Ebony Jewelwing

Forget everything the forktails taught you about damselflies being tiny, drab, and hard to see. The ebony jewelwing (Calopteryx maculata) landed on a streamside fern with jet-black wings, a metallic green body that shifted between emerald and teal depending on the light angle, and a slow, butterfly-like flight that looked less aerodynamic and more choreographed. At two inches long with broad, dark wings held together above the body at rest, the ebony jewelwing sat the most visually striking damselfly in North Louisiana and the one most likely to stop a non-birder mid-step with "what was THAT." North Louisiana's clean, shaded streams and wooded creek corridors support ebony jewelwing populations from May through September wherever the canopy filtered the light and the water flowed clear over a rocky or sandy bottom. The jewelwing's habitat preference overlapped with the clubtails' clean-stream requirement but added a shade component the sun-loving clubtails avoided: jewelwings perched in the dappled light under the stream canopy where the temperature sat cooler, the humidity sat higher, and the visual effect of the metallic green body catching filtered sunlight through the leaves earned the damselfly every syllable of the "jewelwing" name. The Black Wings Both sexes wore entirely black wings (or very dark brown-black, depending on the light), and the solid dark wing color sat unique among North Louisiana's odonates. Every other dragonfly and damselfly in the 26 parishes wore clear wings, wings with small basal patches, or wings with subtle tinting. The ebony jewelwing wore opaque black wings that absorbed light rather than transmitting it, and the dark wings against the metallic green body created a contrast that no other odonate approached. Males' wings sat uniformly dark from base to tip. Females' wings showed a small white spot (the stigma) near the wing tip that the males did not carry, and the white stigma on otherwise dark wings sorted females from males at binocular distance during the perching posture. White spot equals female. No white spot equals male. The wing check took one second and worked at any distance where the stigma resolved against the dark wing. The broad wing shape (wider and more rounded than typical damselfly wings) gave the ebony jewelwing its butterfly-like flight profile. A forktail's narrow wings powered a quick, darting flight between grass blades. Broad jewelwing wings powered a slow, fluttering flight between fern fronds that looked deliberate and graceful rather than urgent and direct. A male ebony jewelwing flying along a Corney Creek stream corridor fluttered between sunbeams with a flight style that resembled a black butterfly more than it resembled a damselfly, and the butterfly impression fooled casual observers until the metallic green body and the folded-wing perching posture corrected the classification. The Metallic Green Body Metallic emerald-to-teal green covered the thorax and abdomen on males, and the color shifted between green and blue-green as the light angle changed. The shimmer came from structural color (light refraction in the exoskeleton) in the exoskeleton rather than by pigment. A male ebony jewelwing perched on a fern in direct sun showed emerald green. The same male in shade showed darker teal. The same male backlit by the sun showed near-black with green highlights. The color told the light angle rather than the identity, and the damselfly stayed the same while the light rotated through the day. Females wore a less intense metallic green that leaned more bronze or brown-green than the male's bright emerald, and the female's duller coloring blended into the streamside vegetation better than the male's saturated green advertised against it. A female ebony jewelwing on a brown fern frond over a shaded creek disappeared against the background that the male sat in front of glowing. The metallic quality earned more close-range admiration than any other damselfly in North Louisiana because the color shifted and shimmered with every angle change in a way that flat pigment colors (the forktails' yellow, the dancers' blue) did not. A jewelwing perched at arm's length on a streamside twig showed a different green from the left eye than from the right eye, and tilting the head shifted the color across the spectrum from emerald through teal to near-blue in a continuous gradient that the observer controlled by moving rather than by waiting for the damselfly to change. The Courtship Flutter Male ebony jewelwings performed a wing-flutter courtship display that no other North Louisiana damselfly attempted. A male that spotted an approaching female opened the dark wings wide, fluttered them slowly in an exaggerated display that showed the full wing surface from the front, and hovered in front of the female with the wings beating at a slower-than-flight cadence that turned the wing movement from locomotion into advertisement. The courtship flutter showed the wing quality (undamaged wings with full dark coloring indicated a healthy, young male) and the body quality (bright metallic green indicated good nutritional condition) simultaneously, and the female evaluated both before accepting or rejecting the male. A female that flew past a displaying male without stopping rejected the display. A female that landed on a stem near the displaying male accepted the initial approach, and the mating sequence progressed from there. Courtship happened over the stream, within the male's territory, and the female's approach through the male's patrol zone triggered the display automatically. A walk along a Winn Parish creek during June encountered displaying males at every sunny gap in the canopy where the light caught the wings and the body during the flutter, and the courtship displays added a behavioral spectacle to the visual spectacle the jewelwing's coloring already provided. Multiple males displaying simultaneously at a busy stream section created a competition that the female navigated by flying past each displaying male and landing near the male whose display (wing quality plus body brightness plus territory quality) impressed the most. A female ebony jewelwing at a Kisatchie creek choosing between three displaying males evaluated the males in under ten seconds and landed near the winner without returning to the losers, and the selection happened fast enough that the observer barely tracked the female's decision before the winner and the female moved into the mating sequence. Why the Shade Ebony jewelwings concentrated in shaded stream corridors rather than on open, sunny waterways because the shade gave the metallic structural coloring its maximum visual impact. Direct overhead sun washed out the metallic green and turned the body into a flat, undifferentiated color. Filtered sidelight through canopy gaps lit the metallic surface at the angles that triggered the color-shift effect, and the jewelwing's entire visual display (courtship flutter, territorial patrol, perch posture) evolved for the lighting conditions the shaded stream corridor provided. The shade preference also kept the jewelwing's body temperature lower than the sun-exposed dragonflies' temperatures at the same stream, and the lower operating temperature meant the jewelwing flew at a slower, more controlled pace that the direct-sun species' faster metabolisms did not permit. A blue dasher in full sun flew fast because the heated flight muscles powered fast flight. An ebony jewelwing in the shade flew slow because the cooler flight muscles powered the deliberate, fluttering flight the courtship display and the territorial patrol both used. The flight speed matched the habitat, and the habitat matched the display, and the entire behavioral package only worked in the dappled shade the shaded stream corridor delivered. A stream that lost its canopy to logging, clearing, or storm damage lost the shade, lost the lighting conditions, and lost the ebony jewelwings within one to two seasons as the sun-exposed stream attracted open-water dragonflies (blue dashers, pondhawks) that the jewelwings could not compete with in direct sun. Canopy restoration (letting the streamside trees regrow) brought the shade back within five to ten years, and the jewelwings recolonized from populations at still-shaded sections upstream or downstream. The jewelwing tracked the canopy the way the clubtail tracked the gravel: remove the habitat feature, lose the dragonfly. The Stream Territory Males defended linear territories along stream corridors, claiming sections of streambank ten to thirty feet long and patrolling the section with slow fluttering flights that showed the wings and the body to every approaching damselfly. The territory centered on a section of stream with good oviposition habitat (submerged vegetation or waterlogged wood where the female inserted eggs) and good perching habitat (fern fronds, low branches, and streamside vegetation in the dappled light the jewelwing preferred). Territory defense involved the fluttering display aimed at intruding males, followed by a slow aerial chase if the intruder did not leave. Two male ebony jewelwings in a territorial confrontation circled each other at head height over the stream in a slow, wings-spread display flight that looked more ceremonial than aggressive, and most confrontations resolved with one male fluttering away and the other returning to the territory without physical contact. The slow, visible confrontation style differed from the fast, violent dogfights the dragonflies staged at the same streams. Perching within the territory happened on horizontal surfaces in the dappled light zone: fern fronds, low overhanging branches, broad leaves, and any flat surface between one and four feet above the stream surface. A male ebony jewelwing on a Christmas fern frond over a shaded creek at eye level gave the observer a full view of the metallic green body, the black wings folded above the body, and the structural color shifting as the filtered sunlight moved through the canopy gaps. The perch view sat the best way to see the jewelwing because the slow flight between perches lasted seconds while the perch lasted minutes. The Jewelwing and the Birder Birders crossing over into odonate watching found the ebony jewelwing the most rewarding first-encounter damselfly in North Louisiana because the damselfly behaved the way birds behaved: displayed, defended territory, performed courtship rituals visible at binocular distance, and perched long enough for a satisfying look. A forktail perched for seconds and flew at shin height. A blue dasher perched and sallied too fast to track without practice. An ebony jewelwing perched on a fern frond at eye level for five minutes, fluttered between perches at walking speed, and displayed the courtship flutter in slow motion that the observer followed without binoculars from ten feet away. The jewelwing's behavioral pace matched the birder's observation pace in a way no other North Louisiana odonate matched, and the stream-corridor habitat (wooded, shaded, trail-accessible) resembled the birding habitat the birder already visited for warblers and flycatchers. A birder on a Kisatchie bottomland trail in June who paused at a creek crossing and watched the ebony jewelwings for ten minutes got the odonate gateway experience that no pond dragonfly delivered as cleanly. Photographing the ebony jewelwing gave the photographer a portrait subject that cooperated the way a perched bird cooperated: still enough for focus, close enough for detail, and colorful enough for a frame-worthy image without any post-processing. A phone camera at two feet captured the metallic green body, the black wings, and the structural color shift in enough detail that the photograph showed the viewer exactly why the photographer stopped at the creek. The Submerged Egg Layer Females oviposited by inserting eggs into submerged plant stems, waterlogged wood, and other soft organic material below the water surface. The ovipositing female climbed down a stem or a piece of wood into the stream, submerged the abdomen (and sometimes the entire body), and inserted eggs one at a time into the substrate with the ovipositor at the abdomen tip. Full submersion during oviposition put the female underwater for up to thirty minutes at some sites, and a female ebony jewelwing that disappeared below the surface of a Claiborne Parish creek climbed back above the waterline half an hour later with the oviposition completed and a thin layer of air trapped against the body that the damselfly used for breathing during the extended submersion. The air-layer breathing let the female stay submerged far longer than any quick-dipping dragonfly managed, and the extended underwater oviposition placed eggs deeper and more securely than the surface-tapping method every dragonfly used. Males sometimes guarded the ovipositing female by perching near the submersion point and chasing rival males that approached while the female sat underwater and defenseless. A male perched on a twig above a female's submersion point at a North Louisiana creek stood guard over an invisible female for fifteen minutes before the female climbed back above the surface, and the guard duty prevented rival males from grabbing the female as the female emerged. The Stream-Bottom Naiad Ebony jewelwing naiads lived in the leaf packs, root tangles, and submerged debris of clean, flowing streams, breathing through three large, conspicuous caudal lamellae (tail gills) that the jewelwing naiad wore wider and more leaf-shaped than any forktail naiad's lamellae. The large lamellae gave the naiad efficient oxygen exchange in the flowing water and powerful swimming strokes for escape from predators. Larval development lasted roughly one year in North Louisiana streams, and the naiad fed on small aquatic invertebrates throughout the development period. Water quality sensitivity matched the clubtails' clean-water requirement: clear, well-oxygenated, flowing water with healthy substrate supported the naiads, and silted, polluted, or stagnant water killed them. The ebony jewelwing's presence at a stream confirmed the same water-quality story every other clean-stream odonate confirmed. The naiad's concealment in leaf packs gave the naiad protection from fish that scanned the open water column, and a jewelwing naiad tucked inside a waterlogged leaf pack at the bottom of a Corney Creek riffle sat hidden from the bass cruising six inches overhead. The leaf-pack habitat also concentrated the naiad's prey (midge larvae, tiny CRAWFISH, mayfly nymphs) in the same decomposing-leaf environment the naiad occupied. The One-Year Wait Ebony jewelwing naiads spent roughly a year in the stream before emerging as adults, and the one-year larval period meant the naiad survived two seasonal transitions (fall and spring) and one full winter in the cold water before the following May's warming water triggered the emergence. A naiad that hatched from an egg inserted into a submerged stick in a Winn Parish creek in July grew through the fall, slowed during winter, resumed growing in March, and climbed a fern stem above the waterline one May morning to emerge as the metallic-green adult the creek would host for the next six weeks. The emergence concentrated along the same shaded stream sections the adults patrolled, and exuviae (shed larval skins) on fern fronds and stream-edge rocks in late May confirmed emergence activity at any site. The shells stayed on the vegetation for weeks and gave the observer physical evidence of the emergence the dawn timing prevented most people from witnessing. Adult lifespan in the field ran roughly four to six weeks, and the short adult window packed courtship, territory defense, mating, and oviposition into a compressed schedule that started the day the wings hardened and ended when the body wore out or a predator closed the account. A male that emerged in mid-May and died in late June lived six weeks as an adult after spending twelve months as a naiad, and the twelve-to-six ratio between preparation and performance matched every other dragonfly and damselfly's brutal arithmetic. What Hunts the Ebony Jewelwing Spiders caught ebony jewelwings in orb-weaver webs strung across stream gaps at head height, and the jewelwing's slow, fluttering flight through the stream corridor gave the web more contact time per encounter than the fast-flying dragonflies that punched through the same webs without sticking. A jewelwing that flew into an orb-weaver web at a stream crossing stuck on the broad wings before the body contacted the silk, and the wing area that made the flight beautiful made the web encounter fatal. Birds caught ebony jewelwings from streamside perches. Eastern phoebes, Acadian flycatchers, and Carolina wrens all snatched perching or flying jewelwings from the stream corridor, and the jewelwing's dark wings against the dappled-light background made the damselfly visible to visual predators scanning the shaded understory. Larger dragonflies cruising the stream corridor (common green darners, river cruisers) caught jewelwings in flight, and the jewelwing's slow flight speed gave the larger, faster dragonfly every advantage in the interception. Fish caught ebony jewelwing naiads in the stream, and bass, sunfish, and creek chubs picked naiads from the leaf packs throughout the one-year larval period. Stream Density and the Good Stretch Ebony jewelwing density at a good North Louisiana stream section ran high enough that a fifty-yard walk along the creek encountered ten to twenty males defending territories, plus females visiting for mating and oviposition, plus immature adults feeding in the streamside vegetation. The density concentrated along stream sections with the right combination of shade, water quality, substrate for oviposition, and streamside vegetation for perching, and the good sections attracted jewelwings at densities the poor sections (too sunny, too silted, too open) did not support. Reading the stream for jewelwing potential came down to three quick checks: canopy cover (shaded corridors attracted jewelwings, open sections did not), water clarity (clear flowing water supported them, muddy or stagnant water did not), and streamside vegetation (ferns, low branches, and broad-leafed plants at one to four feet above the water gave the perching habitat the jewelwing needed). A stream section that passed all three checks supported ebony jewelwings during the May-through-September flight season, and a section that failed any one of the three likely did not. The linear nature of the stream habitat meant ebony jewelwing populations existed as a string of occupied territories along the good sections of each creek, with gaps at the poor sections and clusters at the best sections. A mapped survey of jewelwing territories along a Corney Creek stretch showed twelve males packed into a two-hundred-yard section of ideal habitat, zero males along a hundred-yard section where the canopy thinned and the sun hit the water directly, and eight males along the next hundred-and-fifty-yard section where the canopy closed again. The map traced the shade the way a temperature map traced the heat. The Jewelwing After Rain Rain events at North Louisiana streams affected the ebony jewelwing differently than rain affected the pond dragonflies. A moderate rain grounded the jewelwings in the streamside vegetation (the same as every other odonate), but the rising stream level from the rain also altered the oviposition habitat by submerging the wood and vegetation the females used for egg insertion. A female that planned to oviposit on a half-submerged stick before the rain returned to the stick after the rain and found the stick fully submerged under two feet of current that the pre-rain water level did not reach. The stream level fluctuations meant the oviposition habitat shifted vertically with every rain event, and the females adjusted by finding new oviposition substrates at the new waterline rather than returning to the pre-rain sites. A female ebony jewelwing at a Kisatchie creek after a rain event oviposited on a piece of wood that sat above the waterline two days earlier and now sat at the perfect half-submerged position the rising water created. The rain rearranged the furniture, and the jewelwing used whatever the rearrangement put at the right height. Post-rain recovery at stream sites happened faster than at pond sites because the flowing water cleared the turbidity within hours while pond turbidity settled over days. A Claiborne Parish creek that ran muddy for four hours after a rain ran clear by the same afternoon, and the jewelwings resumed territorial patrols and courtship displays within an hour of the water clearing. The fast recovery time meant rain days at a clean stream cost the jewelwing maybe half a day of activity rather than the full day the pond odonates lost to rain-caused turbidity. Seasonal Arc Ebony jewelwings in North Louisiana flew from May through September, with peak adult activity in June and July when the longest days and the warmest stream temperatures combined to support maximum activity hours per day. May brought the first emerged adults to the shaded stream corridors. June built the population to peak density as the spring emergence wave crested. July maintained high numbers. August thinned the population as the oldest adults died, and September brought the last stragglers before the shortening days and cooling nights ended the adult flight season. The flight season overlapped with the peak canopy-cover season, which meant the jewelwing's adults flew during the months when the stream canopy sat densest and the shade sat deepest. A June stream corridor with full canopy gave the jewelwing maximum shade for the courtship display and the territorial patrol. A March stream corridor with bare canopy (before leaf-out) gave zero jewelwings because the adults had not emerged yet and the bare canopy would not have provided the shade the adults needed anyway. The shade season and the flight season matched by design. Where to Look Clean, shaded streams and wooded creek corridors from May through September. Corney Creek, Dugdemona River, Saline Bayou tributaries, Kisatchie National Forest creek crossings, and any North Louisiana stream with a wooded canopy and clear flowing water put ebony jewelwings within arm's reach from the stream bank. Look at the dappled-light zone: the spaces where filtered sunlight penetrated the canopy and lit the streamside ferns, the overhanging branches, and the low vegetation at one to four feet above the water. The metallic green body caught the filtered light and flashed in a way the flat-colored forktails and dancers did not, and the dark wings folded above the body gave the perched jewelwing a silhouette no other damselfly shared. Mid-morning through mid-afternoon on sunny days put the most jewelwings on display at stream corridors, and the courtship flutter peaked during the warmest hours when the males defended territories most actively. A slow walk along a clean creek in Winn or Claiborne Parish during a June afternoon encountered displaying males at every sunny gap in the canopy. Where to Learn More Dennis Paulson's Dragonflies and Damselflies of the East covers the ebony jewelwing's courtship display, the submerged oviposition behavior, and the structural coloring that made the metallic green shift with the light angle. OdonataCentral.org maintained records and photographs for the ebony jewelwing's Louisiana distribution. Experiencing This Damselfly: Accessibility Notes Ebony jewelwings make no sound human ears detect, but the damselfly's large size (for a damselfly), dark wings, and metallic green body made visual detection easier than any forktail at the same stream. The slow, fluttering flight caught the eye in the dappled light, and the contrast between the black wings and the green body registered at distances where smaller damselflies stayed invisible. For anyone with mobility limitations, stream banks in North Louisiana run uneven and sloped. Parish road bridges over clean, wooded creeks offered the best accessible vantage, and a bridge railing in Claiborne, Winn, or Natchitoches Parish during a sunny June afternoon put the observer above a stream corridor where ebony jewelwings perched on ferns and low branches within binocular range. The damselfly's preference for perching at one to four feet above the water put the jewelwing below bridge height, and binoculars aimed downward from the bridge rail caught the metallic flash on the shaded fern fronds without anyone needing to climb down the bank. Boardwalks at swamp and stream habitats (Black Bayou Lake NWR, D'Arbonne NWR) that crossed or paralleled clean flowing water put the observer at the jewelwing's perching height on a stable, level surface.

Accessibility

Ebony jewelwings make no sound human ears detect, but the damselfly's large size (for a damselfly), dark wings, and metallic green body made visual detection easier than any forktail at the same stream. The slow, fluttering flight caught the eye in the dappled light, and the contrast between the black wings and the green body registered at distances where smaller damselflies stayed invisible.

For anyone with mobility limitations, stream banks in North Louisiana run uneven and sloped.

Parish road bridges over clean, wooded creeks offered the best accessible vantage, and a bridge railing in Claiborne, Winn, or Natchitoches Parish during a sunny June afternoon put the observer above a stream corridor where ebony jewelwings perched on ferns and low branches within binocular range.

The damselfly's preference for perching at one to four feet above the water put the jewelwing below bridge height, and binoculars aimed downward from the bridge rail caught the metallic flash on the shaded fern fronds without anyone needing to climb down the bank. Boardwalks at swamp and stream habitats (Black Bayou Lake NWR, D'Arbonne NWR) that crossed or paralleled clean flowing water put the observer at the jewelwing's perching height on a stable, level surface.