Microlife: Fish Creek Park - Rhizoclonium from pond

Jul 26-28, 2008

This was from a pool near Fish Creek, with clear water but many large clumps of algae floating or growing on the bottom. The sample was one of the floating mats, a sticky tangled mass of Rhizoclonium with a few duckweeds. A number of arthropods were also present – water fleas, copepods, amphipods, and midge larvae – as well as a few pond snails.

Marsh

The most activity was around the duckweed, with abundant flatworms of varying size and Paramecium, both green. There were also groups of small prostomes, and various sessilids, among others. Paramecium and prostomes also occurred throughout the sample, along with Halteria, Frontonia, Lepadella, and bdelloids.

Besides these there were scattered Cothurnia, diatoms, and small oval ciliates on the algae, and ostracods, Anthophysa, and filamentous cyanobacteria near the bottom. In each of these sections there were also many other kinds that were only noticed once or twice.

Kingdom Bacteria
…Phylum Cyanobacteria – blue-green algae

Oscillatoriales
Oscillatoriales - about 16 µm wide

Kingdom Plantae
…Phylum Chlorophyta – green algae

Rhizoclonium
Rhizoclonium - about 25 µm wide
Zygnema
Zygnema - about 35 µm wide
Closterium
Closterium - about 260 µm
Cosmarium
Cosmarium - about 65 µm

Kingdom Chromista
…Phylum Ciliophora – ciliates

Euplotes
Euplotes - about 50 µm
Stichotricha
Stichotricha - about 120 µm
Pleurostomatid
Pleurostomatida - about 65 µm
Lacrymaria
Lacrymaria - about 155 µm
Prostomes
Prostomatea - about 35 µm
Frontonia
Frontonia - about 90 µm
Paramecium
Paramecium - about 100, 75 µm
Oligohymenophore
Oligohymenophorea - about 75 µm
Rhabdostyla
Rhabdostyla - projecting up to 50 µm
Cothurnia
Cothurnia - about 65 µm
Vaginicolid
Vaginicolidae - about 190 µm
Vorticellid
Vorticellidae - body about 55 µm

…Phylum Ochrophyta – heterokont algae

Anthophysa
Anthophysa - clusters about 20-25 µm
Diatoms
Diatomeae - about 25 wide, 135, 130, 50 µm
Diatoms
Diatomeae - up to 75 µm
Diatoms
Diatomeae - about 140 µm
Diatom
Diatomeae - about 110 µm
Rhopalodia
Rhopalodia - about 160 µm

Kingdom Protozoa
…Phylum Euglenozoa

Peranema
Peranema - about 50 µm
Euglenid
Euglenida - about 40 µm

…Phylum Amoebozoa

Discosea?
Discosea? - about 35 µm
Tubulinea
Tubulinea - about 60 µm
Arcella
Arcella - shell about 120 µm

Kingdom Animalia
…Phylum Cnidaria

Hydra
Hydra - neck about 125 µm wide

…Phylum Gnathifera – rotifers & allies

Bdelloid
Bdelloida - body about 130 µm
Bdelloid
Bdelloida - about 245 µm
Colurella
Colurella - body about 80 µm
Lepadella
Lepadella - body about 100 µm
Ploima
Ploima - body about 90 µm

…Phylum Gastrotricha

Chaetonotid
Chaetonotidae - about 90 µm

…Phylum Platyhelminthes – flatworms

Typhloplanids
Typhloplanidae - about 350, 165 µm

…Phylum Arthropoda – insects, crustaceans & allies

Podocopid
Podocopida - about 275 µm
Podocopid
Podocopida - about 420 µm
Podocopid
Podocopida - about 710 µm
Copepod larva
Copepoda, larva - body about 175 µm
Chydorid
Chydoridae - about 240 µm

Uncertain objects

Unknown
Gently turning - about 45 µm
Unknown
Non-motile - dark spheres up to 45 µm
Unknown
Stationary but later rounding out - about 70 µm
Unknown
More or less turning in place - about 120 µm
Unknown
Slowly turning with fine cilia - about 165 µm