2. Behavioral Biology TALKS - Deutsche Zoologische Gesellschaft

����118 Katja Jaszkowiak
The mouthpart apparatus of Lithodesmaja - functional morphology and evolution
Authors: K. Jaszkowiak 1 , J. Keiler 1 , C. S. Wirkner 1 , S. Richter 1
Affiliation: 1 Allgemeine und Spezielle Zoologie, Institut für Biowissenschaften,
Universität Rostock
Within crustaceans, decapods are one of the species-richest groups. Being able to
utilize many different food resources is probably an important aspect of their
success. This phenomenon is facilitated by their complex mouthpart apparatus,
which is able to perform various movements including transporting, aligning, crushing
and cutting and processes sensory information from the food before it is swallowed.
Although the main set of mouthparts is the same in many species, differences in form
and function have evolved according to lifestyle. Studies into the functional
morphology of mouthparts have already been carried out for some decapod species,
and to complement the available taxon sampling a species of the hitherto unstudied
king crabs (Lithodidae), Lithodes maja, was analyzed here. Individuals were filmed
while being presented with different kinds of food. To obtain structural information
on the individual mouthpart elements in their natural position to one another, the
mouthparts were 3D-reconstructed from micro- CT scans. These data were
complemented by scanning electron microscopy, permitting the surface structures,
such as setae, to be analyzed in detail. As indicated by studies into other species,
there is evidence that the mouthparts of Lithodes maja can be sorted into functional
groups. By analyzing movement patterns six of these groups could be found: 1
transporting mouthparts, 2 aligning/sorting mouthparts, 3 clutching/holding
mouthparts, 4 tearing/cutting/crushing mouthparts, 5 current-generating
mouthparts, and 6 grooming mouthparts. According to the 3D reconstruction there
seem to be differences in morphology and relative position - which might implicate
functional differences - between the mouthparts of Lithodes maja and those of even
closely related species. The data presented is discussed in comparison to data from
the literature to create a picture of the evolutionary transformations undergone by
the functional feeding apparatus in decapod crustaceans.
����119 Johanna Kaidel
The morphology of the female postabdomen of Apachyuschartaceus (Insecta:
Dermaptera: Apachyidae)
Authors: Johanna Kaidel 1 , Klaus-Dieter Klass 1
Affiliation: 1 Senckenberg Natural History Collections Dresden, Museum of Zoology
The probed species Apachyus chartaceus (de Haan, 1842) is one of 15 species,
belonging to the higher dermapteran family Apachyidae. Because of its similar wing
structures and reproductive organs, this palaeotropical earwig is thought to be close
to the basal" Dermaptera (Jarvis et al. 2004). On the contrary, Klass (2001) mentions
the chance of a relation between the highly derived Hemimeridae and Apachyidae. In
order to solve this conflict the morphological investigation of the female
postabdomen of A. chartaceus was undertaken, focussing on its genitalic region and
comparing it to Hemimerus vosseleri Rehn & Rehn, 1935. Two postabdomens of
Malaysian A. chartaceus were studied using common methods (maceration in 5%
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