The document discusses abalone and their classification as gastropods. It provides details about the characteristics of gastropods, including that they have a well-developed head with tentacles and eyes, undergo a process called torsion during development, have asymmetric coiled shells, and can reproduce sexually or hermaphroditically. The document also describes abalone anatomy, including how to determine their sexes, and their lifecycle from trochophore larvae to post-larval spat.

1. Nancy Caruso- Marine BiologistNancy Caruso- Marine Biologist

3.  Green Abalone Restocking ProgramGreen Abalone Restocking Program

4. Abalone are Gastropods!Abalone are Gastropods!
 Gastro pod = Belly FootGastro pod = Belly Foot
 Most Diverse Class with over 40,000Most Diverse Class with over 40,000
speciesspecies
 Snails, conch, nudibranch, abalone,Snails, conch, nudibranch, abalone,
limpetslimpets

5.  The gastropoda is the largest and mostThe gastropoda is the largest and most
certainly the best-known Class of all thecertainly the best-known Class of all the
molluscs. They are the most successful ofmolluscs. They are the most successful of
the molluscan classes, and occupy almostthe molluscan classes, and occupy almost
every habitat on earth, from desserts to highevery habitat on earth, from desserts to high
mountains, fields, forests, lakes, streams andmountains, fields, forests, lakes, streams and
oceans - and most probably your back yard!! oceans - and most probably your back yard!!
It is the only class to contain species thatIt is the only class to contain species that
have ventured permanently on to land. (Tohave ventured permanently on to land. (To
do this, snails evolved an efficient glidingdo this, snails evolved an efficient gliding
foot, eyes, an aggressive eating mechanismfoot, eyes, an aggressive eating mechanism
and a pulmonary system for breathing.) and a pulmonary system for breathing.)

6. Characteristics of GastropodsCharacteristics of Gastropods
 1. Well-developed head: tentacles, pigment eyes, CNS1. Well-developed head: tentacles, pigment eyes, CNS
 2. Torsion and development2. Torsion and development
unique to gastropods, torsion involves twisting of the bodyunique to gastropods, torsion involves twisting of the body
during the veliger stage, a 180during the veliger stage, a 180oo
turn and upward twist of theturn and upward twist of the
posterior occurs to reposition it over the headposterior occurs to reposition it over the head
represents a change of shell from a shield to a retreatrepresents a change of shell from a shield to a retreat
 3. Shell Asymmetric helical coiling - separate event from torsion3. Shell Asymmetric helical coiling - separate event from torsion
Secondary loss of shell and detorsion - nudibranchs, slugsSecondary loss of shell and detorsion - nudibranchs, slugs
 4. Reproduction - dioecious (2 sexes) or hermaphroditic (snails)4. Reproduction - dioecious (2 sexes) or hermaphroditic (snails)
 5. Specialized respiration in pulmonates (land snails)5. Specialized respiration in pulmonates (land snails)

7. Abalone Anatomy andAbalone Anatomy and
ReproductionReproduction

8. How do you sex an abalone?How do you sex an abalone?

9. FemaleMale

11. Female

12. MALE

13. Photo credit: Frank
O’Donnel

15. (radula)

16. RadulaRadula

21. BUILD AN ABALONEBUILD AN ABALONE
WORKSHOPWORKSHOP
 Kelpfest 2011Kelpfest 2011

31. Abalone come to life!Abalone come to life!

35. 24 Hours
14-21 days
1-3 months

37. Trocophore LarvaeTrocophore Larvae

38. Veliger LarvaeVeliger Larvae

39. Post larval spatPost larval spat (settled/crawling)(settled/crawling)

45. The End