new segments might be added to the rear end during growth in a polychaete worm.
new segments might be added to the rear end during growth in a polychaete worm.
where might new segments be added during growth in a polychaete worm?
rear end
some polychaetes exhibit remarkable reproductive strategies. some species in the genus "eunicie" reproduce by epitoky. for much of the year, these worms look like any other burrow-dwelling polychaete, but as the breeding season approaches, the worm undergoes a remarkable transformation as new, specialized segments begin to grow from its rear end until the worm can be clearly divided into two halves. the front half, the atoke, is asexual. the new rear half, responsible for breeding, is known as the epitoke. each of the epitoke segments is packed with eggs and sperm and features a single eyespot on its surface. the beginning of the last lunar quarter is the cue for these animals to breed, and the epitokes break free from the atokes and float to the surface. the eye spots sense when the epitoke reaches the surface and the segments from millions of worms burst, releasing their eggs and sperm into the water.
polychaete
the monterey bay aquarium research institute deploys a four kilometer depth rated remotely operated vehicle named in honor of ricketts's work, the rov "doc ricketts".









































section::::eponymous species.









































since 1930, over 16 species have been named after ricketts:









































bullet::::- "aclesia rickettsi" (sea slug)









































bullet::::- "catriona rickettsi" (sea slug)









































bullet::::- "hypsoblenniops rickettsi" (blenny)









































bullet::::- "longiprostatum rickettsi" (flatworm)









































bullet::::- "mysidium rickettsi" (opossum shrimp)









































bullet::::- "siphonides rickettsi" (peanut worm)









































bullet::::- "nephtys rickettsi (polychaete worm)









































bullet::::- "mesochaetopterus rickettsi" (polychaete worm)









































bullet::::- "polydoa rickettsi" (polychaete worm)









































bullet::::- "panoploea rickettsi" (sand flea)









































bullet::::- "pentactinia rickettsi" (sea anemone)









































bullet::::- "palythoa rickettsi (zoanthid)









































bullet::::- "isometridium rickettsi" (sea anemone)
ed ricketts