Pristiophoriformes

>> Classification > Pristiophoriformes > Requin-scie d'Amérique

Pristiophorus schroederi - Bahamas sawshark - Amerikanischer Sägehai - Tiburon sierra americano

Requin découvert par Springer et Bullis en 1960.


Morphologie

 


Museau court orné de dents rostrales qui leur donnent l'aspect d'une lame de scie ;

 

Fusiforme, la tête est prolongée d'un rostre spectaculaire armé de denticules transversaux acérés et d'une paire de longs barbillons souples ;

Dents latérales ainsi que par deux longs barbillons prénarinaires ;
Les deux nageoires dorsales ne possèdent pas d'épine. La nageoire anales est absente ;

La scie correspond à 1/3 de la longueur totale.

 

Caractéristiques
  ____________________________________________________________________________________________________________________________________
  Taille Jusqu'à 80 cm.
  ____________________________________________________________________________________________________________________________________
  Masse  
  ____________________________________________________________________________________________________________________________________
  Nocturne/Diurne  
  ____________________________________________________________________________________________________________________________________
  Alimentation Petits poissons et invertébrés benthiques.
  ____________________________________________________________________________________________________________________________________
  Habitat Il évolue sur le plateau continental de 650 à 900 m.
  ____________________________________________________________________________________________________________________________________
  Distribution
Des Bahamas jusqu'à la Floride.
  ____________________________________________________________________________________________________________________________________
 

Maturité sexuelle

 
  ____________________________________________________________________________________________________________________________________
 

Mode de reproduction

Ovovivipare.
  ____________________________________________________________________________________________________________________________________
  Période de reproduction  
  ____________________________________________________________________________________________________________________________________
  Espérance de vie  
  ____________________________________________________________________________________________________________________________________
  IUCN Liste rouge DD
  ____________________________________________________________________________________________________________________________________

 


Distribution
  ____________________________________________________________________________________________________________________________________
  ____________________________________________________________________________________________________________________________________

 

 

Reproduction
  ____________________________________________________________________________________________________________________________________
  Jusqu'à 12 juvéniles.
  ____________________________________________________________________________________________________________________________________

 

 

Dangers
  ____________________________________________________________________________________________________________________________________
  Dangerosité

Aucune.

  ____________________________________________________________________________________________________________________________________
  Degré
  ____________________________________________________________________________________________________________________________________
  Exploitation humaine Aucune.
  ____________________________________________________________________________________________________________________________________

 

 

Particularités
  ____________________________________________________________________________________________________________________________________
 

Les barbillons latéraux souples jouent probablement un rôle de détection rapprochée lorsque le requin chasse au-dessus des sédiments.

Il se sert de son rostre pour tuer ses proies.

  ____________________________________________________________________________________________________________________________________

 

 

Classification
  ____________________________________________________________________________________________________________________________________
  Règne Animalia
  ____________________________________________________________________________________________________________________________________
  Embranchement Chordata
  ____________________________________________________________________________________________________________________________________
  Classe Chondrochtyes
  ____________________________________________________________________________________________________________________________________
  Sous-classe Elasmobranchii
  ____________________________________________________________________________________________________________________________________
  Super-ordre Euselachii
  ____________________________________________________________________________________________________________________________________
  Ordre Pristiophoriformes
  ____________________________________________________________________________________________________________________________________
  Famille Pristiophoridae
  ____________________________________________________________________________________________________________________________________
  Genre Pristiophorus
  ____________________________________________________________________________________________________________________________________
  Espèce Pristiophorus schroederi
  ____________________________________________________________________________________________________________________________________

 

 

Photos
  ___________________________________________________________________________________________________________________________________
 

  ___________________________________________________________________________________________________________________________________

 

 

Vidéos
  ___________________________________________________________________________________________________________________________________
 

  ___________________________________________________________________________________________________________________________________