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Predaceous Diving Beetle (Acilius mediatus)


Detailing the physical features, habits, territorial reach and other identifying qualities of the Predaceous Diving Beetle.




This beetle was made for the water, and its a fast and agile swimmer in ponds, streams, and lakes.



 Updated: 4/30/2020; Authored By Staff Writer; Content ©www.InsectIdentification.org




Predaceous Diving Beetles are also called water tigers. They eat a variety of aquatic prey like other insect larvae and naiads. This species has feathery legs that help it navigate through water. It is oval shaped and small. A gold sheen covers the head and upper half of the body, while the lower black half is decorated with a bright golden yellow zigzag line that crosses the bottom of the wing coverings. Smaller flecks of golden color are also seen closer to the tip of the abdomen. A dark ‘M’-shaped line is stamped on the top of the head, and a dark line almost completely crosses the pronotum (neck area). Males have feet shaped like discs. Larvae look like armored worms with large pincers at the face.

When resting, this beetle may sit just under the water’s surface with its rear up sticking up. It is able to trap air bubbles under the elytra or wing coverings. It moves fluidly and quickly. It does have wings and can fly. This is useful in finding other freshwater habitats, even temporary ones created by rain or flooding. Look for them in small and large bodies of freshwater, especially near vegetation that grows out of the water. These areas are usually rich with small aquatic life.


General Characteristics
Capability, Shape, Texture/Pattern, Benefits, Dangers


Taxonomic Hierarchy
Species Breakdown
Kingdom: Animalia
  Phylum: Arthropoda
    Class: Insecta
      Order: Coleoptera
        Family: Dytiscidae [ View More ]
          Genus: Acilius [ View More ]
            Species: mediatus
Identifying Information
Size, Colors, Descriptors
Scientific Name: Acilius mediatus
Category: Beetle
Size (Adult; Length): 10mm to 16mm (0.39in to 0.62in)
Colorwheel Graphic Colors: black; yellow; gold
Descriptors: swimming; fins; gold zigzag; gold bottom; letter M on head; golden; water
Relative Size Comparison
Lo: 10mm | Hi: 16mm
Territorial Reach (A-to-Z)
U.S., Canada, and Mexico
Alabama
Alaska
Arizona
Arkansas
California
Colorado
Connecticut
Delaware
Florida
Georgia
Hawaii
Idaho
Illinois
Indiana
Iowa
Kansas
Kentucky
Louisiana
Maine
Maryland
Massachusetts
Michigan
Minnesota
Mississippi
Missouri
Montana
Nebraska
Nevada
New Hampshire
New Jersey
New Mexico
New York
North Carolina
North Dakota
Ohio
Oklahoma
Oregon
Pennsylvania
Rhode Island
South Carolina
South Dakota
Tennessee
Texas
Utah
Vermont
Virginia
Washington
West Virginia
Wisconsin
Wyoming
Canadian National Flag Graphic
Alberta
British Columbia
Manitoba
New Brunswick
Newfoundland and Labrador
Nova Scotia
Ontario
Prince Edward Island
Quebec
Saskatchewan
Mexican National Flag Graphic
Mexico
Note: An insect's reach is not limited by lines drawn on a map and therefore species may appear in areas, regions and/or states beyond those listed above as they are driven by environmental factors (such as climate change), available food supplies and mating patterns.
Territorial Map
U.S., Canada, and Mexico
Alaska  
Hawaii  
Prince Edward Is.  
State of Alabama graphic
State of Arizona graphic
State of Arkansas graphic
State of California graphic
State of Colorado graphic
State of Delware graphic
State of Florida graphic
State of Georgia graphic
State of Idaho graphic
State of Illinois graphic
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State of Kansas graphic
State of Kentucky graphic
State of Louisiana graphic
State of Maine graphic
State of Maryland graphic
State of Michigan graphic
State of Minnesota graphic
State of Mississippi graphic
State of Missouri graphic
State of Montana graphic
State of Nebraska graphic
State of Nevada graphic
State of New England graphic
State of New Jersey graphic
State of New Mexico graphic
State of New York graphic
State of North Carolina graphic
State of North Dakota graphic
State of Ohio graphic
State of Oklahoma graphic
State of Oregon graphic
State of Pennsylvania graphic
State of South Carolina graphic
State of South Dakota graphic
State of Tennessee graphic
State of Texas graphic
State of Utah graphic
State of Virginia graphic
State of Washington graphic
State of West Virginia graphic
State of Wisconsin graphic
State of Wyoming graphic
Canadian territory of Alberta graphic
Canadian territory of British Columbia graphic
Canadian territory of Manitoba graphic
Canadian territory of New Brunswick graphic
Canadian territory of Newfoundland and Labrador graphic
Canadian territory of Ontario graphic
Canadian territory of Quebec graphic
Canadian territory of Saskatchewan graphic
Territory map graphic of the country of Mexico
Contiguous United States shape map layer graphic


Beetle Anatomy
Graphic showing basic anatomy of a common North American Beetle insect
1
Antennae: Beetles have a pair of antennae on the head used for sensing.
2
Head: The head is home to the insect's eyes, antennae, and mandibles (jaws).
3
Thorax: Holds the three pairs of legs as well as vital internal organs.
4
Elytron: One of two wing cases on a Beetle that protects its wings (plural: elytra).
5
Wings: Appendages used for flying and kept under the elytra until needed.
6
Abdomen: Houses organs related to circulation, reproduction, and excretion.
7
Legs: Beetles have three pairs of legs located at the thorax, numbering six legs in all.