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| Belemnoids Temporal range:
| |
|---|---|
| |
| Well preserved diplobelid Clarkeiteuthis conocauda, showing arm hooks and outline of mantle | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Coleoidea |
| Superorder: | †Belemnoidea |
| Orders | |
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,[1] but, unlike the squid, they possessed ten arms of roughly equal length, and no tentacles.[2] The name "belemnoid" comes from the Greek word βέλεμνον, belemnon meaning "a dart or arrow" and the Greek word είδος, eidos meaning "form".[3]
Belemnoids include belemnites (which belong to the order Belemnitida), aulacocerids (order Aulacocerida), phragmoteuthids (order Phragmoteuthida), and diplobelids (order Diplobelida). Belemnoidea has been suggested to be paraphyletic by some authors.[4]
- ^ Lehmann, U. 1981. The Ammonites: Their life and their world. London: Cambridge University Press.
- ^ Doyle, P.; Shakides, E. V. (2004). "The Jurassic Belemnite Suborder Belemnotheutina". Palaeontology. 47 (4): 983–998. Bibcode:2004Palgy..47..983D. doi:10.1111/j.0031-0239.2004.00395.x. S2CID 129794707.
- ^ Webster's New Universal Unabridged Dictionary. 2nd ed. 1979.
- ^ Fuchs, Dirk; Iba, Yasuhiro; Tischlinger, Helmut; Keupp, Helmut; Klug, Christian (October 2016). "The locomotion system of Mesozoic Coleoidea (Cephalopoda) and its phylogenetic significance". Lethaia. 49 (4): 433–454. Bibcode:2016Letha..49..433F. doi:10.1111/let.12155. ISSN 0024-1164.