Nereis
Nereis is a genus of polychaete worms in the family Nereididae. It comprises many species, most of which are marine. Nereis possess setae and parapodia for locomotion and gas exchange. They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor setae are for crawling, and are the bristles that are visible on the exterior of the Polychaeta. They are cylindrical in shape, found not only in sandy areas, and they are adapted to burrow. They often cling to seagrass (posidonia) or other grass on rocks and sometimes gather in large groups.
Species
KINGDOM
- KingdomAnimalia
- PhylumAnnelida
- ClassPolychaeta
- OrderPhyllodocida
- FamilyNereididae
Habitatmarine, brackish
沙蚕（學名：Nereis），俗称沙虫，在福州称作流蜞，是多毛纲叶须虫目沙蚕科的一種环节动物。常栖息于泥沙中，生殖季节或夜出觅食时能游泳。可作为鱼类、虾、蟹等动物的食饵。 目录 1 特征 2 分布及习性 3 用途 4 外部連結 特征 体长10公分左右。体形修长，呈圆柱形，两侧对称、后端尖。身体分节明显，体节两侧突出成具有刚毛的疣足用以行动。 分布及习性 中国的沙虫有80多种，广泛地分布在从渤海到南海的各种灘塗、浅海。它们隐藏在泥沙洞穴、石缝或海藻丛中，以小型蠕虫或沉积物等为食。 用途 沙蚕常被用作钓海鱼的饵料，另外，也可以成为人类的美食。 Nereis diversicolor 外部連結 这是一篇與环节动物门相關的小作品。你可以通过编辑或修订扩充其内容。 查 论 编 取自“https://zh.wikipedia.org/w/index.php?title=沙蠶屬&oldid=47768585” 分类：沙蠶屬 隐藏分类： 物种微格式条目 含有拉丁語的條目 全部小作品 环节动物小作品
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Article
4 sectionsContents
- Etymology
- Ecology
- Species
- References
Nereis is a genus of polychaete worms in the family Nereididae. It comprises many species, most of which are marine. Nereis possess setae and parapodia for locomotion and gas exchange. They may have two types of setae, which are found on the parapodia. Acicular setae provide support. Locomotor setae are for crawling, and are the bristles that are visible on the exterior of the Polychaeta. They are cylindrical in shape, found not only in sandy areas, and they are adapted to burrow. They often cling to seagrass (posidonia) or other grass on rocks and sometimes gather in large groups.
Nereis worms are commonly known as rag worms or clam worms. The body is long, slender, and dorso-ventrally flattened, reaching a length of 5-30 cm. The head consists of two parts: a roughly triangular anterior lobe—the prostomium—and a posterior ring-like portion—the peristomium. The latter bears four pairs of tentacular cirri, dorsally two pairs of eyes, and ventrally a pair of short two-jointed palps. Sometimes they are confused with myriapods.