Aquatic Insect

Drain Fly Larvae

Psychodidae family

Horse Fly

Tabanus spp. (genus, as specific species cannot be determined from the image)

Caddisfly Larva

Order Trichoptera

Caddisfly

Trichoptera (Order Level)

Crane Fly

Tipulidae

Dragonfly (specifically a member of the Emerald family)

Somatochlora (genus species varies, often Somatochlora metallica or similar)

Dragonfly Nymph (or Larva)

Various species within the order Odonata, suborder Anisoptera

Caddisfly larva (case-bearing)

Too difficult to determine from the image alone without more specific morphological details, as it’s a larval stage and ...

Fishfly (Male)

Chauliodes pectinicornis

Non-biting midge

Chironomus plumosus

Dragonfly

Odonata (Anisoptera)

Bloodworm (Chironomid Larva)

Chironomidae (larval stage)

Dragonfly

Libellulidae (Skimmers) - likely a species within this family, possibly a widow skimmer (Libellula luctuosa) or similar.

Drain Fly (or Moth Fly, Filter Fly, Sewer Fly)

Psychoda spp. (or Clogmia albipunctata, depending on specific species, but Psychoda is most common for drain flies)

Mosquito

Culicidae

Crane Fly

Tipulidae

Ghost Midge (non-biting midge)

Family Chaoboridae (e.g., Chaoborus sp.)

Drain Fly Larva

Psychodidae family (larval stage)

Caddisfly Larva

Trichoptera larva (general designation as specific species cannot be determined from the image)

Mosquito (presumed bite reaction)

Various species within the Culicidae family (e.g., Anopheles, Aedes, Culex) (presumed bite reaction)

Drain Fly Larva (Moth Fly Larva)

Clogmia albipunctata (Family: Psychodidae)

Hydra

Hydra (a genus, not a single species; common species include H. vulgaris, H. viridissima, H. oligactis)

Non-biting Midge

Chironomidae (family)

Bloodworm (Midge Larva)

Chironomus plumosus (representative species)

Tardigrade (also known as Water Bear or Moss Piglet)

Tardigrada

Non-biting Midge Larva

Chironomidae (family)

Drain Fly

Psychodidae

Nematode (Roundworm)

Nematoda (Phylum)

Drain Fly (larvae)

Psychodidae (larvae)

Damselfly

Zygoptera spp.

Drain Fly (or Moth Fly, Filter Fly)

Psychodidae (family)

Horsehair worm

Nematomorpha

Crane Fly

Tipula species (or other genera within Tipulidae)

Common House Mosquito

Culex pipiens

Inland Floater (Mussel) / Fragmented Glochidia

Pyganodon grandis

Globular Springtail

Sminthurides aquaticus (likely, based on the aquatic context)

Mosquito

Culicidae (family)

Fungus Gnat Larvae, "Drain worms"

Sciaridae or Mycetophilidae (larvae)

Non-biting Midge

Chironomidae

Chironomid eggs

Family Chironomidae

Bloodworm

Chironomidae larvae (various genera and species)

Horse Fly

Tabanus spp.