Synthecium_evansi

Sythecium evansi is a medium sized symmetrically branched (cf with the asymmetrical Aglaophenia sp.) colonial hydroid. It was collected on the rhizomes of Posidonia oceanica. An interesting feature of this hydroid (but not exclusive to it) is the community of epibionthic diatoms living inside the thecae of the hydroid colony. This species is found in the Mediterranean Sea as well as the Canary Islands.

This specimen was identified and described in detail (p. 187 & Fig. 4g) in the following paper published (2013) by Soto Àngel and Peña Cantero.