Assertion: crab's plate | /r/Synonym | book gills
Facets:
Source sentences:
text: Thin plates on the abdomen, called book gills, are used for breathing.
text: The opisthosoma bears a further six pairs of appendages; the first pair houses the genital pores, while the remaining five pairs are modified into flattened plates, known as book gills, that allow them to breathe underwater, and can also allow them to breathe on land for short periods of time, provided the gills remain moist.