Transcript 1-arthropods-crayfish

Japanese Beetle
http://www.youtube.com/watch?v=ih_98UtAJSQ&feature=youtu.be
Fun Facts
http://www.bukisa.com/articles/41743_amazing-facts-about-arthropods
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Aphids are born pregnant without the benefit of sex – they can
give birth 10 days after being born themselves
Bedbugs can survive a year without feeding (man – 40 days
no food)
Typical bed usually houses have over 6 million dust mites
Ants don’t sleep
Mosquitoes dislike citronella – irritates their feet (love
bananas though). By the way, they prefer blondes. Favorite
color is blue
Bees 4 wings move 11,400 strokes/min; fly 15 miles / h
Largest cockroach measures 9.68 cm (3.81 inches)
Queen bee lays fertilized eggs – the first queen that emerges
destroys the rest
Black widow venom is more potent than that of a rattlesnake
Phylum Arthropoda
Arthropods
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Make up about 80% of the known animal
species
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Insects are by far the most common species of
arthropods
Arthropod means joint footed
Range from the deep sea to mountain peaks
Bilateral symmetry
Growth requires molting
General Arthropod Characteristics:
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Arthropods have:
1. Exoskeleton:
 - Most prominent characteristic is their outside skeleton, or
exoskeleton.
 - Exoskeleton provides support, protection and attachment site for
muscles. Made of protein and chitin
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Chitin is a strong, flexible, polysaccharide
- All arthropods molt, or shed their exoskeletons periodically. After it
molts, it grows before the new skeleton hardens.
Skin glands digest the inner part of the exoskeleton and other glands
secrete the new one.
2. Segmented Bodies
 - Have segmented bodies that show various patterns of segment
fusion ( tagmosis) to form integrated unit like the head, adbomen, ...
3. Jointed Appendages
 - Have joints between body sections (includes legs and antennae)
 - Have jointed appendages (a structure such as a leg that grows out
from the main part of the body)
Characteristics cont…
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Cephalization is more prominent than in annelids
(brain and complex sense organs in the head
region)
Special organs sense touch, vibration, and
chemicals. The eyes of many arthropods are
particularly specialized.
Open circulatory system. The dorsal heart pumps
blood from the posterior end of the animal to the
anterior end.
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- Blood moves through the hemoceol (major body cavity)
Phylum Arthropoda –
2 Subphylum
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Subphylum Chelicerates
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Class Arachnida
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Spiders, scorpions, mites, ticks
Subphylum Mandibulates: (4 major classes)
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Class Crustacea
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Class Chilopoda
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Centipedes
Class Diplopoda
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Crayfish, Crab, Lobster
Millipedes
Class Insecta
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Insects
Subphyla Chelicera
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Chelicera are pointed appendages (modest
pinchers) used for feeding and manipulating
food (in lieu of chewing mandibles)
The body of chelicerates has two major parts:
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1. The cephalothorax is a fused section composed
of the head and any body segments that have legs
attached.
2. The abdomen consists of posterior segments
that contain most of the internal organs.
Lack antennae
Nearly all have 4 pairs legs
Subphyla Mandibulata:
Unlike chelicerates, mandibulates have mandibles, or jaws, for chewing food.
All mandibulates have antennae –
segmented sense organs on the head
Three distinct body regions
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- head, thorax, abdomen
They have three or more pairs of walking
legs
Subphyla Mandibulata:
Class Crustacea
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Crustaceans typically have:
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- two pairs of antennae
- two or three body sections
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Cephalothorax – head fused with the thorax
- chewing mouthparts called mandibles.
- 5 or more pairs of legs
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Primarily aquatic, few terrestrial
The Crustaceans:
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Crayfish dissection on Friday!
What to look for: Male vs Female
Assignment
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Complete coloring assignment
Pre-Lab reading for Crayfish dissection