Metazoa – Obazoa (Opisthokonta)

Observations on Ephydatia fluviatilis

Position in the EOL taxonomic tree. Please click on the tree view below to access EOL (Encyclopedia of Life).

Ephydatia fluviatilis (Linnaeus, 1759)

Most likely ID: n.a.

Basionym: Spongia fluviatilis Linnaeus, 1759

Add’l Synonyms: NM

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Sampling date 05/2011. Scale bar indicates 50 µm (3).

Three images. Tiny sponge grown on a microscope slide.

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Place name: Creek in Oder valley 100 km north east of Berlin (Germany)
Latitude: 53.135032 Longitude: 14.348738

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF image.

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Scale bars indicate 50 µm (1), 25 µm (2, 4–6), 10 µm (3).

Six images. The coverslip print has disintegrated the sponge, making the amoeboid, totipotent cells visible. Totipotent means embryonic in the sense that each of these cells is capable of developing into a new sponge through successive mitotic divisions. Note that each cell has zoochlorellae!

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Place name: Creek in Oder valley 100 km north east of Berlin (Germany)
Latitude: 53.135032 Longitude: 14.348738

Microscope Zeiss Universal, camera Olympus C7070WZ. DOF image.

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Sampling date 03/2021. Scale bars indicate 100 µm (1), 25 µm (2, 3).

Three images.

First:	Gemmula of Ephydatia fluviatilis. Most freshwater sponges produce gemmulae, globular bodies containing totipotent cells protected by a shell of the biopolymer spongin in order to survive unfavorable living conditions.
Second and third:	Close-up of the spongin layer of a gemmula.

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Place name: Historical Eider Canal Rathmannsdorf (Schleswig-Holstein, Germany)
Latitude: 54.38023557 Longitude: 10.07928818

Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF images.

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Three images. The totipotent sponge cells from two gemmulae have built new tiny sponges.

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Place name: Historical Eider Canal Rathmannsdorf (Schleswig-Holstein, Germany)
Latitude: 54.38023557 Longitude: 10.07928818

Microscope Zeiss Axioplan, camera Olympus OM-D M5 MKII. DOF images.

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Three images, two in a slide changer.
The juvenile sponges have formed their first outlets for filtered water, oscula.

Please click on < or > on the image edges or on the dots at the bottom edge of the images to browse through the slides!

Place name: Historical Eider Canal Rathmannsdorf (Schleswig-Holstein, Germany)
Latitude: 54.38023557 Longitude: 10.07928818

Zeiss dissecting microscope SV6, camera Olympus OM-D M5 MKII. DOF images.

© Wolfgang Bettighofer,
images under Creative Commons License V 3.0 (CC BY-NC-SA).
For permission to use of (high resolution) images please contact postmaster@protisten.de.

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Observations on Ephydatia fluviatilis

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