Annelid Allies Flashcards

1
Q

annelid affinities

A
  • Pogonophora (Siboglinidae)

- Echiura

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Molluscan affinities

A

Sipuncula

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Pseudocoelomates affinities

A

Priapulida
(most similar to Ecdysozoa (Nematoda, Nematomorpha, Kinoryhncha and Loricifera))
molts any may have pseudocoel

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

Shared characteristics

A
  • vermiform
  • hydrostatic skeleton
  • unsegmented (except Siboglinidae)
  • used to be lumped into one phylum
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

adaptive zones

A

Priapulida- marine burrowers, some interstitial, some tubiculous

Sipuncula- marine burrowers, some bore into coral, deposit feeders

Echiura- marine burrowers, filter+deposit feeding

Pogonophora- deep sea, tube building, symbiosis w/ chemoautotrophic bacteria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

tubicolous

A

(of a marine worm) living in a tube

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

meiofauna

A

minute interstitial animals living in soil and aquatic sediments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Priapulida characteristics

A
$-Cambrian fossil (1500 specimens) >> Phylum
$-coelum or pseudocoel
$-molts
$-through gut
-separate sexes
$-spiny proboscis
-no circulatory system, respiratory pigment Hemerythrin
-planktonic larvae
$-tail-like appendage
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Sipuncula characteristics

A
  • first fossil most likely Cambrian&raquo_space; Phylum
    -protostome
    -cilliary photorecepters near mouth
    -coelum
    $-trochophore larvae (characteristic of most mollusks) can become pelagosphaera larvae (unique to sipuncula)
    $- can develop directly, can go through troch. larva stage, or troch. and pelago. stages
    -separate sexes
    $-urn cells
    -U shaped gut (like gastropoda?)
    $-introvert w/ tentacles
    -ventral nerve
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Trochophore larva

A

top shaped cilliated larva

-Most mollusks, most marine annelids, Entoproctoa, Sipuncula, and Echiura

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Echiura Characteristics

A
$-annelid class
$-earliest fossil Pennsylvanian >> class
$-"in-keeper" worm, burrow w/ symbionts
-proboscis
-through gut
-open circulatory system with hemoglobin
-setae
-trochophore larvae
-separate sexes
-ventral nerve
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Pogonophora- Siboglinidae characteristics

A

$-posterior segmentation

  • deuterostomes, but gut lost in adults
  • few cm to a few m
  • spiral cleavage
  • ventral nerve cord, ganglia
  • closed circulatory system, hemoglobin
  • separate sexes
  • body sections sepatarted by septa
  • coelomate
  • rare fossils
How well did you know this?
1
Not at all
2
3
4
5
Perfectly