Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York

Blue-winged Olives
Baetis

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Looking across Island Lake toward the Titcomb Basin—one of the popular crown jewels of the Wind River Mountains

From Island Lake in Wyoming

Stream photos

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Holocentropus Caddisfly Larva Holocentropus Caddisfly Larva

Dorsal view of a Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington

This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.

11 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.

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Polycentropus (Brown Checkered Summer Sedge) Caddisfly Larva Pictures

Polycentropus (Polycentropodidae) (Brown Checkered Summer Sedge) Caddisfly Larva from the Delaware River in New York

Lateral view of a Polycentropus (Polycentropodidae) (Brown Checkered Summer Sedge) Caddisfly Larva from the Delaware River in New York

Dorsal view of a Polycentropus (Polycentropodidae) (Brown Checkered Summer Sedge) Caddisfly Larva from the Delaware River in New York

Ruler view of a Polycentropus (Polycentropodidae) (Brown Checkered Summer Sedge) Caddisfly Larva from the Delaware River in New York The smallest ruler marks are 1 mm.

This caddisfly was collected from the Delaware River in New York on May 13th, 2007 and added to Troutnut.com by Troutnut on May 18th, 2007.

Discussions of this Larva

polycentropus

1 replies

Posted by Litobrancha on May 19, 2007

Last reply on Dec 22, 2007 by Creno

probably polycentropus, like earlfisherman said a good closeup of the anal claws would be helpful. esp any teeth or serrations on said claws. nice pics.

Polycentropodidae

Posted by Earlfishman on May 19, 2007

Last reply on May 19, 2007 by Earlfishman

Based on the head pattern, this larvae might be Polycentropus sp. or Neureclipsis sp., I find myself leaning towards the former but I've been wrong before. It's hard to tell for sure without close up photos of anal claws and legs. You can tell it isn't a Rhyacophilid because there isn't a sclerite on top of ab seg number 9.

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