Biodiversity - Anthropods and Echinoderms Flashcards
true of false, the white shark is a vertebrate?
true
true of false the northern pacific sea start is a invertebrate?
True
how many species are there of anthropods?
1,000,000
examples of anthropods
3
lobster, spider, insects
are anthropods invertebrates?
yes
what are the features of an anthropod?
(insects, lobsters, spiders) 5
- jointed legs
- jointed exoskelton
- waterproof cuticle
- paired legs
- developed brain
how does the anthropod (cricket) gut work?
3 steps
- food moves from mouth to fore gut
- crop stores and moisturises food and sends it to the mid gut
- then to hind gut where absorbtion and digestion occur
what type of heart do anthropods have?
dorsal heart with open system
what are the 4 main types of anthropod?
- insects
- myriapods
- Chelicerata
- crustaceans
examples of chelicerates
(anthropods) 3
- spider
- horeseshoe crabs
- ticks
features of chelicerates
(anthropods) 4
- cephalothorax and abdomen fused
- no antennae
- 4 legs and 2 feeding appandages
- no legs on the abdomen
examples of crustaceans
(antropods) 2
- lobsters
- crabs
features of crustaceans
(anthropods) 6
- 2 pairs of antennae
- 3 sections
- lots of mouth parts
- thorax has legs
- abdomen has swimming appendages
- pincers
examples of Myriapoda
(anthropods) 2
- centipedes
- millipedes
features of Myriapoda
(anthropods) 1
- highly segmented
features of insects
(antropods) 8
- 3 regions
- no legs on the abdomen
- 1 pair of antennae
- spiracles
- efficent gas exchange
- sophisticated sensory organs
- well developed brain
- wings
what was the first organsim to develop wings? why were they useful?
- insects
- they could fill different arial niches
what do wings allow?
3
- escape from pedators
- finding food
- finding mates
what made wings possible in insects?
5
- muscel tissue
- lightweight
- small
- efficent gas exchange
- nervous and sensory systems for navigation
true of false anthropods are deutrosomes?
false, theyre protostomes
when did echindoderms and chordates seperate?
500 million years ago
are echindoderms and chordates protostomes or deuterostomes?
deuterostomes
what are the features of deuterostomes?
4
- cell cleavage is radial (divide up)
- cell fate indeterminate
- body cavity from endoderm
- anus forms before mouth
examples of echinoderms
(deuterostomes) 2
- star fish
- sea urchin
how many species are there of echinoderms?
star fish and urchins
7000
features of echinoderms
5
- adults radially symetrical
- larvea bilaterally symetrical
- 5 arms (pentamerously symmetrical)
- endoskeleton made of calcareous plates
- have canals and tubes
what are the 3 systems in enchinoderms?
- digestive
- reproductive
- water vasular system
how does digestion work in echinoderms?
3 steps
- first stomach sits out of mouth (digestion starts outside the body)
- food goes up into upper stomachwhere digestion carries on
- the food goes down arms where absorbtion occurs
what type of fertilisation do enchioderms use?
external
features of chordata class
- notochord
- dorsal hollow nerve chord
- pharyngeal slits
- muscular post anal tail
example of a chordata
sea squirt
true or false vertebrates are chordates?
true
how many different species are there of vertebrates?
40,000
features of vertebrates
- well developed brain
- sensory organs
- closed circulatory system
- vertebral column forms main body axis
