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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Evolution of the claustrum in Cnidaria: comparative anatomy reveals that it is exclusive to some species of Staurozoa and absent in Cubozoa

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Miranda, Lucilia S. [1] ; Garcia-Rodriguez, Jimena [1] ; Collins, Allen G. [2] ; Morandini, Andre C. [1] ; Marques, Antonio C. [3, 1]
Total Authors: 5
[1] Univ Sao Paulo, Dept Zool, Inst Biociencias, Rua Matao, Travessa 14, 101 Cidade Univ, BR-05508090 Sao Paulo, SP - Brazil
[2] Smithsonian Inst, Natl Museum Nat Hist, Natl Marine Fisheries Serv, Natl Systemat Lab, Washington, DC 20560 - USA
[3] Univ Sao Paulo, Ctr Biol Marinha, Sao Paulo - Brazil
Total Affiliations: 3
Document type: Journal article
Source: ORGANISMS DIVERSITY & EVOLUTION; v. 17, n. 4, p. 753-766, DEC 2017.
Web of Science Citations: 0

The claustrum in Cnidaria is a tissue in the gastrovascular cavity delimited by a central layer of mesoglea surrounded by gastrodermis (i.e., gastrodermis-mesoglea-gastrodermis), without communication with epidermis. By dividing the gastrovascular cavity, the four claustra provide an additional level of complexity. The presence of claustra in Cubozoa and Staurozoa has been used as evidence supporting a close relationship between these two cnidarian classes. However, the detailed anatomy of the claustrum has never been comparatively analyzed, rendering the evolution of this character among Cnidaria and its homology in Staurozoa and Cubozoa uncertain. This study provides a comparative investigation of the internal anatomy of the claustrum in Staurozoa and Cubozoa, addressing its evolutionary history based on recent phylogenetic hypotheses for Cnidaria. We conclude that the claustrum is a character exclusive to some species of Staurozoa, with a homoplastic evolution in the class, and that the structure called the ``claustrum{''} in Cubozoa corresponds to the valve of gastric ostium, a structure at the base of the manubrium, which is also present in Staurozoa with and without claustrum. Thus, the claustrum cannot be a synapomorphy of a hypothetical clade uniting Staurozoa and Cubozoa, nor can its hypothetical presence in enigmatic fossils be used to support cubozoan affinities. (AU)

FAPESP's process: 10/50174-7 - Systematics, life cycle and reproductive patterns of jellyfishes (Cnidaria: Medusozoa: Cubozoa and Scyphozoa) in the Baixada Santista (São Paulo, Brazil)
Grantee:André Carrara Morandini
Support type: BIOTA-FAPESP Program - Regular Research Grants
FAPESP's process: 15/23695-0 - Homology relationships in Medusozoa (Cnidaria) based on the anatomy of the different stages of the life cycle
Grantee:Lucília Souza Miranda
Support type: Scholarships in Brazil - Post-Doctorate
FAPESP's process: 13/50484-4 - Biodiversity and distribution patterns of the Medusozoa form the South-Western Atlantic
Grantee:Antonio Carlos Marques
Support type: Regular Research Grants
FAPESP's process: 10/07362-7 - Evolution in Staurozoa: molecular, morphological, cnidome and developmental subsidies
Grantee:Lucília Souza Miranda
Support type: Scholarships in Brazil - Doctorate
FAPESP's process: 11/50242-5 - Dimensions of marine life: patterns and process of diversifications in planktonic and benthic cnidarians
Grantee:Antonio Carlos Marques
Support type: BIOTA-FAPESP Program - Thematic Grants
FAPESP's process: 15/21007-9 - Recognizing the diversity of jellyfishes (Medusozoa, Rhopaliophora)
Grantee:André Carrara Morandini
Support type: Regular Research Grants