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INTRODUCTION

The Cystonectae is a suborder of siphonophores order, which is part of the Hydrozoa class which is within the Cnidaria phylum within the Animalia kingdom.[1]

The suborder Cystonectae includes the Portuguese man o' war (Physalia physalis) and Bathyphysa conifera, sometimes called the "flying spaghetti monster."


DIET

The nematocysts of Cystonectae, which are a component of their tentacles, are used for capturing prey. They can only penetrate soft exteriors, and are not adept at catching prey with harder outer-bodies such as that of shrimp. Their diet largely consists of fish larvae but can vary slightly depending on the species. Cystonectae have a lack of complexity in the nematocysts, which lessens the variety of foods they can eat. The Physalia physalis consume a variety of bigger fish such as eel larvae and certain small fish and cephalopods.[2]


REPRODUCTION

The reproduction of Cystonectae has been most studied in Physalia physalis. They are dioecious and within their gonophore, they either have female or male gametes. [3]Fertilization occurs in the open waters, outside of the organism.[4] Zoids, which are animals that are their own unit and live, came from individual buds along a stem[5]. And Cystonectae are all long-stemmed.[3]


ANATOMY

The Physalia physalis are a member of the pleuston, which are marine organisms with the ability to interact with the air at the surface of the water. The organism has a float which is gas filled and allows them to float to the very surface.[3] This is a unique feature of this order. They are also identifiable by not possessing swimming bells, which other orders have.[6] Cystonectae are also identifiable anatomically due to the presence of a pneumatophore and a siphosome and lacking a nectosome. This order also has a weaker defense system due to them lacking bracts, which is a shielding mechanism present in other clades.[7]

  1. ^ "WoRMS - World Register of Marine Species - Cystonectae". www.marinespecies.org. Retrieved 2022-04-26.
  2. ^ Purcell, Jennifer E. (1984). "The Functions of Nematocysts in Prey Capture by Epipelagic Siphonophores (Coelenterata, Hydrozoa)". Biological Bulletin. 166 (2): 310–327. doi:10.2307/1541219. ISSN 0006-3185.
  3. ^ a b c Munro, Catriona; Vue, Zer; Behringer, Richard R.; Dunn, Casey W. (2019-10-29). "Morphology and development of the Portuguese man of war, Physalia physalis". Scientific Reports. 9 (1): 15522. doi:10.1038/s41598-019-51842-1. ISSN 2045-2322.
  4. ^ Kurlansky, Mindy B. "Physalia physalis (Portuguese man-of-war)". Animal Diversity Web. Retrieved 2022-04-26.
  5. ^ "The evolution of colony-level development in the Siphonophora (Cnidaria:Hydrozoa)". link.springer.com. Retrieved 2022-04-25.
  6. ^ Gershwin, Lewis; et al. (2014). The Siphonophores. CSIRO Marine and Atmospheric Research: Hobart. p. 4. {{cite book}}: Explicit use of et al. in: |first= (help); line feed character in |publisher= at position 17 (help)
  7. ^ Dunn, Casey; et al. (2005). "Molecular Phylogenetics of the Siphonophora (Cnidaria), with Implications for the Evolution of Functional Specialization". Systematic Biology. 54: 916–935. {{cite journal}}: Explicit use of et al. in: |first= (help); line feed character in |title= at position 74 (help)