Brewster River

ORDER: Diptera
FAMILY: Chironomidae

 Midge larvae tend to be the most common macroinvertebrate at our sites.  As with other Diptera, there are no true jointed legs.  Chironomids do have a pair of prolegs at each end and preserved individuals tend to curl into a 'C'.  Identification past family requires slide-mounted heads.  We have seen philopotamid caddisflies misidentified with the chironomids and we suspect that that happens when samples are being sorted from trays.  Under a microscope, six prominent legs can be seen on the philopotamids.

ORDER: Ephemeroptera
FAMILY: Baetidae 
GENUS: Baetis 

This mayfly has three "tails" and a unique head shape. Its gills are oval shaped and insert dorsally. The wing pad shape is an obvious characteristic. More mature nymphs have long, dark wing pads. SMC

ORDER: Trichoptera
FAMILY: Helicopsychidae
GENUS: Helicopsyche

This caddisfly genus has one local species.  It looks rather like a snail but has lots of sand grains covering it's 'shell' which is really a case.  The anal claws have closely-spaced teeth, much like a small comb.

ORDER: Ephemeroptera
FAMILY: Baetidae 

This family of mayfly is characterized by antennae longer than the width of their head and a notch in their labrum. The most common genus we found was Baetis.
NABS

ORDER: Ephemeroptera
FAMILY: Ephemerellidae
GENUS: Drunella

The mayfly Drunella is distinguished by its large femoral “biceps” on the front legs. The body rests in one plane with the biceps at the same level as the head and junction with the thorax.

ORDER: Coleoptera
FAMILY: Psephenidae
GENUS: Psephenus

The true "water penny" is commonly found in the waters sampled. Psephenus has a rounded shape with relatively smooth edge. The false water penny, whose edges are serrated, has a more oval appearance. The gills on the ventral surface are found only in the true water pennies. SMC

ORDER: Diptera
FAMILY: Tipulidae
GENUS: Antocha

This small dipteran in the cranefly family is quite common.  It is distinguished from most other dipterans we found by the 'creeping welts' that appear as prominent dark stripes along the abdomen.  The dark head is usually partly exposed; however, it can be pulled back into the thoracic cavity during preservation.
NABS

ORDER: Plecoptera
FAMILY: Perlodidae
 

Stoneflies in the Perlodidae family do not have branching gills from leg bases. When observing their mouthparts, the glossa and paraglossa form a large three-pronged notch, or opening. Hind wing pads are divergent. Cerci, or "tails," are as long or longer than the abdomen.

WWW.TROUTNUT.COM

ORDER: Plecoptera 
FAMILY: Capniidae
GENUS: Capnia

Capnia  stoneflies have hind wing pads that are are broad as they are long. An important distinction of the Capniidae  family is the membranous pleural folds that run down the posterior abdomen segments 1-9. These look like two lines running parallel down the back of the abdomen.

Capnia are distinguished by femurs and tibia of forelegs with less than 20 fine hairs and no dorsal femoral fringe hairs.

ORDER: Ephemeroptera
FAMILY: Heptageniidae
GENUS: Epeorus. 

A mayfly with two 'tails'!  This family of mayflies has distinctly flattened heads, and this particular genus has two tails and a unique gill arrangement.
NABS