Ericthonius didymus - Pacifische klauwvlokreeft

Ericthonius didymus  Krapp-Schickel, 2013

Pacifische klauwvlokreeft

Oranjemolen, the Netherlands, 23-3-2026. In vitro photo specimen A, diameter head 0.35 mm, 25-3-2026.

Oranjemolen, the Netherlands, 23-3-2026. In vitro photo specimen A, 25-3-2026.

Oranjemolen, the Netherlands, 23-3-2026. In vitro photo specimen A, 25-3-2026.

Oranjemolen, the Netherlands, 23-3-2026. In vitro photo specimen A, 25-3-2026.

Zeelandbrug, the Netherlands, 5-8-2024. With Hippolyte varians (Chamaeleon prawn - Veranderlijke steurgarnaal).

Zeelandbrug, the Netherlands, 18-7-2024. With Halichondria panicea (Breadcumb sponge - Broodspons).

Zeelandbrug - West, the Netherlands, 22-9-2022.

Halichondria panicea or Halichondria bowerbanki

Halichondria (Halichondria) panicea  (Pallas, 1766) 

Breadcumb sponge - Broodspons

or

Halichondria (Halichondria) bowerbanki  (Burton, 1930) 

Bowerbank's halichondria - Sliertige broodspons

In a recent publication (see at the bottom of the page) the authors state that the taxa of Halichondria panicea and H. bowerbanki are not diagnosable with traditional morphological characters. That implies that you have to do DNA-research to be 100% sure about the identity of the species. The identification of the specimens shown at this page is merely a guess based on their habitus.

PART 1: More likely Halichondria (Halichondria) panicea

Sint-Annaland, the Netherlands, 19-3-2019.

Sint-Annaland, the Netherlands, 8-12-2015. Specimen A.

Sint-Annaland, the Netherlands, 8-12-2015. Specimen A.

PART 2: More likely Halichondria (Halichondria) bowerbanki

Watervalletje, the Netherlands, 3-11-2015.

Sint-Annaland, the Netherlands, 1-3-2017. Specimen B.

Sint-Annaland, the Netherlands, 1-3-2017. Specimen B.

Sint-Annaland, the Netherlands, 1-3-2017. Specimen B.

Zeelandbrug, the Netherlands, 17-09-2012.

Sint-Annaland, the Netherlands, 3-4-2018.

Watervalletje, the Netherlands, 3-11-2015. Specimen C.

Watervalletje, the Netherlands, 3-11-2015. Specimen C.

A common garden of Halichondria sponges: taxonomic revision of Northeast

Pacific Halichondriidae reveals many cryptic introduced species. Thomas Turner, Christine Morrow, Bernard Picton, Claire Goodwin, Robert Thacker, 2024-11. BioRxiv 2024, 11. 

https://doi.org/10.1101/2024.11.04.621922

Halichondria panicea - Breadcumb sponge - Broodspons

Halichondria (Halichondria) panicea  (Pallas, 1766) *

Breadcumb sponge - Broodspons

Neeltje Jans - Getijdenpoel, the Netherlands, 17-12-2011. Specimens A.

Neeltje Jans - Getijdenpoel, the Netherlands, 17-12-2011. Specimens A.

Neeltje Jans - Getijdenpoel, the Netherlands, 17-12-2011. Specimens A.

Zeelandbrug, the Netherlands, 2-1-2017.

Wemeldinge - haven, the Netherlands, 13-8-2022.

Neeltje Jans - Getijdenpoel, the Netherlands, 1-12-2018. Yellow and greenish specimens. Orange specimen not identified.

Zeelandbrug, the Netherlands, 17-10-2018.

Watervalletje, the Netherlands, 9-10-2017.

Zeelandbrug, the Netherlands, 18-11-2019.

Zeelandbrug, the Netherlands, 24-6-2016.

Wolphaartsdijk - Zuidvlietpolderweg, the Netherlands, 15-10-2019.***

Springersdiep, the Netherlands, 11-8-2022.

Dreischor - A. de Oude'sweg, the Netherlands, 17-9-2017.

Wemeldinge - haven, the Netherlands, 13-8-2022.

Slikken van Viane, the Netherlands, 1-9-2018.

Gorishoek, the Netherlands, 22-1-2011.

Zeelandbrug, the Netherlands, 19-7-2016.

Wemeldinge - haven, the Netherlands, 12-8-2017.***

Dreischor - A. de Oude'sweg, the Netherlands, 17-9-2017.

Slikken van Flakkee, the Netherlands, 28-8-2024.

Slikken van Flakkee, the Netherlands, 28-8-2024.

Wolphaartsdijk -  Zuidvlietpolderweg, the Netherlands, 15-10-2019.**

Wolphaartsdijk -  Zuidvlietpolderweg, the Netherlands, 15-10-2019.

Slikken van Flakkee, the Netherlands, 28-8-2024.

Goese Sas, the Netherlands, 21-10-2017.

Stavenisse - Veerweg, the Netherlands, 27-11-2013.

Zeelandbrug, the Netherlands, 19-7-2016.

Sint-Annaland, the Netherlands, 12-8-2014.

Zeelandbrug, the Netherlands, 25-3-2025. Specimen B.****

Zeelandbrug, the Netherlands, 25-3-2025. Specimen B.****

Zeelandbrug, the Netherlands, 25-3-2025. Specimen B.****

Zeelandbrug, the Netherlands, 25-3-2025. Specimen C.****

Zeelandbrug, the Netherlands, 25-3-2025. Specimen C.****

* In a recent publication (see below) the authors state that the taxa of Halichondria panicea and H. bowerbanki are not diagnosable with traditional morphological characters. That implies that you have to do DNA-research to be 100% sure about the identity of the species.

 

A common garden of Halichondria sponges: taxonomic revision of Northeast

Pacific Halichondriidae reveals many cryptic introduced species. Thomas Turner, Christine Morrow, Bernard Picton, Claire Goodwin, Robert Thacker, 2024-11. BioRxiv 2024, 11. 

https://doi.org/10.1101/2024.11.04.621922

** Identification confirmed by Rob van Soest (18-11-2019).

*** Identification confirmed by studying its spicules by Mikkel Suijker.

**** Identification confirmed by studying its spicules by Mikkel Suijker (5-4-2025).