{"refrec":{"BRefID":27138,"RR":"<b>Healy, J.M.</b> (1996). Spermatozoan ultrastructure in the trigonioid bivalve <i>Neotrigonia margaritacea</i> Lamarck (Mollusca): comparison with other bivalves, especially Trigonioida and Unionoida. <i>Helgol. Meeresunters. 50(2)</i>: 259-264. <a href=\"https://hdl.handle.net/10.1007/BF02367155\" target=\"_blank\">https://hdl.handle.net/10.1007/BF02367155</a>","BEntID":27138,"PublicFlag":1,"CheckedFlag":0,"wosflag":0,"vabbflag":0,"RefStringPartII":". <i>Helgol. Meeresunters. 50(2)</i>: 259-264. <a href=\"https://hdl.handle.net/10.1007/BF02367155\" target=\"_blank\">https://hdl.handle.net/10.1007/BF02367155</a>","DocTypID":8,"DocType":"Journal article","MarineFlag":1,"FreshFlag":0,"BrackishFlag":0,"TerrestrialFlag":0,"Authorstring":"Healy, J.M.","OrigTitleTranslFlag":0,"Authorstringtrunc":"Healy, J.M.","Englishabstract":"Spermatozoa of the trigonioid bivalve <i>Neotrigonia margaritacea</i> (Lamarck) (Trigoniidae, Trigonioida) are examined ultrastructurally. A cluster of discoidal, proacrosomal vesicles (between 9 to 15 in number) constitutes the acrosomal complex at the nuclear apex. The nucleus is short (2.4-2.6 µm long, maximum diameter 2.2 µm), blunt-conical in shape, and exhibits irregular lacunae within its contents. Five or sometimes four round mitochondria are impressed into shallow depressions in the base of the nucleus as is a discrete centriolar fossa. The mitochondria surround two orthogonally arranged centrioles to form, collectively, the midpiece region. The distal centriole; anchored by nine satellite fibres to the plasma membrane, acts as a basal body to the sperm flagellum. The presence of numerous proacrosomal vesicles instead of a single, conical acrosomal vesicle sets <i>Neotrigonia</i> (and the Trigonioida) apart from other bivalves, with the exception of the Unionoida which are also known to exhibit this multivesicular condition. Spermatozoa of <i>N. margaritacea</i> are very similar to those of the related species <i>Neotrigonia bednalli</i> (Verco) with the exception that the proacrosomal vesicles of <i>N. margaritacea</i> are noticeably larger than those of <i>N. bednalli</i>.","AbstractOtherLang":null,"BibLvlCode":"AS","StandardTitle":"Spermatozoan ultrastructure in the trigonioid bivalve <i>Neotrigonia margaritacea</i> Lamarck (Mollusca): comparison with other bivalves, especially Trigonioida and Unionoida","OrigTitleLangCode":"en","OrigTitleLangCodeExtended":"eng","OrigTitleLangID":15,"DateLastModified":{"date":"2026-06-05 01:30:42.859605","timezone_type":1,"timezone":"+02:00"},"UserAccessRight":null,"UserAccID":null,"AuthorKeywords":null,"OtherDescriptors":null,"Notes":null,"AnaPub":1996,"MonPub":null,"DateUpdate":"2021-06-01","DateCreate":"2002-09-16","SecASFANote":null,"ConfID":null,"PeerRev":1,"VlizCoreFlag":1,"WoScode":null,"VABBcode":null,"OpenAcc":0,"Handle":"10.1007/BF02367155"},"refs":null,"anarec":{"AnaID":27138,"PubliDate":1996,"Pagination":"259-264","XtraPublOfAnaID":null,"ISBN":null,"Volume":"50","Issue":"2","BRefMon":null,"BRefMonRR":null,"BRefXtra":null,"BRefXtraRR":null,"SerBRefID":43116,"SerRR":"Helgoländer Meeresuntersuchungen. 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