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Belemnoidea
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{{Short description|Extinct group of squid-like animals}} {{Automatic taxobox | name = Belemnoids | fossil_range = {{fossil range|Devonian|Cretaceous}} | image = Phragmoteuthis conocauda.JPG | image_caption = Well preserved diplobelid ''[[Clarkeiteuthis|Clarkeiteuthis conocauda]]'', showing arm hooks and outline of mantle | taxon = Belemnoidea | authority = | subdivision_ranks = Orders | subdivision = [[Aulacocerida]]<br /> [[Phragmoteuthida]]<br /> [[Belemnitida]]<br /> [[Diplobelida]] }} [[Image:BelemniteDB2.jpg|thumb|right|[[Paleoart|Artist's reconstruction]] of belemnoids.]] '''Belemnoids''' are an extinct group of marine [[cephalopod]], very similar in many ways to the modern [[squid]]. Like them, the belemnoids possessed an [[ink sac]],<ref>Lehmann, U. 1981. ''The Ammonites: Their life and their world''. London: Cambridge University Press.</ref> but, unlike the squid, they possessed ten [[Cephalopod arm|arms]] of roughly equal length, and no [[tentacle]]s.<ref>{{Cite journal| first1 = P.| first2 = E. V.| title = The Jurassic Belemnite Suborder Belemnotheutina| journal = Palaeontology| volume = 47| issue = 4| last1 = Doyle| pages = 983–998| year = 2004| doi = 10.1111/j.0031-0239.2004.00395.x| last2 = Shakides| doi-access = | bibcode = 2004Palgy..47..983D| s2cid = 129794707}}</ref> The name "belemnoid" comes from the Greek word βέλεμνον, ''belemnon'' meaning "a dart or arrow" and the Greek word είδος, ''eidos'' meaning "form".<ref>''Webster's New Universal Unabridged Dictionary.'' 2nd ed. 1979.</ref> Belemnoids include [[Belemnitida|belemnites]] (which belong to the [[Order (biology)|order]] [[Belemnitida]]), aulacocerids (order [[Aulacocerida]]), phragmoteuthids (order [[Phragmoteuthida]]), and diplobelids (order [[Diplobelida]]). Belemnoidea has been suggested to be paraphyletic by some authors.<ref>{{Cite journal |last1=Fuchs |first1=Dirk |last2=Iba |first2=Yasuhiro |last3=Tischlinger |first3=Helmut |last4=Keupp |first4=Helmut |last5=Klug |first5=Christian |date=October 2016 |title=The locomotion system of Mesozoic Coleoidea (Cephalopoda) and its phylogenetic significance |url=https://www.idunn.no/doi/10.1111/let.12155 |journal=Lethaia |language=en |volume=49 |issue=4 |pages=433–454 |doi=10.1111/let.12155 |bibcode=2016Letha..49..433F |issn=0024-1164|url-access=subscription }}</ref>
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