Second Record of Pyura comma (Hartmeyer, 1906) from Sagami Bay and Adjacent Waters, Japan (Urochordata: Ascidiacea)

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  • 相模湾沖からのPyura comma(Hartmeyer, 1906)の再発見

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In the ascidian material collected during the project of "Study on Environmental Changes in the Sagami Sea and Adjacent Coastal Area with Time Serial Comparison of Fauna and Flora" in 2001-2003 by the National Science Museum, Tokyo, there are two small specimens referable to Pyura comma (Hartmeyer, 1906) of the family Pyuridae. This is only the second record in about a hundred years' blank since the holotype collected by Doflein in Sagami Bay. The specimens, dredged from slightly south of Sagami Bay at a depth between 133 m to 166 m, have a thick outer coat of sand entangled with crowded branches of tunic filaments, lined internally with a thin space traversed by basal portion of the filaments. The uninjured 16 mm long specimen has a ciliated groove as a longitudinal slit, the branchial sac composed of 8 (on the left) and 9 (on the right) folds, and one gonad on each side (the left being in the first intestinal loop), consisting of 9 (on the left) or 12 (on the right) capsules without any ligaments for their attaching to the mantle wall.

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