Development:Cnidaria, Arthropoda, & Chrodata

BY:

http://www.uni.illinois.edu/~stone2/bee_life_stages.html

http://www.uni.illinois.edu/~stone2/bee_life_stages.html

http://www.uni.illinois.edu/~stone2/bee_life_stages.html

http://www.uni.illinois.edu/~stone2/bee_life_stages.html

http://www.uni.illinois.edu/~stone2/bee_life_stages.html

http://www.uni.illinois.edu/~stone2/bee_life_stages.html

http://www.uni.illinois.edu/~stone2/bee_life_stages.html

http://www.uni.illinois.edu/~stone2/bee_life_stages.html

Phylum: Chordata

Developmental Stages

• The intrauterine Egg

• The Incubation Egg

• The Juvenile Stage

• The Adult Stage

Intrauterine egg phase

During the intrauterine egg phase the platypus shares many common features with birds and reptiles.

The formation of the primitive streakwithin the embryonal area of the yolk sac is shared not only with birds and reptiles but also marsupials.

Incubation

•During the incubation egg phase the platypus develops its organs.

•While still relying on the yolk, the digits and extremities begin to develop.

•After about 9 days, the yolk is completely absorbed and a hatching tooth emerges. The baby platypus is born.

Juvinile Phase• The Juvenile phase is where the

platypus gains most of its life skills and nutrients that best represent mammals.

• The platypus nurses its young from two milk patches on the underside of its belly for about 4-5 months

• During the weaning process the Juvinile emerges from its burrow and begins to eat solid foods and swim.

Juvinile Phase• During this juvenile

period lasting about 1 year of age the platypus is not capable of reproduction.

• In some cases it can take up to two years for the platypus to reach maturity. It is around the point where maximum body length is achieved and food intake is equal to its weight in a 24 hour period the platypus is consider to be an adult.

Adult Phase

• At adulthood the platypus is able to reproduce.

• It has developed a defense mechanism to allow venomous chemicals to be injected into predators from a needle like spine protruding out of the hind legs.

• The males do not care for the young, and remain in separate burrows than females.

Adult Phase

• The females remain fertile for about 9 years after maturity and males are capable of sexual reproduction through out their lifespan.

• The platypus has a normal life span of about 25 years.

Phylum:

Chordata

Life Cycle

• An elephant’s life cycle is divided into 3 main periods, excluding fetal development.

• They are the infant, the adolescent, and the adult periods.

• Before further discussing these periods, let’s talk about the fetal development stage of an elephant.

Fetal Development(average gestation period of 660 days.)

Works Cited

• http://www.theguardian.com/world/2013/dec/04/africa-elephant-census-capture-falling-numbers

• http://www.elephanttag.org/general/general_elephant_reproduction.html

• http://rspb.royalsocietypublishing.org/content/274/1608/323.full

• http://www.pnas.org/content/96/10/5555.fullhttp://www.ncbi.nlm.nih.gov/pmc/articles/PMC1692305/http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1692310/

• http://australianmuseum.net.au/Platypus• http://www.australianfauna.com/platypus.php

Illustrations: By Alexia Dickey

PresentersJellyfish Development – Alexia DickeyHoney Bee Development – Samantha HuffmanPlatypus Development – John PeckElephant Development – Sereen Mughrabi