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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
Gyroceratites Ich5816
GyroceratitesAD Budil et al. (2013) PB848
Gyroceratites Ich5822
Hamulina asterianaVašíček (1972), Pl. VII, fig. 3 ZV32
Hamulinites fragile XB260
Hamulinites parvulusVašíček (1972), Pl. VII, fig. 2 ZV31
Hemiphragmoceras pusilum JB447
Hercoceras mirum p275
Hercoceras mirum p3660
Hercoceras mirum SM431
Hercoceras mirumManda a Turek (2009), fig. 12G SM337
Hercoceras mirum p270
Hercoceras mirumManda a Turek (2011), fig. 4C SM372
Hercoceras mirumManda a Turek (2011), fig. 4B SM371
Hercoceras mirum p277
Hercoceras mirum p332
Hercoceras mirumManda a Turek (2011), fig. 4d p276
Hercoceras mirum p274
Hercoceras mirum p271
Hercoceras p6087
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]