Exedrobatrachus Richards, Mahony & Donnellan, 2025

Donnellan, Stephen C., Mahony, Michael J., Esquerré, Damien, Brennan, Ian G., Price, Luke C., Lemmon, Alan, Lemmon, Emily Moriarty, Günther, Rainer, Monis, Paul, Bertozzi, Terry, Keogh, J. Scott, Shea, Glenn M. & Richards, Stephen J., 2025, Phylogenomics informs a generic revision of the Australo-Papuan treefrogs (Anura: Pelodryadidae), Zoological Journal of the Linnean Society 204 : -

Exedrobatrachus Richards, Mahony & Donnellan , gen. nov.

( Fig. 16)

ZooBank LSID: urn:lsid:zoobank.org:act:71F5CD28-163F-474F-97BF-66ADD805188E Type species: Litoria biakensis Günther, 2006 .

Content: One species— Exedrobatrachus biakensis * (Günther, 2006) comb. nov.

Diagnosis: Exedrobatrachus can be diagnosed from Papuahyla by tubercules on the hindlimb vs. an unornamented hindlimb, by a fusiform vs. right triangular call envelope shape, and 13 sites in the mitochondrial ND4 alignment ( Table 3). Exedrobatrachus can be diagnosed from Exochohyla by the absence vs. presence of a rostral spike, the occurrence of small pigmented vs. large unpigmented ova; and from each species of Ischnohyla by species specific combination of each of the four following characters: by small vs. medium ( I. nigropunctata and I. umarensis ) or large ( I. daraiensis and I. gracilis ) eggs; pigmented vs. unpigmented ( I.gracilis ) eggs; absence vs. presence ( I. gracilis and I. nigropunctata ) of the vomerine teeth; toe discs smaller than finger disc vs. equal ( I. gracilis , I. nigropunctata , I. umarensis , and I. vocivincens ). Refer to Tables 1 and 2.

Distribution and ecology: Arboreal frogs that are found in swamps with thickets of trees and brush on Biak Island, Papua Province, Indonesia ( Günther 2006b).

Etymology: From the Greek ἔξεΔΡος (exedros, away from home) and βάτΡαΧος (batrachos, frog). Both the original batrachos and the Latinized batrachus are masculine (Article 30.1.3). The name alludes to the biogeographically and phylogenetically isolated nature of the lineage.

Remarks: A monotypic genus with a distribution confined to Biak Island, a continental island which harbours a number of endemic vertebrates ( Bergmans and Sarbini 1985, Groves and Flannery 1994, Jacobs 2002).