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. 2014 Feb 25;9(2):e90033. doi: 10.1371/journal.pone.0090033

Figure 4. SEM views of the mantle margin of Neotrigonia margaritacea and its associated tentacles.

Figure 4

A. Mantle around the exhalant siphon. B. Mantle around the inhalant siphon. C, D. Ventral mantle margin. The periostracum can be seen emerging behind the middle mantle fold in C, whereas it is absent in D, thus leaving the internal surface of the outer mantle fold and the periostracal groove exposed. IMF, inner mantle fold; MMF, middle mantle fold; OMF, outer mantle fold; PG, periostracal groove; Po, periostracum; Tl, tentacle.