부산대학교 도서관

A review is given of the Ngirhaphium species of Southeast Asia and two new species are described from Thailand. Ngirhaphium meieri Samoh & Grootaert, new species is described from a mangrove in Takua Pa district, Phang Nga Province, peninsular Thailand. NGS-barcodes (313 bp) are congruent with traditional taxonomic delimitation. Ngirhaphium caeruleum Grootaert & Puniamoorthy sensu lato seems to consist of a species-complex with 32 haplotypes and has a wide distribution in the southern part of the South China Sea. There is a 4.2% genetic difference between the Thai/Cambodian population and the Singapore/Brunei populations in N. caeruleum: despite the many haplotypes and differences in male terminalia, the Thai and Cambodian haplotypes formed a haplotype group, while the Singapore and Bruneian specimens formed another haplotype group. Nonetheless, the Thai population is morphological distinct enough to be considered a morpho-species: it is here described as N. thaicum Samoh & Grootaert, new species. An updated distribution of the six Southeast Asian Ngirhaphium species is given with additional taxonomic notes, a key to the species and a phylogenetic diagram. We find that the Andaman Sea coast to be the most diverse with four species while the South China Sea region has only two species both belonging to the caeruleum species complex. N. sivasothii Grootaert & Puniamoorthy is common and occurring from Singapore up to the Thai coast of the Andaman Sea, with 28 haplotypes. Remarkable in all species is the limited distribution of the haplotypes, where most seem endemic to a limited area and thus provide information about the origin of the distribution. [ABSTRACT FROM AUTHOR]