《人体寄生虫学 Human parasitology》课程教学课件（讲稿）Lectures 18 Mosquitoes

广Medical Arthropod

Medical Arthropod

MEDICALARTHROPODArthropods which has medicalimportant, they can act as bothMedicalarthropodparasites and vectorsFleaplague（鼠疫）VectorFlyMyasis,Cholera（霍乱）malaria（症疾）Mosquito

Characteristics of Arthropoda

Characteristics of Arthropoda

Metamerism(体节性)Metamerism- body is segmented.ESSS

Metamerism (体节性) • Metamerism- body is segmented

Exoskeleton(外骨骼)Exoskeleton- body covered with a hardexternal skeleton

Exoskeleton(外骨骼) • Exoskeleton- body covered with a hard external skeleton

Bilateral SymmetryBilateral Symmetry- body can be dividedinto two identical halves1/21/2

Bilateral Symmetry • Bilateral Symmetry- body can be divided into two identical halves

Jointed Appendages Jointed Appendages- each segment mayhave one pair of appendages, such as:legswings mouthpartsJointedAppendage

Jointed Appendages • Jointed Appendages- each segment may have one pair of appendages, such as: • legs • wings • mouthparts

Open Circulatory System: Open Circulatory System- blood washesover organs and is not entirely closed byblood vessels. Our system is a closed oneCirculatory SystemAccessoryPulsatileOrganHeartAorta

Open Circulatory System • Open Circulatory System- blood washes over organs and is not entirely closed by blood vessels. Our system is a closed one

Life cycle:The life cycle of arthropods is divided into two maintypes:1. Incomplete metamorphosis:Egg → Nymph → Adult.(Arachnid type: EggLarvaNymph → Adult)2.Complete metamorphosissEgg → Larva → Pupa → Adult

Life cycle: The life cycle of arthropods is divided into two main types: 1. Incomplete metamorphosis: Egg → Nymph → Adult. (Arachnid type: Egg→Larva→Nymph → Adult). 2. Complete metamorphosis: Egg → Larva → Pupa → Adult

Five classes ofArthropod have medicalClassificationimportantInsecta:mosquito,fly,sandfly,flea,louce,cockroach, etcArachnid:ticks,mites,spiders,etcCrustacea:crab, shrimp,cyclops,copepod,etcChilopoda（唇足纲）：centipede（蜈）Diplopoda（倍足纲）：millipede（马陆）