Fluttra

Fluttra is a fictional taxon used in science fiction, worldbuilding, and speculative biology to describe a genus of bioluminescent, acoustically active marine invertebrates.

Etymology and taxonomy: The name fluttra combines "flute" with Latin-based zoological suffixes; in common depictions, Fluttra is placed in the fictional family Fluttridae and order Cephalorea. Descriptions vary, but most sources describe several species within the genus, e.g., Fluttra lumina and Fluttra resonans.

Physical characteristics: Fluttra are typically small to medium in size (roughly 5–15 cm). They have gelatinous, translucent bodies with paired oral or dorsal membranes that can vibrate to produce musical tones. They often display bioluminescent patterns that shift in response to sound and light.

Behavior and ecology: Fluttra inhabit nearshore kelp forests and rocky reefs in fictional temperate zones. They feed on microzooplankton filtered through their ciliary nets. Their sonic membranes emit harmonic calls that serve in mate attraction, territory defense, and navigation aid within the colony. They form loose aggregations during breeding seasons.

In culture and speculative science, Fluttra vocalizations are used as a naturalistic element for sonar calibration, underwater art, and music-inspired storytelling. Some sources attribute to fluttra a cultural significance as guardians of coastal spaces.