View source for Cycloteuthis sirventi

{{Short description|Species of squid}}
{{Speciesbox
| taxon = Cycloteuthis sirventi
| authority = [[Louis Joubin|Joubin]], 1919<ref name = WoRMS>{{cite web | url = http://www.marinespecies.org/aphia.php?p=taxdetails&id=139472 | title = ''Cycloteuthis sirventi'' Joubin, 1919 | publisher = Flanders Marine Institute | author = Julian Finn| year = 2016 | work = World Register of Marine Species}}</ref>
| synonyms =
}}
'''''Cycloteuthis sirventi,''''' commonly known as Sirvent's disc-fin squid,<ref>[https://www.fao.org/4/i1920e/i1920e.pdf CEPHALOPODS-Vol2.vp (fao.org)]</ref> is a species of [[squid]] in the family [[Cycloteuthidae]], of which it is the most common. It is possible that [[Cycloteuthis akimushkini|''C. akimushkini'']] is a [[junior synonym]] of ''C. sirventi''. The species occurs in the tropical to polar western [[Atlantic Ocean]]. It has a maximum mantle length of 500mm.
== Description ==
As described by Joubin, ''C. sirventi'' is a relatively small squid. Its mantle is [[conical]] shaped, and tapers towards a sharp point. The [[Mantle (mollusc)|mantle]] wall is thin, with gelatinous [[connective tissue]] between an inner and outer wall of muscle.<ref name=":0">[https://repository.si.edu/bitstream/handle/10088/5713/SCtZ-0005-Lo_res.pdf?sequence=2&isAllowed=y SCtZ-0005-Lo_res.pdf (si.edu)]</ref> The fins are long and [[Ellipse|elliptical]] shaped, taking up about 80% of the overall mantle length. The lengths of the arms are about 85% of the mantle length, according to the largest specimens. The [[Tentacle|tentacles]] are long and robust, their clubs bearing four rows of suckers.
''C. sirventi'' [[Larva|larvae]] are elongated, with small terminal fins. The [[Photophore|photophores]] are not present in the eyes, which protrude greatly.
== History ==
Until lately, this species was only known from one specimen taken in 1912.<ref>[https://oceanrep.geomar.de/id/eprint/34483/ A new species of the genus Cycloteuthis (Cephlopoda: Oegopsida). - OceanRep (geomar.de)]</ref>
In 1919, [[Louis Joubin]] described a new genus and the species, ''C. sirventi'', and stated that it was closely related to [[Lycoteuthis diadema]], a synonym of [[Lycoteuthis lorigera]]. He placed these two in a family called Parateuthidae.<ref name=":0" /> Later, in 1921, Thiele created the [[Parateuthis]] genus based off a larval [[Oegopsida]] captured in the Antarctic Ocean.<ref name=":0" /><ref>[https://www.marinespecies.org/aphia.php?p=taxdetails&id=342379 WoRMS - World Register of Marine Species - Parateuthis tunicata Thiele, 1921]</ref> However, this genus holds no connection to Joubin's Parateuthidae family.
Shortly after, Naef transferred ''Lycoteuthis'' to the [[Enoploteuthidae]].<ref>[http://tolweb.org/Lycoteuthidae Lycoteuthidae (tolweb.org)]</ref> Later he established a subfamily for ''Cycloteuthis'', Cycloteuthinae.
==References==
{{Reflist}}
==External links==
*[http://tolweb.org/Cycloteuthis/19620 Tree of Life web project: ''Cycloteuthis sirventyi'']
*[http://www.sealifebase.org/summary/SpeciesSummary.php?id=58180&lang=English SeaLifeBase: ''Cycloteuthis sirventi'']
{{Taxonbar|from=Q3200081}}
[[Category:Cycloteuthidae]]
[[Category:Cephalopods described in 1919]]
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