Plateumaris frosti

(Schaeffer, 1925)

Frost's reed beetle

Plateumaris frosti is a of aquatic leaf beetle in the Donaciinae, commonly known as Frost's reed . It is distributed across North America with records from Canada (Alberta, British Columbia, Manitoba) and the United States. Like other members of the Plateumaris, it is associated with wetland and riparian . The species was described by C. Schaeffer in 1925.

Plateumaris frosti by (c) Christian Back, some rights reserved (CC BY), uploaded by Christian Back. Used under a CC-BY license.

Pronunciation

How to pronounce Plateumaris frosti: /plæˈtjuːˌmɑːrɪs ˈfrɒstiː/

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Habitat

Aquatic and semi-aquatic environments; associated with emergent vegetation in wetlands, marshes, and along shorelines of lakes and slow-moving waters. Members of the Plateumaris are typically found on aquatic plants, particularly sedges and rushes ( Cyperaceae and Juncaceae).

Distribution

North America. Documented from Canadian provinces: Alberta, British Columbia, and Manitoba. Also present in the United States. The has a transcontinental distribution across northern and western portions of the continent.

Diet

Larvae are aquatic and feed internally on submerged portions of aquatic plants, particularly roots and rhizomes. feed on leaves and stems of emergent aquatic vegetation.

Host Associations

Cyperaceae - larval food plantsedges; typical for
Juncaceae - larval food plantrushes; typical for

Life Cycle

Typical of aquatic leaf beetles in Donaciinae: laid on or near aquatic vegetation; larvae are aquatic, living in submerged plant tissues or in the substrate near roots; occurs in an air-filled cocoon attached to aquatic plants; are capable of and disperse to new .

Behavior

are active fliers and can be found on emergent vegetation during warm periods. When disturbed, they may drop into water and swim or dive to escape. They are capable of remaining submerged by carrying air bubbles beneath the .

Ecological Role

Herbivore in freshwater wetland ; contributes to nutrient cycling through consumption and processing of aquatic plant material. Serves as prey for aquatic and semi-aquatic including fish, birds, and other .

Similar Taxa

Plateumaris shoemakeriOverlapping distribution in North America; similar preferences and ; requires examination of male genitalia or other subtle characters for definitive separation
Plateumaris pusillaSympatric in parts of range; similar size and coloration; distinguished by details of pronotal and elytral
Donacia speciesRelated in same ; similar aquatic habits and appearance; Donacia typically has more pronounced metallic coloration and different antennal proportions

More Details

Taxonomic Note

The Plateumaris was historically treated as a subgenus of Donacia but is now recognized as a distinct genus based on morphological and molecular evidence. Plateumaris frosti is one of approximately 40 in the genus, most of which are Holarctic in distribution.

Conservation Status

Not formally assessed by IUCN. Wetland loss and degradation may pose threats to local , but the appears to maintain broad distribution across northern North America.