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

Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM18
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM32
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM40
Cyrtocycloceras peccatum Marek	Marek (1971), text. fig. 8c	JM41
Cyrtocycloceras peccatum Marek	Marek (1971), Pl. V, fig. 2-4, Pl. VIII, fig. 4, text. fig. 6b	JM44
Cyrtocycloceras peccatum Marek	Marek (1971), Pl. VIII, fig. 3	JM16
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM17
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM29
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM35
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM39
Cyrtocycloceras peccatum Marek	Marek (1971), text. fig. 5	JM3
Cyrtocycloceras peccatum Marek	Marek (1971), Pl. V, fig. 1, Pl. VI, fig. 4	JM4
Cyrtocycloceras peccatum Marek	Marek (1971), Pl. VIII, fig. 2	JM5
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM43
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM45
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM46
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM47
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM23
Cyrtocycloceras peccatum Marek	Marek (1971), Pl. VIII, fig. 1	JM24
Cyrtocycloceras peccatum Marek	AD, Marek (1971)	JM33

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