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On the existence of a prootic basi occipital bony chamber for the vascular posthypophyseal sac in adult notopteridae pisces osteoglossomorpha

On the existence of a prootic basi occipital bony chamber for the vascular posthypophyseal sac in adult notopteridae pisces osteoglossomorpha

Revue de Zoologie Africaine 90(2): 463-469

The chamber is delimited in Notopterus by the prootic bridge, a lateral elevation from each prootic bone and the small cavity of the basioccipital. It contains the vascular sac that forms a large median protuberance behind the hypophysis. In Papyrocranus it is formed essentially in the same way, although the cranial bones are much modified. In Xenomystus the posterior part of the prootic gives rise to a lateral ridge rising above the prootic bridge, even higher than in the other 2 genera. Towards the rear, the summits of the ridges meet, forming a 2nd prootic bridge above the 1st. In front, between the 2 bridges, is a small aperture. The median internal part of the basioccipital is hollowed between the 2 bridges, producing a large chamber which, with the 2 prootic bridges, marks off another large chamber which houses the median vascular sac.

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