Skip to content. | Skip to navigation

Personal tools

 
 
 
 

 
                 
You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / The fibrovascualar ring: A synapomorphy of hystricognath Rodentia newly described in Petromus typicus and Octodon degus

Andrea Mess (2005)

The fibrovascualar ring: A synapomorphy of hystricognath Rodentia newly described in Petromus typicus and Octodon degus

BELGIAN JOURNAL OF ZOOLOGY, 135(S1):31-38.

Hystricognathi is a higher monophyletic taxon within Rodentia that is supported particularly by characters of early ontogeny and placentation. Since the original findings are based on a small sample of species, further information on character distribution is desirable. The present paper provides new insight, into the morphology of one of the most significant characters in two additional species of Hystricognathi, i.e. Petromus typicus A. SMITH, 1831 and Octodon degus MOLINA, 1782. In both species an arterial ring within the inverted yolk sac splanchnopleura that is associated with a network of capillaries is present throughout pregnancy. Consequently, the existence of the so called ``fibrovascular ring'' is confirmed for these species and distributional data Suggest that it can be regarded as a synapomorphic feature of Hystricogrnathi. Thus, two of the three original diagnostic characters of Hystricognathi are now confirmed for a larger set of taxa.

Rodentia; Hystricognathi; phylogeny; ontogeny; fetal membrane structures; yolk sac vessels; sinus terminalis; fibrovascular ring
BJZ

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Editor-in-Chief:
Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium

 



1863-1903
Annales de la Société malacologique de Belgique
 
1903-1923
​Annales de la Société royale malacologique et zoologique de Belgique
 
1923-1989
Annales de la Société Royale Zoologique de Belgique
 
1989-
Belgian Journal of Zoology