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Caddisfly Genus Hydropsyche (Spotted Sedges)

Taxonomic Navigation -?-
» Genus Hydropsyche (Spotted Sedges)
Species in HydropsycheNumber of SpecimensNumber of Pictures
Hydropsyche aenigmaSpotted Sedge118
Hydropsyche alternansSpotted Sedge00
Hydropsyche betteniSpotted Sedge00
Hydropsyche bidensSpotted Sedge00
Hydropsyche bifidaSpotted Sedge00
Hydropsyche brontaSpotted Sedge00
Hydropsyche californicaSpotted Sedge15
Hydropsyche cockerelliSpotted Sedge00
Hydropsyche occidentalisSpotted Sedge00
Hydropsyche oslariSpotted Sedge00
Hydropsyche simulansSpotted Sedge00
Hydropsyche slossonaeSpotted Sedge00
Hydropsyche sparnaSpotted Sedge00
Hydropsyche vexaSpotted Sedge00

50 species aren't included.
Common Name
MatchCommon Name
***Spotted Sedges
Pictures Below
The most important genus in the most important family of caddis.

More to come - Page in edit mode.

Pictures of 5 Caddisfly Specimens in the Genus Hydropsyche:

Specimen Page:12
Hydropsyche aenigma (Spotted Sedge) Caddisfly AdultHydropsyche aenigma (Spotted Sedge) Caddisfly Adult View 18 PicturesThese big caddisflies were tempting trout as they wriggled out of their shucks (
Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.
Here's an underwater view of the pupal shucks of several already-emerged Brachycentrus numerosus caddisflies.
Shuck: The shed exoskeleton left over when an insect molts into its next stage or instar. Most often it describes the last nymphal or pupal skin exited during emergence into a winged adult.
)
, while others skated across the water at a medium pace, probably egg-laying.
Collected May 15, 2007 from the West Branch of the Delaware River in New York
Added to Troutnut.com by Troutnut on May 18, 2007
Hydropsyche (Spotted Sedges) Caddisfly PupaHydropsyche (Spotted Sedges) Caddisfly Pupa View 8 PicturesSeveral users have interesting comments in the discussion of this specimen, but this observation by Creno is especially good:

Also, this is what I would call an "immature" pupa. The wingpads of caddis pupae darken to nearly black as the enclosed adults near emerging. The darkening is the developing adult wing inside the pupal wing pad (
The wing pads on this final instar Baetidae mayfly nymph are extremely dark.
The wing pads on this final instar Baetidae mayfly nymph are extremely dark.
Wing pad: A protrusion from the thorax of an insect nymph which holds the developing wings. Black wing pads usually indicate that the nymph is nearly ready to emerge into an adult.
)
. The ultimate coloration of the adult wing is not very apparent in most pupal wing pads (
The wing pads on this final instar Baetidae mayfly nymph are extremely dark.
The wing pads on this final instar Baetidae mayfly nymph are extremely dark.
Wing pad: A protrusion from the thorax of an insect nymph which holds the developing wings. Black wing pads usually indicate that the nymph is nearly ready to emerge into an adult.
)
as the majority of the adult wing coloration comes from the color/position of the adult wing hairs and setae (Seta: Little hairs on insects.). But dark pupal wingpads are a good indication that the emergence will occur very soon, likely that day or so, and that the adult parts are sufficiently developed within the pupae to make a species determination from the specimen, particularly if it is a male.
Collected May 13, 2007 from the Delaware River in New York
Added to Troutnut.com by Troutnut on May 18, 2007
Hydropsyche californica (Spotted Sedge) Caddisfly LarvaHydropsyche californica (Spotted Sedge) Caddisfly Larva View 5 PicturesSize - 14 mm

Condition - preserved

Habitat - cobble bottom, moderate flow run, at a depth of approx. 1 1/2 feet.

Key Characters - pair of large prosternal sclerites (Sclerite: A hard plate of chitinous material, such as those that form the exoskeletons of arthropods, uninterrupted by cracks or sutures.)


This is a very common taxon at this location. I collected using a kick net. In life, it is bright olive green ventrally, shading to a dull olive at its dorsal (Dorsal: Top.) abdominal surfaces. In the hand, the legs, thoraxic regions, and head appear medium chocolate brown. The stark contrast of the thoraxic plate's dark edges and light legs are effects of preserving. The plumouse anal hooks were duck down gray, not the color of the gills as appears in the preserved specimen.

The Lower Yuba River is a good habitat for this species, being a larger river with an open canopy. The Feather River just to the north of the Yuba system also finds H. californica in abundance. The other common Hydropsyche species in the area, Hydropsyche occidentalis, seems to prefer smaller, shaded streams.

Entoman
Collected March 9, 2011 from the Lower Yuba River in California
Added to Troutnut.com by Entoman on November 2, 2011
Specimen Page:12

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