Season does not influence the response of great tits (Parus major) to allopatric mobbing calls

Journal of Ethology - Many species of birds emit mobbing calls to recruit prey to join mobbing events. This anti-predator strategy often involves several species and, therefore, implies...     

<Emphasis Type="Italic">Choanocystis antarctica</Emphasis> sp. n., a new heliozoan (Centrohelida) species from the littoral zone of King George Island,South Shetland Islands,Antarctica

The morphology of a new marine heliozoan from the sandy littoral of King George Island (the South Shetland Islands, Antarctica) is described. The species is characterized by bent or curved spicules with a spur at the shaft bend point. Similarities and differences between the new species and other representatives of the genus Choanocystis are considered.     

Transient opening of tricellular vertices controls paracellular transport through the follicle epithelium during Drosophila oogenesis

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The morphology of predatory flagellate Colpodella pseudoedax Mylnikov et Mylnikov, 2007 (Colpodellida, Alveolata)

The structure of the predatory freshwater flagellate Colpodella pseudoedax was studied. The cell was found to contain two heterodynamic flagella, three-membrane pellicle, micropores, subpellicular microtubules, microtubular open-side conoid, roptries, micronemes, extrusive organelles (trichocysts), and mitochondria with vesicular and tubular cristae. Upon discharge, trichocysts form cross-striated bands. A thin-walled cylinder lies in the transitional zone of the flagella. Cells reproduce by means of longitudinal binary fission. This species differs from similar C. edax by their smaller cell size and lack of reproduction cyst. Similarities between C. pseudoedax and other colpodelids, as well as between colpodellids and perkinseids and sporozoans, are discussed.