An unusual habitat for bivalves: rediscovery of the enigmatic commensal clam Sagamiscintilla thalassemicola (Habe, 1962) (Bivalvia: Galeommatoidea) from spoon worm’s spoon

An unusual habitat for bivalves: rediscovery of the enigmatic commensal clam Sagamiscintilla thalassemicola (Habe, 1962) (Bivalvia: Galeommatoidea) from spoon worm’s spoon
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双壳类的不寻常栖息地:从勺子虫的勺子中重新发现神秘的共生蛤 Sagamiscintilla thalassemicola(Habe,1962)(双壳纲:Galeommatoidea)

DOI:
10.1007/s12526-018-0897-2
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发表时间:
2018
影响因子:
1.6
通讯作者:
Hiroshi Ishikawa
Hiroshi Ishikawa
中科院分区:
环境科学与生态学3区
文献类型:
--
作者:
Ryutaro Goto;Hiroshi Ishikawa

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海栖蛤(学名:Sagamiscintilla thalassemicola,双壳纲:Galeommatoidea:Galeommatidae sensulato)是一种生活在匙形蠕虫(环节动物:Echiura)体表的白色僧帽蛤。本种于1962年在日本九州的阿马库萨采集到的匙形蠕虫Anelalehynchus mucosus(海鲶科)的标本中被描述,但自第一次描述以来没有可靠的记录。因此,一些研究人员怀疑该物种可能已经灭绝。在这项研究中,我们从echiuranAneleumhynchussp的匙形喙中重新发现了这个物种。在日本的四国和九州岛。虽然最初的描述没有提到它的宿主使用模式的细节,但我们发现这个物种几乎只生活在宿主的喙沟内,在那里它几乎是隐藏在外面的。这种神秘的栖息地可能是该物种50多年来未被发现的原因。生活隐藏在主机的长鼻可能提供了一个抗捕食的好处。海洋生菌。宿主Echiurans在长鼻沟上产生纤毛水流,将食物颗粒输送到口中,双壳类可以利用这些水流进行呼吸和滤食。Sagamiscinitlla thalassemicolais在外生盔状幼体中的独特之处在于有一个完全覆盖壳瓣的外套膜。这可能是一种形态上的适应,以保护壳瓣免受通过宿主的喙沟转移的沙子和其他硬颗粒的影响。
Sagamiscintilla thalassemicola(Bivalvia: Galeommatoidea: Galeommatidae sensulato) is a white-robed commensal clam that lives on the body surface of spoon worms (Annelida: Echiura). This species was described based on specimens collected from the spoon wormAnelassorhynchus mucosus(Thalassematidae) in Amakusa, Kyushu, Japan, in 1962, but there has been no reliable record since the first description. Thus, some researchers suspected that this species may have become extinct. In this study, we rediscovered this species from the spoon-shaped proboscis of the echiuranAnelassorhynchussp. in Shikoku and Kyushu Islands, Japan. Although the original description did not mention the details of its host use pattern, we found that this species lives almost exclusively within the proboscis gutter of the host, where it is almost hidden from the outside. Such a cryptic habitat is probably the reason why this species has remained undiscovered for over 50 years. Living hidden in the host probosces probably provides an anti-predation benefit forS. thalassemicola. The host echiurans create ciliary water currents on the proboscis gutter to transfer food particles into the mouth, and the bivalves can utilize this water currents for respiration and filter feeding.Sagamiscinitlla thalassemicolais distinctive among ectocommensal galeommatoideans in having a mantle that fully covers the shell valves. It may be a morphological adaptation to protect the shell valves from sand and other hard particles transferred through the proboscis gutter of the host.
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DOI: --
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期刊: Malacologia
影响因子: 1.3
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