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53.3 MB (4.2 MB compressed)
5232 x 3564 pixels
44.2 x 30.2 cm ⏐ 17.4 x 11.9 in (300dpi)
DR GEORGE GORNACZ / SCIENCE PHOTO LIBRARY DR GEORGE GORNACZ / SCIENCE PHOTO LIBRARY
Light bulb tunicates, Clavelina lepadiformis, a chordate from waters off Lundy Island, North Devon, U.K. They feed by cilary currents, have gill slits for gas exchange and a reduced nervous system. Blood vessels are not present in tunicates instead only a few blood channels. The tubular heart, situated on the ventral side posterior to the pharynx, contracts in a wave like manner; this has the effect of pumping blood through the body. When mature all tunicates are haemaphrodite, though the gonads mature at different times reducing the possibility of self-fertilization.
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