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

Scotiaecystis jefferiesi Gil Cid, Domínguez, Silván & Escribano, 1996	Lefebvre et al. (2018)	LK16
Scotiaecystis jefferiesi Gil Cid, Domínguez, Silván & Escribano, 1996	Lefebvre et al.	LK17
Scotiaecystis prokopi Lefebvre et al., 2018	Lefebvre et al. (2018), syntyp	LK9
Scotiaecystis prokopi Lefebvre et al., 2018	Lefebvre et al. (2018), syntyp	LK4
Scotiaecystis prokopi Lefebvre et al., 2018	syntyp Lefebvre et al. (2018)	LK13
Scotiaecystis prokopi Lefebvre et al., 2018	Lefebvre et al. (2018), syntyp	LK5
Scotiaecystis prokopi Lefebvre et al., 2018	Lefebvre et al. (2018), syntyp	LK7
Scotiaecystis prokopi Lefebvre et al., 2018	Lefebvre et al. (2018), syntyp	LK8
Scotiaecystis prokopi Lefebvre et al., 2018	Lefebvre et al. (2018), syntyp	LK11
Scotiaecystis prokopi Lefebvre et al., 2018	syntyp Lefebvre et al. (2018)	LK12
Scotiaecystis prokopi Lefebvre et al., 2018	Lefebvre et al. (2018), syntyp	LK10
Scotiaecystis prokopi Lefebvre et al., 2018	Lefebvre et al. (2018), syntyp	LK6
Scotiaecystis prokopi Lefebvre et al., 2018	syntyp Lefebvre et al. (2018)	LK14
Scotiaecystis Caster & Ubaghs in Ubaghs, 1967		BL95
Stylophora Gill et Caster, 1960		MN33
Stylophora Gill et Caster, 1960		MN40
Stylophora Gill et Caster, 1960		MN37
Stylophora Gill et Caster, 1960		MN18
Stylophora Gill et Caster, 1960		KP676
Stylophora Gill et Caster, 1960		MN39

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Img. 85: Morphology of Stylophorans (after Ruta 2003)

Img. 85:

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