Intro to Zoology
Week 10
(10/25-10/27)
(10/29-test)
October 25, 2004
EXAM – this Friday – 29th Class cubozoa through oct 27th (Joe’s 23rd BDAY)
Pedipalps – hold prey Chelicerae – inject fluids into prey (toxins) Synap’s of spiders – SILK Some spiders’ solitary (ex. Wolf Spider) Some spiders’ communal
Order Opiliones “Harvestmen” à Daddy longlegs Predaceous
Order Acarina or Acari (Ticks & Mites)
Mite #1à Sarcoptes scabei (mite)
8 legs – Adult 6 legs- Nymph
Mite #2 à Demodex folliculorum
Canids – Demodectic Mange Demodex caninum
A micrograph of Demodex canis
Mite #3 à Trombicula Chigger mite Free living adults (not parasitic)
A larval chigger mite – count the legs!
Adult Chigger mite – a trombiculid.
Tstsugamuchi Fever Rickettesia
Orabatid Mites Family Orabatidae - Free living - Intermediate host for cestodes
Mites Ticks
Small Large No Hallers Organ Hallers Organ Sensory??? No hypostome Large hypostome visible
Exanguinated – take all blood out ----refers mostly to blood sucking organisms
à Ixodid – hard tick à slow feeders – Ixodidae à Argasid - soft tick à Raptorial feeders (In fast/Out fast) – Argasidae
Ticks are good vectors of disease
- Spirochaetes - Ehrlichia – bacteria - Babesiosis – protozoan “Black Water Fever”
***Dermacentor variabilis
Ixodes scapularis – a vector of Borellia burgdorferi – lyme diseas
à Rocky Mountain Spotted Fever Rickettesia Reservoir host – maintains parasite in a natural system Rodents Below the images were Stolen from the CDC
Approximate distribution of the American dog tick
American dog tick (Dermacentor variabilis )
Rocky Mountain wood tick (Dermacentor andersoni) is found in the Rocky Mountain states and in southwestern Canada. The life cycle of this tick may require up to 2 to 3 years for completion. Adult ticks feed primarily on large mammals. Larvae and nymphs feed on small rodents.
Approximate distribution of the Rocky Mountain wood tick
October 27, 2004 (Joe’s Bday)
Phylum Arthropoda Sp. Chelicerata Sp. Crustacea Sp. Uniramia – One part appendages A millipede - diplopoda Class Diplopoda (Millipedes)
· 2 sets legs/segment · Herbivorous · Scavengers
Class Chilopoda (Centipede)
· Dorsal ventrally flattened · 1 set leg/segment · Predaceous
a centipede ! Note the difference between this and a millipede!
Class Insecta
· 3 distinct body segments o Head o Thorax o Abdomen
Class Hexapoda
· 6 legs (synap)
Insects in General
· primarily terrestrial · Freshwater o Few Marine forms ***Powered flight ***2/3 of all flowering plants are “insect pollinated”. Ex. of pollinators Bees, flies, moths, butterflies, beetles
Morphology of Insects
High Speed Sphinx Moth! The fastest of the insects!
Order Lepidoptera (moths, butterflies)
Sphinx Moth & Hummingbird Moth (SAME THING) Homoeothermic –maintain body temp ~30 mph (speed)
COMPLETE METEMORPHESIS Eggà Larva à Pupa à Chrysalis à Adult
INSTAR – as grows cuticle is shed
Fitness refers to the number of offspring that are left to the next generation.
If an individual has high fitness – then it left many offspring to the next generation! You can indirectly increase your fitness by helping your sister or brother raise their kids successfully because your genes are then transmitted successfully into the next generation!