A large testate protist, Gromia sphaerica sp nov (Order Filosea), from the bathyal Arabian Sea
A large testate protist, Gromia sphaerica sp nov (Order Filosea), from the bathyal Arabian Sea
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DOI：
10.1016/s0967-0645(99)00100-9
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发表时间：
2000-01-01
影响因子：
3
通讯作者：
Smith, CR
中科院分区：
文献类型：
--
作者：
Gooday, AJ;Bowser, SS;Smith, CR
深海为几种大型有遗嘱原生生物提供了栖息地，例如，异源植物和科莫基亚类。然而，有壳变形虫（Lobusea和Filosea目）从未在270米深度以下可靠地报告过。在这里，我们描述了大型球形原生生物，直径达近40毫米，在阿曼大陆坡的箱形岩心，多岩心和底栖雪橇样品回收（西北阿拉伯海）在RRS发现巡航211期间，标本由一个有机信封，有许多小孔，封闭了大量的细废料颗粒（Stercomata），根据其壁的超微结构（通过高压透射电子显微镜显示），这种生物被鉴定为丝状属Gromia的成员，II在本文中被描述为Gromia sphaerica sp. nov.。壁是分层的，包括“蜂窝膜”，这是该属所特有的结构。这一新物种是第一个在深海中被报道的格罗密科动物。它生活在主氧气最低区以下约1200至1630米之间，在一个底层水氧气浓度约为0.47毫升（-1）的区域。在1273 m（2.7个个体m（-2））、1318 m（2.7个个体m（-2））、1318 m（2.7个个体m（-2））和1318 m（2.7个个体m（-2））的海底照片中，可以清楚地看到该新种。m（-2））、1624 m（17.3 indiv，m（-2））和1633 m（76.5 indiv，m（-2））。m（-2））。它们部分嵌入海底，有时两三个一组。样本通常被浅色沉积物的围裙包围，可能是它们的进食活动造成的。当它们非常接近时，一个样本周围的围裙通常会掩盖相邻的测试。(C)1999 Elsevier Science Ltd.保留所有权利。
The deep ocean provides a habitat for several large testate protistan taxa, e.g., xenophyophores and komokiaceans. However, testate amoebae (orders Lobusea and Filosea) have never been reliably reported from below 270 m depth. Here we describe large spherical protists, up to almost 40 mm diameter, recovered in box core, multicore, and epibenthic sledge samples taken on the continental slope off Oman (NW Arabian Sea) during RRS Discovery Cruise 211, Specimens consist of an organic envelope, with numerous tiny apertures, enclosing a mass of fine waste pellets (stercomata), On the basis of its wall ultrastructure (revealed by high-voltage transmission electron microscopy), this organism is identified as a member of the filosean genus Gromia, II is described herein as Gromia sphaerica sp. nov. The wall is layered and includes the 'honeycomb membrane', a structure that is unique to this genus. The new species is the first gromiid to be reported from the deep sea. It lives between about 1200 and 1630 m below the main oxygen minimum zone, in an area where bottom-water oxygen concentrations are around 0.47 mi l(-1). The new gromiid species is clearly visible in bottom photographs taken at 1273 m (2.7 individuals m(-2)), 1318 m (2.7 indiv. m(-2)), 1624 m (17.3 indiv, m(-2)) and 1633 m (76.5 indiv. m(-2)). They lie partly embedded in the seafloor and are sometimes grouped in twos and threes. Specimens are typically surrounded by an apron of lighter-coloured sediment, possibly resulting from their feeding activities. Where they lie in very close proximity, the apron around one specimen typically obscures adjacent tests. (C) 1999 Elsevier Science Ltd. All rights reserved.