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... many species in the family Serpulidae) which construct permanent calcareous tubes on rocks, seaweeds, dock pilings, and ship bottoms. The individual tubes with hard walls of calcite-aragonite, ranging from 0.04 to 0.4 inch (1 millimeter to 1 centimeter) in diameter and from 0.16 to 4 inches (4 millimeters to 10 centimeters) in length, are firmly cemented to a hard ...

a green respiratory pigment that replaces hemoglobin in some polychaetes, specifically, the worms of the families Sabellidae, Serpulidae, Chlorhaemidae, and Ampharetidae. The blood of some of the worms contains both chlorocruorins and hemoglobins. Hemoglobins predominate in young individuals of the genus Serpula, while chlorocruorins predominate in the ...