Abstract
Frogs of the genus Ptychadena (Boulenger, 1917) have long been identified as harboring cryptic diversity and comprising numerous species-complexes (Largen 1997; Zimkus et al. 2017), and many authors have recognized the particularly high hidden richness in the Ethiopian highlands (Largen 1997; see Largen & Spawls 2010 and refs. within). This cryptic diversity was confirmed by recent molecular studies (Freilich et al. 2014; Smith et al. 2017a, Reyes-Velasco et al. 2018). Those authors identified a congruent set of evolutionarily distinct candidate species using both mitochondrial and nuclear DNA, and described the geographic and ecological isolation of these species in detail (Freilich et al. 2014; Smith et al. 2017a).
References
Bauer, A.M., Parham, J.F., Brown, R.M., Stuart, B.L., Grismer, L. Papenfuss, T.J., Böhm, W., Savage, J.M., Carranza, S., Grismer, J.L., Wagner, P., Schmitz, A., Anajeva, N.B. & Inger, R.F. (2011) Availability of new Bayesian-delimited gecko names and the importance of character-based species descriptions. Proceedings of the Royal Society, B, 278, 490–492.
https://doi.org/10.1098/rspb.2010.1330
Boulenger, G.A. (1917) Sur la conformation des phalangettes chez certaines grenouilles d’Afrique. Comptes Rendus Hebdomadaires des Séances de l’Académie des Sciences. Paris, 165, 987–990.
https://doi.org/10.5962/bhl.part.1217
Carstens, B.C., Pelletier, T.A., Reid, N.M. & Satler, J.D. (2013) How to fail at species delimitation. Molecular Ecology, 22, 4369–4383.
https://doi.org/10.1111/mec.12413
Cook, L.G., Edwards, R.D., Crisp, M.D. & Hardy, N.B. (2010) Need morphology always be required for new species descriptions? Invertebrate Systematics, 24, 322.
https://doi.org/10.1071/IS10011
Dubois, A., Bour, R. & Ohler, A. (2015) Nomenclatural availability of preliminary electronic versions of taxonomic papers: in need of a clear definition. The Bulletin of Zoological Nomenclature, 72, 252–265.
https://doi.org/10.21805/bzn.v72i3.a1
Freilich, X., Tollis, M. & Boissinot, S. (2014) Hiding in the highlands: Evolution of a frog species complex of the genus Ptychadena in the Ethiopian highlands. Molecular Phylogenetics and Evolution, 71, 157–169.
https://doi.org/10.1016/j.ympev.2013.11.015
Gaston, K.J. & Mound, L.A. (1993) Taxonomy, hypothesis testing and the biodiversity crisis. Proceedings of the Royal Society B: Biological Sciences, 251, 139–142.
https://doi.org/10.1098/rspb.1993.0020
ICZN (1999) International Code of Zoological Nomenclature. 4th Edition. Available from: http://iczn.org/iczn/index.jsp (accessed 5 May 2020)
Kaiser, H., Crother, B.I., Kelly, C.M.R., Luiselli, L., O’Shea, M., Hidetoshiota, Passos, P., Schleip, W.D. & Wuster, W. (2013) Best practices: In the 21st century, taxonomic decisions in herpetology are acceptable only when supported by a body of evidence and pulished via peer review. Herpetological Review, 44, 8–23.
Largen, M. & Spawls, S. (2010) The amphibians and reptiles of Ethiopia and Eritrea. Edition Chimera, Frankfurt am Main, 693 pp.
Largen, M.J. (1997) An annotated checklist of the amphibians and reptiles of Eritrea, with keys for their identification. Tropical Zoology, 10, 63–115.
https://doi.org/10.1080/03946975.1997.10539328
Leach, A.D. & Fujita, M.K. (2010) Bayesian species delimitation in West African forest geckos (Hemidactylus fasciatus). Proceedings of the Royal Society, B, 277, 3071–3077.
https://doi.org/10.1098/rspb.2010.0662
Mallet, J. (2013) Species, concepts of. In: Levin, S.A. (Ed.), Encyclopedia of Biodiversity, 2nd Edition. Academic Press, Waltham, Massachusetts, pp. 679–691.
https://doi.org/10.1016/B978-0-12-384719-5.00131-3
Medina, M.F., Bauer, A.M., Branch, W.R., Schmitz, A., Conradie, W., Nagy, Z.T., Hibbitts, T.J., Ernst, R., Portik, D.M., Nielsen, S. V., Colston, T.J., Kusamba, C., Behangana, M., Rödel, M.-O. & Greenbaum, E. (2016) Molecular phylogeny of Panaspis and Afroablepharus skinks (Squamata: Scincidae) in the savannas of sub-Saharan Africa. Molecular Phylogenetics and Evolution, 100, 409–423.
https://doi.org/10.1016/j.ympev.2016.04.026
de Queiroz, K.D. (2007) Species concepts and species delimitation. Systematic Biology, 56, 879–886.
https://doi.org/10.1080/10635150701701083
Renner, S.S. (2016) A return to linnaeus’s focus on diagnosis, not description: The use of DNA characters in the formal naming of species. Systematic Biology, 65, 1085–1095.
https://doi.org/10.1093/sysbio/syw032
Reyes-Velasco, J., Manthey, J.D., Bourgeois, Y., Freilich, X. & Boissinot, S. (2018) Revisiting the phylogeography, demography and taxonomy of the frog genus Ptychadena in the Ethiopian highlands with the use of genome-wide SNP data. Plos One, 13, e0190440.
https://doi.org/10.1371/journal.pone.0190440
Smith, M.L., Noonan, B.P. & Colston, T.J. (2017a) The role of climatic and geological events in generating diversity in Ethiopian grass frogs (genus Ptychadena ). Royal Society Open Science, 4, 170021.
https://doi.org/10.1098/rsos.170021
Smith, M.L., Noonan, B.P. & Colston, T.J. (2017b) Correction to “The role of climatic and geological events in generating diversity in Ethiopian grass frogs (genus Ptychadena ). Royal Society Open Science, 4, 171389.
https://doi.org/10.1098/rsos.171389
Zimkus, B.M., Lawson, L.P., Barej, M.F., Barratt, C.D., Channing, A., Dash, K.M., Dehling, J.M., Du Preez, L., Gehring, P.-S., Greenbaum, E., Gvozdík, V., Harvey, J., Kielgast, J., Kusamba, C., Nagy, Z.T., Pabijan, M., Penner, J., Rödel, M.-O., Vences, M. & Lötters, S. (2017) Leapfrogging into new territory: How Mascarene ridged frogs diversified across Africa and Madagascar to maintain their ecological niche. Molecular Phylogenetics and Evolution, 106, 254–269.
https://doi.org/10.1016/j.ympev.2016.09.018