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Protula tubularia
"This solitary bristle worm is found in a white, calcareous tube and has a small, elongated body and grows up to 0.5cm in length. The body has up to 120 red orange posterior segments (seen in these photos), while the short and green anterior region has only eight segments. The head is reduced and has two gill lobes, each with 20-45 white or pinkish spiralled tentacles in two rows. It also has paired red blotches and numerous eyespots. Chaetae are present on all segments, except the first. The chaetae in the thoracic region are golden in colour and are long and slender with narrow wings. However, the ones in the posterior region are longer but lack the narrow wings." ~ http://wildlife-archipelago.gr/wordpress...
Gulf of Aqaba, Red Sea