Ross worm tubes?

Ross worm tubes?

Observation - Ross worm tubes? - UK and Ireland. Description: Small c5mm diameter tubes of sand emerging from crevice in limestone rock bored by a sponge Cliona celata exposed on a very low tide in Wales. The head of a worm is visible in the right hand tube in pic1. Quite similar to S. alveolata, the honeycomb worm

Small c5mm diameter tubes of sand emerging from crevice in limestone rock bored by a sponge Cliona celata exposed on a very low tide in Wales. The head of a worm is visible in the right hand tube in pic1. Quite similar to S. alveolata, the honeycomb worm, but tubes are maybe a bit smaller and not aggregated in a reef in this location,