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海洋蔓足类在宿主体上常有固定的定着位置。同一个种在不同宿主体上的定着位置亦不相同。龟藤壶是以蔓足朝向宿主前进寸水流流过宿主体表的方向定向(0~°方式)的;薄壳龟藤壶在蟹体上,均以蔓足背向口器形成的水流进行定向;三角藤壶在贻贝壳上以±180°方式定向;薄壳星藤壶和高峰星藤壶在宿主体上以0—±180°方式定向;细板条茗荷在海蛇体上以0—±90°方向定向。在单向流向的码头,鳞笠藤壶、高峰星藤壶以蔓足朝向潮流影响较大的方向定向;在双向流向的海区,鳞笠藤壶、纹藤壶和白脊藤壶以峰板朝上、吻板朝下,与波轴呈约直角方向定向。在开敞性海岸,日本笠藤壶以峰板朝下、吻板朝向波浪冲散后水流下落的方向定向;龟足则在岩缝间以同样方式定向。海洋蔓足类具有对各种形式的水流产生反应的定向机制,据此,可为水文学家和古地理学家提供生物学的依据。
Marine clam class often fixed in the host body fixed position. The same species in different host body set the location is not the same. The turtle barnacle is orientated in the direction of the host body surface (0 ° °) with respect to the direction of water flow through the body surface of the host; Orientated; triangular barnacles orientated at ± 180 ° on the mussel shell; thin-shelled star barnacles and peaked spiny barnacles oriented at 0- ± 180 ° on the host body; ± 90 ° direction orientation. In the one-way flow of the terminal, the barbarian barnacle barnacle, the peak of the barnacle sparrow toward the direction of the trend toward the larger trend; in two-way flow of sea area, barnacle barnacle, Up, kiss down, with the wave axis is oriented at a right angle. On the open coast, the Japanese barnacle falls down with its peak facing downwards, and the kiss plate is oriented toward the whereabouts of the current as the wave decays; the turtle foot is oriented in the same way between the rock crevices. Marine metacarpids have a directional mechanism that responds to various forms of water flow, thus providing biologists with hydrologists and palaeogeographers.