Morphological observation and rbc L gene sequences studies of two new species, Grateloupia dalianensis H.W.Wang et D.Zha
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Morphological observation and rbcL gene sequences studies of two new species, Grateloupia dalianensis H.W.Wang et D.Zhao, sp. nov. and G. yinggehaiensis H.W.Wang et R.X.Luan, sp. nov. (Halymeniaceae, Rhodophyta) from China ¨ Jianzhou1 , LUAN Rixiao2 ZHAO Dan1 , WANG Hongwei1∗ , SHENG Yingwen1 , LU 1 2
College of Life Sciences, Liaoning Normal University, Dalian 116029, China Dalian Natural History Museum, Dalian 116023, China
Received 11 January 2011; accepted 21 September 2011 ©The Chinese Society of Oceanography and Springer-Verlag Berlin Heidelberg 2012
Abstract A few species in the genus Grateloupia (Halymeniaceae, Rhodophyta) have been investigated in detail with respect to morphological observations and molecular analyses. In this study, the authors document the vegetative and reproductive structures of two new species of Grateloupia, G. dalianensis H.W.Wang et D.Zhao, sp.nov. and G. yinggehaiensis H.W.Wang et R.X.Luan, sp.nov. They both have the morphological character that carpogonial ampullae and auxiliary cell ampullae are the simple Grateloupia-type. The two species can be distinguished from other species of the genus by their distinctive morphological features respectively. Based on ribulose-1,5-bisphosphate carboxylase/oxygenase (rbcL) gene sequences, the phylogenetic tree obtained in the study indicated that they are both embedded within the Grateloupia clade. G. dalianensis clusters a subclade with G. asiatica, and G. yinggehaiensis forms a single monophyletic subclade with G. hawaiiana. Key words: Halymeniaceae, Grateloupia, Grateloupia dalianensis, Grateloupia yinggehaiensis, morphology, rbcL gene
ria have not been in unity. Sometimes two individuals of the same species have been identified as different types, or two different types have been identified artificially as one species. Because of this, Grateloupia is regarded as one of the most difficult subjects classified by algal taxonomists in the world. In recent years, some entities have clarified the taxonomic status by combining molecular and morphological analysis (Wang et al., 2000; Kawaguchi et al., 2001; Gavio, 2002; Gavio and Fredericq, 2002; Mateo-Cid et al., 2005) and obtained positive results very quickly, but because of the diversity, many taxa in the genus still require a critical reassessment. During the course of investigation to assess the diversity of benthic marine macroalgae along the coast of China, we encountered two entities. Through careful observation, we found that not only the external morphology but also the internal structure of the two entities are different from other algae respectively, and we have not found any reports about them up until
1 Introduction The marine red algal genus Grateloupia (Halymeniales, Rhodophyta), containing more than 80 species, is the most species-rich genus and distributed widely throughout the world, whether in temperate or tropical waters (Wang et al., 2000, 2001; Kawaguchi et al., 2001; Gavio and Fredericq, 2002; Faye et al., 2004; De Clerck et al., 2005a, b; Wilkes et al., 2005; see also Guir
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