The Phylum Arthropoda

Front 1

Subphylum Trilobita

Back 1

1. Extinct.
2. Three tagmata; head with compound eyes, antennae present, the thorax and epygidium (fused appendages at the rear), other appendages biramous.
3. marine bottom feeders

Front 2

Subphylum Cheliceriformes

Back 2

1. first pair of appendages are chelicerae (pincer like), second pair are pedipalps
2. antenna absent
3. prosoma - no head/thorax division
4. four pairs of walking legs

Front 3

Subphylym Crustacea

Back 3

1. first segment bearing a pair of antennae (two pairs total)
2. other appendates biramous and differentiated

Front 4

Subphylum Uniramia

Back 4

Myriapoda and insects
1. Trachea and malpigian tubules
2. uniramous appendaegs
3. Class Insecta: head, thorax, abdomen
4. Class Myriapoda: head, elongated trunk with many pairs of legs
5.

Front 5

Class Insecta

Back 5

1. three pairs of walking legs and often two pairs of wings in the thoracic region.
2. head has a single pair of antenae and a pair of compound eyes

Front 6

Subphylum Cheliceriformes
Subclass Merostomata
Order Xiphosura

Back 6

horshoe crabs
1. cephalothorax wide, arched
2. merostomata have a continuous dorsal carapace present; abdomen with gills and posterior telson

Front 7

Subphylum Cheliceriformes
Class Merostomata
Subclass Arachnida (8 legs)
Order Scorpiones

Back 7

True scorpions.
1. segmentation of the opisthosoma, prosoma to stinger; divided into two portions
2. maternal care for young
3. nocturnal predators with a stinging apparatus that contains a neurotoxin

Front 8

Subphylum Cheliceriformes
Class merostomata
Subclass Arachnida
Order Uropygi

Back 8

Whip scorpions and viegaroons
1. long conspicuous telson
2. tropical habitat
3. nocturnal with ability to spray acid from gland near anus

Front 9

Subphylum Cheliceriformes
Class merostomata
Subclass Arachnida
Order Amblypgi

Back 9

Tailless whip scorpions and whip spiders, nocturnal and occur in caves and other humid places

Front 10

Subphylum Cheliceriformes
Class merostomata
Subclass arachnida
Order Pseudoscoprionida

Back 10

false scorpions.
1. Chelicerae with silk glands and pedipalps with poison glands, very small

Front 11

Subphylum Cheliceriformes
Class merostomata
Subclass Arachnida
Order Araneae

Back 11

Spiders
1. Opisthosoma is unsegmented, eight simple eyes.
2. six spinnerets that weave silk
3. females are generally larger than males and mating sometimes involves very elaborate courtship
4. all are predatory

Front 12

Subphylum Cheliceriformes
Class merostomata
Subclass Arachnida
Order Opiliones

Back 12

harvestmen and daddy long legs
1. cephalothorax and abdomen are joined, fused
2. body rounded or oval, with the prosoma and opisthosoma broadly joined
3. two eyes generally located on each side of a median elevation

Front 13

Subphylum Cheliceriformes
Class merostomata
Subclass arachnida
Order Acari

Back 13

1. Ticks and mites
2. cephalothorax and abdomen broadly joined
3. abdomen unsegmented
4. many are parasitic
5. disease vectors

Front 14

Subphylum Cheliceriformes
Class merostomata
Subclass Arachnida
Order Solifugae

Back 14

Sun spiders
1. prosoma with segmented abdomen
2. 4 pairs of legs, but the first pair are small, ex camel spider
3. large chelicerae

Front 15

Subphylum Cheliceriformes
Class pycnogonida

Back 15

Sea spider
1. very long legs relative to body size
2. cephalothorax dwarfs abdomen
3. gills, unique among arthropods in their possession of a proboscis, ovigers for brooding eggs in males

Front 16

Subphylum Crustacea
Order Decapoda

Back 16

name means 10 legs, and they all have 5 pairs of legs on the last five pairs of thoracic segments
2. front three pairs are used as mouthparts
3. in many one pair has enlarged picners
4. biramous appendages

Front 17

Subphylum crustacea
Class isopoda

Back 17

1. seven pairs of legs
2. two pairs of antennae but the first pair is reduced
3. body is divided into three regions, cephalon, pereon, and pleon
4. appendages of pleon called pleopods are specialized for respiratory function

Front 18

Subphylum Unirama
Class myriapoda
Order Chilopoda

Back 18

centipede
1. one pair of legs per segment
2. pair of venom claws

Front 19

Subphylum uniram
class myriapoda
subclass diplopoda

Back 19

Millipedes!
1. two pairs of legs per segment
2. most are herbivorious