10 chap 16 mollusca - fayetteville state universityfaculty.uncfsu.edu/ssalek/zool110/finished...
TRANSCRIPT
![Page 1: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/1.jpg)
Mollusca
andIntroduction to Spiralia
![Page 2: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/2.jpg)
Phylogeny of Protostomes
Protostomia
Bilateria
Spiralia
Deuterostomia
Ecdysozoa
![Page 3: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/3.jpg)
Ancestry of Mollusca
Protostomia
Spiralia Ecdysozoa
Lophotrochozoa
Platyhelminthes,Rotifera LophophorataEutrochozoa
AnnelidaMollusca
![Page 4: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/4.jpg)
Trochophore Larvacompare Hickman Fig. 16-6
• basis of the term Eutrochozoa• present in many marine mollusks and annelids
![Page 5: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/5.jpg)
Marine Mollusk Larvaecompare Hickman Fig.’s 16-6 and 16-7
Veliger
![Page 6: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/6.jpg)
Phylum Mollusca• Name means “soft-shelled nut”• 2nd largest phylum in number of species • Most are free-living and marine
– but many clams and snails are freshwater or terrestrial
• Feeding habits:– Scrapers and suspension feeders (rarely,
carnivores)
![Page 7: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/7.jpg)
Eucoelomate Body Design
Coelom: fluid-filled cavity between gut and body wall that is lined with mesodermal cells (peritoneum).
acoelomate
pseudocoelomate
eucoelomateendodermmesodermectoderm
(muscles, not peritoneum)
peritoneum
![Page 8: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/8.jpg)
Important Mollusk Features• coelom - just the pericardium, a sac around the
heart• muscular foot - posterior, ventral, locomotory• mantle - dorsal epidermis that makes the shell
– also encloses the body in a mantle cavity– ciliated mantle cavity helps with respiration and
sometimes feeding• radula - tongue-like scraper used for feeding
![Page 9: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/9.jpg)
Molluscan Anatomy(chiton; Hickman Fig. 16-9)
![Page 10: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/10.jpg)
Mollusk Body DesignsHickman Fig.’s 16-9, 16-18, 16-31, 16-38
![Page 11: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/11.jpg)
• not present in Bivalvia
Radula Hickman Fig. 16-2
motion while feeding
![Page 12: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/12.jpg)
Mollusca Classesrequired in ZO 110
• Bivalvia - clams, mussels, oysters, etc.• Polyplacophora - chitons• Gastropoda - snails and slugs• Cephalopoda - squid, octopus, nautilus
![Page 13: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/13.jpg)
Bivalviaclams and mussels
• shell of two "valves”• lateral, ciliated gills for respiration and
filter-feeding• narrow foot for burrowing• head just mouth and labial palps - no radula
![Page 14: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/14.jpg)
Clam Filter-Feeding FlowHickman Fig. 16-30, 16-31
Pos.
Ant.Dor.
Ven.
![Page 15: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/15.jpg)
Valuable Bivalvia
• many are edible– oysters, scallops, blue mussels, clams
• river mussels – harvested for making seed pearls– symbol of freshwater biodiversity
• popular with collectors
![Page 16: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/16.jpg)
Bivalve PestHickman Pg 343
Dreissena, the zebra mussel
![Page 17: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/17.jpg)
Polyplacophorachitons
• eight dorsal shell plates• slow-moving - foot has strong suction• grazer-scrapers with radula
– eat algae from rocks between or below the tides
![Page 18: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/18.jpg)
Gastropodasnails and slugs
also conchs, limpets, abalones, and sea hares• terrestrial, freshwater, or marine• single shell, or none• scrape up food or attack prey with radula • most diverse mollusk class
– > 40,000 named species
![Page 19: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/19.jpg)
Gastropod Body DesignCampbell Fig. 16.18
![Page 20: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/20.jpg)
Snail AnatomyHickman Fig. 16-18
![Page 21: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/21.jpg)
Shell-less GastropodsHickman Fig. 16-22, 16-23
![Page 22: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/22.jpg)
Conus Eats a FishHickman Fig. 16-16
![Page 23: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/23.jpg)
Class Cephalopodanautilus, squid, octopus
• modification of foot, addition of a beak for carnivory
• reduced shell or flotation for swimming• improved respiration, circulation, and
neural/behavioral complexity support high activity levels
![Page 24: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/24.jpg)
NautilusHickman Fig. 16-36
• many tentacles, without suckers• large shell, floated by chambers of gas
![Page 25: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/25.jpg)
Squid FeaturesCompare Hickman Fig. 16-38
• streamlined shape• undulating lateral fins• funnel• arms & tentacles with
suckers, sometimes poison
Usual direction of movement - dorsal
![Page 26: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/26.jpg)
Giant Squid!
Artituthus can be 30 ft+
![Page 27: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/27.jpg)
Complex Squid BehaviorHickman Fig. 16-39
• shell reduced to pen • mood and camouflage colors• ink for concealment
![Page 28: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/28.jpg)
OctopusHickman 16-40
• 8 arms with suckers• shell lost, body soft• ink sac
![Page 29: 10 Chap 16 mollusca - Fayetteville State Universityfaculty.uncfsu.edu/ssalek/Zool110/Finished Lectures PDF/10 Chap 16 mollusca.pdfPhylum Mollusca • Name means “soft-shelled nut”](https://reader034.vdocument.in/reader034/viewer/2022042419/5f3603a26a4bd77f7457405c/html5/thumbnails/29.jpg)
Pop Quiz 4
1. Term for the hard structure used by cephalopods in feeding: _______
2. Term for the molluscan coelom that is restricted to the area around the heart: __________
3. Class name for the chitons: ______