Photo 129170210, (c) Zac Peterson, some rights reserved (CC BY-NC), uploaded by Zac Peterson

Attribution © Zac Peterson some rights reserved Uploaded by zacpeterson Source iNaturalist Associated observations Photos / Sounds 5 photos What Knotted Thread Hydroid (Obelia geniculata) Observer zacpeterson Date May 15, 2021 10:55 AM EDT Place Rockport, MA 01966, USA (Google, OSM) Date Added May 15, 2021 09:30 PM UTC 2 IDs Research Grade View Sizes small medium large original