Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
Sabellariidae from Lizard Island, Great Barrier Reef, including a new species of Lygdamis and notes on external morphology of the median organ
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DOI：
10.11646/zootaxa.4019.1.10
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发表时间：
2015-09-18
期刊：
影响因子：
0.9
通讯作者：
Hutchings, Pat
中科院分区：
文献类型：
--
作者：
Capa, Maria;Faroni-Perez, Larisse;Hutchings, Pat
本文记录了大堡礁吕宋岛的三种Sabellariidae，包括一种新的Lygdamis物种。在昆士兰州首次报道了产于北领地的龙形香柏。在群岛的浅水沃茨采集到的一种浮游幼虫为代表的Gesaia属是澳大利亚的一个新记录。长吻海蛞蝓sp.的特征是在该科中描述的最明显的中间器官之一（圆柱形，远端着色，并提供一个扁平，泪滴冠），其古形态（外鞘直，外鞘顶端不对称，具鞘壁雕刻，内鞘顶端钝，表面光滑），第2节有3个侧叶，腹毛有2种神经毛纲，和具1 - 4纵行齿的背足钩。对几个种的中间器和中间脊的外部形态进行了比较。即使其功能仍然不确定，中间器官的形态似乎物种特异性，并可能提供有关的信息的进化历史和适应的sabellariids。
We document herein the occurrence of three species of Sabellariidae at Lizard Island, Great Barrier Reef, including a new Lygdamis species. Sabellaria lungalla, described from Northern Territory, is reported for Queensland for the first time. The genus Gesaia, represented by a planktonic larva collected in shallow waters of the Archipelago, is a new record for Australia. Lygdamis nasutus n. sp. is characterised by one of the most conspicuous median organ described in the family (cylindrical, distally pigmented and is provided with a flattened, teardrop corona), its paleae morphology (with straight paleae, outer ones with asymmetrical pointed tips and subtle thecal sculpture and inner paleae with blunt tips and smooth surface), three lateral lobes on chaetiger 2, abdominal chaetigers with two type of neurochaetae, and notopodial uncini with 1-4 longitudinal rows of teeth. Comparison of the external morphology of the medial organ and median ridge of several species has been undertaken. Even though its function remains uncertain, the median organ morphology seems species specific and may provide relevant information about the evolutionary history and adaptations of sabellariids.