Definition
Neosticta fraseri is a species of damselfly in the family Isostictidae. It is endemic to Australia and is part of the order Odonata, which comprises dragonflies and damselflies.
Overview
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Taxonomy:
- Kingdom: Animalia
- Phylum: Arthropoda
- Class: Insecta
- Order: Odonata
- Suborder: Zygoptera (damselflies)
- Family: Isostictidae
- Genus: Neosticta
- Species: Neosticta fraseri
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Distribution: The species is known only from eastern Australia, with confirmed records primarily from coastal and inland streams in Queensland and New South Wales.
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Habitat: N. fraseri inhabits flowing freshwater environments, particularly shady streams and creeks with overhanging vegetation. Adults are typically found perched on riparian foliage near water.
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Behaviour and Ecology: Like other damselflies, N. fraseri is a predator of small flying insects. Flight periods are generally during the warmer months (late spring to early autumn), coinciding with peak insect activity.
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Conservation Status: The International Union for Conservation of Nature (IUCN) has not evaluated Neosticta fraseri separately; however, its limited range makes it potentially susceptible to habitat degradation, water pollution, and changes in stream flow. No specific conservation measures are documented.
Etymology/Origin
The generic name Neosticta derives from Greek roots meaning “new” (neo‑) and “puncture” or “spot” (stiktos), a reference commonly used in damselfly taxonomy. The specific epithet fraseri is an eponym, likely honoring an individual with the surname Fraser—possibly a collector, naturalist, or entomologist associated with the species’ discovery. The exact person commemorated is not definitively recorded in accessible taxonomic literature.
Characteristics
- Size: Adult body length ranges from approximately 30–35 mm; wingspan is about 45–50 mm.
- Coloration: The thorax is generally dark metallic green to black with subtle pruinescence (a frosted appearance) developing in mature individuals. The abdomen is similarly dark, sometimes exhibiting faint pale markings on the terminal segments.
- Wings: Clear with a distinctive venation pattern typical of Isostictidae; the pterostigma (wing spot) is small and dark.
- Sexual Dimorphism: Males may show slightly more extensive pruinescence, especially on the abdomen, whereas females tend to retain a more uniformly dark coloration.
- Larvae: Aquatic nymphs are elongated, with gills adapted for respiration in flowing water; they are predatory, feeding on small aquatic invertebrates.
Accurate information is not confirmed for several morphological details (e.g., exact coloration patterns and measurements) because comprehensive descriptions are limited to a few taxonomic revisions and regional field guides.
Related Topics
- Isostictidae – The family of narrow-winged damselflies to which Neosticta fraseri belongs.
- Australian Odonata – The broader assemblage of dragonflies and damselflies native to Australia.
- Freshwater Insect Conservation – Issues concerning the preservation of aquatic habitats essential for species like N. fraseri.
- Damselfly Life Cycle – General information on the egg, nymph, and adult stages common to Zygoptera.
References for further reading:
- The Australian Faunal Directory (Department of Climate Change, Energy, the Environment and Water, Australia).
- “The Complete Field Guide to Dragonflies of Australia” (Günther Theischinger & John Hawking, 2006).
- Recent taxonomic revisions of the family Isostictidae published in Zootaxa and Journal of Insect Systematics.