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Articles
Published: 2011-06-03

A survey of morphological variation in adult Meristogenys amoropalamus (Amphibia, Anura, Ranidae), with a description of a new cryptic species

Department of Science, Faculty of Education, Aichi University of Education, Kariya, Aichi 448-8542, Japan Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan
Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto 606-8501, Japan
Research and Education Division, Sabah Parks, P. O. Box 10626, Kota Kinabalu 88806, Sabah, Malaysia
Institute for Tropical Biology and Conservation, University Malaysia Sabah, Kota Kinabalu 88999, Sabah, Malaysia
Amphibia trade-off of reproductive traits iris color Borneo cryptic species Meristogenys

Abstract

Previous analyses of molecular and larval morphology have suggested that Meristogenys amoropalamus is composed of two cryptic species, but no diagnostic characters of their adult morphology have been reported. Here, we compared adult characters of these two species and found that they differed in iris colour (yellowish-green and sandy brown), tympanum size and relative limb length. Based on the results of analysis of DNA sequences of the type specimens and a discriminant analysis using 18 morphological variables, we conclude that the lineage with green irises is the true M. amoropalamus, and that the lineage with sandy brown irises is a new species, M. dyscritus sp. nov. In northern Sabah, M. dyscritus is distributed in altitudes lower than those of M. amoropalamus, but the distributional ranges of their larvae overlap in some streams. Meristogenys amoropalamus has larger and lighter-coloured ova, smaller clutch sizes and a more interstitial larval life than M. dyscritus. These differences suggest that M. amoropalamus has a more cryptic life during its larval period than M. dyscritus.

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How to Cite

SHIMADA, T., MATSUI, M., YAMBUN, P., & SUDIN, A. (2011). A survey of morphological variation in adult <em>Meristogenys amoropalamus</em> (Amphibia, Anura, Ranidae), with a description of a new cryptic species. Zootaxa, 2905(1), 33–56. https://doi.org/10.11646/zootaxa.2905.1.3