High Desert Vapes Friday Night Free E-Liquids Giveaway!!
- Thread starter Brewtus
- Start date
- th_trl_thread_readers 0
- Status
1) Identify the shared derived characters of the clade Bilateria.
-Bilateral Symmetry
-Mesoderm
-Coelom*
-Central nervous system
-Cephalization*
*Secondarily lost in some clades
-Bilateral Symmetry
-Mesoderm
-Coelom*
-Central nervous system
-Cephalization*
*Secondarily lost in some clades
2) Describe the characteristics of the phylum Acoelomorpha and it's position within the bilateria
Acoelomorpha - 370 marine species, <5mm long. worm-like. mostly lives in bottom sediments. simplest structure of any bilaterian.
- ciliated epidermis.
- no coelom.
- no organs.
- some lack even a permanent gut, and form vacoule around food particles. Some DO have a sac-like gut.
- DOES have mesoderm.
Code:
Bilateria-----_Acoelomorpha _Lophotrochozoa
| |
| _Protostomia---------|
|___| |_Ecdysozoa
|_Deuterostomia- ciliated epidermis.
- no coelom.
- no organs.
- some lack even a permanent gut, and form vacoule around food particles. Some DO have a sac-like gut.
- DOES have mesoderm.
3) Identify the evolutionary relationships among the following clades within the protostomia: Lophotrochozoa, trochozoa, kryptochozoa, platyzoa, gnathifera, polyzoa
....................................................Platyzoa- Platyhelmenthes - Gastroriche, Gnathifera
......................Lophotrophozoa<..Polyzoa- Cycliophora - Entoprocts, ectoprocts
Protostomia<...............................Trochozoa- annelida-mollusca, kryptochozoa
......................Ecdysozoa
....................................................Platyzoa- Platyhelmenthes - Gastroriche, Gnathifera
......................Lophotrophozoa<..Polyzoa- Cycliophora - Entoprocts, ectoprocts
Protostomia<...............................Trochozoa- annelida-mollusca, kryptochozoa
......................Ecdysozoa
can i get that in english please
Bilateral symmetry - there's only one way you could slice it in half and get mirror parts.
Mesoderm - tissue layer that gives rise to muscles and nerves and internal organs
Coelom - internal cavity lined with mesoderm
central nervous system - as in having nerves and a brain
cephalization - having a distinct head. "can you put a hat on it?"
I won't. I've got this.
I'm just trying to make sure i have the spelling down and stuff.
I'm just trying to make sure i have the spelling down and stuff.
4) describe the general characteristics of the phylum platyhelminthes and the specific characteristics of the turbellaria, trematoda, monogenea, and cestoda.
Platyhelminthes: dorsoventally flattened worms. 20,000 species. Marine, freshwater, and parasitic.
No definitive morphological features.
no coelom; parasites tend to be greatly simplified. They have either an incomplete gut, or even no gut at all. Ciliated epidermis in most free-living species. syncytical tegument in parasitic species. simple excretory system in some.
turbellaria are free-living flatworms. mostly marine, some freshwater (planerians) .5cm-.5m long. cellular ciliated epidermis.
longitudinal and circular muscles, sometimes oblique as well. simple cerebral ganglia with 2 lateral nerves with transverse connections. ventral mouth with extendable pharnyx.
Platyhelminthes: dorsoventally flattened worms. 20,000 species. Marine, freshwater, and parasitic.
No definitive morphological features.
no coelom; parasites tend to be greatly simplified. They have either an incomplete gut, or even no gut at all. Ciliated epidermis in most free-living species. syncytical tegument in parasitic species. simple excretory system in some.
turbellaria are free-living flatworms. mostly marine, some freshwater (planerians) .5cm-.5m long. cellular ciliated epidermis.
longitudinal and circular muscles, sometimes oblique as well. simple cerebral ganglia with 2 lateral nerves with transverse connections. ventral mouth with extendable pharnyx.
trematoda - flukes. parasites with complex life cycles, two or more hosts. Endoparasites of vertebrates. Has hooks or suckers used to attach to host. vertebrates are definitive host in which adults live and reproduce sexually. intermediate hosts are where the eggs & larval stages live and reproduce asexually.
similar to turbellaria morphologically with three-part intestine, except for anterior mouth.
similar to turbellaria morphologically with three-part intestine, except for anterior mouth.
monogenea- also flukes, with a single host. ectoparasites, live on (not in) it's host. typically attaches to fish gills. appears more or less benign, feeding on food scraps.
has an posterior structure called the opisthaptor with hooks used to attach to host.
has an posterior structure called the opisthaptor with hooks used to attach to host.
cestoda - tapeworms. No mouth, no gut. Absorbs nutrients through tegument. large surface area because of fingerlike projections on tegument called the microtrix.
anterior end is called the scolex, which has hooks or suckers for attachment to host. The rest of the body segmented into proglottids. They are monecious but typically reproduce with another worm. Gravid proglottids are shed and excreted through feces.
anterior end is called the scolex, which has hooks or suckers for attachment to host. The rest of the body segmented into proglottids. They are monecious but typically reproduce with another worm. Gravid proglottids are shed and excreted through feces.
Trematoda, Monogenea, and Cestoda are collectively called the Neodermata because of their distinct syncytical tegument.
5) describe the life cycles of the Chinese liver fluke and beef tapeworm.
The liver fluke lives in the bile duct of a human host, and eggs are released into the small intestine and excreted. (definitive host.)
Snail injests these eggs (which are shelled larvae, actually) which then reproduce asexually within it. (intermediate host)
These resulting larvae called the Cercoria burrow out and swim to burrow into a fish, where it encysts in the skeletal muscles. (intermediate host)
A human then eats the raw or undercooked fish and the cycle starts all over.
The liver fluke lives in the bile duct of a human host, and eggs are released into the small intestine and excreted. (definitive host.)
Snail injests these eggs (which are shelled larvae, actually) which then reproduce asexually within it. (intermediate host)
These resulting larvae called the Cercoria burrow out and swim to burrow into a fish, where it encysts in the skeletal muscles. (intermediate host)
A human then eats the raw or undercooked fish and the cycle starts all over.
The beef tapeworm lives in the gut of a human. They reproduce (either with themselves or another worm) Ripe proglottids are excreted in feces.
A cow then injests the eggs. The larvae hatch and migrate to the skeletal muscles of the cow where they encyst themselves ("bladder worms")
Insufficiently cooked beef is then injested and the cycle begins anew.
my instructor assures me that freezing the meat for 5 days should kill any bladder worms. good, i like em rare.
A cow then injests the eggs. The larvae hatch and migrate to the skeletal muscles of the cow where they encyst themselves ("bladder worms")
Insufficiently cooked beef is then injested and the cycle begins anew.
my instructor assures me that freezing the meat for 5 days should kill any bladder worms. good, i like em rare.
- Status
Similar threads
- Locked
- Locked
