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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
Phragmoceras imbricatumManda (2008a), fig. 6G SM92
Phragmoceras imbricatumManda (2007), fig. 6AB SM78
Phragmoceras imbricatum SM95
Phragmoceras imbricatum SM52
Phragmoceras imbricatumManda (2008a), fig. 8B SM80
Phragmoceras imbricatumManda (2008a), fig. 6C SM57
Phragmoceras imbricatum SM54
Phragmoceras koneprusensisManda (2007), fig. 8 SM75
Phragmoceras labiosum SM72
Phragmoceras labiosum VF707
Phragmoceras labiosum VF706
Phragmoceras longum SM56
Phragmoceras muntheiManda (2007), fig. 3AB SM82
Phragmoceras munthei SM88
Phragmoceras munthei SM84
Phragmoceras munthei SM94
Phragmoceras munthei SM85
Phragmoceras muntheiManda (2007), fig. 3FG SM81
Phragmoceras muntheiManda (2007), fig. 3D SM86
Phragmoceras muntheiManda (2007), fig. 3E SM87

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