There was an error published in Biology Open6, 732-740; doi: 10.1242/bio.024588

These errors are detailed below and the original article has been changed correspondingly.

The name of the co-author, Georges Hoellerich, was spelt incorrectly and has been changed to Georges Hollerich.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution and reproduction in any medium provided that the original work is properly attributed.