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Cephalopods

      A cephalopod is any member of the molluscan class Cephalopoda (Greek plural Κεφαλόποδα (kephalópoda); "head-feet"). These exclusively marine animals are characterized by bilateral body symmetry, a prominent head, and a set of arms or tentacles (muscular hydrostats) modified from the primitive molluscan foot. Fishermen sometimes call them inkfish, referring to their common ability to squirt ink. The study of cephalopods is a branch of malacology known as teuthology. Cephalopods became dominant during the Ordovician period, represented by primitive nautiloids. The class now contains two, only distantly related, extant subclasses: Coleoidea, which includes octopuses, squid, and cuttlefish; and Nautiloidea, represented by Nautilus and Allonautilus. In the Coleoidea, the molluscan shell has been internalized or is absent, whereas in the Nautiloidea, the external shell remains. About 800 living species of cephalopods have been identified. Two important extinct taxa are the Ammonoidea (ammonites) and Belemnoidea (belemnites).

Source: http://en.wikipedia.org/wiki/Cephalopod
Acanthoceras fleuriausianum p2599
Acanthoceras mantelli YA772
Acanthoceras mantelli p2469
Acanthoceras mantelli YA761
Acanthoceras mantelli YA766
Acanthoceras ornatissimum p5113
Acanthoceras rotomagense p4076
Acanthoceras roudnicensis p2468
AcanthoptychocerasVašíček (1972), Pl. V, fig. 3 ZV26
Acanthoptychoceras spinatocostatumVašíček (1972), Pl. VI, fig. 3 ZV29
Acanthoptychoceras spinatocostatumVašíček (1972), Pl. V, fig. 2 ZV25
Acrioceras (Acrioceras) tabarelliVašíček (1972), Pl. III, fig. 3 ZV16
Acrograptus liptovienseVašíček (1972), Pl. XIV, fig. 4 ZV62
Actinocamax plenus p3969
Actinocamax plenus p3962
Actinocamax plenus p3970
Actinocamax plenus p3961
Acutimitoceras intermedium (Schindewolf, 1923) XA945
Agoniatidae p3792
Agoniatites (Agoniatites) costulatus p5091

Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]