Ephemeroptera Lab Quiz

Aquatic Invertebrates - 5350.01

Leptohyphidae

• 'Little Stout Crawler Mayflies'.

• Characterized by operculate triangular gills located on the 2nd abdominal segment.

• Typically measure less than 10 mm in length.

Ephemeridae

• 'Burrowing Mayflies'.

• Identified by upward facing tusks, which assist in burrowing.

• Have feathery gills along the abdomen and a 'U' shaped projection on the front of the head.

• Usually measure between 12-20 mm.

Caenidae

• 'Small Square-gilled Mayflies'.

• Feature very small sizes with large operculate square wingpads that meet medially.

• Often possess spines on the protibia and protarsus.

Isonychiidae

• 'Brush-legged Mayflies'.

• Exhibit a minnow-like body shape that is long and ovular.

• Have feathery gills that spread laterally and long spines adorning the forelegs.

Baetiscidae

• 'Armored Mayflies'.

• Notable for a large armored backplate that covers most of the abdomen, serving as protection.

• Characteristically small in size.

Baetidae

• 'Small Minnow Mayflies'.

• Feature very long antennae, small round ventral gills, and minnow-like body shapes.

• Distinguished by a notch on the labrum.

Potamanthidae

• 'Hackle-gills'.

• Feature pronounced, straight, or downcurved tusks on the head.

• Have forked long sharp gills on segments 2-7 and possess slender legs.

Heptageniidae

• 'Flat-headed Mayflies'.

• Characterized by a flat head that protrudes laterally

• Typically possess small gills along each side and may have only two cerci at the rear.

Flat-headed Mayflies

Heptageniidae

Hackle-gills

Potamanthidae

Small Minnow Mayflies

Baetidae

Armored Mayflies

Baetiscidae

Brush-legged Mayflies

Isonychiidae

Burrowing Mayflies

Ephemeridae

Small Square-gilled Mayflies

Caenidae

Little Stout Crawler Mayflies

Leptohyphidae