Oldřich Říčan

Crenicichla yaha was described from the Urugua-í river (arroyo Urugua-í; and erroneously on one specimen from the Rio Iguazú) in Misiones, Argentina. The species was only known from nine specimens collected in 1986 during an environmental impact study prior to the construction of the Urugua-í hydroelectric dam in 1989. The species has not been coll...

We present a taxonomically complete and topologically robust molecular phylogeny of the Middle American heroine cichlids based on which we review their diversity and genus-level systematics. In order to ascertain the diversity of the group and its phylogeny we have used three nested taxon sampling analyses of the concatenated nDNA/mtDNA datasets an...

We reconstruct the historical biogeography of cichlid fishes endemic to the trans-Andean region of NW South America. DNA sequences were used to study historical biogeography of the cichlid genera Andinoacara (Cichlasomatini) and Mesoheros (Heroini). Two event-based methodological approaches, parsimony-based Statistical Dispersal-Vicariance Analysis...

Phylogenetic relationships among cichlasomatine cichlids were studied using an extensive taxon sampling and both morphological and molecular data sets. A new genus, Andinoacara n. gen. with six species (A. pulcher-rivulatus group of previous authors) from trans-andean South America and NW cis-andean South America, is described based on results of p...

Australoheros Rican and Kullander, 2006 includes four described species - Australoheros facetus (Jenyns, 1842), Australoheros tembe (Casciotta, Gomez & Toresani, 1995), Australoheros scitulus (Rican & Kullander, 2003) and Australoheros kaaygua Casciotta, Almiron & Gomez, 2006. Four additional species are newly described in this paper based on resul...

The European ground squirrel is an endangered rodent whose populations are declining throughout its range. Only in Bulgaria, the genetic hotspot of the species, are some abundant populations still present. We employed 12 microsatellite loci in ten Bulgarian populations to look at population structure, gene flow and recent bottlenecks. We found that...

Bujurquina is the most widely distributed and species-rich genus of cichlids in the western Amazon of South America, yet beyond a few taxonomic studies remains almost completely unknown. We use a newly obtained collection of Bujurquina specimens which for the first time provides a representative sampling throughout its whole distribution area. Base...

Explosive bouts of diversification are one of the most conspicuous features of the tree of life. When such bursts are repeated in similar environments it suggests some degree of predictability in the evolutionary process. We assess parallel adaptive radiation of South American pike cichlids (Crenicichla) using phylogenomics and phylogenetic compara...

The Crenicichla mandelburgeri species complex from the Middle Paraná shows parallel evolution of ecomorphs to the unrelated Crenicichla missioneira species complex from the Uruguay River. In this article, we describe a new species pair (C. sp. Piray Guazú and C. sp. Piray Guazú Line) from the C. mandelburgeri species complex that has evolved a para...

Crenicichla is the largest and most widely distributed genus of Neotropical cichlids. Here, we analyze a mtDNA dataset comprising 681 specimens (including Teleocichla, a putative ingroup of Crenicichla) and 77 out of 105 presently recognized valid species (plus 10 out of 36 nominal synonyms plus over 50 putatively new species) from 129 locations in...

Using molecular dated phylogenies and biogeographic reconstructions, the species diversity, biogeography and time frame of evolution of the genus Herichthys were evaluated. In particular, we test the role of Punta del Morro (PdM) as a vicariant brake along the Mexican Transition Zone in the context of local and global time frame of cichlid diversif...

In the present study we evaluate the putative cases of sympatric speciation in the genus Herichthys by studying the variation of the head shape using principal component analysis, phylomorphospace and reconstructions of the ancestral states of feeding preferences. Herichthys includes both allopatric as well as sympatric sister‐species, as well as s...

Speciation is a multifactorial process with factors acting at different scales of space and time. Trophic niche segregation has promoted the diversification of cichlids fishes in lentic (lacustrine) environments, whether this is also the case in lotic (riverine) systems remains unknown. Herichthys is the genus of cichlids with the most boreal distr...

We address the diversity of two species groups of the cichlid genus Gymnogeophagus in the Middle Paraná basin using molecular phylogeography and traditional morphological characters and conclude that they are composed of a higher diversity of endemic species than previously thought. The nominal Gymnogeophagus setequedas is found non-monophyletic wi...

The Crenicichla mandelburgeri species complex from the Middle Paraná basin is a diverse group of cichlid species and contains all known ecomorphs found within the entire genus Crenicichla. Here, we study the phylogenetic relationships within the C. mandelburgeri species complex using ddRAD sequencing with focus on its two candidate species flocks e...

The Crenicichla mandelburgeri species complex from the Middle Parana´ shows parallel evolution of ecomorphs to the unrelated C. missioneira species complex from the Uruguay River. In this article, we describe a new species from the C. mandelburgeri species complex that has evolved a parallel morphology and ecology to an unrelated species from the C...

Gymnogeophagus jaryi, new species, is described from Southern tributaries of the Middle Paraná basin in Misiones. It can be distinguished from all other members of the genus, except from G. australis and G. caaguazuensis, by the presence of a hyaline to grey anterior portion of the dorsal fin. Gymnogeophagus jaryi differs from G. caaguazuensis by a...

List of material examined. (PDF)

Character matrix used for the phylogenetic analysis. (TNT)

Phylogenetic relationships and molecular species delimitation from BEAST analysis. (PDF)

The Rosalia longicorn (Rosalia alpina) is an internationally protected icon of biodiversity associated with old trees and dead wood. Although the beetle regularly exploits several marginal hosts, its preferred main host is European beech (Fagus sylvatica s.l.). Moreover, the geographical ranges of R. alpina and beech closely overlap. To assess whet...

We provide a review of the systematics of Herichthys by evaluating the usefulness of several mitochondrial and nuclear genetic markers together with morphological data. The nDNA next-generation sequencing ddRAD analysis together with the mtDNA cytochrome b gene provided well-resolved and well-supported phylogenies of Herichthys. On the other hand,...

Gómez-González et al. (2018) have presented specimens which they identify as a new rheophilic morph of Vieja hartwegi (Taylor & Miller, 1980). Below we question this species determination and instead demonstrate that they are most likely natural hybrids of Vieja hartwegi and the syntopic Chiapaheros grammodes (Taylor & Miller, 1980). First, we pres...

Parallel adaptive radiations have arisen following the colonization of islands by lizards and lakes by fishes. In these classic examples, parallel adaptive radiation is a response to the ecological opportunities afforded by the colonization of novel ecosystems and similar adaptive landscapes that favour the evolution of similar suites of ecomorphs,...

The Gymnogeophagus setequedas group is based on our results composed of three endemic species of which one, G. taroba sp. n., is described as a new species. The three species are diagnosable from each other and from other species of Gymnogeophagus by stable differences in several morphological characters among which the best are found in coloration...

The coloration of live specimens of Australoheros guarani is pictured and described for the first time. The species was originally described based on few preserved specimens from two separate tributaries of the Middle Paraná river in Paraguay. Apart from the photos and description of the live coloration of this uncommon species we also elucidate it...

Gymnogeophagus constellatus is registered for the first time from the freshwaters of Argentina, the río Uruguay basin in the province of Misiones. The species was originally described from the río Ijuí and its tributaries in Brazil.

Gymnogeophagus lipokarenos is registered for the first time from Argentina in the Province of Misiones. The species was originally described as endemic to the Upper Uruguay freshwater ecoregion in Brazil. Our findings extend its distribution into the Lower Uruguay ecoregion throughout the province of Misiones.

Sympatry and syntopy are rare among congeneric cichlids in the Neotropics. Among Peruvian Amazonian cichlids congeneric syntopy has so far been reported in only 1 case known from a single locality. Based on thorough exploration of a new locality I refute the syntopy of the 2 species involved: Bujurquina robusta (Kullander, 1986) is a mouth-bay spec...

Unnoticed by the public, initiatives for oil exploration are advanced in Africa’s largest freshwater reservoirs, including Lakes Tanganyika, Malawi and lately Albert, threatening their ecosystems and biota. It is imperative that environmental impact assessments are conducted by independent organizations to ensure that decisions on this matter are b...

Abstract. The aim of this study is to survey the fish fauna of the Iguazu National Park and designate those vulnerable species with special value (EVVES). As a result of this project 104 species were recorded, of which 28 are endemic to the basin and 13 represent new records for Argentina. Finally, 87 species of PNI with special value representing...

As the world’s demands for hydrocarbons increase, remote areas previously made inaccessible by technological limitations are now being prospected for oil and gas deposits. Virtually unnoticed by the public, such activities are ongoing in the East African Great Lakes region, threatening these ecosystems famed for their hyper-diverse biota, includin...

Astyanax xiru is registered for the first time from freshwaters of Argentina in the province of Misiones. This species was found in the Middle río Uruguay basin: arroyo Yaboti-Mini and its affluent arroyo San Juan; arroyos Fortaleza, Oveja Negra and Trigueño, tributaries of the arroyo Yaboti-Guazú; and río Pepirí-Guazú, the only stream in Argentine...

Astyanax xiru is registered for the first time from freshwaters of Argentina in the province of Misiones. This species was found in the Middle río Uruguay basin: arroyo Yaboti-Mini and its affluent arroyo San Juan; arroyos Fortaleza, Oveja Negra and Trigueño, tributaries of the arroyo Yaboti-Guazú; and río Pepirí-Guazú, the only stream in Argentine...

Diapoma pyrrhopteryx is registered for the first time in freshwaters of Argentina, upper río Uruguay basin, in the province of Misiones. This species was found in arroyo Toro, tributary of the río Pepirí Guazú, the only river of Argentina included in the Upper Uruguay freshwater ecoregion. D. pyrrhopteryx is one of 27 endemic fish species known fro...

Five species of Crenicichla have been recorded so far from the lower Iguazú River. Four of them are endemic (members of the C. mandelburgeri species complex from the C. lacustris group) and living in sympatry; the fifth species (C. lepidota) belongs to an Amazon/Orinoco-centered species group (C. saxatilis) and is only distantly related to the rema...

Characidium heirmostigmata and C. serrano are registered for the first time in freshwaters of Argentina in the province of Misiones. Characidium heirmostigmata was found in the middle río Paraná basin and C. serrano in upper and middle río Uruguay basin.

Oligosarcus amome is described from tributaries of the arroyo Yaboti-Guazu, rio Uruguay basin, Misiones Province, Argentina. This new species can be distinguished from all its congeners by the following combination of characters: presence of two conspicuous series of teeth on premaxilla bearing pentacuspidate teeth in the outer series. Oligosarcus...

Rineloricaria reisi, R. stellata, and R. zaina are registered for the first time in freshwaters of Argentina. These three species were found in the Río Uruguay basin in Misiones Province. As a result of these findings, five species of Rineloricaria are found in the Río Uruguay basin in Argentina. A key of Rineloricaria species from that basin is al...

The genus Tatia is recorded for the first time from Argentina in Misiones and Corrientes Provinces. Tatia jaracatia was captured only in the arroyo Deseado, río Iguazú basin, and Tatia neivai has been caught in several streams (tributaries of río Paraná) Piray Guazú, Garuhapé, Tabay, Garupá, and also from the río Paraná in Puerto Nemesio Parma and...

Crenicichla taikyra, new species, is described from the middle río Paraná, Argentina. Crenicichla taikyra is distinguished from the other species of the genus by the following combination of characters: lower pharyngeal tooth plate stout, bearing molariform teeth, ascending arm of premaxilla longer than the dentigerous arm, posterior edge of preope...

Leporinus amae is known from the Rio Apuaê (type locality), Rio Canoas and Rio Caveiras tributaries of the Uruguay River basin, in Brazil. The original description of this species was mainly based on a single specimen lacking intraspecific variation in meristic and morphometric of most characters. We expand the range of distribution and report the...

The theory of classical and cryptic Pleistocene refugia is based mainly on historical changes in temperature, and the refugia are usually defined within a latitudinal gradient. However, the gradient of oceanic-continental climate (i.e. longitudinal) was also significantly variable during glacial cycles with important biotic consequences. Range-wide...

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