Which trait is characteristic of Sisyridae larvae?

Which trait is characteristic of Sisyridae larvae?

• A. They are fully aquatic.
• B. They are terrestrial detritivores.
• C. They are arboreal predators on land insects.
• D. They are parasitic in aquatic hosts.

Answer: (A)

Sisyridae larvae are fully aquatic in their larval stage. In freshwater habitats—streams and ponds—they live underwater and rely on aquatic respiration, often scraping or preying on aquatic invertebrates, with a specialization for feeding on freshwater sponges. This makes them distinct from terrestrial detritivores, arboreal land predators, or parasites that require a living host. Their life cycle includes a water-bound larval period that ends with a metamorphosis to a winged adult, so the aquatic nature of the larval stage is the defining trait.

Sisyridae larvae are fully aquatic in their larval stage. In freshwater habitats—streams and ponds—they live underwater and rely on aquatic respiration, often scraping or preying on aquatic invertebrates, with a specialization for feeding on freshwater sponges. This makes them distinct from terrestrial detritivores, arboreal land predators, or parasites that require a living host. Their life cycle includes a water-bound larval period that ends with a metamorphosis to a winged adult, so the aquatic nature of the larval stage is the defining trait.