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ZOOL 250 lectures 13-28 > 22 panarthropod- lobopod phyla > Flashcards

22 panarthropod- lobopod phyla Flashcards

1
Q

what is panarthropoda part of

A

ecdysozoa

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2
Q

what does being in ecdysozoa mean

A

mooult entire non living cuticle and also lack primary larva

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3
Q

what are the extant phyla of panarthropoda

A

tardigrada
onychophora
arthropoda

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4
Q

what percent of animals does panarthropoda make up

A

more than 80

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5
Q

how do panarthropoda differ from other ecdysozoans

A

segmented bodies w pairs of libs

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6
Q

what characterizes limbs of panarthropoda

A

they can be jointed or they can be lobopods

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7
Q

lobopods

A

fleshy unjointed outpocketings

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8
Q

what was envisioned as transitional taxon that joined annelids and arthropods

A

Onychophora

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9
Q

is Onychophora actually the transitional taxon b/w annelids and arthropods?

A

no, just close relationship b/w arthropoda and Onychophora

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10
Q

tardigrada

A

water bears

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11
Q

tardigrada how many spp

A

1200

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12
Q

tardigrada habitat

A

terrestrial in wet soil and moss

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13
Q

what describes tardigrada head

A

no antennae

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14
Q

what describes tardigrada body and limbs

A

four body segments w paired lobopod limbs that have distinc claws

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15
Q

how does tardigrada move

A

slow stepping motion

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16
Q

what systems do tardigrada lack

A

circ and excretory system

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17
Q

tardigrada coelom

A

small eucoelom that surrounds gonals
majority of euceolem haemocoel

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18
Q

what muscles do tardigrada have

A

lack circular muscles but have muscles bands that attach to cuticle

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19
Q

tardigrada nervous system

A

dorsal brain w circumoesophageal connectives and pair of ventral nerve chords

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20
Q

what are tardigrada eyespots

A

non image forming inside the brain

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21
Q

tardigrada feeding

A

feed on bacteria, algae, decaying plant matter, small invertebrates via sucking

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22
Q

what characterizes tardigrada pharynxq

A

muscular b/c sucking

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23
Q

tardigrada sexes

A

parthenogenic with few hermaphroditic

24
Q

4 ways sperm is transfered in tardigrada w diff sexes

A

1) into females genital opening
2) hypodermic insemination- pierces cuticle and deposit sperm
3) male stimulates female to oviposit, then smears sperm over eggs
4)male copulates with moulted cuticle and female oviposits in old cuticle

25
Q

what type of fertil;ization tardigrada

A

external or internal

26
Q

development tardigrada

A

direct

27
Q

tardigrada howq do they grow

A

eutely

28
Q

tardigrada eggs

A

highly resistant

29
Q

why is lifespan for tardigrada so long

A

they are masters of cryptobiosis

30
Q

cryptobiosis

A

state where mf alive but no metabolism

31
Q

what is a form of cryoptobiosis used by tardigrada

A

anhydrobiosis

32
Q

what is anhydrobiosis

A

where all water is eventually lost from animal

33
Q

what are tardigrada resistant to

A

outerspace, manny environmental stresses and absence of water

34
Q

phylum onychophora

A

velvet worms

35
Q

onychophora spp

A

200

36
Q

onychophora habitat

A

only entirely terrestrial phylum of animals

37
Q

head of onychophora

A

one pair of antennae

38
Q

body of onychophora

A

homonomous segment with 1 pair of lobopod limbs tipped w claws

39
Q

what types of muscles onychophora

A

circular, longitudinal, dorso ventral, also have metanephridisa

40
Q

coelom of onychophora

A

restricted to pockets around gonalds and haemocoel

41
Q

circ system onychophora

A

open but they have heart

42
Q

onychophora nervous system

A

dorsal brain and paired ventral nerve chords

43
Q

eyes onychophora

A

have very small eyes

44
Q

how do onychophora exchange gasses

A

tracheal system with spiracles or stigmata

45
Q

stigmata or spiracles

A

opening in side of body

46
Q

what do stigmata lead to in tracheal system

A

tracheae(large tubes)

47
Q

onychophora feeding

A

predators

48
Q

how do onychophora capture food

A

glue glands that spray glue

49
Q

development onychophora
What are young worm born w

A

direct
young worms born w full num howsegments

50
Q

how is copulation done

A

hypodermic insemination

51
Q

different types of reproduction female onychophora

A

oviparity
ovoviviparity
viviparity

52
Q

oviparity

A

lay eggs outside body

53
Q

ovoviviparity

A

eggs retained in mother until hatch or right before hatch

54
Q

viviparity

A

no egg but young develop inside mommy

55
Q

onychophora cleavage

A

neither spiral or radial
have intralecithal cleavage

56
Q

what happens in viviparous spp

A

yolkless egg attaches to wall and nourishes via placental connection

57
Q
A

ZOOL 250 lectures 13-28 (18 decks)

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