- Evolution: Evolving Species
- Answer the following question:
- Looking at a rock stratification, where would you expect to find
the oldest fossils? Why?
- Homework Check
- Classwork: Evolution of Barbellus
- Answer the questions for the Evolution of Barbellus
- Using the questions generated (made) in class, write an essay/summary
of the article Evolving
Before Our Eyes.
- Answering the Question of the Day:
- The oldest fossils will be found on the bottom, because new dirt and
sand had covered the older fossils.
- The Tullymonster
- Discussion about which phylum the tullymonster belongs. What properties
does the tullymonster have?
- Tail fin,
- bar Organ for vision,
- transverse bar,
- proboscis with non-retractable teeth for feeding,
- probably segmented.
- What phylum are similar to the tullymonster?
- Annelids are segmented. Some annelids have teeth, but their teeth
- Nothing known has a transverse bar.
- Arthropods (shrimp and insects) have eye organs and eye stalks
somewhat similar to the bar organ, if the transverse bar had extended
out from the body.
- The class agrees that although their are similar features to several
phyla, particularly the annelids, the tullymonster belongs in its own
phylum. There are just too many odd things about it.
- Evolution of Barbellus
- What is a family tree?
- Before assembling the family tree of the genus Barbellus, first
look at the rock stratification in figure 1. Which species are oldest?
- Group Barbellus based on age.
- Next, compare the species of Barbellus with each other. Which
species look most like another species?.
- One group looks segmented.
- Another group looks like fish.
- One Barbellus is not in the stratification. Where does it
- Again remember that evolution if very conservative. New parts will
not appear, disappear, then reappear again. Parts will simple be restructured,
and may disappear altogether. Now put Barbellus' family tree
- Now lets check Barbellus' family tree (cladigram).
Before Our Eyes
- Scan the article's title and headings.
- Write questions that
the title and headings suggest.
- Now share the first question from each member of the class.
- Base your essay upon the class' questions.