Ellipsoptera marginata
(Fabricius, 1775)
margined tiger beetle
Ellipsoptera marginata is a coastal tiger beetle in the , distributed along the Atlantic seaboard from Maine to the Gulf Coast of Florida, with additional Caribbean records. It inhabits salt marshes, coastal beaches, and mudflats with saline, sparsely vegetated substrates. The species is distinguished from its E. hamata by specific sexual characters: males possess a distinct tooth on the underside of the right , and females have elytral apices bent downward at a 90° angle. Where their ranges overlap on Florida's Gulf Coast, these characters are necessary for reliable identification.
Pronunciation
How to pronounce Ellipsoptera marginata: /ɛˌlɪpsoʊˈtɛrə ˌmɑːrdʒɪˈneɪtə/
These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.
Identification
Males are identified by a distinct tooth on the underside of the right , visible upon close examination. Females are identified by elytral apices that are bent downward at approximately a 90° angle where they meet at the . Both sexes exhibit a diffuse, indistinct middle elytral maculation that distinguishes them from other Ellipsoptera . The pronotum typically shows a bronze cast. The species has relatively large and long legs compared to many other tiger beetles.
Habitat
Coastal salt marshes, intertidal mudflats, and beaches with moist, saline, nearly barren substrates. Found in areas with sparse vegetation including red mangrove (Rhizophora mangle) thickets and black mangrove (Avicennia germinans) woodlands adjacent to open ground. Requires high-quality coastal scrub and salt marsh with briney, moist exposures.
Distribution
Atlantic seaboard from Maine southward along the coast to the Gulf Coast of Florida. Caribbean records include the Bahamas and Cuba. The range overlaps with E. hamata lacerata along Florida's Gulf Coast from approximately the Tampa Bay area northward.
Behavior
Extremely wary and difficult to approach, with fast running and strong capabilities that aid escape from perceived threats. activity pattern. Often found in mixed with other coastal tiger beetle . densities can vary significantly relative to co-occurring at the same locality.
Human Relevance
Subject of interest to tiger collectors and photographers due to its restricted coastal and identification challenges. Serves as an for intact coastal salt marsh . The including E. marginata and E. hamata is frequently discussed in entomological circles regarding identification and the importance of voucher specimens.
Similar Taxa
- Ellipsoptera hamataCo-occurs along Florida's Gulf Coast and is virtually identical in general appearance; distinguished by males lacking the mandibular tooth and females lacking the bent elytral apices. Both share the diffuse middle elytral maculation. E. hamata typically shows an olive cast to the pronotum versus bronze in E. marginata.
- Ellipsoptera hamata lacerataThe Gulf Coast of E. hamata that directly overlaps with E. marginata in peninsular Florida; identification requires examination of the same sexual characters that separate the parent .