Abstract
The Leptolalax applebyi group of Asian leaf-litter frogs currently comprises four species of particularly small-bodied (<40 mm SVL) species distributed in the Central Highlands of Vietnam and northeastern Cambodia. In addition to their small size, the group is characterized by their morphological and genetic similarities, as well as their breeding habitat at headwaters of small mountain streams and seeps. A recent study suggested that at least two-thirds of the diversity of the group remained hidden within morphologically cryptic lineages. We expand upon the molecular, morphometric, and acoustic data and formally delineate and describe five of these lineages as distinct species: Leptolalax ardens sp. nov., Leptolalax kalonensis sp. nov., Leptolalax pallidus sp. nov., Leptolalax maculosus sp. nov., and Leptolalax tadungensis sp. nov. Due to habitat loss, the current ranges of these species are likely to be a fraction of their historical extent and under continued threat from deforestation.
References
Boulenger, G.A. (1900) Descriptions of new batrachians and reptiles from the Larut Hills, Perak. Annals and Magazine of Natural History, Series 7, 6, 186–194.
http://dx.doi.org/10.1080/00222930008678356Boulenger, G.A. (1893) Concluding report on the reptiles and batrachians obtained in Burma by Signor L. Fea, dealing with the collection made in Pegu and the Karin Hills in 1887-88. Annali del Museuo Civico di Genoa, 13, 304–347.
Boulenger, G.A. (1908) A revision of the Oriental pelobatid batrachians (genus Megalophrys). Proceedings of the Zoological Society of London, 1908, 407–430.
http://dx.doi.org/10.1111/j.1096-3642.1908.tb01852.xCocroft, R.B. & Ryan, M.J. (1995) Patterns of advertisement call evolution in toads and chorus frogs. Animal Behaviour, 49, 283–303.
http://dx.doi.org/10.1006/anbe.1995.0043Darriba, D., Taboada, G.L., Doallo, R. & Posada, D. (2012) jModelTest 2: more models, new heuristics and parallel computing. Nature Methods, 9 (8), 772–772.
Dehling, J.M. (2012) Eine neue Art der Gattung Leptolalax (Anura: Megophryidae) vom Gunung Benom, Westmalaysia/A new species of the genus Leptolalax (Anura: Megophryidae) from Gunung Benom, Peninsular Malaysia. Sauria, 34, 9–21.
Dubois, A. (1983) Note preliminaire sur le genre Leptolalax Dubois, 1980 (Amphibiens, Anoures), avec diagnose d’une espece novelle du Vietnam. Alytes, 2, 147–153.
Duellman, W.E. (1970) The Hylid Frogs of Middle America. Monograph of the Museum of Natural History, University of Kansas, 1, 1–427.
Fei, L., Hu, S., Ye, C. & Huang, Y. (2009) Fauna Sinica. Amphibia. Vol. 2. Anura. Science Press, Beijing, 957 pp.
Fei, L., Ye, C. & Huang, Y. (1991 “1990”) Key to Chinese Amphibia. Chongqing Branch Science and Technology Literature Press, Chongquing, 364 pp.-
Fei, L., Ye, C. & Jiang, J. (2010) Colored Atlas of Chinese Amphibians. Sichuan Publishing Group, Sichuan Publishing House of Science & Technology, Sichuan, 519 pp.
Frost, D.R. (2015) Amphibian species of the world: An Online Reference, version 6.0. American Museum of Natural History, New York. Available from: http://research.amnh.org/herpetology/amphibia/index.php/ (accessed 2 February 2016)
Hillis, D.M., Frost, J.S. & Wright, D.A. (1983) Phylogeny and biogeography of the Rana pipiens complex: a biochemical evaluation. Systematic Biology, 32, 132–143.
http://dx.doi.org/10.1093/sysbio/32.2.132Inger, R.F., Orlov, N. & Darevsky, I. (1999) Frogs of Vietnam: a report on new collections. Fieldiana Zoology, 92, 1–46.
Jiang, K., Yan, F., Suwannapoom, C., Chomdej, S. & Che, J. (2013) A new species of the genus Leptolalax (Anura: Megophryidae) from northern Thailand. Asian Herpetological Research, 4, 100–108.
http://dx.doi.org/10.3724/SP.J.1245.2013.00100Lathrop, A., Murphy, R.W., Orlov, N. & Ho, C.T. (1998) Two new species of Leptolalax (Anura: Megophryidae) from northern Vietnam. Amphibia-Reptilia, 19, 253–267.
http://dx.doi.org/10.1163/156853898X00160Matsui, M. (1997) Call characteristics of Malaysian Leptolalax with a description of two new species (Anura: Pelobatidae). Copeia, 1997, 158–165.
http://dx.doi.org/10.2307/1447851Matsui, M. (2006) Three new species of Leptolalax from Thailand (Amphibia, Anura, Megophryidae). Zoological Science, 23, 821–830.
http://dx.doi.org/10.2108/zsj.23.821Matsui, M., Belabut, D.M., Ahmad, N. & Yong, H.-S. (2009) A new species of Leptolalax (Amphibia, Anura, Megophryidae) from Peninsular Malaysia. Zoological Science, 26, 243–247.
http://dx.doi.org/10.2108/zsj.26.243Meyfroidt, P. & Lambin, E.F. (2008) The causes of the reforestation in Vietnam. Land Use Policy, 25 (2), 182–197.
http://dx.doi.org/10.1016/j.landusepol.2007.06.001Moran, M.D. (2003) Arguments for rejecting the sequential Bonferroni in ecological studies. Oikos, 2003 403–405.
http://dx.doi.org/10.1034/j.1600-0706.2003.12010.xNakagawa, S. (2004) A farewell to Bonferroni: the problems of low statistical power and publication bias. Behavioral Ecology, 15 (6), 1044–1045.
http://dx.doi.org/10.1093/beheco/arh107Ohler, A., Marquis, O., Swan, S. & Grosjean, S. (2000) Amphibian biodiversity of Hoang Lien Nature Reserve (Lao Cai Province, northern Vietnam) with description of two new species. Herpetozoa, 13, 71–87.
Ohler, A., Wollenberg, K.C., Grosjean, S., Hendrix, R., Vences, M., Ziegler, T. & Dubois, A. (2011) Sorting out Lalos: description of new species and additional taxonomic data on megophryid frogs from northern Indochina (genus Leptolalax, Megophryidae, Anura). Zootaxa, 3147, 1–83.
Palumbi, S. (1991) Simple fool's guide to PCR. Department of Zoology, University of Hawaii, Honolulu, HI, 45 pp.
Perneger, T.V. (1998) What’s wrong with Bonferroni adjustments. BMJ: British Medical Journal, 316 (7139), 1236.
http://dx.doi.org/10.1136/bmj.316.7139.1236Poyarkov, N.A. Jr., Rowley, J.J.L., Gogoleva, S.I., Vassilieva, A.B., Galoyan, E.A. & Orlov, N. L. (2015) A new species of Leptolalax (Anura: Megophryidae) from the western Langbian Plateau, southern Vietnam. Zootaxa, 3931 (2), 221–252.
http://dx.doi.org/10.11646/zootaxa.3931.2.3Rambaut, A. & Drummond, A.J. (2007) Tracer v1. 4. Available from: http://beast.bio.ed.ac.uk/Tracer (accessed 19 January 2016)
Rambaut, A. & Drummond, A.J. (2009) Figtree v1.3.1. Available from: http://tree.bio.ed.ac.uk/software/figtree/ (accessed 19 January 2016)
Ronquist, F., Teslenko, M., van der Mark, P., Ayres, D.L., Darling, A., Höhna, S., Larget, B., Liu, L., Suchard, M.A. & Huelsenbeck, J.P. (2012) MrBayes 3.2: efficient Bayesian phylogenetic inference and model choice across a large model space. Systematic Biology, 61, 539–542.
http://dx.doi.org/10.1093/sysbio/sys029Rowley, J.J.L. & Cao, T.T. (2009) A new species of Leptolalax (Anura: Megophryidae) from central Vietnam. Zootaxa, 2198, 51–60.
Rowley, J.J.L., Le, D.T.T., Tran, D.T.A. & Hoang, H.D. (2011) A new species of Leptolalax (Anura: Megophryidae) from southern Vietnam. Zootaxa, 2796, 15–28.
Rowley, J.J.L., Stuart, B.L., Neang, T. & Emmett, D.A. (2010a) A new species of Leptolalax (Anura: Megophryidae) from northeastern Cambodia. Zootaxa, 2567, 57–68.
Rowley, J.J.L., Stuart, B.L., Richards, S.J., Phimmachak, S. & Sivongxay, N. (2010b) A new species of Leptolalax (Anura: Megophryidae) from Laos. Zootaxa, 2681, 35–46.
Rowley, J.J.L., Hoang, D.H., Le, T.T.D., Dau, Q.V. & Cao, T.T. (2010c) A new species of Leptolalax (Anura: Megophryidae) from Vietnam and further information on Leptolalax tuberosus. Zootaxa, 2660, 33–45.
Rowley, J., Brown, R., Kusrini, M., Inger, R., Stuart, B., Wogan, G., Chan-ard, T., Cao, T.T., Diesmos, A., Iskandar, D.T., Lau, M., Ming, L.T., Makchai, S., Neang, T., Nguyen, Q.T. & Phimmachak, S. (2010d) Impending conservation crisis for Southeast Asian amphibians. Biology Letters, 6, 336–338
http://dx.doi.org/10.1098/rsbl.2009.0793Rowley, J.J.L., Hoang, D.H., Dau, Q.V., Le, T.T.D. & Cao, T.T. (2012) A new species of Leptolalax (Anura: Megophryidae) from central Vietnam. Zootaxa, 3321, 56–68.
Rowley, J.J.L., Dau, V.Q. & Nguyen, T.T. (2013) A new species of Leptolalax (Anura: Megophryidae) from the highest mountain in Indochina. Zootaxa, 3737 (4), 415–428.
http://dx.doi.org/10.11646/zootaxa.3737.4.5Rowley, J.J.L., Stuart, B.L., Neang, T., Hoang, H.D., Dau, V.Q., Nguyen, T.T. & Emmett, D.A. (2015) A new species of Leptolalax (Anura: Megophryidae) from Vietnam and Cambodia . Zootaxa, 4039 (3), 401–417.
http://dx.doi.org/10.11646/zootaxa.4039.3.1Rowley, J.J.L., Tran, D.T.A., Frankham, G.J., Dekker, A.H., Le, D.T.T., Nguyen, T.Q., Dau, V.Q. & Hoang, H.D. (2015) Undiagnosed cryptic diversity in small, microendemic frogs (Leptolalax) from the Central Highlands of Vietnam. PLoS ONE, 10 (5), e0128382.
http://dx.doi.org/10.1371/journal.pone.0128382Sukumaran, J. & Holder, M.T. (2010) DendroPy: a Python library for phylogenetic computing. Bioinformatics, 26, 1569–1571.
http://dx.doi.org/10.1093/bioinformatics/btq228Tamura, K., Peterson, D., Peterson, N., Stecher, G., Nei, M. & Kumar, S. (2011) MEGA 5: molecular evolutionary genetics analysis using maximum likelihood, evolutionary distance, and maximum parsimony methods. Molecular Biology and Evolution, 28, 2731–2739.
http://dx.doi.org/10.1093/molbev/msr121Wilcox, T.P., Zwickl, D.J., Heath, T.A. & Hillis, D.M. (2002) Phylogenetic relationships of the dwarf boas and a comparison of Bayesian and bootstrap measures of phylogenetic support. Molecular Phylogenetics and Evolution, 25, 361–371.
http://dx.doi.org/10.1016/S1055-7903(02)00244-0Zwickl, D.J. (2006) Genetic algorithm approaches for the phylogenetic analysis of large biological sequence datasets under the maximum likelihood criterion. Ph.D. dissertation, The University of Texas at Austin. [unkown pagination]