Physonectae

Physonectae is a suborder of Siphonophores. In Japanese it is called 胞泳[3] (hōei).

This article is about The taxon of marine animals. For other uses, see Hoei (disambiguation).

Physonectae
illustration of Physophora hydrostatica
Scientific classification
Kingdom: Animalia
Phylum: Cnidaria
Class: Hydrozoa
Order: Siphonophorae
Suborder: Physonectae
Haeckel, 1888[1]
Families[2]

Like all siphonophores, members of Physonectae are composed of a colony of zooids. Physonect species typically have a pneumatophore (float) at the top, with a nectosome region beneath it.[2][4] The nectosome has many nectophores, or swimming bells,[2] that propel the colony in any direction.[4] The only exception are species in the genus Athorybia, which lack nectophores,[2] resembling members of Cystonectae. Past the nectosome is the siphosome, which contains hydrophyllia (protective bracts), gastrozooids (feeding polyps), gonophores (reproductive medusae), and palpons (polyps with suspected defensive and/or excretory functions).[2][4] These structures in the siphosome repeat in a pattern which is different for each species.[4] Each loop on the pattern is called a cormidium.[4]

References
  1. Haeckel, E. (1888). System der Siphonophoren auf phylogenetischer Grundlage entworfen. Jenaische Zeitschrift für Naturwissenschaft. 22: 1-46., available online at http://www.biodiversitylibrary.org/item/43887#page/11/mode/1up page(s): 38
  2. Schuchert, P. (2019). World Hydrozoa Database. Physonectae. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=135335 on 2019-03-11
  3. Japan Agency for Marine-Earth Science and Technology. (2009 onwards). Biological Information System for Marine Life (BISMaL). Accessed on 2018-11-21. available online at http://www.godac.jamstec.go.jp/bismal
  4. Dunn, Casey. "Siphonophores: Body Plan". Siphonophores. Retrieved 11 March 2019.
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