Cycloteuthidae is a family

Family (biology)

In biological classification, family is* a taxonomic rank. Other well-known ranks are life, domain, kingdom, phylum, class, order, genus, and species, with family fitting between order and genus. As for the other well-known ranks, there is the option of an immediately lower rank, indicated by the...

 in the order Teuthida, comprising two genera

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

. While physically dissimilar, molecular evidence supports the relatedness of the genera. The family is found primarily in mesopelagic

Mesopelagic

The mesopelagic is that part of the pelagic zone that extends from a depth of 200 to 1000 metres below the ocean surface. It lies between the photic epipelagic above and the aphotic bathypelagic below, where there is no light at all...

 tropical to subtropical waters. Cycloteuthidae is characterised by a triangular funnel-locking apparatus.

Species

• Genus Cycloteuthis
  Cycloteuthis
  Cycloteuthis is a genus of squid in the family Cycloteuthidae. It is distinguished from the genus Discoteuthis by the presence of a tail on the mantle. The species C. akimushkini is currently considered a junior synonym of C. sirventi, however this is inconclusive.-External links:*...
  
  
  • Cycloteuthis akimushkini *
  • Cycloteuthis sirventi
    Cycloteuthis sirventi
    Cycloteuthis sirventi is a species of squid in the family Cycloteuthidae, of which it is the most common. It is possible that C. akimushkini is a junior synonym of C. sirventi. The species occurs in the tropical to polar western Atlantic Ocean....
    
    *
• Genus Discoteuthis
  Discoteuthis
  Discoteuthis is a genus of squid in the family Cycloteuthidae. It is distinguished from the genus Cycloteuthis by the absence of a tail on the mantle. The genus occurs in tropical and subtropical oceans worldwide.-External links:*...
  
  
  • Discoteuthis discus
    Discoteuthis discus
    Discoteuthis discus is a species of squid in the family Cycloteuthidae. They occur in the tropical and subtropical Atlantic Ocean and the central North Pacific. While mature specimens have not been found, the unnamed species Discoteuthis sp. A has been hypothesised as the mature form.-External...
    
    *
  • Discoteuthis laciniosa
    Discoteuthis laciniosa
    Discoteuthis laciniosa is a species of squid in the family Cycloteuthidae. The species occurs throughout the Atlantic, Indian and Pacific Oceans.-External links:...
    
    
  • Discoteuthis sp. A *
  • Discoteuthis sp. B

The entries listed above with an asterisk (*) are questionable and need further study to determine if they are valid or synonyms.

External links

• Tree of Life web project: Cycloteuthidae