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'Deep-sea spiders' that walk through the water
The Journal of Experimental Biology
|January 1, 1995
Summary
Deep-sea isopods (Munnopsidae) use unique leg movements for swimming, synchronizing diagonal limbs like terrestrial walkers. This suggests these crustaceans evolved walking before swimming.
Area of Science:
- Marine biology
- Crustacean locomotion
- Deep-sea ecology
Background:
- Munnopsidae isopods display diverse swimming behaviors.
- Previous research on crustacean locomotion has primarily focused on terrestrial or shallow-water species.
Purpose of the Study:
- To analyze the leg movement patterns during swimming in deep-sea isopods.
- To compare the swimming gaits of Munnopsidae with terrestrial locomotion.
Main Methods:
- Observational analysis of swimming behavior in Munnopsidae.
- Kinematic analysis of pereopod (P2-P7) movements during different swimming modes.
Main Results:
- Munnopsidae exhibit four swimming modes: forward striding, slow backward pedaling, fast backward pedaling, and escape.
- Forward and slow backward swimming involve asymmetric leg phasing.
- Limb coordination resembles terrestrial insect walking gaits, with diagonal limb synchrony (e.g., RP2LP3).
Conclusions:
- The observed leg coordination in Munnopsidae swimming is analogous to terrestrial alternating tripod gaits.
- This suggests a potential evolutionary pathway where walking preceded swimming in this group of deep-sea isopods.