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Erythrodiplax umbrata

Erythrodiplax umbrata


Family: Libellulidae
Order: Odonata
Class: Insecta
Phylum / Division: Arthropoda
Kingdom: Animalia

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Records from Parque Nacional El Palmar


Description


Possesses a total body length ranging from 38 to 45 millimeters, displaying highly pronounced sexual and ontogenetic dimorphism that makes the identification of immature individuals challenging for the untrained eye. Mature adult males exhibit an almost entirely blue-black body, which is covered by a dense, wax-like pruinosity on both the thorax and the abdomen, giving them a matte, velvety appearance. Their most distinctive morphological feature is the presence of a conspicuous dark brown or black transverse band across the middle of all four of their otherwise transparent wings. Females, on the other hand, are highly polymorphic; some present a wing pattern similar to that of mature males (andromorphic forms), while others lack these dark bands entirely or show only faint smoky patches at the wing tips (heteromorphic forms). The abdomen of females and immature males is predominantly decorated in ochre, brown, or yellowish tones, featuring a black mid-dorsal stripe running longitudinally through the abdominal segments. The large compound eyes meet at the midline of the head and acquire a dark reddish-brown coloration upon maturity.

Geographical distribution: Spans a remarkably vast range across the Americas, originating from the southern reaches of the United States (with stable and dense populations in states such as Texas and Florida, along with occasional vagrancy records in more northern states) and extending southward through all of Mexico, Central America, and the islands of the Caribbean. In South America, its presence is well-documented in almost every country, including Colombia, Venezuela, Brazil, Ecuador, Peru, Bolivia, and Paraguay, reaching its southernmost distributional limit in the temperate provinces of Argentina and across most of Uruguay. This enormous geographic dispersion demonstrates an outstanding capacity for transboundary colonization and adaptation to diverse continental and insular climatic regimes.

Habitat: Occurs predominantly in lentic aquatic ecosystems, showcasing a strong affinity for both permanent and ephemeral water bodies located in open, sunny, and low-altitude areas. It is highly common to find this species colonizing temporary ponds, flooded pastures, marshes, shallow lagoons, agricultural drainage ditches, and the margins of artificial reservoirs. It possesses an astonishing tolerance for anthropogenic and highly disturbed environments, often benefiting from deforestation and the creation of artificial watering holes for livestock. It is rarely associated with dense forests or fast-flowing rivers, as the nymphs require calm waters with abundant submerged or floating aquatic vegetation, which they utilize as refuge from larger predators and as hunting platforms.

Feeding: Functions as a highly efficient and opportunistic predator during all active stages of its life cycle. In its adult stage, it is a highly agile aerial hunter that captures a wide variety of small flying insects on the wing. Its diet consists primarily of dipterans (mosquitoes, flies), microlepidopterans (small moths), homopterans, and even smaller odonates. To capture its prey, it utilizes a sit-and-wait strategy from strategic perches, launching rapid, precise flights to seize the victim with its spine-bearing legs. In its aquatic nymph or naiad stage, it is a voracious ambush predator that utilizes a modified, extensible lower lip (labium) to capture mosquito larvae, small crustaceans (such as cladocerans and copepods), oligochaetes, and even small frog tadpoles or tiny fish fry.

Behavior: Exhibits diurnal activity patterns that are strictly dependent on high solar radiation. Mature males are highly territorial and aggressive, establishing watchposts on dry twigs, grass tips, or rocks near the water´s edge, from which they make frequent patrolling flights to expel conspecific rivals or other dragonfly species. It features a sophisticated thermoregulatory mechanism known as the obelisk posture, in which it raises its abdomen vertically, pointing it toward the sun during the hottest hours of the day; this behavior minimizes the body surface area exposed to direct solar radiation, preventing thermal overheating. Its flights are typically short but extremely fast and erratic, consistently returning to the same favored perches.

Reproduction: Initiates its reproductive cycle strictly within lentic aquatic environments. The process begins when a mature male intercepts a receptive female in mid-air, quickly coupling to form the characteristic copulatory wheel or tandem posture, which can last from a few seconds to several minutes, usually taking place while perched on riparian vegetation. Following fertilization, the female performs exophytic oviposition, flying low over the water surface and repeatedly tapping it with the tip of her abdomen to release her eggs, which sink and adhere to submerged vegetation or muddy substrates. During this process, the male typically performs non-contact guarding, hovering close to her to deter other males from disrupting the oviposition. The aquatic nymphs develop through several growth stages (instars) before climbing up emergent vegetation to undergo their final metamorphosis and emerge as winged adults.

Conservation status: Is categorized as Least Concern (LC) on the IUCN Red List of Threatened Species. This conservation status is due to its extremely vast geographic distribution, its dense and stable populations, and its outstanding ability to thrive in habitats modified by human activities. There are no major, large-scale threats endangering the global survival of this taxon, as its ecological adaptability to temporary and artificial wetlands easily offsets any localized loss or degradation of natural aquatic ecosystems within the Neotropical region.



Compilation and publication: EcoRegistros – 20/09/2026




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Page 1
Record IDDateExact timeCountryProvince / departmentPlaceFilmedPhotographedRecorded vocalObservedHeardWounded or deadNumber of individualsUser or BibliographyDetail
64758625/11/2017ArgentinaEntre RíosParque Nacional El PalmarLuis Emilio Lorenzo
18632629/12/2012ArgentinaEntre RíosParque Nacional El PalmarEdith Polverini
6268015/12/2012ArgentinaEntre RíosParque Nacional El PalmarRosana Ursino
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Please use the following reference when citing this species account.
EcoRegistros. 2026. Erythrodiplax umbrata – Species account. Accessed from www.ecoregistros.org on 22/09/2026.