order
![](/images/illustrations/illustration_coleoptera_adult_v_160.png)
Coleoptera
“Adult Beetles”
![](/images/illustrations/illustration_coleoptera_larva_v_160.png)
Coleoptera
“Larval Beetles”
![](/images/illustrations/illustration_diptera_larva_v_160.png)
Diptera
“True Flies”
![](/images/illustrations/illustration_ephemeroptera_larva_v_160.png)
Ephemeroptera
“Mayflies”
![](/images/illustrations/illustration_hemiptera_adult_v_160.png)
Hemiptera
“True Bugs”
![](/images/illustrations/illustration_lepidoptera_larva_v_160.png)
Lepidoptera
“Aquatic Caterpillars, Snout Moths”
![](/images/illustrations/illustration_megaloptera_larva_v_160.png)
Megaloptera
“Alderflies, Dobsonflies, and Fishflies”
![](/images/illustrations/illustration_odonata_larva_v_160.png)
Odonata
“Dragonflies and Damselflies”
![](/images/illustrations/illustration_plecoptera_larva_v_160.png)
Plecoptera
“Stoneflies”
![](/images/illustrations/illustration_trichoptera_larva_v_160.png)
Trichoptera
“Caddisflies”
family
Ptilodactylidae
genus
Anchytarsus
“Toe-Winged Beetle Larvae”
Genus Overview
One species, Anchytarsus bicolor, in North America. Found in small, cool, streams. Not much is known about the biology and ecology. Life cycle might be 3 years.
Characteristics
POLLUTION TOLERANCE
Southeast: 3.8 and higher
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Shredder / Detritivore
Shredder / Herbivore
Shredder / Herbivore
MOVEMENT
Burrower
Clinger
Clinger
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-depositional
Lotic-erosional
Lotic-erosional
Diagnostic Characters
order
![](https://static.macroinvertebrates.org/gigapans/196090/images.4b8314189ab49c5ea22c6cd26c34de79/196090-120x120-1450-2350-4948-5848.jpg)
Eye Spots
![](https://static.macroinvertebrates.org/gigapans/196092/images.88a8700585a50aac00b0a9f585e974c0/196092-120x120-3860-6608-209-2957.jpg)
Lateral Gills USUALLY Absent
![](https://static.macroinvertebrates.org/gigapans/196090/images.4b8314189ab49c5ea22c6cd26c34de79/196090-120x120-3244-4575-2987-4317.jpg)
USUALLY 4-5-Segmented Legs
family
![](https://static.macroinvertebrates.org/gigapans/196090/images.4b8314189ab49c5ea22c6cd26c34de79/196090-120x120-987-2424-5022-6459.jpg)
3 or Less Antennal Segments
![](https://static.macroinvertebrates.org/gigapans/196090/images.4b8314189ab49c5ea22c6cd26c34de79/196090-120x120-3101-4848-2877-4623.jpg)
4-Segmented Legs
![](https://static.macroinvertebrates.org/gigapans/196090/images.4b8314189ab49c5ea22c6cd26c34de79/196090-120x120-5028-10820-465-6257.jpg)
9-Segmented Abdomen
![](https://static.macroinvertebrates.org/gigapans/196092/images.88a8700585a50aac00b0a9f585e974c0/196092-120x120-1186-2099-1293-2206.jpg)
Distinct Labrum
![](https://static.macroinvertebrates.org/gigapans/196092/images.88a8700585a50aac00b0a9f585e974c0/196092-120x120-12025-15572-230-3777.jpg)
Operculum lacking
![](https://static.macroinvertebrates.org/gigapans/196090/images.4b8314189ab49c5ea22c6cd26c34de79/196090-120x120-12799-14462-4286-5949.jpg)
Posterior Gill Tufts
+ Expanded Character List
Order:
Larvae: Usually without lateral abdominal gills. If gills present, then 4 hooks clustered on segment 10. Thoracic legs each usually with 4 or 5 segments and with 1 or 2 claws; if without legs, head distinctly sclerotized and posterior body (thorax and abdomen) simple, without gills, hair brushes, suckers, or breathing tube. Eye spots usually present, but compound eyes absent.
Family:
Thoracic legs are present with each having four segments and a claw; the labrum is distinct; the abdomen has 9 segments and distinct tufts of gills in the anal region but without a lid-like operculum.
Genus:
Operculate covering on 9th segment absent, ninth abdominal segment with numerous finger like anal gills,
![](https://static.macroinvertebrates.org/gigapans/196090/images.4b8314189ab49c5ea22c6cd26c34de79/196090-495x240.jpg)
![](https://static.macroinvertebrates.org/gigapans/196092/images.88a8700585a50aac00b0a9f585e974c0/196092-964x240.jpg)
Lateral
Ventral