Anatomy and Biology of Mysella pedroana (Mollusca: Bivalvia: Galeommatoidea), and its Commensal Relationship with Blepharipoda occidentalis (Crustacea: Anomura: Albuneidae)

C. Boyko, P. Mikkelsen
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引用次数: 21

Abstract

Abstract The distribution, prevalence and abundance of the galeommatoidean bivalve, Mysella pedroana , on the spiny sand crab, Blepharipoda occidentalis , were studied based on newly collected material and museum specimens. Although sometimes free-living, M. pedroana occurs most often inside the branchial chamber of B. occidentalis , and appears to be a commensal associate. It is not known from outside the range of the host along the Pacific coast of California and Mexico. Approximately 60% of hosts examined contained typically 1—2 M . pedroana in their branchial chambers, but many more (maximum 22) were sometimes found. M . pedroana showed no preference for host sex, size, or branchial chamber (left vs. right) and were not more abundant in any part of the distributional range. No M . pedroana were found on specimens of the five taxa mostly closely related to B . occidentalis . M . pedroana is re-described and its systematic position discussed with special reference to difficulties of generic placement. Although the presence of the bivalves causes physical deterioration to the hosts' gill filaments, available evidence indicates that the relationship is commensal, rather than parasitic.
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足跖足(软体动物纲:双壳目:galeommato总科)的解剖生物学及其与西方足跖足(甲壳纲:异常目:白足科)的共生关系
摘要利用新采集的资料和博物馆标本,对带刺沙蟹(Blepharipoda occidentalis)上galeommatoidea双壳类Mysella pedroana的分布、流行度和丰度进行了研究。虽然有时是自由生活的,但M. pedroana最常发生在西方双歧杆菌的鳃腔内,似乎是一个共生的伙伴。在加利福尼亚和墨西哥太平洋沿岸的宿主范围之外,它是不为人所知的。大约60%的宿主通常含有1-2个M。在它们的鳃裂腔中有佩德罗娜,但有时发现更多(最多22个)。M。对寄主性别、大小或鳃室(左或右)没有偏好,在分布范围的任何部分都没有更丰富。不是M。在5个分类群的标本上均发现了与B亲缘关系最密切的pedroana。occidentalis。M。对Pedroana进行了重新描述,并对其系统位置进行了讨论,特别提到了通用定位的困难。尽管双壳类动物的存在会导致寄主鳃丝的生理退化,但现有证据表明,这种关系是共生的,而不是寄生的。
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