Nom du corpus

Corpus Systématique Animale

Titre du document

Sexual dimorphism in the sand dollar Echinarachnius parma

Lien vers le document
Springer (journals)
Langue(s) du document
Type de document
Nom du fichier dans la ressource
  • Jean-François Hamel 1,2
  • John H. Himmelman 1,2
  • 1) Département de Biologie, Université Laval, G1K 7P4, Québec, Canada
  • 2) GIROQ (Groupe interuniversitaire de recherches océanographiques du Québec), Université Laval, G1K 7P4, Québec, Canada

Samples of Echinarachnius parma (Lamarck), collected during summer 1988 from three sites along the eastern coast of Canada (the northern Gulf of St. Lawrence, Chaleur Bay and the Bay of Fundy), showed sexual dimorphism in the shape of the oral surface in addition to marked changes in the camber of the aboral surface related to the strength of wave and current activity. The oral surface is more concave in males than in females. The dimorphism develops as individuals become sexually mature and is pronounced for individuals measuring >4 cm in diameter. Associated with this shape difference, the volume of females is greater than for males, and this corresponds to the larger size attained by the ovaries compared to the testis. Shape differences between males and females are rare in echinoderms, and E. parma is the first species for which the sexes can be separated with a high degree of accuracy (>80%) on the basis of shape.

Catégories Science-Metrix
  • 1 - natural sciences
  • 2 - biology
  • 3 - marine biology & hydrobiology
Catégories INIST
  • 1 - sciences appliquees, technologies et medecines
  • 2 - sciences biologiques et medicales
  • 3 - sciences biologiques fondamentales et appliquees. psychologie
  • 4 - psychologie. psychophysiologie
Catégories Scopus
  • 1 - Physical Sciences ; 2 - Environmental Science ; 3 - Ecology
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Aquatic Science
  • 1 - Life Sciences ; 2 - Agricultural and Biological Sciences ; 3 - Ecology, Evolution, Behavior and Systematics
Catégories WoS
  • 1 - science ; 2 - marine & freshwater biology
Identifiant ISTEX

Marine Biology

Année de publication
Présence de XML structuré
Version PDF
Score qualité du texte
  • Echinodermes
Type de publication
Powered by Lodex 9.3.8