Tags: adult male, anal pyramid, cerci, Cobra Clubtail dragonfly, epiproct, exuvia, gear talk, Gomphurus vastus, paraprocts, Potomac River, Riverbend Park 1 was taken using the same camera-flash combo. There were many exuviae clinging to the concrete retaining wall shown in the photo. The following photograph of another dragonfly exuvia was taken in-situ along the shoreline of the Potomac River using a Panasonic Lumix DMC-FZ150 superzoom bridge camera and Canon 580EX Speedlite, my go-to kit for photowalking. Adding the tele-extender results in a 1 f/stop loss of light additional backlight was added to the scene using a Nissin i40 external flash unit (off-camera, in SF mode).Īdobe Photoshop CC 2017 was used to annotate selected images. A Canon Extender EF 1.4x II was used for more magnification in Photo No. The following equipment was used to shoot all of the preceding photographs: Canon EOS 5D Mark II digital camera, in manual mode Canon EF100mm f/2.8L Macro lens (set for manual focus) plus a Kenko 20mm macro automatic extension tube Canon 580EX II external flash, off-camera, in manual mode Canon 580EX external flash, off-camera, in manual mode and a Yongnuo YN-622C-TX E-TTL II Wireless Flash Controller for Canon plus a two-pack of Yongnuo YN-622C II E-TTL Wireless Flash Transceivers for Canon.Ī Raynox DCR-250 close-up filter was used for Photo No. Like every good teacher, Sue doesn’t “give me a fish” - she teaches me how to fish. Sue patiently provides guidance regarding the scientific jargon that can make it either challenging (at best) or impossible to understand many dichotomous keys for the identification of odonate larvae/exuviae. “Gomphus complex” (= Gomphini) – Clubtails, Odonata Nymphs of Michigan.Įditor’s Note: Sincere thanks to Sue Gregoire, Kestrel Haven Migration Observatory, for her kind mentorship.21 Key to the species of the genus Anax, p. Identification Keys to Northeastern Anisoptera Larvae, compiled by Ken Soltesz. Key to the Genera of the Family Aeshnidae, p.Anatomy of a Dragonfly Larva, annotated illustration courtesy Jay Smith.Vimeo video: Identifying dragonfly larva to family (8:06).8 | Cobra Clubtail ( Gomphurus vastus) | exuvia (prementum) 1a – Strongly hooked palpal lobes with few teeth (3-5).15, Key to the species of the genus Gomphurus. Identification Keys to Northeastern Anisoptera Larvae, compiled by Ken Soltesz. Cobra Clubtail ( Gomphus vastus), p. Source Credit: Merriam-Webster Dictionary. As a result, the workflow for identifying this specimen was a little “jumpier” than usual.ĭichotomous key: a key for the identification of organisms based on a series of choices between alternative characters. Gomphidae is the second largest family of dragonflies, so it can be challenging to identify some specimens to the genus and species level.Ĭharacters from two dichotomous keys were used to identify the exuvia, in part, due to confusion caused by the fact that the name for the genus to which Cobra Clubtail belongs was changed recently from Gomphus to Gomphurus. (See a full-size version of the original photo, without annotation.) 3 | Cobra Clubtail ( Gomphurus vastus) | exuvia (face-head) Identification key for dragonflies of North AmericaNo. Males perch near riffles to wait for females. (Needham & Westfall, 1955 Westfall, 1974).Ĭomments: Rivers and streams with silty sand or rocky bottoms, adults forage in trees. Larva with long end hook on palp, long lateral spines on abdominal segment 9, and about 20 spinules o the lateral edges of segment 9. Female subgenital plate lobes bluntly rounded. The species is known from 25 counties within the states of Alabama, Arkansas, Florida, Louisiana, Mississippi, and Texas.Ĭomments: Larvae overwinter, flight season late April to late June.Ĭoloration and genitalia. Its natural habitat is rivers.Įndemic to the United States. Gomphus modestus is a species of dragonfly in family Gomphidae.
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