The Asian Pacific spionid polychaete worm Pseudopolydora paucibranchiata (Okuda, 1937) has been repeatedly reported from the Arabian Gulf and the Arabian Sea. Our recent molecular study showed that the Pacific and the Arabian populations of these worms are not conspecific. Here we describe adult, gamete, and larval morphology of worms from the Arabian Gulf, Kuwait, as the new species Pseudopolydora arabica sp. nov. Adults are characterized by the presence of intense yellow pigment on the prostomium, the dorsal side of the anterior chaetigers, and up to 50 ramified yellow chromatophores on each palp. Males produce thread-like wavy spermatophores about 10 μm in diameter and up to 2 mm long. Females store sperm in seminal receptacles on the dorsal side of fertile chaetigers and lay up to 1500 eggs into 35 capsules joined to each other in a string; each is attached by one stalk to the inner wall of the tube. Eggs are 100−103 μm in diameter, with smooth and thin envelopes, which develop into 3-chaetiger larvae inside the capsules. Hatched larvae are planktotrophic and settle and metamorphose at about 17 chaetigers. Adults inhabit silty tubes in soft sediments forming aggregations of up to 50,000 individuals per 1 m².

从阿拉伯湾和阿拉伯海中多次报告了亚洲太平洋假性多毛cha蠕虫Pseudopolydora paucibranchiata（Okuda，1937）。我们最近的分子研究表明，这些蠕虫的太平洋和阿拉伯种群不是同种的。在这里，我们将来自科威特阿拉伯湾的蠕虫的成虫，配子和幼虫形态描述为新种阿拉伯假单胞菌sp。十一月 成虫的特征是在前tom，前，背侧上存在强烈的黄色颜料，每只手掌上最多有50个分支的黄色色谱。雄性产生线状波浪状的精原细胞，直径约10μm，最长2 mm。雌性将精子储存在肥沃的小山羊背侧的精囊中，将多达1500个卵放入35个胶囊中，成串并串在一起。每个都通过一根柄连接到管子的内壁。卵的直径为100-103μm，有光滑而薄的被膜，在被膜内发育成3壳幼虫。孵化的幼虫是浮游性的，在约17只美洲虎中定居并变态。成人居住在软质沉积物中的粉砂管中，形成聚集体，每1 m ²多达50,000个人。