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Artistic view of a Male Pteronarcys californica (Pteronarcyidae) (Giant Salmonfly) Stonefly Adult from the Gallatin River in Montana

Salmonflies
Pteronarcys californica

The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.

Sixmile Creek in New York

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Coleoptera (Beetle) Insect Larva Coleoptera (Beetle) Insect Larva

Lateral view of a Coleoptera (Beetle) Insect Larva from Sears Creek in Washington

6 Recently Added Photos

27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.

Troutnut is a project started in 2003 by salmonid ecologist Jason "Troutnut" Neuswanger to help anglers and fly tyers unabashedly embrace the entomological side of the sport. Learn more about Troutnut or support the project for an enhanced experience here.

Fly Angler's Glossary of Aquatic Entomology

Fly Angler's Glossary of Aquatic Entomology

I use a lot of fly fishing, photography, and especially entomology jargon on this site. The site incorporates these definitions wherever they're used, but and this page lists together every single form of every term used on this site.

You can also click a link from one of the in-line definitions across the site to come to its full definition page, seeing sub-definitions used within it highlighted and illustrated.

1A (in caddisflies)

1A vein (in caddisflies)

2A (in caddisflies)

2A vein (in caddisflies)

3A vein (in caddisflies)

4A vein (in caddisflies)

5A vein (in caddisflies)

A₁ (in mayflies)

A₁ (in stoneflies)

A₁ vein (in mayflies)

A₁ vein (in stoneflies)

A₂ (in mayflies)

A₂ (in stoneflies)

A₂ vein (in mayflies)

A₂ vein (in stoneflies)

A3 (in caddisflies)

A₃ (in stoneflies)

A₃ vein (in stoneflies)

A4 (in caddisflies)

A5 (in caddisflies)

abdominal setal area

abdominal setal areas

alimentary canal

anal cell (in caddisflies)

anal cell (in stoneflies)

anal cells (in caddisflies)

anal cells (in stoneflies)

anal region (in stoneflies)

anal vein (in caddisflies)

anal vein (in mayflies)

anal vein (in stoneflies)

anal veins (in caddisflies)

anal veins (in mayflies)

anal veins (in stoneflies)

anastomosis (in caddisflies)

antero-dorsally

antero-laterally

antero-medially

anterolaterally

apico-laterally

arculus (in caddisflies)

arculus (in stoneflies)

behavioral drift

behavioral drifting

C (in caddisflies)

C (in mayflies)

C (in stoneflies)

C vein (in caddisflies)

C vein (in mayflies)

caudal filament

caudal filaments

cell dc (in caddisflies)

cell mc (in caddisflies)

cell tc (in caddisflies)

cephalopharyngeal skeleton

chloride epithelia

chloride epithelium

chords (in caddisflies)

conical mesonotal projection

conical mesonotal projections

cord (in caddisflies)

costa (in caddisflies)

costa (in mayflies)

costa (in stoneflies)

costal (in caddisflies)

costal (in mayflies)

costal (in stoneflies)

costal angulation

costal cell (in mayflies)

costal cells (in mayflies)

costal cross veins

costal cross veins (in mayflies)

costal crossvein

costal crossvein (in mayflies)

costal crossveins

costal crossveins (in mayflies)

costal processes

costal projection

costal projections

costal space (in caddisflies)

costal space (in caddisflies)

costal space (in mayflies)

costal space (in stoneflies)

costal vein (in caddisflies)

costal vein (in mayflies)

costal vein (in stoneflies)

costal-apical region

costal-apical space

costals (in mayflies)

costo-apical area

costo-apical region

costo-apical space

crossvein cu-a (in caddisflies)

crossvein cu-a (in stoneflies)

crossvein m (in caddisflies)

crossvein m-cu (in caddisflies)

crossvein m-cu (in stoneflies)

crossvein r (in caddisflies)

crossvein r-m (in caddisflies)

crossvein r-m (in stoneflies)

crossvein r-rs (in caddisflies)

crossvein s (in caddisflies)

crossvein sc-r (in caddisflies)

Cu (in caddisflies)

Cu (in stoneflies)

Cu vein (in caddisflies)

Cu vein (in stoneflies)

cu-a (in caddisflies)

cu-a (in stoneflies)

cu-a crossvein (in caddisflies)

cu-a crossvein (in stoneflies)

Cu₁ (in caddisflies)

Cu₁ (in mayflies)

Cu₁ vein (in caddisflies)

Cu₁ vein (in mayflies)

Cu_1a (in caddisflies)

Cu_1a vein (in caddisflies)

Cu_1b (in caddisflies)

Cu_1b vein (in caddisflies)

Cu₂ (in caddisflies)

Cu₂ (in mayflies)

Cu₂ (in stoneflies)

Cu₂ (in stoneflies)

Cu₂ vein (in caddisflies)

Cu₂ vein (in mayflies)

Cu₂ vein (in stoneflies)

Cu₂ vein (in stoneflies)

CuA (in mayflies)

CuA vein (in mayflies)

cubital intercalary vein (in mayflies)

cubital intercalary veins (in mayflies)

cubito-anal crossvein

cubito-anal crossvein (in caddisflies)

cubito-anal crossvein (in stoneflies)

cubito-anal crossveins

cubito-anal region

cubitoanal crossvein

cubitoanal crossvein (in stoneflies)

cubitoanal crossveins

cubitoanal region

cubitus (in caddisflies)

cubitus (in stoneflies)

cubitus anterior (in mayflies)

cubitus posterior (in mayflies)

CuP (in mayflies)

CuP vein (in mayflies)

dc (in caddisflies)

dc cell (in caddisflies)

disc (in caddisflies)

disc (in mayflies)

disc (in stoneflies)

discoidal cell (in caddisflies)

discs (in caddisflies)

discs (in mayflies)

discs (in stoneflies)

first anal cell

first anal cell (in caddisflies)

first radial vein (in caddisflies)

first radial vein (in mayflies)

first radial vein (in stoneflies)

fore trochantin

fore trochantins

foretrochantins

fork 1 (in caddisflies)

fork 2 (in caddisflies)

fork 3 (in caddisflies)

fork 4 (in caddisflies)

fork 5 (in caddisflies)

fork I (in caddisflies)

fork II (in caddisflies)

fork III (in caddisflies)

fork IV (in caddisflies)

fork V (in caddisflies)

frontal process

frontal processes

frontal shelves

hypogynial valve

hypogynial valves

IMA (in mayflies)

IMA vein (in mayflies)

IMP (in mayflies)

IMP vein (in mayflies)

inter-cubital crossvein (in stoneflies)

inter-cubital crossveins

intercalary bristle

intercalary bristles

intercalary medius anterior (in mayflies)

intercalary medius posterior (in mayflies)

intercalary seta

intercalary setae

intercalary vein

intercalary veins

intercubital crossvein (in stoneflies)

intercubital crossveins (in stoneflies)

interpenial cleft

lateral stylets

latero-apically

longitudinal vein

longitudinal veins

M (in caddisflies)

m (in caddisflies)

M (in mayflies)

M (in stoneflies)

m crossvein (in caddisflies)

M vein (in caddisflies)

M vein (in mayflies)

M vein (in stoneflies)

m-cu (in caddisflies)

m-cu (in stoneflies)

m-cu crossvein (in caddisflies)

m-cu crossvein (in stoneflies)

M₁ (in caddisflies)

M₁ (in stoneflies)

M₁ vein (in caddisflies)

M₁ vein (in stoneflies)

M₁₊₂ (in caddisflies)

M₁₊₂ (in stoneflies)

M₁₊₂ vein (in caddisflies)

M₁₊₂ vein (in stoneflies)

M₂ (in caddisflies)

M₂ (in stoneflies)

M₂ vein (in caddisflies)

M₂ vein (in stoneflies)

M₃ (in caddisflies)

M₃ (in stoneflies)

M₃ vein (in caddisflies)

M₃ vein (in stoneflies)

M₃₊₄ (in caddisflies)

M₃₊₄ (in stoneflies)

M₃₊₄ vein (in caddisflies)

M₃₊₄ vein (in stoneflies)

M₄ (in caddisflies)

M₄ (in stoneflies)

M₄ vein (in caddisflies)

M₄ vein (in stoneflies)

MA (in caddisflies)

MA (in mayflies)

MA vein (in caddisflies)

MA vein (in mayflies)

MA₁ (in mayflies)

MA₁ vein (in mayflies)

MA₂ (in mayflies)

MA₂ vein (in mayflies)

marginal intercalaries

marginal intercalary

marginal intercalary vein

marginal intercalary veins

masking hatches

maxillary palpae

maxillary palpal

maxillary palpi

maxillary palps

maxillary palpus

mc (in caddisflies)

mc cell (in caddisflies)

media (in caddisflies)

media (in mayflies)

media (in stoneflies)

media anterior (in mayflies)

media posterior (in mayflies)

medial cell (in caddisflies)

medial crossvein (in caddisflies)

medio-cubital crossvein (in caddisflies)

medio-cubital crossvein (in stoneflies)

mediocubital crossvein (in stoneflies)

medius anterior (in mayflies)

medius posterior (in mayflies)

mesobasisternal

mesobasisternum

mesofurcasternal

mesofurcasternum

mesonotal setal area

mesonotal setal areas

mesosternal Y-arm

mesosternal Y-arms

mesosternal Y-stem

mesosternal Y-stems

metabasisternal

metabasisternum

metacephalic rod

metacephalic rods

metafurcasternum

metanotal setal areas

metanotal setal areas

metanotal setal wart

metanotal setal warts

MP (in mayflies)

MP vein (in mayflies)

MP₁ (in mayflies)

MP₁ vein (in mayflies)

MP₂ (in mayflies)

MP₂ vein (in mayflies)

nygma (in caddisflies)

occipital foramen

occipital ridge

occipital ridges

ocellar triangle

paragenital plate

paragenital plates

parthenogenesis

patella-tibial suture

patella-tibial sutures

patello-tibial suture

patello-tibial sutures

pharyngeal skeleton

postero-lateral

postero-laterally

postero-medially

postero-mesally

posterolaterally

posteromedially

posteroventrally

postfurcasternal

postfurcasterum

prosternal horn

prosternal horns

pterostigma (in caddisflies)

ptilinal suture

ptilinal sutures

R (in caddisflies)

R (in mayflies)

R (in stoneflies)

r crossvein (in caddisflies)

R vein (in caddisflies)

R vein (in mayflies)

R vein (in stoneflies)

r-m (in caddisflies)

r-m (in stoneflies)

r-m crossvein (in caddisflies)

r-m crossvein (in stoneflies)

r-rs crossvein (in caddisflies)

r-sc crossvein (in caddisflies)

R₁ (in caddisflies)

R₁ (in mayflies)

R₁ (in stoneflies)

R₁ vein (in caddisflies)

R₁ vein (in mayflies)

R₁ vein (in stoneflies)

R₂ (in caddisflies)

R₂ (in mayflies)

R₂ vein (in caddisflies)

R₂ vein (in mayflies)

R₂₊₃ (in caddisflies)

R₂₊₃ vein (in caddisflies)

R₃ (in caddisflies)

R₃ (in mayflies)

R₃ vein (in caddisflies)

R₃ vein (in mayflies)

R₄ (in caddisflies)

R₄ vein (in caddisflies)

R₄₊₅ (in caddisflies)

R₄₊₅ (in mayflies)

R₄₊₅ vein (in caddisflies)

R₄₊₅ vein (in mayflies)

R₅ (in caddisflies)

R₅ vein (in caddisflies)

radial (in caddisflies)

radial (in mayflies)

radial (in stoneflies)

radial crossvein (in caddisflies)

radial sector (in caddisflies)

radial sector (in mayflies)

radial sector (in stoneflies)

radial space (in mayflies)

radio-medial crossvein (in caddisflies)

radio-medial crossvein (in stoneflies)

radiomedial crossvein (in stoneflies)

radius (in caddisflies)

radius (in mayflies)

radius (in stoneflies)

root of fore wing

root of forewing

root of hind wing

Rs (in caddisflies)

Rs (in mayflies)

Rs (in stoneflies)

Rs vein (in caddisflies)

Rs vein (in mayflies)

Rs vein (in stoneflies)

s (in caddisflies)

s crossvein (in caddisflies)

Sc (in caddisflies)

Sc (in mayflies)

Sc (in stoneflies)

Sc vein (in caddisflies)

searching pattern

searching patterns

second anal cell

second anal cell (in caddisflies)

second radial vein (in mayflies)

sectorial crossvein (in caddisflies)

sensilla basiconica

sensilla basiconicum

spiracular plate

spiracular plates

sternacostal suture

sternacostal sutures

stigma (in caddisflies)

stigmatic (in caddisflies)

subcosta (in caddisflies)

subcosta (in mayflies)

subcosta (in mayflies)

subcosta (in stoneflies)

subcostal (in caddisflies)

subcostal (in mayflies)

subcostal (in stoneflies)

subcostal vein (in caddisflies)

subcostal vein (in mayflies)

subcostal vein (in stoneflies)

subgenital plate

subgenital plates

tc (in caddisflies)

tc cell (in caddisflies)

terminal filament

terminal filaments

terminal segment

terminal segments

the invertebrate drift

third radial vein (in mayflies)

thyridial cell (in caddisflies)

thyridium (in caddisflies)

vein 1A (in caddisflies)

vein 2A (in caddisflies)

vein 3A (in caddisflies)

vein 4A (in caddisflies)

vein 5A (in caddisflies)

vein A₁ (in mayflies)

vein A₁ (in stoneflies)

vein A₂ (in mayflies)

vein A₂ (in stoneflies)

vein A₃ (in stoneflies)

vein C (in caddisflies)

vein C (in mayflies)

vein C (in stoneflies)

vein Cu (in caddisflies)

vein Cu (in stoneflies)

vein Cu₁ (in caddisflies)

vein Cu₁ (in mayflies)

vein Cu₁ (in stoneflies)

vein Cu₁ (in stoneflies)

vein Cu_1a (in caddisflies)

vein Cu_1b (in caddisflies)

vein Cu₂ (in caddisflies)

vein Cu₂ (in mayflies)

vein Cu₂ (in stoneflies)

vein CuA (in mayflies)

vein CuP (in mayflies)

vein IMA (in mayflies)

vein IMP (in mayflies)

vein M (in caddisflies)

vein M (in mayflies)

vein M (in stoneflies)

vein M₁ (in caddisflies)

vein M₁ (in stoneflies)

vein M₁₊₂ (in caddisflies)

vein M₁₊₂ (in stoneflies)

vein M₂ (in caddisflies)

vein M₂ (in stoneflies)

vein M₃ (in caddisflies)

vein M₃ (in stoneflies)

vein M₃₊₄ (in caddisflies)

vein M₃₊₄ (in stoneflies)

vein M₄ (in caddisflies)

vein M₄ (in stoneflies)

vein MA (in caddisflies)

vein MA (in mayflies)

vein MA₁ (in mayflies)

vein MA₂ (in mayflies)

vein MP (in mayflies)

vein MP₁ (in mayflies)

vein MP₂ (in mayflies)

vein R (in caddisflies)

vein R (in mayflies)

vein R (in stoneflies)

vein R₁ (in caddisflies)

vein R₁ (in mayflies)

vein R₁ (in stoneflies)

vein R₂ (in caddisflies)

vein R₂ (in mayflies)

vein R₂₊₃ (in caddisflies)

vein R₃ (in caddisflies)

vein R₃ (in mayflies)

vein R₄ (in caddisflies)

vein R₄₊₅ (in caddisflies)

vein R₄₊₅ (in mayflies)

vein R₅ (in caddisflies)

vein Rs (in caddisflies)

vein Rs (in mayflies)

vein Rs (in stoneflies)

vein Sc (in caddisflies)

vein Sc (in mayflies)

vein Sc (in stoneflies)

ventrolaterally

wing articulation

wing articulations

zoogeographical

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