Richard Mayden

Richard Mayden
Saint Louis University | SLU · Department of Biology

Ph.D.

About

300
Publications
95,474
Reads
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9,133
Citations
Citations since 2016
46 Research Items
3650 Citations
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
20162017201820192020202120220100200300400500
Additional affiliations
May 2004 - December 2019
Manonmaniam Sundaranar University
Position
  • Professor (Associate)
Description
  • Studies on the inventory and biodiversity of fishes in India
August 2001 - October 2015
Saint Louis University
Position
  • Professor and William S. Barnickle Endowed Chair for Research in the Natural Sciences
July 1987 - July 2001
University of Alabama
Position
  • Professor and Curator

Publications

Publications (300)
Article
Full-text available
North American minnows of the Shiner Clade, within the family Leuciscidae, represent one of the most taxonomically complex clades of the order Cypriniformes due to the large number of taxa coupled with conserved morphologies. Species within this clade were moved between genera and subgenera until the community decided to lump many of the unclassifi...
Article
Five ecologically and phenotypically divergent ecomorphs of the genus Salmo are known from a landlocked alpine lake in the Caucasus, Lake Sevan. It is an example of sympatric diversification within a species-rich lineage with predominate mode of speciation being allopatric. The diversification of Sevan trouts was accompanied by spawning resource pa...
Data
The following supplementary files are included: 1. Figure legends for supplementary figures 2. Fig. S1 Full timetree.pdf 3. Fig. S2. Relationships among five tribes.pdf 4. Table S1. Sample information of the three nuclear datasets 5. Table S2. Sample information of the mitochondrial dataset
Article
Despite the rarity of polyploidy in animals, some groups with polyploid species exhibit complicated and interesting patterns of reticulate evolution. Here we focus on fishes in the subfamily Cyprininae, the largest polyploid group of vertebrates. The large number of polyploid taxa poses significant challenges for phylogenetic and evolutionary studi...
Article
Puntius sensu lato (s.l.) was one of the most speciose genera in the family Cyprinidae. There are around 120 valid species widely distributed in South‐East and South Asia, and South China. Puntius has long been known as an artificial assemblage and ‘catch‐all’ genus in which a large number of small, unrelated cyprinids have been placed. With new sp...
Article
Full-text available
In the remote high-elevation streams and rivers in the northwest of Mexico, there is an endemic and highly diverse group of native trout related to the rainbow trout lineage (Oncorhynchus mykiss). Currently, only two species have been formally described from this trout complex, the Mexican golden trout, O. chrysogaster, and the San Pedro Mártir rai...
Article
Full-text available
The Cypriniformes comprise approximately 4,200 species accounting for 25% of the diversity of all freshwater fish, which is widely distributed across the world’s continents except Antarctica, South America, and Australia. The highest species diversity is found in Southeastern Asia. Despite its remarkable species diversity and broad-scale geographic...
Data
Schonhuth et al-2018. Phylogeography of the widespread creek chub Semotilus!atromaculatus (Cypriniformes: Leuciscidae). Journal of Fish Biology 93: 778-791. Table S1 (Appendix): List of specimens analyzed for this study, indicating the number of specimens examined per gene for each locality, sampling locality, Tissue#, and catalog number for vouche...
Article
Full-text available
Sevan trout, Salmo ischchan, dwelling in the mountain Lake Sevan (Caucasus) is a unique species complex. Four sympatric forms of Sevan trout were divergent in both their phenotypes and ecologies. Three forms were lacustrine spawners but were unique in their spawning times and the type of substrate. The fish community of Lake Sevan was strongly impa...
Article
The extent and nature of genetic differentiation in Semotilus atromaculatus, one of the most abundant and widespread leuciscids in North America, were evaluated based on mitochondrial (mt) and nuclear DNA sequence variation. Phylogenetic relationships were first inferred based on a fragment of the cytochrome b (cytb) region and the nuclear intron s...
Article
Full-text available
Catostomidae (“suckers”) is a diverse (76 species) and broadly distributed family of Holarctic freshwater fishes with a rich fossil record and a considerable number (∼35%) of threatened and imperiled species. We integrate DNA sequences (three mitochondrial genes, three nuclear genes), morphological data, and fossil information to infer sucker phylo...
Data
Appendix S1. Catostomidae fossils, fossil and external calibration age priors, and additional discussion of phylogenetic relationships within the Catostominae.
Data
Fig. S9. Probabilities of different character sets inferring the correct topology, a polytomy, or the incorrect topology (‘phylogenetic noise’) over the period of sucker subfamily divergence. The period investigated is the ‘subfamily divergence epoch’ (SDE; ∼63.16–34.37 Ma) in our time tree. The SDE defines an internode distance, t0, used in the pr...
Data
Fig. S3. MrBayes consensus tree derived from the morphology dataset.
Data
Fig. S5. MrBayes consensus tree derived from the nuclear IRBP dataset.
Data
Fig. S6. MrBayes consensus tree derived from the concatenated nDNA dataset.
Data
Fig. S7. Posterior density plots of BEAST ‘ucldStdev’ and ‘coefficient of variation’ statistics demonstrating significant among-lineage rate heterogeneity in the total-evidence dataset. Problematic mtDNA 1st and 3rd codon sites were excluded from the analysis.
Data
Table S1. Data subsets and corresponding DNA substitution models selected in PartitionFinder for the four-locus dataset. Model selection analyses using PartitionFinder v1.1.1 supported different best-fit models of DNA evolution for different data subsets (i.e. groups or ‘blocks’ of data, such as sites filtered by codon positions). When it was not p...
Data
Fig. S1. MrBayes consensus tree derived from the concatenated mtDNA dataset.
Data
Fig. S2. MrBayes consensus tree derived from the mtDNA + morphology dataset.
Data
Fig. S4. MrBayes consensus tree derived from the four-locus dataset.
Data
Fig. S8. Variation in substitution rates among sites. This figure plots variation in substitution rates among sites, based on posterior distributions of the gamma shape parameters (alpha estimates) assigned to different data subsets in BEAST (excluding problematic mtDNA 1stand 3rd codon position sites).
Article
The phylogenetic relationships and classification of the freshwater fish order Cypriniformes, like many other species-rich groups of vertebrates, has evolved over time with some consistency and inconsistencies of relationships across various studies. Within Cypriniformes, the Holarctic family Leuciscidae is one of the most widely distributed and hi...
Article
The North American fish genus Macrhybopsis (Teleostei: Cyprinidae) as presently conceived comprises 12 species and occurs in much of interior eastern North America. Variation in the mitochondrial ND2 gene and the nuclear S7 intron 1 reveal conflicting gene-tree relationships for deeper nodes, which are assumed to represent past introgression and he...
Article
Full-text available
The phylogeny of otocephalan fishes is the subject of broad controversy based on morphological and molecular evidence. The primary unresolved issue pertaining to this lineage relates to the origin of Characiphysi, especially the paraphyly of Characiformes. The considerable uncertainty associated with this lineage has precluded a greater understandi...
Article
Full-text available
Fish species of the genus Capoeta are known for their special mouth morphology (inferior mouth with the horny edge to the lower jaw), short dorsal fin with seven to nine branched rays, and their tumultuous taxonomic history. The genus Capoeta has had a complex evolutionary history with high diversification in the Middle East and is closely related...
Article
For many years the North American cyprinid fish Macrhybopsis aestivalis (common name: Speckled Chub) was regarded as a single widespread and morphologically variable species, occurring in rivers throughout much of the Mississippi Val-ley and geographically adjacent eastern Gulf slope drainages, west to the Rio Grande basin in Texas, New Mexico, and...
Article
Full-text available
Gene choice, base compositional heterogeneity and rate heterogeneity are known to influence phylogenetic reconstruction but are often overlooked. Here, we investigate the impact of these factors in reconstructing the phylogenetic relationships and divergence times of cypriniform fishes. We compile a multilocus data set of newly sequenced and previo...
Article
Full-text available
A new cyprinid fish, Hypselobarbus kushavali, is described from Kali River, Karnataka, India. Hypselobarbus kushavali is diagnosed from its closest congener, H. dobsoni, by having more upper transverse scale rows, more circumferential scale rows and more lateral line to pelvic scale rows, and from H. bicolor and H. jerdoni by having fewer lateral-l...
Article
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...
Article
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...
Article
This study represents a phylogenetic analysis of Pimephales notatus, a widely distributed North American cyprinid fish species, using one mitochondrial (cytb) and two nuclear (S7 and Rag1) genes. Despite the broad geographic distribution of this species that includes independent basins, results suggest a largely drainage-independent genetic structu...
Article
Full-text available
Identifying areas at risk of invasion can be difficult when the distribution of a non-native species encompasses geographically disjunct regions. Understanding genealogical relationships among native and non-native populations can clarify the origins of fragmented distributions, which in turn can clarify how fast and far a non-native species may sp...
Article
Sisorid catfishes are primarily limited in distribution to rivers of the Himalayan region and Tibetan Plateau. These species have external morphologies that are adapted for extremely fast-flowing riverine systems. Given the diversity of the group and the above qualities of these catfishes, this lineage serves as an ideal group for inferring the geo...
Article
Full-text available
Pacific trout Oncorhynchus spp. in western North America are strongly valued in ecological, socioeconomic, and cultural views, and have been the subject of substantial research and conservation efforts. Despite this, the understanding of their evolutionary histories, overall diversity, and challenges to their conservation is incomplete. We review t...
Article
Full-text available
Meristic and morphometric analyses and comparisons were conducted between an undescribed sucker of Río Culiacán (Catostomus sp.) and a Yaqui sucker (Catostomus bernardini) from the rivers Yaqui, Fuerte and Conchos in the Sierra Madre Occidental. A discriminant function analysis based on 44 characters (37 morphometric and 7 meristic) of 96 adult spe...
Article
Full-text available
Phylogenetic relationships within Labeobarbus, the large-sized hexaploid cyprinids, were examined using cytochrome b gene sequences from a broad range of geographic localities and multiple taxa. Maximum likelihood and Bayesian methods revealed novel lineages from previously unsampled drainages in central (Congo River), eastern (Genale River) and so...
Article
African diploid barbs (‘Barbus’, Clypeobarbus, Barboides, etc.) are a group of small cyprinids with a body size less than 20 cm and widely distributed in drainages across Africa. These species constitute a significant component of African freshwater fish fauna. This study is the first to focus on the molecular systematics and biogeography of Africa...
Article
Hypselobarbus kurali (Menon & Rema Devi, 1995) consists of multiple species with similarity in the color pattern of the tip of their caudal fins being orange and black. This complex of species possesses two pairs of barbels. Inspection of collections of H. kurali from the senior author’s samples from various streams/rivers of Western Ghats covering...
Article
This study represents a thorough analysis of Codoma, a monotypic genus endemic to north-western Mexico. A previous morphological analysis of the species concluded that there exists several morphological groups in Codoma ornata, suggesting diversity in Codoma could be underestimated. No studies have examined the genetic diversity in Codoma ornata to...
Article
Full-text available
Salmonid fishes are cold water piscivores with a native distribution spanning nearly the entire temperate and subarctic northern hemisphere. Trout in the genus Oncorhynchus are the most widespread salmonid fishes and are among the most important fish species in the world, due to their extensive use in aquaculture and valuable fisheries. Trout that...
Article
Full-text available
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...
Article
Full-text available
The cyprinid genus Pteronotropis is endemic to southeastern Gulf of Mexico and Atlantic Ocean of North America. Never before has the genus been demonstrated to be monophyletic. We investigate both the phylogenetic relationships and the phylogeography of some species in the genus using mitochondrial ND2 sequences. In no analysis is the genus resolve...
Article
Full-text available
The genus Pteronotropis is widely distributed along the gulf slope of eastern North America from Louisiana to Florida and rivers in South Carolina along the Atlantic slope. Pteronotropis have very distinctive, flamboyant coloration. The habitats most frequently associated with these species include heavily vegetated backwater bayous to small sluggi...
Article
Full-text available
Cyprininae is the largest subfamily (>1300 species) of the family Cyprinidae and contains more polyploid species (∼400) than any other group of fishes. We examined the phylogenetic relationships of the Cyprininae based on extensive taxon, geographical, and genomic sampling of the taxa, using both mitochondrial and nuclear genes to address the phylo...
Article
Full-text available
Sinocyclocheilus brevifinus sp. nov. is described from a subterranean river at Maohedong Village, Guangxi Zhuang Autonomous Region, Southern China. The new species can be distinguished from all congeners in having functional eyes, last simple dorsal fin ray soft and without serrations along posterior margin, eye diameter small (3.4-5.0 %SL), tip of...
Article
Full-text available
The Mexican native trout complex is the group of salmonids that naturally has the southernmost distribu-tion in the world. Despite its unique status and evidence of more than 13 distinct lineages, there are only two described species (Oncorhynchus mykiss nelsoni and O. chrysogas-ter). These fishes are threatened by environmental and anthropogenic f...
Article
Full-text available
The Acanthomorpha is the largest group of teleost fishes with about one third of extant vertebrate species. In the course of its evolution this lineage experienced several episodes of radiation, leading to a large number of descendant lineages differing profoundly in morphology, ecology, distribution and behavior. Although Acanthomorpha was recogni...
Article
AimAny discovery of new biogeographical pattern in landlocked animals may challenge hypotheses that account for the evolution of intercontinental faunas. In this study, we examined the evolutionary origin and historical biogeography of temperate, freshwater perch-like fishes within a molecular phylogenetic framework.LocationTemperate Eastern Eurasi...