Access

You are not currently logged in.

Access your personal account or get JSTOR access through your library or other institution:

login

Log in to your personal account or through your institution.

Developmental Variability (Pelagic and Benthic) in Haminoea callidegenita (Opisthobranchia: Cephalaspidea) Is Influenced by Egg Mass Jelly

Glenys D. Gibson and Fu-Shiang Chia
Biological Bulletin
Vol. 176, No. 2 (Apr., 1989), pp. 103-110
DOI: 10.2307/1541577
Stable URL: http://www.jstor.org/stable/1541577
Page Count: 8
  • Subscribe ($19.50)
  • Cite this Item
Developmental Variability (Pelagic and Benthic) in Haminoea callidegenita (Opisthobranchia: Cephalaspidea) Is Influenced by Egg Mass Jelly
Preview not available

Abstract

Haminoea callidegenita Gibson and Chia (1989) has a pattern of development similar to that of other lecithotrophic opisthobranchs, except for the stage at hatching. In this species, both veligers and juveniles hatch from each egg mass. The percent of each hatching stage was variable among masses, with most masses having 30 to 50% of total hatchlings emerging as veligers. Both veligers and juveniles emerge throughout the entire hatching period (lasting 3-11 days), although the percentage of veligers decreases during this period. Encapsulated embryos cultured without egg mass jelly had approximately 80% of the total hatchlings emerging as veligers. Separated embryos cultured in the presence of egg mass jelly pieces hatched with percentages of veligers similar to that observed in intact egg masses, suggesting the possibility of a diffusible compound present in the jelly mass that induces intracapsular metamorphosis. Egg mass jelly also induces metamorphosis in hatched veligers. A juvenile and adult food source (the green alga Chaetomorpha linum) induces extracapsular metamorphosis only.

Page Thumbnails

  • Thumbnail: Page 
103
    103
  • Thumbnail: Page 
104
    104
  • Thumbnail: Page 
105
    105
  • Thumbnail: Page 
106
    106
  • Thumbnail: Page 
107
    107
  • Thumbnail: Page 
108
    108
  • Thumbnail: Page 
109
    109
  • Thumbnail: Page 
110
    110