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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
Euciphoceras AN553
Euciphoceras AN494
Eulytoceras anisoptychiumVašíček (1972), Pl. II, fig. 7 ZV13
Eulytoceras phestumVašíček (1972), Pl. II, fig. 1 ZV9
Eulytoceras phestum XB255
Eulytoceras phestumVašíček (1972), Pl. II, fig. 6 ZV12
Eulytoceras raricinctumVašíček (1972), Pl. II, fig. 2 ZV10
Euophidioceras rudens p1365
Euophidioceras p3848
Eupachydiscus insculensisVašíček (1992), Pl. III, fig. 1 YA2031
Eupachydiscus isculensisAD Vašíček (1992), nevyobrazený kus diskutovaný na str. 169 YA2009
Euphidioceras YA130
Euryrizoceras obesum (Barrande, 1866) JB624
Euryrizoceras obesum (Barrande, 1866) JB632
Euryrizoceras Foerste, 1930 YA3110
Euryrizocerina normata (Barrande, 1877)AD Manda a Turek (2009), kus použit pro měření (str. 764) SM383
Euryrizocerina normata (Barrande, 1877)Manda a Turek (2009), Fig. 7G, H a Fig. 3D, G a 2 A, B, E, F SM379
Euryrizocerina normata (Barrande, 1877)AD Manda a Turek (2009), měřený kus (str. 764) SM381
Euryrizocerina normata (Barrande, 1877)AD Manda a Turek (2009), měřený kus (str. 764) SM380
Euryrizocerina normata (Barrande, 1877)Manda a Turek (2009), Fig. 7D, E a Fig. 2C, D, G, H SM378
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]