Water Beetles
(Phylum Arthropoda, Class Insecta, Order Coleoptera)

Instructions: For a larger view of the specimens below, click on an image. The enlarged image will appear on your screen in a new window. Close this new window when you are through viewing it. See note below regarding identification of macros. Further information on the identification and ecology of aquatic macroinvertebrates can be found from the materials mentioned on the Macro Resources Page.


Riffle Beetle - adults (Family Elmidae)
Tolerance: Ordobrevia nubifera - moderate; Optioservus - tolerant; Zaitzevia - tolerant
free-living
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3 genera of beetles
Daybreak Park
East Fork Lewis River
August 2006
free-living
db_aug06-1547.jpg
genus: Ordobrevia*
Daybreak Park
East Fork Lewis River
August 2006
free-living
db_aug06-1542.jpg
genus: Optioservus*
Daybreak Park
East Fork Lewis River
August 2006
free-living
db_aug06-1552.jpg
genus: Zaitzevia*
Daybreak Park
East Fork Lewis River
August 2006
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Image 171
genus: Ordobrevia*
East Fork Lewis River
Daybreak Park
June 2004
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Image 104
genus: Optioservus*
(3 mm)
Salmon Creek
Hockinson, WA
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Image 21
genus: Optioservus*
(2 mm)
East Fork Lewis River
Lewisville Park
ef_f04-24
ef_f04-24
genus: Optioservus*
(2 mm)
East Fork Lewis River
Lewisville Park
Sep 29, 2004
tlp5-11-05_35.jpg
efl_sep05_83.jpg
genus: Optioservus*

East Fork Lewis River
Lewisville Park
September 2005
tlp5-11-05_35.jpg
up_efl_70.jpg
genus: Optioservus*
(2 mm)
East Fork Lewis River
upper watershed
September 2005
tlp5-11-05_35.jpg
up_efl_23.jpg
genus: Optioservus*
(1.5 mm)
East Fork Lewis River
upper watershed
September 2005

tlp5-11-05_35.jpg
up_efl_54.jpg
Zaitzevia* & Optioservus*
(2 mm - each)
East Fork Lewis River
upper watershed
September 2005

tlp5-11-05_35.jpg
up_efl_68.jpg
genus: Zaitzevia*
(2 mm)
East Fork Lewis River
upper watershed
September 2005
ef_f04-20
slm_dec-05_2093.jpg
genus: Zaitzevia*
(2 mm)
Salmon Creek
near Hockinson, WA
December 2005

Harmony Dr. macro
harmony-264.jpg
genus: Zaitzevia*

Harmony Dr.
Longview, WA
July 2006


Riffle Beetle - larva (Family Elmidae)
Tolerance: Zaitzevia - tolerant; Narpus - moderate; Optioservus - tolerant; Lara - moderate
ef_f04-18
ef_f04-18
genus: Zaitzevia*
(5 mm)
East Fork Lewis River
Lewisville Park
Sep. 29, 2004
ef_f04-17
ef_f04-17
genus: Zaitzevia*
(5 mm)
East Fork Lewis River
Lewisville Park
Sep. 29, 2004

efl4-03-05_30.jpg
genus: Zaitzevia*
(5 mm)
East Fork Lewis River
Lewisville Park
April 2005
ef_f04-81
ef_f04-81
genus: Zaitzevia*
East Fork Lewis River
Lewisville Park
Nov. 19, 2004
ef_f04-80
ef_f04-80
genus: Zaitzevia*
East Fork Lewis River
Lewisville Park
Nov. 19, 2004
ef_f04-20
slm_dec-05_67.jpg
genus: Zaitzevia*
Salmon Creek
near Hockinson, WA
December 2005
free-living
db_aug06-1433.jpg
riffle beetle larvae
Daybreak Park
East Fork Lewis River
August 2006
free-living
db_aug06-1474.jpg
genus: Narpus*
Daybreak Park
East Fork Lewis River
August 2006
ef_f04-21
ef_f04-21
genus: Narpus*
(9 mm)
East Fork Lewis River
Lewisville Park
Sep. 29, 2004
ef_f04-22
ef_f04-22
genus: Narpus*
(9 mm)
East Fork Lewis River
Lewisville Park
Sep. 29, 2004
tlp5-11-05_35.jpg
up_efl_150.jpg
genus: Narpus*

East Fork Lewis River
upper watershed
September 2005
tlp5-11-05_35.jpg
efl_sep05_18_1.jpg
genus: Narpus*

East Fork Lewis River
Lewisville Park
September 2005
ef_f04-20
ef_f04-20
genus: Optioservus*
(4 mm)
East Fork Lewis River
Lewisville Park
Sep. 29, 2004
ef_f04-20
slm_dec-05_60.jpg
genus: Optioservus*

Salmon Creek
near Hockinson, WA
December 2005
ef_f04-20
slm_dec-05_51.jpg
genus: Optioservus*

Salmon Creek
near Hockinson, WA
December 2005
ef_f04-20
lacamas_nov05_31.jpg
genus: Optioservus*
(4 mm)
Lacams Creek
Clark County
November 2005
ef_f04-20
lacamas_nov05_28.jpg
genus: Optioservus*
(4 mm)
Lacams Creek
Clark County
November 2005
tlp5-11-05_35.jpg
up_efl_86.jpg

(5 mm)
East Fork Lewis River
upper watershed
September 2005
tlp5-11-05_35.jpg
up_efl_90.jpg

(5 mm)
East Fork Lewis River
upper watershed
September 2005

Harmony Dr. macro
harmony-222.jpg
genus: Lara
Harmony Dr.
Longview, WA
July 2006

Harmony Dr. macro
harmony-IMG_0412.jpg
genus: Lara
Harmony Dr.
Longview, WA
July 2006

Harmony Dr. macro
harmony-069.jpg
genus: Lara
Harmony Dr.
Longview, WA
July 2006
Harmony Dr. macro
harmony-073.jpg
posterior detail: gills & hooks
genus: Lara.
Longview, WA
July 2006

Predaceous Diving Beetles (Family Dytiscidae)
Tolerance: tolerant
18.jpg
Image 18
(adult - 4 mm)
East Fork Lewis River
Lewisville Park
tlp5-11-05_35.jpg
up_efl_93.jpg
(adult)
East Fork Lewis River
upper watershed
September 2005
tlp5-11-05_2.jpg
tlp5-11-05_2.jpg
(adult)
Tiger Lily pond
Spring 2005
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tlp5-11-05_94.jpg
(larva)
Tiger Lily pond
Spring 2005
tlp5-11-05_94.jpg
tlp5-11-05_97.jpg
(larva)
Tiger Lily pond
Spring 2005
tlp5-11-05_94.jpg
tlp5-11-05_87.jpg
(larva)
Tiger Lily pond
Spring 2005
tlp5-11-05_94.jpg
(larva)
Todd Rd. pond
Spring 2010
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(larva)
Todd Rd. pond
Spring 2010
tlp5-11-05_94.jpg
(larva)
Todd Rd. pond
Spring 2010
tlp5-11-05_29.jpg
tlp5-11-05_29.jpg
(larva)
Tiger Lily pond
Spring 2005
tlp5-11-05_29.jpg
tlp5-11-05_30.jpg
(larva)
Tiger Lily pond
Spring 2005
18.jpg
pred_beetle.jpg
(larva)

Whirligig Beetle (Family Gyrinidae)
Tolerance: tolerant
16.jpg
Image 16
(adult)
East Fork Lewis River
Lewisville Park

Water Penny (Family Psephenidae)
Tolerance: tolerant

16.jpg
penny_top.jpg
(larva - top view)
Clear Creek - Carver boat ramp
Clackamas Co., Oregon
July 2005

16.jpg
penny_below.jpg
(larva - bottom view)
Clear Creek - Carver boat ramp
Clackamas Co., Oregon
July 2005

Water Scavenger Beetle (Family Hydrophilidae)
Tolerance: moderate
19.jpg
Image 19
(adult - 10 mm)
East Fork Lewis River
Lewisville Park
20.jpg
Image 20
(adult - 10 mm)
East Fork Lewis River
Lewisville Park

Crawling Water Beetle (Family Haliplidae)
Tolerance: tolerant
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Image 185
(adult)
private pond
Clark County, WA
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Image 184
(adult)
private pond
Clark County, WA
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Image 183
(adult)
private pond
Clark County, WA
tlp5-11-05_94.jpg
(larva)
Todd Rd. pond
Spring 2010
tlp5-11-05_94.jpg
(larva)
Todd Rd. pond
Spring 2010


Note from author: Considerable effort has been made to be as accurate as possible in the identification of the organisms. While I am fairly confident of the ID (at least for the major taxon levels), I cannot guarantee complete accuracy. In particular, you will notice that some organisms are labeled with a (*). This indicates a probable classification based on general traits (shape, size and color) of the organism and location from which it was found. I do not possess the level of expertise nor did I conduct the kind of detailed inspection to provide a conclusive ID -- consider these efforts at classification as my "best guess" based on available information and, in some instance, outside assistance. (If you notice any errors or omissions, please contact me at the email address provided at the bottom of this page.)

Back to: Aquatic Macros Index


modified: July 2009