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Fig. 4 | BMC Evolutionary Biology

Fig. 4

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

Fig. 4

Earliest ontogeny characters on both ventral and dorsal valves of Eohadrotreta? zhujiahensis from South China. a, e conjunct valves; (a) lateral dorsal view, showing the protegulum and two pairs of lobes on metamorphic shell; (e) lateral view. b, g protegulum and two pairs of lobes on metamorphic shell of a larger conjunct valves; (b) dorsal view; (g) ventral view. c protegulum and a pair of lobes on metamorphic shell of ventral valve. d, f conjunct valves; (d) ventral view, showing protegulum, median sulcus and paired lobes on metamorphic shell; (f) lateral view, noting the pronounced slop on the anterior margin of metamorphic shell. Abbreviations: al, anterior lobe; all, anterolateral lobe; c, shallow cleft; f, pedicle foramen; ff, fine fold; ha, halo; ll, lateral lobe; np, nick points; pmm, posteromedian mound; sp., slope; su, median sulcus. Scale bars: 50 μm

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