2. Behavioral Biology TALKS - Deutsche Zoologische Gesellschaft

using immunohistochemistry and confocal laser scan microscopy. Previous studies
have shown that in the course of isopods? terrestrialization the first antennae have
been greatly reduced with a concomitant reduction of corresponding neuronal
substrate. In contrast, marine isopods such as Saduria entomon still possess well
developed first antennae and defined olfactory centers. These centers are divided
into spherical neuropil compartments, the olfactory glomeruli, which a clustered into
distinct groups. Additional structures that we describe in gretater detail include the
optic neuropils and the central complex. We discuss our findings with regard to brain
morphology in the ground pattern of malacostracan crustaceans.
Supported by DFG Ha 2540/9-1.
����122 Verena Kutschera
Is there a coxa in malacostracanpleopods?
Authors: Verena Kutschera 1 , Ina Schmidt 1 , Andreas Maas 1 , Dieter Walsozek 1
Affiliation: 1 Biosystematic Documentation, University of Ulm
Malacostraca is a species-rich taxon of crustaceans, characterised by a unique
tagmosis: the head comprises five appendage-bearing segments and is followed by a
subdivided trunk (thorax): Thorax I consists of eight segments each carrying a pair of
so-called thoracopods, each built of a basal coxa and a basipod distal to it, which
carries the two rami, endopod and exopod. Thorax II comprises six segments bearing
limbs, which seem to consist only of basipod, endopod, and exopod. The body is
completed by the telson posteriorly, basically carrying a pair of furcal rami. We
examined the pleopods of representatives of various malacostracan taxa via staining
with alizarin, which tinges calcified parts of the cuticle purple while non-calcified,
membranous parts remain white. By this we were able to detect several small
sclerites in the membrane of the limb-body articulation of these species. Most of the
sclerites correspond to each other in relative position to the basipod and shape and
have internal apodemes where muscles can attach. This conserved morphology
allows the hypothesis that these sclerites might be remains of a coxa also in the
pleopods, with this contradicting previous assumptions.
����123 Tobias Lehmann
Retinula axons and visual neuropils of the median and lateral eyes of Euscorpius
italicus (Herbst, 1800) (Scorpiones: Euscorpiidae)
Authors: Tobias Lehmann 1 , Roland R. Melzer 1
Affiliation: 1 Zoologische Staatssammlung München
Lately sets of neuroanatomical characters have contributed important arguments to
the discussion about the phylogeny of Arthropoda. Especially the visual system of
Arthropods is well studied, which is underlined by the Tetraconata concept
(Crustacea + Insecta), where the structure of the eyes is eponymous. In contrast the
visual system of Scorpiones is studied so far only in a neurophysiological context, and
no morphological features are described to date making the visual system accessible
for a phylogenetic comparison.
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