Rugiloricus bacatus sp nov (Loricifera-Pliciloricidae) and a ghost-larva with paedogenetic reproduction
Rugiloricus bacatus sp nov (Loricifera-Pliciloricidae) and a ghost-larva with paedogenetic reproduction
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DOI：
10.1017/s147720000800265x
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发表时间：
2008-06-01
影响因子：
1.9
通讯作者：
Heiner, Iben
中科院分区：
文献类型：
--
作者：
Heiner, Iben
本文描述了北大西洋法罗河岸的一新种Rugiloricus bacatus sp. nov.和另外两种Rugiloricus sp. nov. A和B的诊断。这三个物种的特点是存在一种新的减少的幼虫，一种幽灵幼虫。1986年，Jeanne Renaud-Mornant发现了这种退化的幼虫，但正是在法罗河岸的材料中，人们第一次发现了这种幽灵幼虫属于Loricifera门。幽灵幼虫要么在晚期希金斯幼虫（称为倒数第二希金斯幼虫）体内发现，要么在沉积物中发现。法罗浅滩的三种希金斯幼虫可以通过前刚毛、后刚毛和脚趾等特征来区分。成虫的特征是有明显的象珍珠项链一样的皱领；在第一行中，8个克拉氏键中有2个被修改；第二排腿状的鳞片非常大，结实，第九排有30个喙状的鳞片和30个交替的板。后幼虫是自由生活的，它们在内向者身上的烫伤被还原为原烫伤。没有发现褐家蝇A和B的幼虫后期和成虫阶段，因此本文只介绍这两个物种的诊断。
A new species of Loricifera, Rugiloricus bacatus sp. nov. is described together with the diagnoses of two other Rugiloricus species, Rugiloricus sp. nov. A and B, from the Faroe Bank (North Atlantic). Characteristic for all three species is the presence of a new type of reduced larva, a ghost-larva. This type of reduced larva was discovered in 1986 by Jeanne Renaud-Mornant, but it was with the Faroe Bank material that it was first discovered that the ghost-larvae belonged to the phylum Loricifera. The ghost-larvae are either found inside late instar Higgins-larvae, called penultimate Higgins-larvae, or in the sediment. The three types of Higgins-larvae from the Faroe Bank can be distinguished by characters such as anterior setae, posterior setae and toes. The adults of Rugiloricus bacatus sp. nov. are characterised by a prominent ruff resembling a pearl necklace; two of the eight clavoscalids are modified in the 1st row; the 2nd row of leg-shaped scalids are very large and, robust, and the 9(th) row with 30 beak-like scalids alternating with 30 alternating plates. The postlarvae are free-living and their scalids on the introvert are reduced to protoscalids. Postlarvae and adult stages have not been found for Rugiloricus sp. nov. A and B and therefore only diagnoses of these two species are presented here.