Chan Benny K K, Cheang Chi Chiu
Biodiversity Research Center, Academia Sinica, Taipei 115, Taiwan; Email: unknown.
Department of Science and Environmental Studies & Centre for Education in Environmental Sustainability, Hong Kong Institute of Education, Taipo, Hong Kong; Email: unknown.
Zootaxa. 2015 Aug 19;4000(5):547-58. doi: 10.11646/zootaxa.4000.5.4.
The present study describes a new barnacle, Chthamalus williamsi sp. nov., from rocky shores in Taiwan. Chthamalus williamsi sp. nov. belongs to the challengeri subgroup of Chthamalus due to cirrus I having no conical spines and the setae on cirri II having no basal guards. Within the challengeri sub-group, C. williamsi sp. nov. differs from C. challengeri Hoek, 1883, C. dalli Pilsbry, 1916 and C. montagui Southward, 1976 by its scutum and the tergum both having straight articular margins. Chthamalus moro Pilsbry, 1916 differs from C. williamsi sp. nov. in having strong ribbing on the shell surface, and C. williamsi sp. nov. differs from C. antennatus Darwin, 1854 by having a normal form cirrus III, rather than an antenniform cirrus III as in C. antennatus. The external morphology and size of C. williamsi sp. nov. are similar to C. sinensis Ren, 1984 (C. neglectus Yan & Chan, 2004 is a synonym of C. sinensis, from molecular data presented in the present study) but the scutum of C. williamsi sp. nov. has a height similar to its width, whilst the scutum of C. sinensis is much depressed, being wider than high. From molecular analysis of a mitochondrial COI region, C. williamsi sp. nov. formed a distinct clade (divergence >15%) from other described species in the challengeri subgroup including C. challengeri, C. sinensis, C. moro, C. montagui and C. dalli, suggesting that it is a new species.
本研究描述了一种来自台湾岩岸的新藤壶，威廉氏龟藤壶（Chthamalus williamsi sp. nov.）。威廉氏龟藤壶属于龟藤壶属的查林杰氏亚组，因为第一触角没有锥形刺，第二触角上的刚毛没有基部防护。在查林杰氏亚组中，威廉氏龟藤壶与1883年的霍克氏龟藤壶（C. challengeri Hoek）、1916年的达利氏龟藤壶（C. dalli Pilsbry）和1976年的蒙塔古氏龟藤壶（C. montagui Southward）不同，其背板和腹板的关节边缘都是直的。1916年的莫罗氏龟藤壶（C. moro Pilsbry）与威廉氏龟藤壶的区别在于壳表面有强烈的肋纹，而威廉氏龟藤壶与1854年的触角状龟藤壶（C. antennatus Darwin）的区别在于第三触角是正常形态，而不是像触角状龟藤壶那样是触角形。威廉氏龟藤壶的外部形态和大小与1984年的中华龟藤壶（C. sinensis Ren）相似（根据本研究提供的分子数据，2004年的被忽视龟藤壶（C. neglectus Yan & Chan）是中华龟藤壶的同义词），但威廉氏龟藤壶的背板高度与其宽度相似，而中华龟藤壶的背板则凹陷得多，宽度大于高度。通过对线粒体COI区域的分子分析，威廉氏龟藤壶与查林杰氏亚组中其他已描述的物种，包括霍克氏龟藤壶、中华龟藤壶、莫罗氏龟藤壶、蒙塔古氏龟藤壶和达利氏龟藤壶，形成了一个独特的分支（分歧度>15%），表明它是一个新物种。
