A biological survey of the waters of Woods Hole and vicinity / By Francis B. Sumner, Raymond C. Osburn, and Leon J. Cole.

Pt.2

Integration of appetitive and aversive reinforcers and the neuromodulation of reward seeking and pain avoidance

Magdeburg, Univ., Fak. für Naturwiss., Diss., 2010

Auditory gating in the ventral striatum and auditory cortex : the role of stimulus-locking and the influence of discrimination learning

Magdeburg, Univ., Fak. für Naturwiss., Diss., 2014

Role of the neurotransmitters dopamine and acetylcholine during the interaction of working memory and attention

Magdeburg, Univ., Fak. für Naturwiss., Diss., 2015

List of mammals obtained by Thaddeus Surber, collector for the Museum, in the provinces of New Brunswick and Quebec, Canada, by D. G. Elliot.

v.3:no.3(1901)

The influence of shell species and size on the shell selection pattern of Paguristes tortugae (Decapoda, Diogenidae) from Anchieta Island (Ubatuba, Brazil)

Shell selection by the hermit crab Paguristes tortugae Schmitt, 1933 from Anchieta Island (Brazil) was analyzed using the six most frequently occupied shell species in the field and taking into account the sexual condition of the individuals, the shell size and the shell species. The experiments were conducted under laboratory conditions and the shell species preference was estimated on the basis of the frequency that each species was chosen by the individuals. The preferred shell species and size were determined by regression analysis. The highest correlation coefficients were obtained for the relations between the hermit dimensions and shell dry weight. The ovigerous females preferred shells with larger internal volume: Leucozonia nassa (Gmelin, 1791) and Cerithium atratum (Born, 1778). In the experiment of shell size, males preferred heavier shells whereas females selected the shape characteristics of the shell, such as the aperture and the internal volume, which are probably related to the growth and offspring guarantee, respectively. In general, and independent of sex condition, P. tortugae showed significant selection among all shells utilized. The results suggest that shell selection by P. tortugae involves sexual and reproductive condition preferences.

Microspines in the pylorus of Pseudonannolene tricolor and Rhinocricus padbergi (Arthropoda, Diplopoda)

The aim of this paper is to report the morphology and distribution of microspines in diplopods pylorus, as these are important structures present along the alimentary tract of arthropods. The morphology of the internal surface of the pylorus of Pseudonannolene tricolor Brolemann, 1901 and Rhinocricus padbergi Verhoeff, 1938 was analyzed by SEM. Pseudonannolene tricolor presents two morphologically distinct pyloric regions: anterior and posterior. The first region is characterized by the presence of thin microspines that increase in number and size towards the posterior portion; the second region presents smaller and triangular-shaped microspines distributed throughout small plates. The pylorus of R. padbergi does not present differentiated regions; the anterior portion is characterized by microspines grouped in plates that decrease in number and increase in size towards the ileum.