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An approach to the phylogenetic reconstruction of Amphidiscophora (Porifera: Hexactinellida)
Tabachnick, K.R.; Menshenina, L.L. (1999). An approach to the phylogenetic reconstruction of Amphidiscophora (Porifera: Hexactinellida). Mem. Queensl. Mus. 44: 607-615
In: Memoirs of the Queensland Museum. Queensland Museum: Brisbane. ISSN 0079-8835, more
Peer reviewed article  

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Keywords
    Animal morphology; Evolution; Marine invertebrates; Phylogeny; Taxonomy; Amphidiscophora [WoRMS]; Hexactinellida [WoRMS]; Porifera [WoRMS]

Authors  Top 
  • Tabachnick, K.R.
  • Menshenina, L.L.

Abstract
    Two phylogenetic lines characterise Amphidiscophora (Porifera: Hexactinellida): the Pheronematidae-Monorhaphididae line and Hyalonematidae line. Both are derived from a lophophytous, cup-like sponge with an atrial cavity and osculum. Changing the body shape of the ancestral form gives rise to difficulties in water transport, hence the development of special types of compensation is required. The Pheronematidae-Monorhaphididae line leads to a columnar body with compensation developed in the form of expansion of dermal and atrial surfaces which penetrate into each other. The Hyalonematidae line leads to a conical body shape in which compensations developed in the form of cavities, atrial depressions and septa. Various body shapes which correspond to all Recent genera and subgenera of Amphidiscophora are discussed, emphasising their phylogenetic relations.

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