title: Sensory structures of Archaeostraca (Phyllocaridida, Crustacea).
abstract: The carapace of some Archaeostraca exhibits two kinds of structures that are best interpreted as corresponding to sensory organs. Dorsal ones are located either along the dorsal margin of the valves of the carapace, or on the median dorsal plate. Anterolateral ones are located in the anterior region of both valves. Both structures are respectively homologous of the anterior and posterior sensory organs known from extant Leptostraca and other Crustacea. These structures are described in adult Archaeostraca from the Ordovician to the Carboniferous. It is expected that they could have baroreceptor, mechanoreceptor, and/or chemoreceptor functions in some cases, and a function in osmotic regulation in others.
authors.affiliation: CNRS-UMR Paléobiodiversité et Paléoenvironnements, Laboratoire de Micropaléontologie, Université Pierre et Marie Curie, Paris, France.
authors.forename: Sylvie
authors.initials: S
authors.lastname: Crasquin
authors.forename: Patrick R
authors.initials: PR
authors.lastname: Racheboeuf
authors.forename: Jan
authors.initials: J
authors.lastname: Bergström
mesh_terms: D000818:Animals; D019521:Body Patterning; D003445:Crustacea / Q000378:metabolism / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental; D008465:Mechanoreceptors; D008953:Models, Anatomic; D008954:Models, Biological; D009420:Nervous System; D009995:Osmosis; D011984:Sensory Receptor Cells / Q000502:physiology; D009626:Terminology as Topic