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Echinodermata

Zoology 212 Lecture notes on echinodermata
Course

Zoology (BIOL 212)

28 Documents
Students shared 28 documents in this course
Academic year: 2022/2023
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Saginaw Valley State University

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1 Welcome to the deuterostomes: 3 phyla: Echinodermata, Hemichordata, and Chordata. Hemichordata Echinodermata Chordata Deuterostomia Ambulacraria lowe.stanford/wp-content/uploads/2014/05/Saccoglossus-adult.jpg

  1. Blastopore becomes anus
  2. Enterocoely
  3. Radial cleavage
  4. Pharyngeal gill pouches/pores
  5. Unique larvae
  6. Tripartite coelom
  7. Axial complex
  8. Shared hypothetical dipleurula
  9. Restricted to marine water Chordate synapomorphies next discussion 1 2 Acorn worms have a tornaria larva and come in two flavors: free-living, benthic, mobile and sessile, colonial lineages
  10. Tube body plan is colonial & sessile. [Pterobranch lineage]. tolweb
  11. The worm body plan is benthic and mobile. [Enteropneust lineage]. Acorn worms : tornaria larva bio iam i.edu/dana/106/106F14_14 l Echinoderms : bipinnaria larva HTTP:METAZOAN.AUBURN/HALANYCH/LAB/PROJECTS.HTML 2 Hemichcreates

Radial Clearage

blastopo

-mouth

chordata

stemichordata

Echinodermata = protos ⑧ Ambulacia

Gatorade

conn

splitting O SchizOC0ely

To

enterstonan

=> enterocuely -triploblasts &radial cleavage ⑪ budding =2 body Cavity pharyngeal gills pouches/site/pores Yeswo pseudocoesom' coelom

####### blastoccel

bulzecrcinan

  • blastoppe

·ifiring

ani

5 Spiny skin and ossicles [> 95% CaCO 3 ] provide rigidity and protection. They vary in shape/form and thus function! ossicles echinoblog.blogspot esu medial view of ossicles Starfish spines bodegahead.blogspot From Invertebrate Zoology, Ruppert & Barnes pedicellaria McCuller 5 asnailsodyssey/IMAGES/CLAM/PisBrevWHum.jpg Recycling an octopus Animalseatinganimals 6 Echinoderms are predators, detritivores, herbivores, and recyclers. In starfish, 2-part stomach, the cardiac portion can be everted. Waiting 30 minutes for the adductor muscles to tire. mageebio11spring2012.wordpress Internal view: Ossicles form a 5-part feeding structure that grazes algae. Short “teeth” project at the thumb. 6

limestone

~ Imbeded Inside of - - externally starfish Spine - used to keep Skin Clean mainly ~sea urchican Pyleicach

9 Development shifted from bilateral to pentaradial symmetry in combo with a separation of larval and adult ontogenies rjfisherjoanides.pbworks Mature bipinnaria, Pisaster ochraceus 24 days old. Photo: U Saskatchewan Archives Transformation: left side of larva becomes the oral surface, new mouth, new anus. 9 10 Fossils record this body plan reorganization. Adults originally had bilateral symmetry ... as well as the larval stages. Ctenoimbricata spinosa, Cambrian Zamora et al. 2012 Pseudocrinites magnificus, Ordovician to Devonian nhm.ac nhm.ac Pre-radiate body plan Fossil diversity is 2x > than extant diversity. 540 mya today 10 bipinaria larva metamorphism "madreporite" L bia because of presivation

11 Crinoids [sea lilies/feathers] are sessile, suspension feeders. 6x > diversity in the fossil record eol Cordell Bank, CA. Dr. Abalone turnstone/rom181tc.htm Arms are branched with pinnules giving them that feather like appearance. Cirri hold them in situ, although they can crawl. 11 12 Asteroids possess an adaptive defensive strategy, amazing abilities of regeneration, and unique means of respiration. Autotomy Nervous system control and involves mutable connective tissue. Dermal branchiae for respiration Eye detects crude images! Reefnation 12 multiple of 5 T ↑ feeding s ↑ SA "Starfish"

  • Intentional drop of arm
  • Flexable
  • organs gas exchange reproduction
Asetua

agmentation ~>Pedacelaria Oral side =

####### T

wrs - movement

15 Sea urchins [Echinoidea] have a test [fused ossicles] with a complex feeding apparatus [Artistotle’s lantern]. metafysica asnailsodyssey/VIDEOS/URCHIN/AristotLant.html Commonfossilsofoklahoma.snomnh.ou kerimehome.blogspot wordglow.wordpress Richard Howey, W yom ing. Aristotle’s lantern Aristotle’s lantern of sand dollar Test of sea urchin demonstrates pentaradial symmetry 1 2 15 16 enterocoely Mesoderm schizocoely 16 Ossides for test

  • mouth- 5 parts 5 4 3 fissue connective 2 3 I I 3 " I L S
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Echinodermata

Course: Zoology (BIOL 212)

28 Documents
Students shared 28 documents in this course

University: Saginaw Valley State University

Was this document helpful?
1
1
Welcome to the deuterostomes:
3 phyla: Echinodermata, Hemichordata, and Chordata.
EchinodermataHemichordata Chordata
Deuterostomia
Ambulacraria
http://lowe.stanford.edu/wp-content/
uploads/2014/05/Saccoglossus-adult.jpg
1. Blastopore becomes anus
2. Enterocoely
3. Radial cleavage
4. Pharyngeal gill pouches/pores
1. Unique larvae
2. Tripartite coelom
3. Axial complex
4. Shared hypothetical dipleurula
5. Restricted to marine water
Chordate synapomorphies
next discussion
1
2
Acorn worms have a tornaria larva and come in two flavors:
free-living, benthic, mobile and sessile, colonial lineages
2. Tube body plan is colonial & sessile.
[Pterobranch lineage].
tolweb.com
1. The worm body plan
is benthic and mobile.
[Enteropneust lineage].
Acorn worms : tornaria larva
http://www.bio.miami.edu/dana/106/106F14_14.html
Echinoderms : bipinnaria larva
HTTP://METAZOAN.AUBURN.EDU/HALANYCH/LAB/PROJECTS.HTML
2
Hemichcreates

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