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A specimen of the same species exhibiting an elongation of the penis to 67 cm in length. Cephalopods are a diverse group of species, but share common life history traits, for example, they have a rapid growth rate and short life spans. [106]
The cephalopods have a long geological history, with the first nautiloids found in late Cambrian strata. [1] The class developed during the middle Cambrian, and underwent pulses of diversification during the Ordovician period [2] to become diverse and dominant in the Paleozoic and Mesozoic seas. Small shelly fossils such as Tommotia were once ...
Nautilus. The nautilus (from Latin nautilus ' paper nautilus ', from Ancient Greek ναυτίλος nautílos 'sailor') [3] is an ancient pelagic marine mollusc of the cephalopod family Nautilidae. The nautilus is the sole extant family of the superfamily Nautilaceae and the suborder Nautilina . It comprises nine living species in two genera ...
In a broad sense, "nautiloid" refers to a major cephalopod subclass or collection of subclasses ( Nautiloidea sensu lato ). Nautiloids are typically considered one of three main groups of cephalopods, along with the extinct ammonoids (ammonites) and living coleoids (such as squid, octopus, and kin). While ammonoids and coleoids are monophyletic ...
It is now known that the colossal squid ( Mesonychoteuthis hamiltoni) attains an even greater maximum size. The giant squid seen here measured 9.24 m (30.3 ft) in total length and had a mantle length of 1.79 m (5.9 ft). Cephalopods, which include squids and octopuses, vary enormously in size.
Ammonoids are extinct spiral shelled cephalopods comprising the subclass Ammonoidea. They are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) than they are to shelled nautiloids (such as the living Nautilus ). [1] The earliest ammonoids appeared during the Devonian, with the last species vanishing during or soon ...
Spirula spirula is a species of deep-water squid -like cephalopod mollusk. It is the only extant member of the genus Spirula, the family Spirulidae, and the order Spirulida. Because of the shape of its internal shell, it is commonly known as the ram's horn squid [3] or the little post horn squid. Because the live animal has a light-emitting ...
Cameroceras is a cephalopod, the same group of molluscs that includes the octopuses, squids and cuttlefish. The only portion of the animal to fossilize is the shell (formally known as the conch). Like other orthoconic nautiloids, Cameroceras had a narrow conical shell with smooth, simple sutures dividing a series of septa (internal chambers ...