otorgan

The otorgan is a hypothetical multimodal sensory organ described in speculative biology as a paired structure located along the lateral trunk of certain aquatic-analogous vertebrates. It is proposed to detect mechanical vibrations, chemical cues, and rapid pressure changes, contributing to prey detection and predator avoidance.

Etymology and naming: The term otorgan combines the Greek/Latin prefix ot- related to hearing with organ, reflecting the proposed sensory function. The concept emerged in discussions of convergent evolution and sensory diversification in aquatic-adapted lineages.

Anatomy and physiology: In the proposed model, each otorgan consists of a curved capsule housing a lamellar sensory crust and a network of sensory neurons interfacing with a dedicated brain region analogous to the vestibular or proprioceptive centers. It interfaces via afferent nerves to process multimodal input.

Development and function: Otorgans are hypothesized to differentiate from placodes during larval development, influenced by vibro-chemical environments. They aid in detecting prey-generated vibrations, navigating murky waters, and conveying social signals when visual information is limited.

Evolution and reception: As a speculative trait, otorgans are described within a hypothetical clade Otogari of amphibian-like vertebrates. While drawing parallels with the lateral line system in fish, the idea remains controversial and unsupported by confirmed fossil evidence in real organisms.