TY - JOUR
T1 - Phylogenetic analysis and systematic position of two new species of the ant genus Crematogaster (Hymenoptera, Formicidae) from Southeast Asia
AU - Hosoishi, Shingo
AU - Ogata, Kazuo
N1 - Funding Information:
We would like to thank Mr Phourin Chhang and Mr. Vanna Samreth (Forestry Administration, Phnom Penh, Cambodia), Dr Tsuyoshi Kajisa (Kagoshima University) and Dr Nobuya Mizoue (Faculty of Agriculture, Kyushu University) and Dr Tetsukazu Yahara (Faculty of Science, Kyushu University) for helping our field surveys in this study. Important material was received from Dr. Martin Pfeiffer. We would like to thank the ANeT members for encouragement. We thank Francisco Hita Garcia and one anonymous reviewer for useful comments and suggestions. Thanks are also due to Mark Lorenz (Forte Inc.) for improving the English. This work was supported in part by JSPS KAKENHI (Grant-in-Aid for Scientific Research (C)) Grant Number 26440221, JSPS KAKENHI (Grant-in-Aid for Scientific Research (B)) Grant Number 26304014 and Global COE Program (Center of Excellence for Asian Conservation Ecology as a basis of Human-Nature Mutualism), MEXT, Japan.
Publisher Copyright:
© 2017, Museum National d’Histoire Naturelle. All rights reserved.
PY - 2017/11/24
Y1 - 2017/11/24
N2 - Two distinct new species of the ant genus Crematogaster, C. khmerensis sp. nov. and C. pfeifferi sp. nov., are described from Cambodia and Malaysia, respectively. The two species are unique among Asian Crematogaster in that they have vertically directed propodeal spines, but their systematic positions have not been determined based on morphological characters alone. Molecular phylogenetic analysis of 89 Crematogaster taxon matrices previously published plus C. khmerensis sp. nov., using nuclear genes, reveals that C. khmerensis sp. nov. is nested within the Australo-Asian Crematogaster clade. Morphological assignment of the developed pronotal shoulders implies a close relationship between C. khmerensis sp. nov. and the C. tetracantha-group. Based on molecular and morphological evidence, we erect a new species group, C. khmerensis-group, to contain C. khmerensis sp. nov. and C. pfeifferi sp. nov. Divergence time estimates using MCMCTree shows that the root node of the C. khmerensis sp. nov. terminal is estimated to be of middle Miocene age at 15 million years old. The position of the C. khmerensis-group well supports the Oriental- to Australian-region dispersal history that has been proposed for the Australo-Asian Crematogaster clade.
AB - Two distinct new species of the ant genus Crematogaster, C. khmerensis sp. nov. and C. pfeifferi sp. nov., are described from Cambodia and Malaysia, respectively. The two species are unique among Asian Crematogaster in that they have vertically directed propodeal spines, but their systematic positions have not been determined based on morphological characters alone. Molecular phylogenetic analysis of 89 Crematogaster taxon matrices previously published plus C. khmerensis sp. nov., using nuclear genes, reveals that C. khmerensis sp. nov. is nested within the Australo-Asian Crematogaster clade. Morphological assignment of the developed pronotal shoulders implies a close relationship between C. khmerensis sp. nov. and the C. tetracantha-group. Based on molecular and morphological evidence, we erect a new species group, C. khmerensis-group, to contain C. khmerensis sp. nov. and C. pfeifferi sp. nov. Divergence time estimates using MCMCTree shows that the root node of the C. khmerensis sp. nov. terminal is estimated to be of middle Miocene age at 15 million years old. The position of the C. khmerensis-group well supports the Oriental- to Australian-region dispersal history that has been proposed for the Australo-Asian Crematogaster clade.
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U2 - 10.5852/ejt.2017.370
DO - 10.5852/ejt.2017.370
M3 - Article
AN - SCOPUS:85036589155
SN - 1781-1104
VL - 2017
SP - 1
EP - 35
JO - European Journal of Taxonomy
JF - European Journal of Taxonomy
IS - 370
ER -