Ryan J. Thoni

• Doctor of Philosophy
• Curatorial Associate at American Museum of Natural History

In this account of the Fishes of Bhutan, 109 species from 24 families are recorded. Color photographs of live specimens are provided for most species for field identification. Locality information is given for each record in order to provide distributional data for future monitoring. Some species are new, yet to be described at the time of this pub...

Torrent catfishes of the subfamily Glyptosterninae from Bhutan are examined based on morphological and molecular data. Five new species are described: Creteuchiloglanis bumdelingensis sp. nov., Exostoma mangdechhuensis sp. nov., Parachiloglanis benjii sp. nov., P. dangmechhuensis sp. nov., and P. drukyulensis sp. nov. Molecular data derived from th...

Abstract Seven species of Garra are herein accounted for in Bhutan. Three new records of known species, G. arupi, G. birostris, and G. lissorhynchus, and two new species, G. bimaculacauda sp. nov. and G. parastenorhynchus sp. nov., are reported from central and southern Bhutan. Garra bimaculacauda sp. nov. is most notably different from its congene...

Garra robertsi is described from specimens collected from the Sungai Bongan and Tempassuk rivers in Sabah, Borneo. The species is differentiated from G. borneensis, its only congener on the island of Borneo, in having five (versus four) transverse scale rows above lateral line, the first branched dorsal-fin ray extending beyond the posterior-most e...

Parachiloglanis bhutanensis is a newly discovered species of torrent catfish from eastern Bhutan. With its discovery, the genus Parachiloglanis is no longer monotypic. The species differs from Parachiloglanis hodgarti in meristic, mensural, and coloration characters. Parachiloglanis bhutanensis is confirmed as a member of the genus by the absence o...

This investigation and critical revision of the ichthyofauna of Tajikistan is the result of two nationwide surveys completed by the authors in 2017 and 2019 combined with an analytical examination of previous studies. The ichthyofauna of Tajikistan includes 60 species, of which 44 are native and 15 are nonnative, while one species (Cyprinus carpio)...

The fish fauna of the Kabul River downstream of the City of Kabul face threats from increasing human population such as pollution, overfishing, and increased development. Despite the rapid increase of these activities leading to threats to fishes in the Kabul River, no studies have examined the changes in diversity, distribution, and abundance of f...

The fish fauna of the Kabul River downstream of the City of Kabul face threats from increasing human population such as pollution, overfishing, and increased development. Despite the rapid increase of these activities leading to threats to fishes in the Kabul River, no studies have examined the changes in diversity, distribution, and abundance of f...

Alburnoides holciki was described from the Hari River basin, which was the only basin it was known from. Populations from the Amu Darya basin were previously recognized as A. eichwaldii or Alburnoides sp. Our study recognized specimens of Alburnoides from the Amu Darya basin as A. holciki based on morphological data and the COI barcode gene. The po...

Exostoma oschanini, presently treated as a junior synonym of Glyptosternon reticulatum, is revalidated within Glyptosternon based on a phylogenetic analysis of the CO1 gene and morphological characters. Glyptosternon oschanini is known to occur in tributaries of the Syr Darya River in Uzbekistan and Kyrgyzstan and may also occur in the Amu Darya Ri...

Garra fluviatilis is a new species described herein from the Kwai Noi, Mae Khlong basin, in the Thong Pha Phum District of Kanchanaburi Province in western Thailand. It is diagnosed by the following combination of morphological characters: well developed upper lip with unculiferous papillae, mottled pigmentation pattern, a pleated papilliferous fol...

In 1842, a loach was described with great brevity in McClelland's "On the freshwater fishes collected by William Griffith during his travels from 1835 to 1842" (McClelland 1842). The species was named Cobitis boutanensis McClelland and Griffith 1842, presumably after the country where it was collected. At that time, there was not a consensus on the...

Over the past century dams have played a major role in restructuring North American stream communities. Effects of large dams on fish assemblages are well studied; however, effects of small dams are relatively unstudied. Sunfishes (family Centrarchidae) include many meso- and apex predators that are key components of North American lotic and lentic...