Brooding in Corbicula madagascariensis (Bivalvia, Corbiculidae)

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Brooding in Corbiculidae • M. Glaubrecht et al.Fig. 1 A–D. Brooding in Corbicula madagascariensis. Topotypical specimen of ‘C. sikorae’ (ZMB Moll. 45.446); see text for details. —A. Rightvalve with a clump of juveniles surrounded by the mummified body. —B. Left valve of the same specimen. —C. Clump of juveniles.—D. Dislodged juveniles. Scale bars, 2 mm.lineages, with the other two found in C. madagascariensis andC. linduensis; see Discussion for details.DiscussionWhile most marine bivalves are oviparous, some exceptionsto this are found, for example in Ostreidae, Carditidae,Galeommatidae and Teredinidae, which incubate larvae in orbetween the gill filaments (e.g. Mackie 1984; Ponder 1998).On the other hand, the various reproductive morphologiesand strategies found in limnic bivalves have aroused muchinterest recently, in particular the Unionoidea, (whichadditionally have different parasitic larval stages; Mackie 1984;Graf & Ó Foighil 2000; Schwartz & Dimock 2001), and alsothe Sphaeriidae (Mansur & Meier-Brook 2000; Cooley &Ó Foighil 2000; Korniushin & Glaubrecht 2002). A particularpoint of interest has been the specialized incubatorystructure, termed brood pouch or marsupium, which in somelimnic bivalves may also have a nutritive function (i.e. matrotrophy);see, e.g. Tankersley & Dimock (1992), Hetzel(1993), Mansur & Meier-Brook (2000), Cooley & Ó Foighil(2000), Graf & Ó Foighil (2000), Hoeh et al. (2001) andKorniushin & Glaubrecht (2003).Viviparous strategies in these bivalves have been related tothe colonization of, and speciation in, freshwater habitats646 Zoologica Scripta, 35, 6, November 2006, pp641–654 • © 2006 The Authors. Journal compilation © 2006 The Norwegian Academy of Science and Letters
M. Glaubrecht et al. • Brooding in CorbiculidaeFig. 2 Phylogenetic relationships among Corbiculidae, based on mtDNA (COI); maximum likelihood phylogram. The numbers on branchesare, from top, maximum likelihood (RELL) and maximum parsimony bootstrap values, and Bayesian inference posterior probabilities; the scalebar indicates the number of substitutions per site. Symbols indicate reproductive modes: bar, basal ovipary; triangle, derived ovipary; circle,ovovivipary; square, euvivipary.© 2006 The Authors. Journal compilation © 2006 The Norwegian Academy of Science and Letters • Zoologica Scripta, 35, 6, November 2006, pp641–654 647
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Brooding in Corbicula madagascariensis (Bivalvia, Corbiculidae)

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