A new genus and species of Apseudomorpha (Crustacea: Tanaidacea) from the Mar del Plata submarine Canyon, South West Atlantic, and replacement of the preoccupied name Hoplomachus Guţu 2002

A new apseudomorph tanaidacean, Deidamiapseudes poseidon n. gen., n. sp., is fully described and illustrated based on many specimens collected in the Mar del Plata Submarine Canyon, South West Atlantic, at 1144 m depth. The new genus Deidamiapseudes is closely related to the genus Hoplomachus Guţu, 2002, from which it can be distinguished by the lack of ommatidia, and by having antennule accessory flagellum of three articles, antenna with small scale, and pleopods with a few setae. In addition, Deidamiapseudes poseidon n. gen., n. sp. was found in deep-sea waters, whereas Hoplomachus is a shallow water genus. The uncertain family position of these two genera is discussed. The name Hoplomachus Guţu, 2002, preoccupied by Hoplomachus Fieber, 1858, is replaced with the name Hoplopolemius.Fil: Sganga, Daniela Eliana. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; ArgentinaFil: Roccatagliata, Daniel Carlos. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biología Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biología Experimental y Aplicada; Argentin

Electrophysiological features of telocytes

Telocytes (TCs) are interstitial cells described in multiple structures, including the gastrointestinal tract, respiratory tract, urinary tract, uterus, and heart. Several studies have indicated the possibility that TCs are involved in the pacemaker potential in these organs. It is supposed that TCs are interacting with the neighboring muscular cells and their network contributes to the initiation and propagation of the electrical potentials. In order to understand the contribution of TCs to various excitability mechanisms, it is necessary to analyze the plasma membrane proteins (e.g., ion channels) functionally expressed in these cells. So far, potassium, calcium, and chloride currents, but not sodium currents, have been described in TCs in primary cell culture from different tissues. Moreover, TCs have been described as sensors for mechanical stimuli (e.g., contraction, extension, etc.). In conclusion, TCs might play an essential role in gastrointestinal peristalsis, in respiration, in pregnant uterus contraction, or in miction, but further highlighting studies are necessary to understand the molecular mechanisms and the cell-cell interactions by which TCs contribute to the tissue excitability and pacemaker potentials initiation/propagation