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Stylophora (Stylophorans)

      The stylophorans are an extinct, possibly polyphylletic group allied to the echinoderms, comprising the cornutes and mitrates.It is synonymous with the subphylum Calcichordata. The general stylophoran body plan consists of a flattened theca and a single jointed appendage which extends from it. Stylophoran tests are composed of stereom calcite plates like an echinoderm, which has traditionally been the basis for assigning them to Echinodermata. However, they also lack the radial symmetry characteristic of most other echinoderms, with the earlier members of the group being flattened and asymmetrical, and the later ones closer to bilateral symmetry. In Mitrocystites and perhaps in other forms its stem does not end in an attachment organ, and the stem more likely served the organism as a tail for movement. Cothurnocystis is asymmetrical and boot-shaped, and Mitrocystites is bilaterally symmetrical and more streamlined. It has additionally been suggested that some or all of its members might have had gill slits like a chordate, and that their stems contained a notochord.This reconstruction leads to the alternative hypothesis that some or all of the stylophorans may have been ancestral to the chordate branch of the deuterostomes, rather than being within the echinoderms.

Source
http://en.wikipedia.org/wiki/Stylophora
Thoralicarpus prokopi Lefebvre et al., 2021Lefebvre et al. (2021), Fig 93.c. OZ201
Thoralicarpus prokopi Lefebvre et al., 2021Lefebvre et al. (2021), Fig. 98.e. OZ203
Thoralicarpus prokopi Lefebvre et al., 2021Lefebvre et al. (2021), Fig. 97.c. OZ205
Thoralicarpus prokopi Lefebvre et al., 2021 OZ208
Thoralicarpus prokopi Lefebvre et al., 2021Lefebvre et al. (2021), Fig.96.f. OZ189
Thoralicarpus prokopi Lefebvre et al., 2021Lefebvre et al. (2021), Fig.97.e. OZ192
Thoralicarpus prokopi Lefebvre et al., 2021 OZ193
Thoralicarpus prokopi Lefebvre et al., 2021Lefebvre et al. (2021), Fig 96.c. OZ195
Thoralicarpus prokopi Lefebvre et al., 2021Lefebvre et al. (2021), Fig. 97.f. OZ207
Thoralicarpus prokopi Lefebvre et al., 2021 OZ204
Thoralicarpus OZ295
stylophora
Img. 85: Morphology of Stylophorans (after Ruta 2003)
Stylophorata
Img. 85:
Virtual museum of the Czech Geological Survey, www.geology.cz, (C) Czech Geological Survey, 2011, v.0.99 [13.12.2011]