phylogeny of the Aplousobranchia (Tunicata: Ascidiacea)

Cited by 13 publications

References 50 publications

Evolutionary diversification of secondary mechanoreceptor cells in tunicata

Evolutionary diversification of secondary mechanoreceptor cells in tunicata

Phylogenetic analysis of phenotypic characters of Tunicata supports basal Appendicularia and monophyletic Ascidiacea

Ascidiacea (Chordata: Tunicata) of Greece: an updated checklist

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