Palaemnema domina

Calvert, 1903

Desert Shadowdamsel

Palaemnema domina, commonly known as the desert shadowdamsel, is a in the Platystictidae. range from 35 to 44 mm in length with a wingspan of 38 to 48 mm. The species exhibits in coloration, with males showing brighter blue markings on abdominal segments 8 and 9 compared to females. It is active from July to September in riparian .

Palaemnema domina by the Smithsonian. Used under a CC0 license.Palaemnema domina by the Smithsonian. Used under a CC0 license.Palaemnema domina by iNaturalist user: desertharrier. Used under a CC BY-SA 4.0 license.

Pronunciation

How to pronounce Palaemnema domina: //pəˌlaɪmˈniːmə doʊˈmaɪnə//

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Identification

The combination of bicolored (dark brown above, dull yellow below), blue with black horizontal stripes including a broad stripe, and the specific pattern of blue and black on abdominal segments distinguishes this from other shadowdamsels. The enlarged blue segment 9 in females and blue segments 8–9 in males are key diagnostic features. Found in dense riparian vegetation rather than open water typical of many other .

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Habitat

Dense undergrowth alongside small, rocky streams in forested areas. congregate in dense vegetation and tangled roots of fallen sycamores and cottonwoods within a few feet of the ground and near streams during hot periods.

Distribution

Southeastern Arizona, Mexico, and Central America south to Nicaragua.

Seasonality

on the wing from July to September.

Life Cycle

Larvae live on gravelly beds of fast-flowing streams. Large nymphs climb onto mid-stream rocks to emerge at the end of the dry season. Females oviposit into stems of aquatic plants while males perch nearby.

Behavior

During heat of day, congregate in dense low vegetation near streams and perch with dangling, making them easily captured by hand. In morning, evening, and cool or rainy conditions, adults become active and frequently move in tandem pairs. Males appear to guard females during oviposition by perching nearby and presumably deterring other males.

Ecological Role

Aquatic as larvae, feeding on stream benthos. Terrestrial predator as , likely feeding on small flying insects.

Human Relevance

Subject of odonatological interest due to restricted range and specific requirements. No known economic importance.

Similar Taxa

  • Other Palaemnema speciesShare general shadowdamsel and forest stream , but differ in specific abdominal color patterns and details of thoracic striping
  • Other Platystictidae members share slender build and forest-associated habits, but P. domina distinguished by its specific color pattern and desert/riparian distribution

More Details

Activity patterns

Strongly influenced by temperature and time of day; activity shifts from sedentary perching during midday heat to active movement during cooler periods

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Sources and further reading