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首页> 外文期刊>Proceedings of the Biological Society of Washington >Account of Ophionereis diabloensis, a new species of brittle star, and of O. amphilogus, with information on their brooding reproduction and distribution (Echinodermata: Ophiuroidea: Ophionereididae)
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Account of Ophionereis diabloensis, a new species of brittle star, and of O. amphilogus, with information on their brooding reproduction and distribution (Echinodermata: Ophiuroidea: Ophionereididae)

机译：说明了脆性星的一种新物种-暗斑O蛇（Ophionereis diabloensis），以及两栖O蛇（O. amphilogus），以及它们的育雏繁殖和分布信息（棘皮derma：蛇皮纲：蛇皮纲）

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The present report on Ophionereis diabloensis, new species, and Ophionereis (= Ophiodesmus) amphilogus, doubles the number of Ophionereis species known from California waters and the number of brooding species known in the genus Ophionereis. Ophionereis diabloensis reaches at least 6 mm in disk diameter, with arms 17 mm in length. It is similar in appearance to O. amphilogus but for its more irregularly arranged and exposed disk scales, more robust arms and thick, truncate arm spines, larger accessory dorsal arm plates, and distinctively shaped oral shields. The description of O. diabloensis is based on material from Diablo Cove, California, the only locality where the species is presently found. Evidence is presented, however, that individuals of O. diabloensis, mistakenly identified as Ophionereis eurybrachiplax, formerly occurred at Pacific Grove, California. Ophionereis amphilogus is reported from the Baja California coast and from the California Channel Islands, extending the known range of the species by approximately 800 km. Most specimens of O. amphilogus, and many of O. diabloensis were brooding embryos. Individuals of O. diabloensis contained up to 8 embryos, at different stages of development and had no more than one embryo per bursa. The largest embryos, 1.4 mm disk diameter, with approximately 15 arm joints, were similar in size to the smallest free-living individuals collected in the field. Both species are slow moving. Ophionereis diabloensis lives in algal turf in the intertidal zone, and may be locally abundant, with a population density estimated at 20/m2. Ophionereis amphilogus is found subtidally in kelp holdfasts. That two of the four Californian species of Ophionereis have been overlooked and are so little known, is illustrative of the general lack of study and of rigorous, systematic surveys of Eastern Pacific echinoderms.
机译：本报告有关暗斑蛇眼鱼类，新物种和两栖蛇耳鱼类（Ophionereis），使从加利福尼亚水域获知的蛇眼鱼类数量增加了一倍，而在蛇眼藻属中繁殖的育卵物种数量也翻了一番。 Ophionereis diabloensis的盘直径至少达到6 mm，臂长为17 mm。它在外观上与两栖兽相似，但盘状鳞片排列不规则且暴露在外，臂更健壮，臂棘粗而截短，背侧臂板较大，形状独特。 O. diabloensis的描述基于加利福尼亚州Diablo Cove的材料，这是目前唯一发现该物种的地方。但是，有证据表明，错误地标识为Ophionereis eurybrachiplax的O. diabloensis个体以前发生在加利福尼亚的Pacific Grove。据报道，来自美国下加利福尼亚州海岸和加利福尼亚海峡群岛的Ophionereis amphilogus使该物种的已知范围扩大了约800公里。两栖O.的大部分标本，以及许多O. diabloensis是育雏的胚胎。暗黑麦草的个体在不同的发育阶段包含多达8个胚胎，每个囊囊中的胚胎不超过一个。最大的胚盘直径为1.4 mm，具有大约15个手臂关节，大小与田间采集的最小的自由活动个体相似。这两个物种都在缓慢移动。 Ophionereis diabloensis生活在潮间带的藻类草皮中，可能局部丰富，种群密度估计为20 / m2。 Ophionereis amphilogus在海带保持器中很好地发现。加州蛇嘴兽的四个物种中的两个已经被忽略并且鲜为人知，这说明普遍缺乏研究并对东太平洋棘皮动物进行了严格而系统的调查。

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