Figure 9. Unionoida parasitic larval types. A in Palaeoheterodont diversity (Mollusca: Trigonioida + Unionoida): what we know and what we wish we knew about freshwater mussel evolution

Figure 9. Unionoida parasitic larval types. A, Hooked-type glochidium of Alasmidonta marginata (Unioninae). B, Hookedtype glochidium of Triplodon corrugatus (Lamarck, 1819) (Hyriidae). C, Unhooked-type glochidium of Villosa iris (Lampsilini). D, Axe-head-type glochidium of Potamilus alatus (Say, 1817) (Lampsilini). E, Lasidium of Monocondylaea paraguayana (d'Orbigny, 1835) (Mycetopodidae). F, Haustorium-type lasidium of Mutela bourguignati (Bourguignat, 1885) (Iridinidae). A, C, D, redrawn from Baker (1928); B, E, redrawn from Bonetto & Ezcurra (1963); F, re-drawn from Fryer (1961).