HETEROPORIDAE Heteropora alaskensis Heteropora magda MOLLUSCA, POLYPLACOPHORA ISCHNOCHITONIDAE Callistochiton gabbi Ischnochiton acrior Stenoplax magdalenensis Stenoplax sp.
Among bryozoans there are representatives of the Stenolaemata Lichenoporidae, Gymnolaemata Cupuladriidae and numerous erect forms, which are locally very abundant and well-preserved, but not yet studied (Figs.
Bryozoa Ehrenberg, 1831 Stenolaemata Borg, 1926 Lichenoporidae indet.
The oldest class, Stenolaemata
, has only one extant order: the marine calcified Cyclostomatida with characteristic tube-shaped zooids forming colonies that vary from encrusting to branched to massive.
Faunistisch overzicht van de mosdiertjes van Nederland (Bryozoa: Stenolaemata
X Native Hincks, 1880 Bryozoa Stenolaemata
Cyclostomata Crisiidae Crisia X X X Native Johnston, pseudosolena 1838 (Marcus, 1937) Cnidaria Anthozoa Hexacorallia Actiniaria Actiniidae Bunodosoma X X Native Gosse 1858 caissarum Correa in Belem, 1987 Cnidaria Anthozoa Hexacorallia Scleractinia Rhizangiidae Astrangia sp.
Other clades and paraphyletic or diphyletic groups (see Taylor, 2000) of the class Stenolaemata
perished in the mass extinctions that began and ended the Triassic.
The earlier of these events marked the origin of the class Stenolaemata
, of which the Cyclostomata are the only extant order; the later event marked the origin of the order Cheilostomata (of the class Gymnolaemata).