Bladder Fern vs Common Yellow Conch

Cystopteris fragilis compared with Agapeta hamana

Key Differences

• Bladder Fern is Not Evaluated while Common Yellow Conch is Least Concern.

Taxonomic Classification

Rank	Bladder Fern	Common Yellow Conch
Kingdom	Plantae (plantas)	Animalia (Animals)
Phylum	Tracheophyta	Arthropoda (artrópode)
Class	Polypodiopsida (Polypodiopsida)	Insecta (inseto)
Order	Polypodiales (Polypodiales)	Lepidoptera (Butterflies & Moths)
Family	Cystopteridaceae	Tortricidae
Genus	Cystopteris	Agapeta
Species	Cystopteris fragilis	Agapeta hamana

Conservation Status

Bladder Fern

NE — Not Evaluated

Common Yellow Conch

LC — Least Concern

Physical Characteristics

Attribute	Bladder Fern	Common Yellow Conch
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Bladder Fern

Habitat

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

Range

Widely distributed across Asia (Taiwan), Europe (6 countries), North America (Canada, United States), and South America (Colombia).

Common Yellow Conch

Habitat

Typically found in virtually all terrestrial and freshwater habitats.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

Bladder Fern

The Bladder Fern (Cystopteris fragilis) is a species in the genus Cystopteris. Typically found in moist, shaded forest floors and tropical canopies.

Common Yellow Conch

<em>Agapeta hamana</em>, the common yellow conch moth, is a small moth in the family Tortricidae. It is widely distributed across Europe and central Asia, ranging from Britain and Scandinavia eastward through much of the Palearctic region. The species inhabits dry grasslands, heathlands, chalk downlands, and scrubby habitats where its larval host plants are found. Adult moths display distinctive pale yellow to golden-yellow forewings with irregular brown or reddish-brown markings near the wingtip, forming a pattern that resembles the shell of a conch, lending the species its common name. The wingspan typically measures around 15–22 mm. Biological traits such as average adult lifespan, precise body weight, and detailed population data remain poorly documented in consolidated scientific literature. Larvae feed internally on the roots of thistles and knapweeds, particularly <em>Centaurea</em> and <em>Cirsium</em> species. Adults fly from June to August and are frequently attracted to light. <em>Agapeta hamana</em> has been investigated as a potential biological control agent for invasive knapweed species in North America, where it has been introduced experimentally. The species is assessed as Least Concern given its broad distribution and stable habitat associations.

Shared Countries

Both species can be found in 4 countries:

🇧🇪 Belgium 🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden