Abstract

A new infaunal pinnotherid crab, Pinnixulala heardin. sp., is described from muddy substrates of the middle to inner continental shelf of the northern Gulf of Mexico. Molecular genetic analysis supports its separation from P. retinens (Rathbun, 1918), the only other western Atlantic member of the genus and a species most commonly found living as a symbiont of large polychaete worms. Both western Atlantic species are clearly separated from several described and undescribed populations of congeners occurring along shorelines of the eastern Pacific. We herein include a rediagnosis of P. retinens to facilitate morphological comparisons with P. heardin. sp. Unlike P. retinens, which is more common in shallow inshore waters and reaches larger sizes, the new species lacks development of a strong distally directed spine on the fourth pereopod ischium and has chelae that are at least as heavily developed as the second and third pereopods. In addition, the mature male first gonopods in P. heardin. sp. are tapered over their terminal one-third and directed distally, rather than being curved in their terminal one-third with the tips directed mesially, as they are in P. retinens. The new species is invariably collected from samples including infaunal worms and other invertebrates, but the specific hosts remain to be determined

中文翻译：

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墨西哥湾北部不确定的寄主寄养的Pinnixulala Palacios Theil，Cuesta和Felder属的新Pinnotherid蟹，2016年重新诊断，并更新为多毛et共生体Pinnixulala retinens（Rathbun，1918）（Decapoda：Brachyura：Pinnotheridae） ）

摘要

一种新的臭名昭著的pinnotherid蟹，Pinnixulala月季蟹。sp。在墨西哥湾北部中陆大陆架的泥质基质中进行了描述。分子遗传学分析支持将其与视黄红球菌分离（Rathbun，1918年），后者是该属的唯一另一个西大西洋成员，并且是最常作为大型多毛cha蠕虫的共生体生活的物种。两种西大西洋物种都明显与东太平洋沿岸出现的几个同类的和未描述的同类物种群分开。我们在本文中包括视黄单胞菌的重新诊断，以促进与听疫杆菌的形态学比较。sp。与视黄杆菌不同，在较浅的近海水域中更常见，并达到较大的尺寸，新物种缺乏在第四Pereopod坐骨上形成向远侧强烈的脊柱，并具有至少与第二和第三Pereopod一样发达的螯。此外，在雄性假单胞菌中，成熟的雄性第一类足类。sp。圆锥形在其末端上变细三分之一并指向远侧，而不是在末端上弯曲成三分之一，其尖端向内定向，就像在视网膜假单胞菌中一样。新物种总是从包括不育蠕虫和其他无脊椎动物在内的样品中收集，但是具体宿主仍待确定