Unit 9 - Ecdysozoa Flashcards
1
Q
ecdysis
A
Unifying characteristic: shedding/molting of the cuticle
2
Q
Nematoda
A
- 25,000 species
- Thread-like
- Found everywhere
3
Q
Ecdysozoa
A
- includes: Nematodes, Nematomorpha, Kinorhyncha, Tardigrada, and Arthropoda
- all have cuticle that is molted
4
Q
Acoelomate, pseudocoelomate, or eucoelomate?
A
Pseudocoelomates
5
Q
Hydrostatic pressure
A
Very high pressure in body cavity
6
Q
Collagen
A
Structural protein that makes up the cuticle
7
Q
Cuticle
A
- Has a distinct criss-cross pattern of collagen
- has to be shed for growth to occur
8
Q
Muscle arms
A
extensions of muscle cell that connect to nerve cords
opposite of normal pattern
9
Q
Complete or incomplete gut?
A
Complete
10
Q
Digestive system
A
- Mouth
- Muscular pharynx
- Non-muscular intestine
- Anus - waste is projected due to pressure in the body
11
Q
Nematoda sperm
A
- Non-flagellated sperm, instead are ameoboid cells that move with pseudopodia
12
Q
Ascaris life cycle
A
- Eggs swallowed -> juveniles hatch in small intestine and burrow through intestinal wall and into blood -> heart -> lungs -> trachea -> stomach -> adults move to small intestine -> eggs are released in feces -> eggs swallowed
13
Q
Necator
A
- Hookworm
- Plates for feeding
- Burrows through skin
14
Q
Trichinella
A
- Trichina worm
- In meat, raw/under cooked
- produce live offspring
15
Q
Enterobius
A
- Pinworm
- Eggs ingested
- Adults found in large intestine
- Eggs laid around the anus at night
- most common in US
