Brittle Bladderfern vs Coastal Flat-body

Cystopteris tenuis compared with Agonopterix yeatiana

Key Differences

• Brittle Bladderfern is Not Evaluated while Coastal Flat-body is Near Threatened.

Taxonomic Classification

Rank	Brittle Bladderfern	Coastal Flat-body
Kingdom	Plantae (식물)	Animalia (동물)
Phylum	Tracheophyta	Arthropoda (절지동물)
Class	Polypodiopsida (고사리강)	Insecta (곤충)
Order	Polypodiales (고사리목)	Lepidoptera (나비목)
Family	Cystopteridaceae	Depressariidae
Genus	Cystopteris	Agonopterix
Species	Cystopteris tenuis	Agonopterix yeatiana

Conservation Status

Brittle Bladderfern

NE — Not Evaluated

Coastal Flat-body

NT — Near Threatened

Physical Characteristics

Attribute	Brittle Bladderfern	Coastal Flat-body
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Brittle Bladderfern

Habitat

Typically found in moist, shaded forest floors and tropical canopies.

Range

Distributed across Canada and United States.

Coastal Flat-body

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, and Sweden. Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Brittle Bladderfern

The Brittle Bladderfern (Cystopteris tenuis) is a species in the genus Cystopteris. Typically found in moist, shaded forest floors and tropical canopies.

Coastal Flat-body

Agonopterix yeatiana, the coastal flat-body, is a small moth in the family Depressariidae native to coastal and calcareous grassland habitats across western and northern Europe, with records from Belgium, Denmark, and Sweden. Moths in the family Depressariidae, commonly called flat-body moths due to the depressed posture they adopt when resting with wings held flat against the surface, are associated predominantly with umbellifer plants of the family Apiaceae as larval hosts. Agonopterix yeatiana larvae feed on wild carrot (Daucus carota), wild parsnip (Pastinaca sativa), and related coastal and grassland Apiaceae species, inhabiting the open, often calcareous or sandy habitats where these plants grow. Adult moths have greyish-brown forewing with a distinctive pattern of spots and dashes and reach approximately 8–12 millimeters in wingspan. The species is classified as Near Threatened by the IUCN, reflecting declines associated with the loss of traditional hay meadow management, coastal grassland degradation, and scrub encroachment that eliminates the open, flower-rich grassland habitats supporting its host plants. Agricultural intensification has reduced wild umbellifer populations significantly across lowland Europe, reducing food resources for larvae of specialist moths like A. yeatiana.