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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46220

Title: Cryptic diversity of acrothoracican barnacle Armatoglyptes taiwanus in the Indo-Pacific waters, with description of a new species from the Mozambique Channel collected from the French MAINBAZA cruise
Authors: Benny K. K. Chan
Gregory A. Kolbasov
Chi-Chiu Cheang
Contributors: 國立臺灣海洋大學:海洋生物研究所
Keywords: Pleistocene vicariance
12S rDNA
cryptic species
new species
vicariance du Pléistocéne
12S rADN
espèces cryptiques
espèce nouvelle
Date: 2012
Issue Date: 2018-05-09T03:34:35Z
Publisher: Zoosystema
Abstract: Abstract:Cirripedes of the superorder Acrothoracica are normally found as epizoic borings on marine calcareous substrates. Armatoglyptes taiwanus (Utinomi, 1950) is a lithoglyptid acrothoracican barnacle reported from different parts of the Indo-Pacific. Recent studies have demonstrated phylogenetic breaks between the Indian and Pacific Oceans populations in widespread Indo-Pacific marine organisms due to isolation events during the Pleistocene glaciations. It is possible that A. taiwanus represents a cryptic species complex in the Indo-Pacific, which the previous studies have failed to identify from morphology alone. In the present study, we analyzed the morphology and the sequence divergence of the 12S rDNA of A. taiwanus from the Indo-Pacific region, including Taiwan and the Philippines in the Pacific, and Phuket Island (Thailand) and the Mozambique Channel in the Indian Ocean, to test whether A. taiwanus is a cryptic species across its geographical range. The results showed that A. taiwanus has a homogeneous population structure in Taiwan, the Philippines, and Phuket Island (sequence divergence < 1%). Specimens from the Mozambique Channel, although morphologically similar to A. taiwanus, have a greater sequence divergence of 9.4% from A. taiwanus in the Pacific, and thus appeared to represent a new species, described herein as Armatoglyptes flexuosus n. sp. Although both species are morphologically similar, A. flexuosus n. sp. has more strongly bent/recurved posterior processes of the opercular bars and feebler armament of the orificial knob than does A. taiwanus from Taiwan (type locality). Phylogenetic analysis showed that populations of A. flexuosus n. sp. from the Mozambique Channel and A. taiwanus from the Pacific region are indeed closely related. Populations of their common ancestor may have become isolated and underwent speciation during the Pleistocene glaciations.
Relation: 34(1) pp.5-20
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/46220
Appears in Collections:[海洋生物研究所] 期刊論文

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