Belemnites may refer to:
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Belemnoids are an extinct group of marine cephalopod, very similar in many ways to the modern squid and closely related to the modern cuttlefish. Like them, the belemnoids possessed an ink sac, but, unlike the squid, they possessed ten arms of roughly equal length, and no tentacles. The name "belemnoid" comes from the Greek word βέλεμνον, belemnon meaning "a dart or arrow" and the Greek word είδος, eidos meaning "form".
Belemnotheutis, is an extinct coleoid cephalopod genus from the middle and upper Jurassic, related to but morphologically distinct from belemnites. Belemnotheutis fossils are some of the best preserved among coleoids. Remains of soft tissue are well-documented in some specimens, even down to microscopic muscle tissue. In 2008, a group of paleontologists even recovered viable ink from ink sacs found in several specimens.
Bactritimimus is a genus of belemnite from the Mississippian Epoch.
Actinocamax is a genus of belemnite, an extinct group of cephalopods.
Aulacoceras is a genus of belemnite, an extinct group of cephalopods.
Belemnopsis is a genus of belemnite, an extinct group of cephalopods.
Calliconites is a genus of belemnite, an extinct group of cephalopods.
Conoteuthis is a genus of belemnite, an extinct group of cephalopods.
Curtohibolites is a genus of belemnite, an extinct group of cephalopods.
Dicoelites is a genus of belemnite, an extinct group of cephalopods.
Diplobelus is a genus of belemnite, an extinct group of cephalopods.
Hastites is a genus of belemnite, an extinct group of cephalopods.
Hibolites is a genus of belemnite, an extinct group of cephalopods.
Neohibolites is a genus of belemnite, an extinct group of cephalopods.
Passaloteuthis is a genus of belemnite, an extinct group of cephalopods.
Permoteuthis is a genus of belemnite, an extinct group of cephalopods.
Prographularia is a genus of belemnite, an extinct group of cephalopods.
Youngibelus is a genus of belemnite, an extinct group of cephalopods.
Belemnitida is an extinct order of squid-like cephalopods that existed from the Late Triassic to Late Cretaceous. Unlike squid, belemnites had an internal skeleton that made up the cone. The parts are, from the arms-most to the tip: the tongue-shaped pro-ostracum, the conical phragmocone, and the pointy guard. The calcitic guard is the most common belemnite remain. Belemnites, in life, are thought to have had 10 hooked arms and a pair of fins on the guard. The chitinous hooks were usually no bigger than 5 mm (0.20 in), though a belemnite could have had between 100 and 800 hooks in total, using them to stab and hold onto prey.
Belemnites is a genus of an extinct group of cephalopods belonging to the order Belemnitida. These cephalopods existed in the Early Jurassic period from the Hettangian age to the Toarcian age (175.6–183.0). They were fast-moving nektonic carnivores.