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Home and Garden IPM from Cooperative Extension

Photo Gallery: Aquatic Critters (Found In or Near Water)

: Black Flies (their larvae are aquatic)

: Giant Casemaker Caddisfly (Oligostomis ocelligera) (Orono, ME; 5/19/2022) (Photo credit: courtesy of Edward S. Grew)

: Example of a Damselfly (Suborder Zygoptera)

: Deer Fly (their larvae are aquatic)

: Deer Flies (additional examples)

: Dobsonfly larva
(also called a Hellgrammite)

: Dobsonflies (their larvae are aquatic)

: A male dobsonfly; Orono, ME (07/17/2018)

: Ventral view of the specimen shown at left

: Male dobsonfly

: Female dobsonfly

: Dragonflies (the nymphs are aquatic)

: Autumn Meadowhawk (dragonfly) (Sympetrum vicinum)

: Fawn Darner (dragonfly) (Boyeria vinosa) (Etna, ME; 5/19/2022)

: Twelve-spotted Skimmer (dragonfly) (Libellula pulchella) at Coastal Maine Botanical Gardens (Boothbay, ME; 7/3/2012)

: Drain Fly / Bathroom Moth Fly (Clogmia albipunctata) (found around sewage or other wet areas)

: Fishfly adult (their larvae are aquatic) (Subfamily Chauliodinae)

: Fishfly adult (July 16th, 2016; central Maine)

: Fishfly adult (July 16th, 2016; central Maine)

: Fishfly adult

: Giant Water Bug (“Toe-biter”) (Lethocerus americanus)

: Giant Water Bug (“Toe-biter”)

: Giant Water Bug (“Toe-biter”)

: Giant Water Bug (“Toe-biter”)

: Giant Water Bug (“Toe-biter”)

: Horse Fly (Subfamily Tabaninae)

: Horse Fly

: Mayflies (the immatures are aquatic) (Order Ephemeroptera)

: Mayfly

: Mayfly

: Mosquito larvae

: Mosquito Larvae

: Mosquito

: Mosquito

: Mosquito (Ochlerotatus canadensis)

: Predaceous Diving Beetle (Family Dytiscidae)

: Predaceous Diving Beetle

: Predaceous Diving Beetle inside a standard-sized tea/coffee cup

: Predaceous Diving Beetle

: Predaceous Diving Beetle

: Stonefly (adult) (the immatures/nymphs are aquatic) (Order Plecoptera)

: Stonefly (adult)

: Small Winter Stoneflies (Old Town, Maine; 3/11/2022) (possibly Allocapnia recta) (Photo credit: courtesy of Edward S. Grew)

: Waterscorpion (Family Nepidae)

: Waterscorpion

: Waterscorpion

: Water Striders (Family Gerridae)

: Water Striders at Acadia National Park’s “Bubble Pond” (August, 2010)

Additional Photos and Information:

Backswimmers (UWM)
Black Flies (the larvae are aquatic)
Caddisflies (the nymphs are aquatic) (BugGuide.net)
- Oligostomis ocelligera (BugGuide.net)
Damselflies (the nymphs are aquatic) (BugGuide.net)
Deer Flies (their larvae are aquatic)
Dobsonflies (the larvae are aquatic)
Dragonflies (the nymphs are aquatic)
- Autumn Meadowhawk (BugGuide.net)
- Fawn Darner (BugGuide.net)
- Twelve-spotted Skimmer (BugGuide.net)
Drain Flies (also called Moth Flies) (found around sewage or other wet areas, indoors and/or outdoors)
Fishflies (the larvae are aquatic)
Giant Water Bug (commonly called a “Toe-biter”)
Horse Flies (some horse fly larvae are aquatic)
Mayflies (the nymphs are aquatic) (Michigan State Univ. Extension)
Mosquitoes (Maine Forest Service) see also:
- Mosquito Biology (UMaine Extension)
- Mosquito Management (UMaine Extension)
- Insect Repellents (UMaine Extension)
- West Nile Virus (CDC)
- Preventing Eastern Equine Encephalitis (EEE) Virus in Maine
Moth Flies (also called Drain Flies) (found around sewage or other wet areas, indoors and/or outdoors)
Predaceous Diving Beetles (BugGuide.net)
Stoneflies (the nymphs are aquatic) (BugGuide.net)
- Small Winter Stoneflies (Family Capniidae)
- Winter Stoneflies (Family Taeniopterygidae)
Water Boatmen (UWM)
Water Scavenger Beetles (Texas A&M)
Water Scorpions
Water Striders

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