MarBEF Data System

WoRMS taxon details


1337  (

Owen, 1843


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  1. Subclass Hydroidolina
  2. Subclass Trachylinae
  3. Subclass Automedusae accepted as Trachylinae (synonym)
  4. Order Hydroida accepted as Hydroidolina (synonym)
  5. Infraclass Hydroidomedusae accepted as Hydroidolina (not a monophyletic group)
  6. Subclass Leptolida accepted as Hydroidolina (not a monophyletic group)
  7. Subclass Leptolinae accepted as Hydroidolina
  8. Subclass Milleporina accepted as Hydroidolina (unaccepted > unavailable name)
  9. Subclass Stylasterina accepted as Hydroidolina (unaccepted > unavailable name)
  10. Order Trachylina accepted as Trachylinae (spelling variant)
marine, brackish, fresh, terrestrial
recent + fossil
Owen, R., 1843. Lectures on the comparative anatomy and physiology of the invertebrate animals., available online at [details]   
WoRMS (2024). Hydrozoa. Accessed at: on 2024-05-24
2004-12-21 15:54:05Z
2009-04-28 06:22:10Z
2024-02-29 07:57:50Z

Creative Commons License The webpage text is licensed under a Creative Commons Attribution 4.0 License

original description Owen, R., 1843. Lectures on the comparative anatomy and physiology of the invertebrate animals., available online at [details]   

additional source Cartwright, P., & Collins, A. G. 2007. Class Hydrozoa. in: Daly, M., Brugler, M. R., Cartwright, P., Collins, A. G., Dawson, M. N., France, S. C., McFadden, C. S., Opresko, D. M., Rodriguez, E., Romano, S., & Stake, J. 2007. The phylum Cnidaria: A review of phylogenetic patterns and diversity 300 years after Linnaeus. Zootaxa 1668: 127-182., available online at
page(s): 153 [details]  Available for editors  PDF available [request] 

status source Collins, A. G. (2009). Recent insights into cnidarian phylogeny. <em>Smithsonian Contributions to the Marine Sciences.</em> 38: 139-149. [details]   
 Present  Inaccurate  Introduced: alien  Containing type locality 
From editor or global species database
Diagnosis Cnidaria with mostly epidermal gonads. Original life cycle includes a polyp and a medusa stage. The medusa stage develops the gonads. Polyps always without internal septae and pharynx, mostly radially symmetric. Medusae produced by budding from polyp stage, if such a stage is present. Medusa nearly always with a velum, without rhopalia. The original life cycle has been modified extensively: the medusa stage is often reduced to a mere appendage of the polyp stage, rarely completely reduced. In some orders the polyp stage is strongly or completely reduced. Polyp stages form often colonies of macroscopic size. Integrated colonies including polypoid and medusoid structures can also form complex colonies, giving them it the appearance of an individual organism. [details]


Dutch hydroïdpoliepenhydroïden  [details]
English hydrozoanshydromedusaehydroids  [details]
French hydroméduseshydraïres  [details]
German HydropolypenHydromedusen  [details]
Japanese ヒドロ虫綱  [details]
Swedish hydrozoer  [details]
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