Jörn Köhler

Jörn Köhler
Hessisches Landesmuseum Darmstadt · Zoology

Dr. rer. nat.

About

257
Publications
156,070
Reads
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5,040
Citations
Citations since 2017
40 Research Items
2209 Citations
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20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
20172018201920202021202220230100200300400
Additional affiliations
March 2001 - February 2005
Research Museum Alexander Koenig
Position
  • Scientific Coordinator BIOTA East Africa
Description
  • Interdisciplinary biodiversity research project coordinated by ZFMK and funded by German Ministry of Education and Research (BMBF).
October 1997 - May 2000
Research Museum Alexander Koenig
Position
  • PhD Student
Description
  • Dissertation on amphibian diversity patterns in Bolivian montane forests.

Publications

Publications (257)
Article
Full-text available
Malagasy frogs of the subgenus Brygoomantis in the mantellid frog genus Mantidactylus currently comprise 14 described species of mostly brown, riparian frogs. Data from DNA barcoding suggested that the diversity of this subgenus is dramatically underestimated by current taxonomy. We here provide a comprehensive revision of this subgenus. We use hyb...
Technical Report
We discuss taxonomic name patronage and how such has popularized a recent discovery published in Vol. 164 of Tijdschrift voor Entomologie (TvE) along with some comments on current and forthcoming articles of TvE.
Article
Full-text available
The taxonomic status of the strabomantid frog species Pristimantis nebulosus (Henle, 1992), originating from the southern Cordillera Azul in central Peru, is investigated based on examination of the holotype and its comparison with freshly collected topotypic material. Following current standards, we provide a redescription of the holotype. It is i...
Article
Full-text available
The subgenus Laurentomantis in the genus Gephyromantis contains some of the least known amphibian species of Madagascar. The six currently valid nominal species are rainforest frogs known from few individuals, hampering a full understanding of the species diversity of the clade. We assembled data on specimens collected during field surveys over the...
Article
Full-text available
Mantellid frogs of the Madagascar-endemic Gephyromantis plicifer complex consist of three nominal species (G. luteus, G. plicifer and G. sculpturatus) as well as several genetically divergent lineages (candidate species), but uncertainties surround the identity of the name-bearing types of all three established nomina. We applied laboratory techniq...
Article
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We report anti-predator behavior of an individual of Cruziohyla craspedopus found at Panguana, Departamento Huánuco, Peru. It constitutes the first record of the species for this private protected area and central Peru.
Article
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New genetic, bioacoustic and morphological data on green-coloured Boophis treefrogs from eastern Madagascar reveal an additional level of cryptic diversity in these frogs. Two candidate species, Boophis sp. Ca36 and Ca37, are closely related to each other and to B. sandrae, with uncorrected pairwise distances in the mitochondrial 16S rRNA gene as l...
Article
Full-text available
We studied the status of toads of the genus Rhinella collected in the southern Cordillera Azul, central Peru. Molecular analysis of the mitochondrial 16S rRNA gene revealed them to be members of the recently proposed Rhinella festae species group, and sister to R. lilyrodriguezae, a species known from northern areas of the Cordillera Azul. The new...
Article
The genus Scaphiophryne (Anura: Microhylidae) contains at least nine species that, together with their probable sister genus Paradoxophyla, form the Madagascar-endemic subfamily Scaphiophryninae. Scaphiophryne are robust burrowing frogs with explosive breeding behavior and are characterized by a unique larval morphology, being intermediate between...
Article
Full-text available
The Paroedura bastardi clade, a subgroup of the Madagascan gecko genus Paroedura, currently comprises four nominal species: P. bastardi, supposedly widely distributed in southern and western Madagascar, P. ibityensis, a montane endemic, and P. tanjaka and P. neglecta, both restricted to the central west region of the island. Previous work has shown...
Article
Full-text available
Evolutionary reduction of adult body size (miniaturization) has profound consequences for organismal biology and is an important subject of evolutionary research. Based on two individuals we describe a new, extremely miniaturized chameleon, which may be the world’s smallest reptile species. The male holotype of Brookesia nana sp. nov. has a snout–v...
Article
Full-text available
Taxonomic progress is often hindered by intrinsic factors, such as morphologically cryptic species that require a broad suite of methods to distinguish, and extrinsic factors, such as uncertainties in the allocation of scientific names to species. These uncertainties can be due to a wide variety of factors, including old and poorly preserved type s...
Article
Full-text available
Zoologists have widely acknowledged the utility of classification systems for characterising variation in anuran egg and clutch types, tadpole morphotypes, embryonic and tadpole development, amplexus types and reproductive modes. These classification systems have facilitated unambiguous communication between researchers, often working in completely...
Article
Full-text available
We describe a new species of arboreal microhylid frog, genus Platypelis , from northeastern Madagascar and report the expansion of distribution ranges of two other species. Platypelis laetussp. nov. is small to medium-sized (24.3–25.6 mm snout-vent length) compared to other Platypelis , exhibits a greenish colored throat and was found in bamboo for...
Article
Full-text available
We studied the genetic variability of Platypelis species (Anura: Microhylidae) with red flash marks from Madagascar based on mitochon-drial (16S rRNA) and nuclear (RAG1) genes. Our molecular phylogenetic results suggest that the red colour evolved independently in the Platypelis barbouri complex and P. milloti and confirm the validity of a long-kno...
Article
Full-text available
Taxonomy is the cornerstone of extinction risk assessments. Currently, the IUCN Red List treats species complexes either under a single overarching species name—resulting in an unhelpfully broad circumscription and underestimated threat assessment that does not apply to any one species lineage—or omits them altogether—resulting in the omission of s...
Article
Full-text available
We describe a new species of arboreal narrow-mouthed frog, genus Platypelis, from Ambodivoangy near Maroantsetra in northeastern Madagascar. The new species, Platypelis ando sp. nov., is characterised by small body size (under 19 mm), a generally rather slender body, yellowish finger and toe tips, and a dark brown dorsal chevron. Its advertisement...
Article
Full-text available
We describe the new gecko species Paroedura neglecta sp. n. from the Tsingy de Bemaraha National Park in western Madagascar, belonging to the P. bastardi/tanjaka clade. The species in this clade are characterized by three light dorsal crossbands on the dorsum of juveniles and subadults whereas all other Paroedura species have four such bands. The n...
Article
Full-text available
We describe a new species of dwarf chameleon from the Brookesia minima species group. Brookesia tedi sp. n. occurs above 1300 m above sea level on the Marojejy massif in northeastern Madagascar. It is genetically sister to B. peyrierasi, a species occurring in lowlands around the Baie de Antongil, but is genetically strongly divergent from that spe...
Article
Full-text available
We describe three new gecko species of the Paroedura oviceps clade, diagnosed by deep divergences in mitochondrial DNA, absence of haplotype sharing in two nuclear genes (sacs and kiaa1239), and morphological differences. Paroedura spelaea sp. nov. is an extremely slender species from karst habitats in the limestone massif of the Tsingy de Bemaraha...
Chapter
Full-text available
The origins of the zoological collections of the Hessische Landesmuseum Darmstadt (HLMD) are rather old and can be traced back to the early eighteenth century. In past times, it was mainly two curators responsible for the growth of the collection, namely, Johann Jakob Kaup (1803–1873) and Gottlieb von Koch (1849–1914). The latter was involved in th...
Article
Full-text available
The genus Stumpffia Boettger, 1881 currently contains 15 named, small to miniaturized frog species, classified in the endemic Malagasy subfamily Cophylinae of the family Microhylidae. Stumpffia are terrestrial frogs with a largely unknown biology, probably due to their small size and secretive habits. Previous studies have suggested a large proport...
Poster
Full-text available
Tadpoles exhibit a huge diversity of morphological characters. However, amphibian research still primary aims at adults and information on tadpoles is often scarce. In scientific (museum) collections, tadpoles are often disregarded and barely processed and thus are ‘hidden treasures’ to scientific research. The phylogenetic and geographic distribut...
Article
Full-text available
We present molecular evidence for the presence of two species morphologically similar to Spinomantis bertini in Andohahela National Park, south-eastern Madagascar, differing by 5.5−6.3% pairwise DNA sequence divergences in the mitochondrial 16S rRNA gene. One of these was observed at higher elevations of ca. 1650 m above sea level, whereas the othe...
Article
Full-text available
The taxonomy of the Cophylinae Cope (Anura: Microhylidae) has been recently debated: PELOSO et al. (2016) reconstructed the subfamily as having two paraphyletic genera, and proposed to synonymize Stumpffia with Rhombophryne, and Platypelis with Cophyla. SCHERZ et al. (2016) showed that PELOSO et al. (2016) had misidentified several taxa, and contes...
Article
Full-text available
We describe and name Phyllomedusa chaparroi sp. nov., a medium-sized species (snout–vent length in adult males 67.9–77.5 mm) of monkey frog from Amazonian rainforests of northern Peru. Although morphologically most similar to P. boliviana and P. camba (indistinguishable from the latter in external qualitative and quantitative traits), phylogenetic...
Article
Full-text available
Vocalizations of anuran amphibians have received much attention in studies of behavioral ecology and physiology, but also provide informative characters for identifying and delimiting species. We here review the terminology and variation of frog calls from a perspective of integrative taxonomy, and provide hands-on protocols for recording, analyzin...
Article
Full-text available
We integrate molecular, bioacoustic and morphological data to provide a systematic revision of the frogs classified in the Gephyromantis asper clade (Anura: Mantellidae), endemic to Madagascar. Based on concordant differentiation in a mitochondrial and a nuclear gene (16S rRNA and Rag1) we distinguish six different species in this clade: G. ambohit...
Article
Full-text available
The gecko genus Geckolepis, endemic to Madagascar and the Comoro archipelago, is taxonomically challenging. One reason is its members ability to autotomize a large portion of their scales when grasped or touched, most likely to escape predation. Based on an integrative taxonomic approach including external morphology, morphometrics, genetics, pholi...
Data
Rotational video of the skull of Geckolepis maculata (ZMB 9655)
Data
Rotational video of the skull of Geckolepis of OTU AB (ZSM 1520/2008)
Data
Supplementary information The type locality of Geckolepis maculata Peters, 1880
Data
Variable osteological characters among specimens of Geckolepis examined.
Data
Rotational video of the skull of Geckolepis megalepis sp. nov. (ZSM 2126/2007)
Data
Rotational video of the skull of Geckolepis humbloti (ZSM 80/2010)
Data
Measurements and meristics of the specimens examined for this study
Data
Stereoscopic 3D renderings of the skull of the holotype of Geckolepis megalepis sp. nov. in anterolateral and dorsal view
Data
Rotational video of the skull of Geckolepis humbloti (ZSM 81/2006)
Article
Full-text available
We report the discovery of a new singleton species of Oreobates Jiménez de la Espada, 1872, from the Yungas forest of the Amazonian versant of the Andes in Bolivia, infer its phylogenetic position, revisit the phylogenetic relationships of Oreobates, and discuss the conditions that justify description of the species with a single specimen. The new...
Article
Full-text available
In a previous study, Miralles & Vences (2013) compared seven different methods of species delimitation applied to the genus Madascincus. While focusing on methodological aspects their study involved an extensive data set of multilocus DNA sequences and of comparative morphology. On this basis they emphasized the need of revising the taxonomy of Mad...
Article
Full-text available
The question whether taxonomic descriptions naming new animal species without type specimen(s) deposited in collections should be accepted for publication by scientific journals and allowed by the Code has already been discussed in Zootaxa (Dubois & Nemésio 2007; Donegan 2008, 2009; Nemésio 2009a–b; Dubois 2009; Gentile & Snell 2009; Minelli 2009;...
Data
This plot is not part of the published stance but derives from it. The plot shows the number of authors by geographic region (courtesy of Dr. Diego Astua).
Article
A recent study clarified several aspects of microhylid phylogeny by combining DNA sequences from Sanger sequencing and anchored phylogenomics, although numerous aspects of tree topology proved highly susceptible to data partition and chosen model. Although the phylogenetic results of the study were in conflict with previous studies, the authors mad...
Article
Full-text available
In this study, we provide an extended multilocus phylogenetic analysis combining mitochondrial and nuclear DNA of a group of fossorial and miniaturized legless lizards (genus Paracontias) from Madagascar, including the description of two species new to science, P. ampijoroensis sp. nov. and P. mahamavo sp. nov. Our analyses revealed the existence o...
Article
Full-text available
We describe a new species of arboreal frog of the genus Guibemantis, subgenus Guibemantis, from low altitude rainforest in Manombo Special Reserve, south-eastern Madagascar. Previously published phylogenetic analyses of mitochondrial DNA sequences have placed Guibemantis diphonus sp. nov. sister to G. timidus. The new species is distinguished from...
Article
Full-text available
Molecular genetic studies have in recent years revealed the presence of hidden species diversity in Madagascar's amphibians , and numerous genera contain candidate species awaiting description. We here revise the taxonomy of one such genus within the endemic Malagasy-Comorian family Mantellidae. The target taxon, Aglyptodactylus, is classified in t...
Book
Full-text available
The conservation of Madagascar amphibians has become object of study and application in the last twenty years, and concomitant to the presence and action of several herpetologists, who take this discipline to Madagascar, and highlighted the importance of preparing a serious action plan. Until then, taxonomy and survey works were the main activities...
Chapter
Full-text available
The zoogeographical dioramas of the Hessisches Landesmuseum Darmstadt, Germany, are unique in their design concepts. They are also amongst a very few in Europe that, aside from repairs of war-induced damages, are still in the same condition as when they were originally set up at the beginning of the twentieth century. They have, however, suffered w...
Chapter
Full-text available
The dioramas of the Hessisches Landesmuseum Darmstadt had been already included in the plans for the new building of the museum at the end of the 19th century. The preparation of the taxidermy specimens was based on sketches taken from nature and zoo animals and also by the use of miniature prototypes. The first groups were available to the public...
Chapter
Full-text available
The zooglogical dioramas of the Hessisches Landesmuseum Darmstadt, Germany, are unique in their design concepts. They are also amongst a very few in Europe that, aside from repairs of war-induced damages, are largely in the same condition as when they were originally set up at the beginning of the 20th century. They have, however, suffered wear and...
Article
Full-text available
Paroedura hordiesi sp. n. is described from Montagne des Français, a karstic limestone massif in the far north of Madagascar recently established as nature reserve. The new species has the nostril in contact with the rostral scale and shares many characters with P. karstophila and especially with P. homalorhina which are also restricted to karstic...
Article
Full-text available
Species distributed across vast continental areas and across major biomes provide unique model systems for studies of biotic diversification, yet also constitute daunting financial, logistic and political challenges for data collection across such regions. The tree frog Dendropsophus minutus (Anura: Hylidae) is a nominal species, continentally dist...
Article
Full-text available
Zusammenfassung Die zoologischen Dioramen des Hessischen Landesmuseums Darmstadt sind hinsichtlich ihres Gestaltungs-konzepts einzigartig. Sie gehören zudem zu den wenigen Dioramen in europäischen Museen, welche ab-gesehen von reparierten Kriegsschäden seit ihrer Erstellung zu Beginn des 20. Jahrhunderts nahezu unverändert geblieben sind. Dennoch h...