The mid-Ordovician mitrocystitid mitrate Mitrocystella incipiens was one of the most widespread stylophorans in the high latitude Mediterranean Province, with occurrences in the Armorican Massif (France), the Iberian Peninsula (Portugal and Spain) and the Prague Basin (Czech Republic), all restricted so far to the late Darriwilian (Hustedograptus teretiusculus Zone). The description of this taxon in the Corréjou Member (Postolonnec Formation) of the Crozon Peninsula (western Brittany, France) not only extends its spatial distribution within the Armorican Massif, but also its stratigraphic range into the mid-Darriwilian (Didymograptus artusZone). The remarkable preservation of the new material and associated sedimentological evidence both suggest rapid burial by storm deposits.
Barrande, J. 1887. Système Silurien du centre de la Bohême. 1ère Partie. Recherches Paléontologiques. Classe des Echinodermes. Ordre des Cystidées, Vol. 7 (Silurian System of Central Bohemia. 1st Part. Palaeontological Research. Class Echinodermata. Order Cystidae, Vol. 7). Gerhard, Leipzig; Řivnáč, Prague.
Brett, C. E., Moffat, H. A. and Taylor, W. 1997. Echinoderm taphonomy, taphofacies, and Lagerstätten. In Geobiology of Echinoderms (Waters, J. A. and Maples, C. G., eds). Paleontological Society Papers, 3, 147–190.
https://doi.org/10.1017/S1089332600000243
Chauvel, J. 1937. Les hétérostélées armoricaines (Armorican heterosteleans). Comptes-Rendus de la Société Géologique et Minéralogique de Bretagne, 3, 1–3.
Chauvel, J. 1941. Recherches sur les cystoïdes et les carpoïdes armoricains (Research on Armorican cystoids and carpoids). Mémoires de la Société Géologique et Minéralogique de Bretagne, 5, 1–286.
Chauvel, J. and Meléndez, B. 1978. Les échinodermes (cystoïdes, astérozoaires, homalozoaires) de l’Ordovicien moyen des Monts de Tolède (Espagne) (Echinoderms (cystoids, asterozoans, homalozoans) from the Middle Ordovician of the Toledo Mountains (Spain)). Estudios Geológicos, 34, 75–87.
Couto, H. and Gutiérrez-Marco, J. C. 2000. Alguns fósseis raros ou pouco conhecidos da Formação de Valongo (Ordovícico Médio, Norte de Portugal) (Some rare or little known fossils from the Valongo Formation (Middle Ordovician, Northern Portugal)). In I Congresso Ibérico de Paleontología/16th Jornadas de la Sociedad espanola de Paleontología (1st Iberian Congress of Palaeontology/16th Conference of the Spanish Society of Palaeontology) (Diez, J. B. and Balbino, A. C., eds). Universidade de Evora, Evora, 191–192.
Dabard, M. P., Loi, A. and Paris, F. 2007. Relationship between phosphogenesis and sequence architecture: Sequence stratigraphy and biostratigraphy in the Middle Ordovician of the Armorican Massif (NW France). Palaeogeography, Palaeoclimatology, Palaeoecology, 248(3–4), 339–356.
https://doi.org/10.1016/j.palaeo.2006.12.011
Dabard, M. P., Loi, A., Paris, F., Ghienne, J. F., Pistis, M. and Vidal, M. 2015. Sea-level curve for the Middle to early Late Ordovician in the Armorican Massif (western France): Icehouse third-order glacio-eustatic cycles. Palaeogeography, Palaeoclimatology, Palaeoecology, 436, 96–111.
https://doi.org/10.1016/j.palaeo.2015.06.038
Guillocheau, F. 1983. Les dépôts de tempêtes. Le modèle de l’Ordovicien moyen ouest-armoricain (Storm deposits. The West Armorican Middle Ordovician model). PhD thesis. Brest, France (unpublished).
Gutiérrez-Marco, J. C. and Meléndez, B. 1987. Nuevos hallazgos de Estilóforos (Homalozoos) en los materiales ordovícicos de la zona Centroibérica (New findings of Stylophorans (Homalozoans) in Ordovician materials of the Central Iberian area). Coloquios de Paleontología, 41, 41–50.
Henry, J. L. 1980. Trilobites ordoviciens du Massif armoricain (Ordovician trilobites of the Armorican Massif). Mémoires de la Société Géologique et Minéralogique de Bretagne, 22, 1–250.
Hunter, A. W., Lefebvre, B., Régnault, S., Roussel, P. and Claverie, R. 2007. A mixed ophiuroid-stylophoran assemblage (Echinodermata) from the Middle Ordovician (Llandeilian) of western Brittany, France. Geological Society, London, Special Publications, 275, 71–86.
https://doi.org/10.1144/GSL.SP.2007.275.01.05
Jefferies, R. P. S. 1987. The chordates – a preliminary note. In The Arenig Series in South Wales: Stratigraphy and Palaeontology (Fortey, R. A and Owens, R. M., eds). Bulletin of the British Museum (Natural History), Geology, 41, 285–290.
Kerforne, F. 1901. Etude de la région silurique occidentale de la presqu’île de Crozon (Finistère) (Study of the Western Silurian Region of the Crozon Peninsula (Finistère)). Imprimerie Simon, Rennes.
Kolata D. R., Frest, T. J. and Mapes, R. H. 1991. The youngest carpoid: occurrence, affinities, and life mode of a Pennsylvanian (Morrowan) mitrate from Oklahoma. Journal of Paleontology, 65(5), 844–855.
https://doi.org/10.1017/S0022336000037811
Lefebvre, B. 2000. Les échinodermes stylophores du Massif armoricain (Stylophoran echinoderms of the Armorican Massif). Bulletin de la Société des Sciences Naturelles de l’Ouest de la France, 22, 101–122.
Lefebvre, B. 2003. Functional morphology of stylophoran echinoderms. Palaeontology, 46(3), 511–555.
https://doi.org/10.1111/1475-4983.00309
Lefebvre, B. 2007. Early Palaeozoic palaeobiogeography and palaeoecology of stylophoran echinoderms. Palaeogeography, Palaeoclimatology, Palaeoecology, 245(1–2), 156–199.
https://doi.org/10.1016/j.palaeo.2006.02.021
Lefebvre, B. and Ausich, W. I. 2021 New Siluro-Devonian anomalocystitids (Echinodermata, Stylophora) from Bolivia and Canada, and a reevaluation of skeletal homologies in mitrates. Paleontological Journal, 55(9), 932–965.
https://doi.org/10.1134/S0031030121090070
Lefebvre, B. and Fatka, O. 2003. Palaeogeographical and palaeoecological aspects of the Cambro-Ordovician radiation of echinoderms in Gondwanan Africa and peri-Gondwanan Europe. Palaeogeography, Palaeoclimatology, Palaeoecology, 195(1–2), 73–97.
https://doi.org/10.1016/S0031-0182(03)00303-1
Lefebvre, B., Nohejlová, M., Martin, E. L. O., Kašička L., Zicha O. and Gutiérrez-Marco J. C. 2022. New Middle and Late Ordovician cornute stylophorans (Echinodermata) from Morocco and other peri-Gondwanan areas. Geological Society, London, Special Publications, 485, 345–522.
https://doi.org/10.1144/SP485-2021-99
Loi, A. and Dabard, M. P. 2002. Controls of sea level fluctuations on the formation of Ordovician siliceous nodules in terrigenous offshore environments. Sedimentary Geology, 153(3), 65–84.
https://doi.org/10.1016/S0037-0738(02)00102-1
Parsley, R. L. and Gutiérrez-Marco, J. C. 2005. Stylophorans in middle Arenig shallow water siliciclastics: Vizcainocarpus from the Imfout syncline in Morocco’s western Meseta. Bulletin of Geosciences, 80(3), 185–192.
Prokop, R. J. and Petr, V. 1999. Echinoderms in the Bohemian Ordovician. Journal of the Czech Geological Society, 44(1–2), 63–68.
de Tromelin, G. and Lebesconte, P. 1876. Essai d’un catalogue raisonné des fossiles siluriens des départements de Maine-et-Loire, de la Loire-Inférieure et du Morbihan, avec des observations sur les terrains paléozoïques de l’Ouest de la France (Essay of a reasoned catalogue of the Silurian fossils of the departments of Maine-et-Loire, Loire-Inférieure and Morbihan, with observations on the Palaeozoic terrains of western France). Association française pour l’Avancement des Sciences. Compte rendu de la 4ème session, Nantes, 1875, 601–659.
Vidal, M., Dabard, M. P., Gourvennec, R., Le Hérissé, A., Loi, A., Paris, F. et al. 2011. Le Paléozoïque de la presqu’île de Crozon, Massif armoricain (France) (The Palaeozoic of the Crozon Peninsula, Armorican Massif (France)). Géologie de la France, 1, 3–45.
Zamora, S., Lefebvre, B., Álvaro, J. J., Clausen, S., Elicki, O., Fatka, O. et al. 2013. Cambrian echinoderm diversity and palaeobiogeography. In Early Palaeozoic Biogeography and Palaeogeography (Harper, D. A. T. and Servais, T., eds). Geological Society, London, Memoirs, 38, 157–171.
https://doi.org/10.1144/M38.13