arthropods

Question 1

what are some characteristics of the body plan of the onchyphora

Answer 1

it is segmented with paired appendages, has a complete gut, has a thick, chitinous and permeable cuticle, has a paired ventral nerve cord and has a reduced coelum

Question 2

what type of circulation does the onchyphora have

Answer 2

open circulation with a large haemocoel to bathe all the organs in blood

Question 3

what are some characteristics of the oncyphora internal anatomy

Answer 3

has paired ovaries and a uterus, the spermatophore is attached to the female body, and it has a ladder like nervous system

Question 4

how many segmented pairs of legs does the tardigrada have

Answer 4

4 pairs of legs (lobopods) with claws

Question 5

what type of ocelli does tardigrada have and what does this mean

Answer 5

has simple ocelli, meaning it has rudimentary vision

Question 6

what is some of the characteristics of the internal anatomy of a tardigrada

Answer 6

no heart, nephridia or gas exchange system, has malphigian glands, has a hydrostatic skeleton, has a stylet for feeding, and its CNS is ladder like

Question 7

what are some basic characteristics for the arthropoda

Answer 7

tripoblastic and bilaterally symmetrical, body segmented into a head and a trunk, every segment has a pair of legs, compound eyes, open circulatory system, and has a complete gut

Question 8

what are some characteristics of the generalised arthropod

Answer 8

dorsal heart with open circulatory system, paired ventral nerve cord, and muscle attachments to the rigid exoskeleton

Question 9

what is the arthropod cuticle made up of

Answer 9

chitin

Question 10

what are the 2 types of cuticle and what do they do in arthropods

Answer 10

epicuticle, is a thin waterproof layer. and procuticle made up of the exo and endocuticle that is thick and strong for support

Question 11

what are the chitinous projections from the cuticle called in arthropods

Answer 11

seta

Question 12

what are arthropods limbs made up of

Answer 12

protopod (coxa and basis), exopod (lateral), and endopod (medial, ischum, merus, carpus, propodus, and dactyl)

Question 13

what is the arthropod gut made out of

Answer 13

foregut, midgut and hindgut

Question 14

what structures can an arthropod gas exchange system be made up of

Answer 14

gills (for aquatic species), book lungs (for dry environments), and tracheae (air filled tubes in insects)

Question 15

how do arthropods excrete waste

Answer 15

by diffusing nitrogenous waste across gills or body into environment.

Question 16

what are some characteristics of the cheliceriforms

Answer 16

have 2 tagmata (prosoma and opisthoma), have prosomal appendages, use both book gills and book lungs or tracheae, and excretion is one through the Malpighian tubules

Question 17

what are some common features of arachnids

Answer 17

mostly terrestrial meaning has a waxy cuticle, has 2 tagmata (cephalothorax anterior and abdomen posterior), digestion begins in the preoral cavity, has sense organs called sensory setae, eyes and slit sense organs, and is dioeceous.

Question 18

what are some external features of scorpions

Answer 18

specialised opisthosoma, and has pectines that sense vibrations

Question 19

what is some of the external anatomy of a spider

Answer 19

the pedipalps that help in feeding and reproduction and spinnerets

Question 20

wat does the principle eye do in spiders

Answer 20

is most visually acute and has a wide depth of colour field (if present)

Question 21

what does the secondary eye do

Answer 21

contains a tapetum to double sensitivity to light