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Fig. 9 | BMC Evolutionary Biology

Fig. 9

From: Unexpected co-linearity of Hox gene expression in an aculiferan mollusk

Fig. 9

Comparison of Hox gene expression patterns in annelid (a), polyplacophoran (b) and gastropod (c) larvae. Antero-posterior Hox gene expression gradient in the larval body is indicated by colored vertical bars (Hox1-5, Hox7 and Post2) on the left side of each trochophore larva. The comparison reveals a relatively similar co-linear Hox gene expression pattern in Annelida and Polyplacophora, whereas in gastropods Hox gene transcripts are expressed non-co-linearly and are often confined to specific morphological features such as the prototroch or the shell field. Annelid data based on Nereis virens and Platynereis dumerilii [17] and gastropod data based on Gibbula varia [33, 34]. Black small circle illustrates the mouth opening, horizontal band the prototroch and ellipse the ventral foot

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