Torben Stemme

Torben Stemme
Ulm University | UULM · Institute of Neurobiology

Dr. rer. nat.

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34
Publications
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317
Citations

Publications

Publications (34)
Article
Full-text available
Within arthropods, the investigation of navigational aspects including homing abilities has mainly focused on insect representatives, while other arthropod taxa have largely been ignored. As such, scorpions are rather underrepresented concerning behavioral studies for reasons such as low participation rates and motivational difficulties. Here, we r...
Article
Full-text available
The pectines of scorpions are comb-like structures, located ventrally behind the fourth walking legs and consisting of variable numbers of teeth, or pegs, which contain thousands of bimodal peg sensillae. The associated neuropils are situated ventrally in the synganglion, extending between the second and fourth walking leg neuromeres. While the gen...
Article
Full-text available
Many arachnid taxa have evolved unique, highly specialized sensory structures such as antenniform legs in Amblypygi (whip spiders), for instance, or mesosomal pectines in scorpions. Knowledge of the neuroanatomy as well as functional aspects of these sensory organs is rather scarce, especially in comparison to other arthropod clades. In pseudoscorp...
Article
Full-text available
Scorpions' sensory abilities are intriguing, especially the rather enigmatic ventral comb-like chemo- and mechanosensory organs, the so-called pectines. Attached ventrally to the second mesosomal segment just posterior to the coxae of the fourth walking leg pair, the pectines consist of the lamellae, the fulcra, and a variable number of pecten teet...
Article
While insect locomotion has been intensively studied, there are comparably few studies investigating octopedal walking behaviour, and very little is known about pseudoscorpions in particular. Therefore, we performed an extensive locomotion analysis during forward, backward and upside down walking in the cosmopolitan pseudoscorpion Chelifer cancroid...
Article
Full-text available
Despite numerous approaches to the resolution of euarthropod phylogeny, mainly based on modern sequenceinformation and traditional external morphology, the resulting hypotheses are often contradictory and leave manyquestions about euarthropod evolution unanswered. The comparison of developmental and structural aspects ofthe nervous system has shown...
Article
Full-text available
Background Given the numerous hypotheses concerning arthropod phylogeny, independent data are needed to supplement knowledge based on traditional external morphology and modern molecular sequence information. One promising approach involves comparisons of the structure and development of the nervous system. Along these lines, the morphology of sero...
Article
The ventral nerve cord of Tetraconata contains a comparably low number of serotonin-immunoreactive neurons, facilitating individual identification of cells and their characteristic neurite morphology. This offers the rather unique possibility of establishing homologies at single cell level. Since phylogenetic relationships within Tetraconata are st...
Article
Full-text available
Background While a number of neuroanatomical studies in other malacostracan taxa have recently contributed to the reconstruction of the malacostracan ground pattern, little is known about the nervous system in the three enigmatic blind groups of peracarids from relict habitats, Thermosbaenacea, Spelaeogriphacea, and Mictocarididae. This first detai...
Chapter
Serotonin immunostaining is a widely used method not only in neuroanatomy but also in developmental and evolutionary biology over a wide range of animal phyla. In such phylogenetic or developmental analyses, the complete set of serotonergic neurons and their major branching patterns need to be visualized. Here, established standard staining methods...
Article
Full-text available
The Remipedia have been proposed to be the crustacean sister group of the Hexapoda. These blind cave animals heavily rely on their chemical sense and are thus rewarding subjects for the analysis of olfactory pathways. The evolution of these pathways as a character for arthropod phylogeny has recently received increasing attention. Here, we investig...
Poster
A close phylogenetic relationship of Crustacea and Hexapoda is now widely accepted, however the identity of the crustacean sister group to Hexapoda still remains elusive. Numerous, often contradicting, hypotheses have been postulated based on different kinds of analyses, such as morphological comparisons and molecular sequencing information. Anothe...
Article
The neuroanatomy of the olfactory pathway has been intensely studied in many representatives of Malacostraca. Nevertheless, the knowledge about bilateral olfactory integration pathways is mainly based on Decapoda. Here, we investigated the olfactory projection neuron pathway of two marine isopod species, Saduria entomon and Idotea emarginata, by li...
Article
Full-text available
Background Remipedia were initially seen as a primitive taxon within Pancrustacea based on characters considered ancestral, such as the homonomously segmented trunk. Meanwhile, several morphological and molecular studies proposed a more derived position of Remipedia within Pancrustacea, including a sister group relationship to Hexapoda. Because of...
Article
Full-text available
Background Remipedia, a group of homonomously segmented, cave-dwelling, eyeless arthropods have been regarded as basal crustaceans in most early morphological and taxonomic studies. However, molecular sequence information together with the discovery of a highly differentiated brain led to a reconsideration of their phylogenetic position. Various co...
Article
Full-text available
Remipedia is one of the most recently discovered classes of crustaceans, first described in 1981 from anchialine caves in the Bahamas Archipelago. The class is divided into the order Enantiopoda, represented by two fossil species, and Nectiopoda, which contains all known extant remipedes. Since their discovery, the number of nectiopodan species has...
Article
Higher-level arthropod phylogenetics is an intensely active field of research, not least as a result of the hegemony of molecular data. However, not all areas of arthropod phylogenetics have so far received equal attention. The application of molecular data to infer a comprehensive phylogeny of Crustacea is still in its infancy, and several emergin...

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Projects (3)
Project
We're observing behavioral characteristics of the homing response, including methods of stimulating the return to the burrow, locomotor patterns, and means of navigation and orientation. Furthermore, we are developing and improving upon methods of measuring scorpion locomotory behavior.
Project
Our goal is gathering all published information in as many languages as possible on in order to produce an open access database that facilitate future research in subterranean aquatic environments. Data will be gather for all groups of animals. The geographical scope is global, and it covers all types of so-called subterranean habitats ranging from freshwater and marine caves to hyporheic and interstitial environments. The project is part of the MSCA-IF-2016 "ANCAVE: Anchialine caves to understand evolutionary processes" granted to Alejandro Martinez and hosted by Diego Fontaneto (IRSA-CNR, Verbania).
Project
Neuroanatomical and behavioral studies to unravel the chemosensory system of scorpions