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

  • Lucília S. Miranda
  • Jimena García-Rodríguez
  • Allen G. Collins
  • André C. Morandini
  • Antonio C. Marques
Original Article

Abstract

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.

Keywords

Medusozoa Stauromedusae Stalked jellyfish Box jellyfish Histology 

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Copyright information

© Gesellschaft für Biologische Systematik 2017

Authors and Affiliations

  • Lucília S. Miranda
    • 1
  • Jimena García-Rodríguez
    • 1
  • Allen G. Collins
    • 2
  • André C. Morandini
    • 1
  • Antonio C. Marques
    • 1
    • 3
  1. 1.Departamento de Zoologia, Instituto de BiociênciasUniversidade de São PauloSão PauloBrazil
  2. 2.National Systematics Laboratory, National Marine Fisheries Service (NMFS), National Museum of Natural HistorySmithsonian InstitutionWashingtonUSA
  3. 3.Centro de Biologia MarinhaUniversidade de São PauloSão SebastiãoBrazil

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