Porifera Hexactinellida: On Euryplegma auriculare Schulze, 1886, and formation of a new order
Tabachnick, K.R.; Reiswig, H.M. (2000). Porifera Hexactinellida: On Euryplegma auriculare Schulze, 1886, and formation of a new order, in: Crosnier, A. (Ed.) Résultats des Campagnes MUSORSTOM 21. Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie, 184: pp. 39-52
In: Crosnier, A. (Ed.) (2000). Résultats des Campagnes MUSORSTOM 21. Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie, 184. Publications Scientifiques du Muséum: Paris. ISBN 2-85653-526-7. 813 pp.
In: Mémoires du Muséum national d'Histoire naturelle. Série A, Zoologie. Editions du Muséum: Paris. ISSN 0078-9747
Euryplegma auriculare, previously known off the coast of New Zealand, has recently been collected from the vicinity of New Caledonia, Fiji, Wallis and Futuna Islands. The description of spicules, structure and speculation on the origin of this species as well as reinvestigation of the related genera, Tretopleura and Fieldingia, has led to revision of the family Aulocalycidae and modification of its diagnosis. The scope of the family has been restricted to five genera: Euryplegma, Aulocalyx, Rhabdodictyon, Ijimadictyon, and Leioplegma. A new taxon Aulocalycoida, with the same rank as the orders Hexactinosa, Lychniscosa, Lyssacinosa, has been proposed to receive the reorganized family. It is distinguished by an aulocalycoid framework. The order Hexactinosa is thus restricted to include all of its former families except for the family Aulocalycidae. Two genera previously included in the Aulocalycidae, Tretopleura and Fieldingia, are reassigned because of their lack of an aulocalycoid framework. Tretopleura is referred to the hexactinose family Euretidae without a clear closest relative. Fieldingia (sensu stricto), still pooriy known, is provisionally referred to the order Reticulosa, as incertae sedis, and possibly represents the only extant member of that group. It has some similarity to the family Stromatidiidae, but cannot be included in that taxon with the limited information now available. The position of Reticulosa in relation to the more well-known recent Hexactinellida taxa remains unclear.
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