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Fig. 8 | BMC Evolutionary Biology

Fig. 8

From: Earliest ontogeny of early Cambrian acrotretoid brachiopods — first evidence for metamorphosis and its implications

Fig. 8

Life cycles, including earliest ontogenetic development stages, in different lingulate brachiopods. a extant lingula, showing life cycle of secondary larva. b extant Discinisca, showing life cycle of secondary larva. c early Cambrian Eoobolus, showing life cycle of primary larva with the completion of metamorphosis after settlement. d early Cambrian Eohadrotreta, showing life cycle of primary larva with the completion of metamorphosis after settlement (modified from [12, 15, 20, 26, 29, 45]). Abbreviations: bs, brephic shell; lse, larval setae; mas, mature shell; mse, marginal mantle setae; ns, neanic shell; pr, protegulum; te, tentacle

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