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Annelids

      The annelids (also called "ringed worms"), formally called Annelida (from French annelés "ringed ones", ultimately from Latin anellus "little ring"), are a large phylum of segmented worms, with over 17,000 modern species including ragworms, earthworms and leeches. They are found in marine environments from tidal zones to hydrothermal vents, in freshwater, and in moist terrestrial environments. Although most textbooks still use the traditional division into polychaetes (almost all marine), oligochaetes (which include earthworms) and leech-like species, research since 1997 has radically changed this scheme, viewing leeches as a sub-group of oligochaetes and oligochaetes as a sub-group of polychaetes. In addition, the Pogonophora, Echiura and Sipuncula, previously regarded as separate phyla, are now regarded as sub-groups of polychaetes. Annelids are considered members of the Lophotrochozoa, a "super-phylum" of protostomes that also includes molluscs, brachiopods, flatworms and nemerteans.

Source: http://en.wikipedia.org/wiki/Annelid
Xanioprion Kielan - Jaworowska, 1962Tonarová et al. (2012), fig. 4.Zfoto PT7
Xanioprion sp. A sensu Tonarová et al (2012)AD Tonarová et al. (2012) PT19
Xanioprion sp. A sensu Tonarová et al (2012)Tonarová et al (2012), fig. 4Sfoto PT5
Xanioprion sp. A sensu Tonarová et al (2012)Tonarová et al. (2012), fig. 4.T PT26
Xanioprion sp. A sensu Tonarová et al (2012)AD Tonarová et al. (2012)foto PT9
Xanioprionidae indet.AD Tonarová et al. (2012) PT13
Xanioprionidae indet.AD Tonarová et al. (2012)foto PT7
Xanioprionidae indet. PT1
Xanioprionidae indet.AD Tonarová et al. (2012) PT20
Xanioprionidae indet.AD Tonarová et al. (2012) PT24

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