Fig. 1

Systematics of Tectipleura, their habitats and hemocyanin gene structures. a Tectipleura comprise the two large groups Euopisthobranchia and Panpulmonata. The systematics of both groups are shown as derived in molecular analysis by Jörger et al. [7], Schrödel [8] and Kano et al. [9]. Tectipleura included in this study are shown on the right site of the lineage they belong to (highlighted in bold). Habitats are represented by colored circles on the right. While all Euopisthobranchia are marine (dark blue), Panpulmonata also include intertidal (light blue), limnic (green) and terrestrial (brown) gastropods. b The number of internal introns and of functional units (right) of yet analyzed cephalopod and gastropod hemocyanin genes. For the distribution within functional units see Additional file 1. Species and the rough systematics of the major groups they belong to are shown on the left side. Hemocyanin-like proteins of Biomphalaria glabrata are included in this figure, as well