Search the Community
Showing results for tags 'pseudosparnodus'.
-
From the album: Vertebrates
Pseudosparnodus microstomus (Agassiz, 1839) Eocene Lutetian Monte Bolca near Verona Italy -
The palaeoenvironment of Monte Bolca Lagerstätte was reconstructed as a basin or a sub-tropical lagoon, close to land and connected to rivers and wetlands. This basin showed phases of opening to the sea and phases of enclosure and isolation. During the "closed" phases, living conditions such as high(er) salinity and low(er) oxygen content in the bottom explained the exceptional conditions of fossilization and the absence of benthic fauna and scavengers. Worsening living conditions could also result in a higher percentage of fish infected by parasits. Their presence should reflect an unbalanced palaeoenvironment in the basin where the fishes of the "Pesciara di Bolca" fossilized. The collection of fossil fishes from Monte Bolca (Eocene of Northern Italy), deposited at the Museum national d'Histoire naturelle, Paris, was examined by Gilles Petit for the detection of parasites or traces of their activity. Of the 349 fishes studied, 62 showed a fairly well-preserved integument for the observation and 9.6% out of them showed skin-nodules. I am not sure, but I think this Pseudosparnodus microstomus had the same problem: Here is a close-up of it's ventral and abdominal region showing several skin nodules (at least that's what I believe): This is a close-up out of G. Petits original paper: And this is a living species with skin nodules (also out of G. Petits original paper): Here is the original paper from G. Petit Thomas
- 8 replies
-
- 1
-
- monte bolca
- pathological
-
(and 2 more)
Tagged with: