Sea robins use leg-like fins to taste, navigate seafloor, researchers discover

Researchers have discovered that sea robins, a type of bottom-dwelling fish, utilize their leg-like fins for both navigation and sensory perception on the seafloor. These fins, which are extensions of their pectoral fins, allow sea robins to scurry, dig, and locate prey such as buried mussels. A study initiated by Corey Allard at Harvard University, in collaboration with Stanford researchers, has provided insights into the genetic and developmental biology of these unique appendages. The research revealed that the fins are sensitive to mechanical and chemical stimuli, confirming their role as sensory organs. The team identified two species of sea robins: Prionotus carolinus, which uses its legs for digging, and P. evolans, which lacks these sensory capabilities. The digging species has shovel-shaped legs with papillae, akin to taste buds, while the non-digging species has rod-shaped legs without papillae. This study not only enhances understanding of sea robins' adaptations but also offers a model for exploring evolutionary changes, potentially shedding light on the evolution of bipedalism in humans. The findings were published in two papers in Current Biology, detailing the sensory functions and genetic underpinnings of these adaptations.

- Sea robins use leg-like fins for navigation and sensory perception on the seafloor.

- The fins are extensions of pectoral fins and are sensitive to mechanical and chemical stimuli.

- Two species were studied: one that digs for prey and another that does not.

- The research provides insights into evolutionary adaptations and potential parallels to human bipedalism.

- Findings were published in Current Biology, contributing to the understanding of sensory biology in marine animals.