Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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Transcribed Image Text:2-Let us look now at the other species: Obelia geniculata (estimated time 30 min)
Based on the text and the photos below, draw a labelled diagram of the life cycle of Obelia
geniculata (using Aurelia aurita as a model)
Obelia geniculata : life cycle
The fixed form of Obelia geniculata is a colony of polyps: the polyps are connected by a common
stem structure termed hydrocaulus and the colony can be considered as one single organism. Two
types de polyps co-exist: polyps having tentacles with stinging cells for capturing food and for
protection called hydrozoïds or gastrozoids and polyps with no tentacles termed gonozoïds. The
gonozoïds generate buds developing into medusae that detach from the gonozoids and are free
swimming in seawater. These medusae produce male and female gametes (there are males
medusae and female medusae). The fertilised egg develops into a larval form called a planula that
attaches to a solid surface and generates a new colony (see diagram below):
hydrozoïd
bud
hydrocaulus
Planula form
-Tentacles
Perisacral annuli
Medusa buds
-Coenosarc
Gonopore
Gonotheca
Blastostyle
Hydrocaulus
OBELIA-PART OF HYDROID COLONY
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