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Che Lice Rates

Dec 21, 2015



Che Lice Rates

  • C H E L I C E R AT E S

    A B H I S H E K M A T H E W, M A T T H E W T S O I , X U H U I Z H O U , R YA N W A K E H A M

  • C L A S S I F I C AT I O NR YA N W A K E H A M

  • Domain: Eukarya

    Multicellular with cells that contain a nucleus and membrane bound cell bodies

    Dueterostomes or Protostomes?

    Chelicerates fall under the protostomes as during the embryonic phase, their blastophore form mouths first.

  • Supergroup: Ecdysozoa

    Chelicerates are classified under Ecdysozoa as they molt their cuticle layers (ecdysis) as they grow

    These cuticle layers contain chitin as well as other proteins

    Phylum: Arthropods

    Classified as Arthropods because of their segmented bodies and heads and jointed legs

  • Chelicerata:

    The Chelicerates, similarly to most other arthropods, have segmented bodies, however, are separated differently. They have an anterior cephalothorax and a posterior abdomen. Chelicerates lack antennae and most have simple eyes (eyes with a single lens)

    Chelicerae are claw like feeding appendages located near the mouth. Chelicerae can serve as pincers or fangs and are what give Chelicerates their name

  • Some types of Chelicerate: Marine chelicerates are horseshoe crabs and sea spiders

    Earliest chelicerates were eurypterids (water scorpions). Most marine chelicerates, including all of the eurypterids, are now extinct

    Arachnids (Spiders, scorpions, ticks, and mites)

    Parasitic arthropods: Ticks and mites; nearly all ticks and parasitic mites are parasites that feed off of the blood of their host (Ticks target mammals and reptiles; Parasitic mites target vertebrates, invertebrates, and plants).

  • T H I S W E E K S W AT C HS P I D E R R A P S O N G - H A I L E Y F T. B R O O K E F R O M S C I E N C E C L A S S

  • A N AT O M YM A T T H E W T S O I

  • A R T H R O P O D A : C H E L I C E R AT E S

    As Arthropods, Chelicerates have:

    Segmented bodies

    Segmented heads

    Jointed limbs

    Cuticles containing Chitin

    A small coloem

    Open Circulator system

  • S P E C I F I C T O C H E L I C E R AT E S

    Appendages in front of their mouths called Chelicerae

    The Chelicerates body plan contains two of a segment called tagmata: the cephalothorax, and the abdomen

    Pedipalps which are an additional pair of appendages in front of the legs specific to Chelicerates

  • As arthropods, Chelicerates contain several body components as other arthropods

    Like most arthropods, terrestrial Chelicerates breathe through malphigian tubules and have a cloaca to excrete waste and their marine counterpart have gills

    Their exoskeletons are made of chitin and are sectioned off into segmented portions

    However, unlike the rest of the arthropods, Chelicerates have special mouthparts called Chelicerae where they get their name

  • S E G M E N TAT I O N

    Chelicerates are divided into 2 parts: The cephalothorax, and the abdomen

    The cephalothorax in chelicerates is difference to that of other arthropods

    A cephalothorax is the combination of the head and thorax seen in other arthropods

    The cephalothorax contains a few major components such as the brain while the abdomen contains most of the other major organs such as the stomach and heart

  • C H E L I C E R A E

    The word Chelicerae is derived from a Greek term meaning,Claw Horns

    There are 3 kinds of Chelicerae, jackknife, scissor, and the 3-segmented chelate

    Jackknife Chelicerae are most commonly found in spiders

  • Scissor Chelicerae are found on pseudoscorpions and some spiders

    3-segmented Chelates occur on most other Chelicerates

    In spiders, the Chelicerae contain the fangs and aid with the eating process

  • P E D I PA L P S

    The Pedipalps are a pair of appendages unique to the Chelicerates

    They generally exist in front of the mouth and a various different uses

    In spiders, the pedipalps help with sensory and moving food towards the Chelicerae and mouth

    In scorpions, the pedipalps are their large front claws which are also known as Chelae

  • E C O L O G YX U H U I Z H O U

  • A C A R I ( M I T E S & T I C K S )

    Found among a large group of vertebrate hosts

    Moist forests and areas of vegetation are most productive regions for ticks

    Mites are found in a broad area of habitats including saline and fresh water, soils, plants and animals (humans too)

  • A R A N E A E ( S P I D E R S )

    Spiders construct silk characterized by its species and can use it to build perfect webs in their first try, to cover their eggs, catch insects and even as a gift wrap for food to give to the ladies during courtship.

  • S C O R P I O N E S ( S C O R P I O N S )

    Scorpions are primarily nocturnal

    Mainly found in tropics and subtropics but some in temperate; especially deserts

    Usually stay in underground burrows in day as it retain a higher humidity, lowers temperature and protects

    Uses neurotoxin venom that causes paralysis to kill prey

  • M E R O S T O M AT I D S ( H O R S E S H O E C R A B S )

    Horseshoe crabs are omnivorous scavengers and feed on small bivalves, mollusks, worms, dead fish and algae.

    The 4 remaining species are found in the coastal waters of Asia from India to Japan & the Atlantic coastline of North America

  • P Y C O G O N I D S ( S E A S P I D E R S )

    Found in all oceans, especially polar areas

    Most are carnivorous, and feed on bryozoans, hydroids and polychaetes

  • S I G N I F I C A N C EA B H I S H E K M A T H E W

  • They are known to be scary..

  • E C O L O G I C A L A N D H U M A N I M PA C T S

    Over half the chelicerates contribute to human harm, including death

    Used until the 1970s as a cheap fertilizer

    Their blood or components are used to produce pharmaceuticals and perform research

    Many are used as bait for eels, conch and whelk

  • They are important food sources (loggerhead and turtles)

    Their eggs are also a food source for migrating birds

    Venom from the death stalker scorpion and the black widow spider are being used to create new treatments for cancer and Alzheimer's Disease.

    Spiders produce silk that is tougher than Kevlar (which has instigated research into super-strong materials)

  • Spiders have over 50,000 described species. Mites and ticks have around around 48,200 species and 1200 species of scorpions

    Ticks and mites transmit a greater variety of human and animal pathogens than any other arthropod agent (e.g Lyme disease tick)

    Mites and ticks are all over place, in your homes, outside, everywhere

  • D O W E R E A L LY H AV E B U G S L I V I N G I N O U R E Y E B R O W S ?

    YES!! Our skin is covered with crawling mites.

    Humans host two species of mites: face mites or follicle mites

    Humans are born mite free but over time, they are infested

    They are also spread by contact

  • When you walk through a spiderweb, you instantly master Kung Fu

  • R E F E R E N C E S Arachnida - Spiders, Ticks, Mites, Chiggers, Scorpions, Whipscorpions, Pseudoscorpions, Daddy longlegs, Harvestmen, Arachnidae -- Discover

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    The deadly venom being used as medicine - Telegraph. (n.d.). Retrieved from

    Carrera P.C, Mattoni C. I, Peretti A. V, (25 December 2008). Chelicerae as male grasping organs in scorpions: sexual dimorphism and associated behavior. Retrieved from

    Dolphin, W. D., & Vleck, D. (2015). Biological investigations: Form, function, diversity, and process (10th ed.). Boston: McGraw Hill.

    Dunlop J. A. (13 January 2010). Arthropod Structure & Development. Retrieved from

    I TOLD YOU NOT TO DO THAT - OFFICIAL VIDEO. (n.d.). Retrieved November 12, 2014, from

    The Earthlife Web - Sea Spiders: Class Pycnogonida. (n.d.). Retrieved from

    The Earthlife Web - The Scorpion Page. (n.d.). Retrieved from

    Mite (arachnid) -- Encyclopedia Britannica. (n.d.). Retrieved from

    Joke Spider | Kappit. (n.d.). Retrieved November 12, 2014, from

    Reece, J. B., & Campbell, N. A. (2011). Campbell biology: Jane B. Reece ... [et al.]. Boston: Benjamin Cummings.

    Spider Rap Song, Advanced Science Project. (n.d.). Retrieved November 12, 2014, from

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