The anatomy of Lepetella sierrai (Vetigastropoda, Lepetelloidea): implications for reproduction, feeding, and symbiosis in lepetellid limpets
The anatomy of Lepetella sierrai (Vetigastropoda, Lepetelloidea): implications for reproduction, feeding, and symbiosis in lepetellid limpets
复制标题
DOI：
10.1111/ivb.12064
复制
发表时间：
2014-12-01
影响因子：
1.2
通讯作者：
Haszprunar, Gerhard
中科院分区：
文献类型：
--
作者：
Judge, Jenna;Haszprunar, Gerhard
Lepetelloidea是一个小型软体动物的分支，可以作为大陆边缘和深海多样化的案例研究。这一分支中的谱系被发现与不同基质的组合有关，包括热液喷口、渗漏、木材、鲸鱼尸体、多毛类管、软骨藻卵壳、海草根茎、藻类固着器、螃蟹甲壳和海绵。Lepetelloidea家族的成员，Lepetellidae，生活在Hyalinocarpus多毛类成员的空管上或内部。从连续的半薄切片中重建了一个地中海物种Lepetella sierrai Dantart & Luque 1944的详细形态，并与Lepetellidae的其他11个成员进行了比较。雌雄同体的Lepetellid帽贝具有纤毛的精液沟，明显的睾丸和卵巢，具有共同的远端性腺管，和含有成熟精子的贮精囊。存在独特的消化道，具有巨大的食道囊，没有真正的胃，广泛的多叶中肠和短肠。此外，通过光学和透射电子显微镜，揭示了整个地幔边缘的细菌细胞系统。这是第一个公认的证据，细胞内微生物共生在lepetelloidean帽贝。半薄的切片显示有寄生虫的证据，可能是一种甲壳类桡足类动物，穿透了帽贝的体壁。根据本文描述的栖息地的解剖特征和知识，提出了关于生殖生物学、摄食和共生的假设。
The Lepetelloidea, a clade of small limpet-shaped gastropods, can be used as a case study in continental margin and deep-sea diversification. Lineages in this clade have been found associated with a combination of different substrates, including hydrothermal vents, seeps, wood, whale carcasses, polychaete tubes, chondrichthyan egg cases, seagrass rhizomes, algal holdfasts, crab carapaces, and sponges. Members of one lepetelloidean family, Lepetellidae, live on or inside empty tubes of members of the polychaete genus Hyalinoecia. The detailed morphology of a Mediterranean species, Lepetella sierrai Dantart & Luque 1944, was reconstructed in three dimensions from serial semi-thin sections and compared with that of eleven other members of Lepetellidae. The hermaphroditic lepetellid limpets possessed a ciliated seminal groove, distinct testis and ovary with a common distal gonoduct, and a seminal receptacle containing mature sperm. A unique alimentary tract, with huge esophageal pouches, no true stomach, an extensive multilobed midgut, and short intestine, was present. Additionally, a bacteriocyte system throughout the entire mantle rim was revealed via light and transmission electron microscopy. This is the first recognized evidence for intracellular microbial symbiosis in lepetelloidean limpets. Semi-thin sections showed evidence of a parasite, potentially a chitonophilid copepod, penetrating the body wall of the limpet. Hypotheses about reproductive biology, feeding, and symbiosis are presented based on anatomical features and knowledge of the habitat described herein.