Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A global community of nature enthusiasts
photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

Freshwater Seed Shrimp


Commonly called seed shrimps these Crustaceans were about 1 mm in length. They had smooth hinged calcitic bivalves and occasionally I could see some feathery appendages extend outside the shells (Pic 2 & 3). They were in large numbers swimming and possibly feeding amongst pond weeds.


Small frog ponds in a native bush reserve - Glenfern Valley Bushland


Because the hard calcite shells cover most of the soft parts of the body, they have to open to allow appendages to assist with feeding, swimming and mating. Oxygen is absorbed directly through the cuticle of the body. These Ostracods had smooth carapace (shells) but there are other species with setae, pits, striations and ridges.
Ostracods feed on a variety of organic material including algal debris and larvae of other crustaceans.
Some species are bioluminescent producing a bluish light and have been used in scoops by Japanesee during the war to assist with map-reading in the dark.
They are fascinating little crustaceans and are amusing to watch ! I would have loved a microscopic view of these and to present better pics but this will have to do.
Here's some interesting information about them.
I am not sure of the scientific classification except that they are classed so: Phylum: Arthropoda
Subphylum: Crustacea
Superclass: Oligostraca
Class: Ostracoda

Species ID Suggestions

Sign in to suggest organism ID


Leuba Ridgway
Leuba Ridgway 3 years ago

Actually Tukup my husband Mark pointed these out to me. I walked straight past the pond. They are quite visible if you stop and have a good close look. I've always liked these little crustaceans so this was a lucky find.

Tukup 3 years ago

Only 1 mm long?? They would need to jump up and down and holler loud for me to even notice them. Great catch Leuba. Thanks for sharing.

Mark Ridgway
Mark Ridgway 3 years ago

Time to fire up the barbie.

Mark Ridgway
Mark Ridgway 3 years ago

My goodness how did you see those.

Leuba Ridgway
Spotted by
Leuba Ridgway

Victoria, Australia

Spotted on Jul 22, 2019
Submitted on Jul 23, 2019

Related Spottings


Nearby Spottings

Acacia Horned Treehopper Eucalyptus Leaf Galls Paropsine Leaf Beetle Rice Stink Bug
Noah Guardians
Noah Sponsors
join Project Noah Team

Join the Project Noah Team