VACCHI , Marino

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The Antarctic silverfish (Pleuragramma antarcticum) is the dominant pelagic fish inhabiting the shelf waters of Antarctica where it plays a key role in the coastal ecosystems providing a link between plankton and the top predators. Despite the great attention devoted to this fish by the polar scientific community, several aspects of its life...

In recent years, outreach and communication of polar sciences have been acknowledged as priorities for the Antarctic scientific community. One of the basic need to improve the effectiveness of knowledge transfer and dissemination is the availability of educational products being at the same time engaging and scientifically rigorous. The...

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Cytogenetics provides a unique platform to study in situ structural, functional, and evolutionary aspects of the genome. As such it holds powerful promise in decoding mechanisms and processes of genome architectural changes and their role in organism's diversification and evolution. Since the early 80s, such an approach has been applied to the...

Chimaeroid fishes are the only extant Holocephali, a subclass of Chondrichthyes. We describe for the first time a well evidenced structure localized in the palate of the chimaeroid Chimaera monstrosa, here named a palatal organ (PO). Attention has been paid to the holocephalan head morphology, but there has been no mention of this particular...

Sharks belonging to the family Hexanchidae have six or seven gill slits, unlike all other elasmobranchs, which have five gill slits. Their olfactory organs have a round shape, which is common for holocepha- lans, but not for elasmobranchs. Thus, the shape of the olfactory organ represents a further, less striking, peculiarity of this family...

Visual observations and videos of Chionodraco hamatus icefish at the "Acquario di Genova" and histological analyses of congeneric species C. hamatus and C. rastrospinosus adults sampled in the field provided new anatomical and behavioral information on the reproductive biology of these white blooded species that are endemic to the...

The Greenland shark (Somniosus microcephalus) is the largest predatory fish in Arctic waters. Knowledge of the fundamental biology and ecological role of the Greenland shark is limited, and the sensory biology of the Greenland shark has been poorly studied. Given the potential relevant contribution of chemoreception to the sensory capability of...

The main olfactory system has been identified in all the classes of vertebrates, while the vomeronasal system is lacking in some groups, such as birds and primates, which presumably have lost it. Chondrichthyes are one of seven vertebrate classes. The peripheral olfactory organs of these fishes are large olfactory rosettes, with a huge sensory...

Gross morphology and histology of the olfactory rose e of Greenland shark Somniosus microcephalus (Bloch & Schneider, 1801), suggest a well- developed olfactory capabil- ity for this top predator and scavenger na ve to Arc c waters. In the present paper, observa ons on the olfactory rose e are reported together with the gross morphol- ogy and...

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