Cryptic diversity of the acrothoracican barnacle Armatoglyptes taiwanus in the Indo-Pacific waters, with description of a new species from the Mozambique Channel collected from the MAINBAZA cruise

Benny K. K. CHAN, Gregory A. KOLBASOV, Chi Chiu CHEANG

Research output: Contribution to journalArticles

3 Citations (Scopus)

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. Copyright © 2012 Publications Scientifiques du Muséum national d'Histoire naturelle paris.
Original languageEnglish
Pages (from-to)5-20
JournalZoosystema
Volume34
Issue number1
DOIs
Publication statusPublished - Mar 2012

Citation

Chan, B. K. K., Kolbasov, G. A., & Cheang, C.-C. (2012). Cryptic diversity of the acrothoracican barnacle Armatoglyptes taiwanus in the Indo-Pacific waters, with description of a new species from the Mozambique Channel collected from the MAINBAZA cruise. Zoosystema, 34(1), 5-20. doi: 10.5252/z2012n1a1

Keywords

  • Cirripedia
  • Pleistocene vicariance
  • Phylogeny
  • 12S rDNA
  • SEM
  • Morphology
  • Cryptic species
  • New species
  • Cirripèdes
  • Vicariance du Pléistocéne
  • Phylogénie
  • 12S rADN
  • MEB
  • Morphologie
  • Espèces cryptiques
  • Espèce nouvelle

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