caa a22 4500 463255151 CHVBK 20180405153352.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s00435-007-0034-4 doi (NATIONALLICENCE)springer-10.1007/s00435-007-0034-4 Structural and ultrastructural analysis of the gills in the bacterial-bearing species Thyasira falklandica (Bivalvia, Mollusca) [Elektronische Daten] [Flávio Passos, Georgeana de Lima Curi Meserani, Olivier Gros] In this study, the cellular organization of the gill that harbors symbiotic bacteria is described in the thyasirid Thyasira falklandica collected from South Shetlands in Antarctic. Sections of the gills revealed that T. falklandica belongs to the gill type 3, as described by Dufour (Biol Bull, 208:200-212, 2005), with an elongated lateral zone along the frontal-abfrontal axis of the gill filaments. The ciliated and intermediary zones looked similar to those described in symbionts-bearing bivalves. The lateral zone is more complex in T. falklandica than in other Thyasiridae already described. Such a zone is composed of four different cell types. Bacteriocytes are abundant in the frontal and abfrontal positions, while the middle part of the lateral zone is occupied mostly by numerous granule cells devoid of bacteria. All along the lateral zone, TEM and SEM observations show some ciliated cells, which are regularly interspersed between bacteriocytes and/or granule cells. Such cells, according to the long double ciliary roots of their cilia, should have a sensory function. Intercalary cells, which have never been observed between bacteriocytes, are restricted to the middle part of the lateral zone where their expansions overlap the adjacent granule cells. Bacterial symbionts occur only extracellularly among long microvilli differentiated by the bacteriocytes. They are abundant, usually spherical in shape (around 0.7μm length), and covered by the glycocalix from bacteriocyte microvilli. According to TEM views, the empty vesicles located in the periplasmic space should be sulfur storage, as known for other sulfur-oxidizing symbionts. Springer-Verlag, 2007 Bivalvia nationallicence Thyasiridae nationallicence Symbiosis nationallicence TEM nationallicence SEM nationallicence Passos Flávio Departamento de Zoologia, Instituto de Biociências, Universidade de Sao Paulo, Caixa Postal 11461, CEP 05422-970, São Paulo, SP, Brasil aut de Lima Curi Meserani Georgeana Departamento de Zoologia, Instituto de Biociências, Universidade de Sao Paulo, Caixa Postal 11461, CEP 05422-970, São Paulo, SP, Brasil aut Gros Olivier UMR 7138 Systématique-Adaptation-Evolution, équipe Symbiose, UFR des Sciences Exactes et Naturelles, Laboratoire de Biologie marine, B.P. 592, 97159 Pointe-à-Pitre Cedex, Guadeloupe, France aut Zoomorphology Springer-Verlag 126/3(2007-10-01), 153-162 0720-213X 126:3<153 2007 126 435 https://doi.org/10.1007/s00435-007-0034-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00435-007-0034-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Passos Flávio Departamento de Zoologia, Instituto de Biociências, Universidade de Sao Paulo, Caixa Postal 11461, CEP 05422-970, São Paulo, SP, Brasil aut NATIONALLICENCE 700 1- de Lima Curi Meserani Georgeana Departamento de Zoologia, Instituto de Biociências, Universidade de Sao Paulo, Caixa Postal 11461, CEP 05422-970, São Paulo, SP, Brasil aut NATIONALLICENCE 700 1- Gros Olivier UMR 7138 Systématique-Adaptation-Evolution, équipe Symbiose, UFR des Sciences Exactes et Naturelles, Laboratoire de Biologie marine, B.P. 592, 97159 Pointe-à-Pitre Cedex, Guadeloupe, France aut NATIONALLICENCE 773 0- Zoomorphology Springer-Verlag 126/3(2007-10-01), 153-162 0720-213X 126:3<153 2007 126 435 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer