Light Bulb Sea Squirt (Scientific name: Clavelina Lepadiformis) is a colonial sea squirt. The transparent tunic of the worm shows the yellow or white internal organs. This gives them the glow of a light bulb and hence they got their name. They are mostly found along the Norwegian Coast. Their colonies can also be seen in the Atlantic Ocean, the North Sea, the English Channel and in the Mediterranean Sea. They sit together with a loose binding at the base. They are cylindrical and have a 4cm long elongation. They grow in late winters and reproduce in summers.