Zoology Lab 7: Small Ecdysozoans and Arthropods

Superphylum Ecdysozoa

Phylum Onychophora

A: Antennae

B: Mouth

C: Oral Papillae

What Superphylum and Phylum is this organism in?

What is A, B, and C pointing to?

Superphylum Ecdysozoa

Phylum Tardigrada

What Superphylum and Phylum is this animal in?

Superphylum Ecdysozoa

Phylum Arthropoda

Class Trilobita

What Superphylum, Phylum, and Class is this organism in?

Phylum Arthropoda, Subphylum Celicerata, Class Merostomata

A: anus

B: swimmerets

C: book gills

D: Legs

E: pedipalps

F: chelicerae

Left side is male, right side is female

What Phylum, Subphylum, and Class is this animal in?

What is A, B, C, D, E, and F pointing to?

What side is male and what side is female?

Phylum Arthropoda

Subphylum Celicerata

Class Merostomata

A: simple eyes

B: compound eyes

C: opisthosoma

D: telson

E: prosoma

What Phylum, Subphylum, and Class is this animal in?

What is A, B, C, D, and E pointing to?

How do you tell the difference between a male and female Merostomata?

Males has modified pedipalps that look like thumbs

Phylum Arthropoda

Subphylum Chelicerata

Class Merostomata

What Phylum, Subphylum, and Class is this larva in?

Phylum Arthropoda

Subphylum Chelicerata

Class Arachnida

A: Chelicerae

B: pedipalps

What Phylum, Subphylum, and Class is this animal in?

What is A and B pointing to?

Phylum Arthropoda

Subphylum Chelicerata

Class Arachnida

Latrodectus mactans (“black widow spider”)

What Phylum, Subphylum, and Class is this animal in? What’s the scientific name?

Phylum Arthropoda

Subphylum Chelicerata

Class Arachnida

A: walking legs

B: chelicerae

C: pedipalps

What Phylum, Subphylum, and Class is this animal in?

What is A, B, and C pointing to?

Phylum Arthropoda

Subphylum Chelicerata

Class Arachnida

Loxosceles reclusa (“Brown Recluse”)

What Phylum, Subphylum, and Class is this animal in? What’s the scientific name?

Phylum Arthropoda

Subphylum Chelicerata

Class Arachnida

A: chelicerae

B: pedipalps

What Phylum, Subphylum, and Class is this animal in?

What is A and B pointing to?

Phylum Arthropoda

Subphylum Chelicerata

Class Arachnida

What Phylum, Subphylum, and Class is this animal in?

Phylum Arthropoda

Subphylum Chelicerata

Class Arachnida

Demodex

Tick

What is the Phylum, Subphylum, Class, and Genus of this animal?

What is it's common name?

Phylum Arthropoda

Subphylum Chelicerata

Class Pycnogonida

What is the Phylum, Subphylum, Class, and Genus of this animal?

Phylum Arthropoda

Subphylum Myriapoda

Class Chilopoda

Centipede

Poison claw

1 pair

What is the Phylum, Subphylum, Class, and common name of this animal?

What is the arrow pointing to?

How many pairs of legs are there per segment?

Phylum Arthropoda

Subphylum Myriapoda

Class Diplopoda

Millipede

A: thoracic segment

B: diplosegment

2 pairs

What is the Phylum, Subphylum, Class, and common name of this animal?

What is A and B pointing to?

How many pairs of legs are there per segment?

Phylum Arthropoda

Subphylum Hexapoda

Class Insecta

Grasshopper

A: head

B: thorax-- prothorax, mesothorax, metathorax

C: Abdomen

D: forewings

E: hindwings

What is the Phylum, Subphylum, Class, and common name of this animal?

What is A, B, C, D, and E pointing to? List the thorax subsegments in order from top to bottom.

Identifying characteristics of Phylum Onychophora (Under Superphylum Ecdysozoa)

-Soft flexible cuticle with chitin
-Growth by molting (no exuvia/exoskeleton)
-Unsegmented body
-Paired unjointed appendages with claws
-1 pair antennae
-1 pair mandibles and 1 pair oral papillae

Identifying characteristics of Phylum Tardigrada (Under Superphylum Ecdysozoa)

-Thin flexible nonchitinous cuticle
-Growth by molting
-Unsegmented body
-4 pairs unjointed appendages each with 4-8 claws

Identifying characteristics of Phylum Arthropoda (Under Superphylum Ecdysozoa)

-Hardened chitinous exoskeleton
-Paired jointed appendages
-Anterior appendages modified into feeding structures
-Segmented body
-Reduced coelom is a hemocoel with dorsal heart
-Complete digestive tract
-Well developed nervous system with paired ventral ganglia and well developed sense organs- muscles in bundles rather than layers

Characteristics of Class Trilobita (EXTINCT) (under Phylum Arthropoda)

-Body plan: head, thorax, pygidium
-Compound eyes
-Antennae
-Mandibles for feeding
-Branched (biramous) appendanges
-Respiration by gills
-Able to roll up like pill bugs

Subphylum Chelicerata (Under Phylum Arthropoda) (spiders, horseshoe crab, scorpions, mites, ticks)

-Body plan: cephalothorax, abdomen

-Most lack compound eyes

-No antennae

-Chelicerae for feeding (no mandibles)

-Four pairs of unbranched legs

-Respiration by gills, book gills, book lungs, or tracheae

Subphylum Myriopoda (Under Phylum Arthropoda) (centipedes, millipedes)

-Body plan: head, long trunk

-Lack compound eyes

-Single pair of antennae

-Mandibles for feeding

-Unbranched legs on most segments

-Respiration by tracheae

Subphylum Hexapoda (Under Phylum Arthropoda) (insects)

-Body plan: head, thorax, abdomen

-Compound eyes

-Single pair of antennae

-Mandibles for feeding

-Three pairs of unbranched legs

-Two pairs of wings

-Respiration by tracheae

-Includes only invertebrates that can fly

Class Merostomata (Under Subphylum Chelicerata)

-Book gills for respiration

-Abdominal flaps for swimming (swimmerets)

-Simple eyes for navigation

-Compound eye for images

-Also known as horseshoe crabs

Class Arachnida (Under Subphylum Chelicerata)

-Chelicerae and pedipalps are variously modified

-Typically only ingest liquid food

-Also known as spiders, scorpions, ticks, mites, etc.

Class Pycogonida (Under Subphylum Chelicerata)

-Very narrow cephalothorax

-Tiny abdomen

-Additional prosomal appendages are ovigers
-Also known as sea spiders

Class Chilopoda (Under Subphylum Myriopoda)

-Head and trunk

-One pair of appendages per segment

-Poison "fangs" are actually claws (on first trunk segment)

-Carnivorous

-Also known as centipedes

Class Diplopoda (Under Subphylum Myriopoda)

-Head and short thorax

-2 pairs of legs per segment

-Herbivorous

-Also known as millipedes

Class Insecta (Under Subphylum Hexapoda)

-All have 3 pairs of legs on the thorax

-Most have 2 pairs of wings

-Prothorax: 1st pair of legs

-Mesothorax: 2nd pair of legs and 1st pair of wings

-Metathorax: 3rd pair of legs and 2nd pair of wings

-1st pair of wings: forewings

-2nd pair of wings: hindwings
-Also known as insects

American Horseshoe Crab scientific name?

Limulus polyphemus