9.3. PARASITES

3.      Arthropods of medical importance?

Arthropods play a significant role in medicine, both as direct agents of disease and as vectors transmitting various pathogens. Here's an elaboration on the provided list and their medical significance:

Myriapoda + Pentasomida+ Crustacea+ Chelicerata + Insecta 

1. Myriapoda

• Centipedes

• Centipedes:

  • Medical Significance: They possess venomous claws, and their bite can cause localized pain, swelling, and redness. Severe reactions are rare but can occur, especially in sensitive individuals.

2. Pentastomida

• Tongue worms 

• Tongue Worms:

  • Medical Significance: Some species can infect humans, causing a condition known as pentastomiasis. It's typically a zoonotic infection where humans are accidental hosts.

3. Crustacea

• Copepods + Decapods 

• Copepods:

  • Medical Significance: Some freshwater copepods serve as intermediate hosts for the Dracunculus medinensis, the causative agent of Guinea worm disease.

• Decapods (crabs, crayfish):

  • Medical Significance: Can act as intermediate hosts for various parasitic flukes that can infect humans.

4. Chelicerata

• Spiders+ Scorpions+ Mites+ Ticks 

• Spiders:

  • Medical Significance: While most spider bites are harmless, some spiders like the Black Widow or Brown Recluse can deliver medically significant bites causing local and systemic symptoms.

• Scorpions:

  • Medical Significance: Some species have potent venom that can lead to systemic symptoms and, in rare cases, death.

• Mites:

  • Medical Significance: Mites are responsible for conditions such as scabies (Sarcoptes scabiei) and can also cause allergic reactions.

• Ticks:

  • Medical Significance: Ticks are vectors for a variety of pathogens causing diseases like Lyme disease, Rocky Mountain spotted fever, and Tick-borne encephalitis, among others.

5. Insecta

• Flies + Mosquitoes + Lice + Fleas + Bugs + Stinging Insects 

  
  

• Flies:

  • Medical Significance: Certain flies serve as vectors for diseases. For example, tsetse flies transmit the parasites responsible for African sleeping sickness, and sandflies transmit Leishmania species.

• Mosquitoes:

  • Medical Significance: These are vectors for a plethora of diseases, including malaria, dengue, Zika virus, chikungunya, and West Nile virus, among others.

• Lice:

  • Medical Significance: They can transmit diseases like epidemic typhus and trench fever. Additionally, they cause direct infestations leading to itchiness and discomfort.

• Fleas:

  • Medical Significance: Fleas are vectors for the bacterium responsible for bubonic plague and can also transmit other pathogens.

• Bugs (Hemipterans like Triatomine bugs):

  • Medical Significance: These can transmit Trypanosoma cruzi, the causative agent of Chagas disease.

• Stinging insects (e.g., bees, wasps, hornets):

  • Medical Significance: Their stings can cause local reactions and, in sensitive individuals, severe allergic reactions or anaphylaxis.

Arthropods in Medicine

Myriapoda

• Centipedes

  • Medical Significance:

    • Possess venomous claws

    • Bite can cause localized pain, swelling, and redness

    • Severe reactions can occur in sensitive individuals

Pentastomida

• Tongue worms

  • Medical Significance:

    • Some species can infect humans

    • Causes pentastomiasis

    • Typically a zoonotic infection

Crustacea

• Copepods

  • Medical Significance:

    • Some freshwater copepods serve as intermediate hosts for Dracunculus medinensis

    • Causative agent of Guinea worm disease

• Decapods (crabs, crayfish)

  • Medical Significance:

    • Can act as intermediate hosts for various parasitic flukes

    • Flukes can infect humans

Mind Map: Medical Significance of Arthropods

4. Chelicerata

• Spiders

  • Medical Significance

    • Some spiders can deliver medically significant bites

    • Black Widow and Brown Recluse spiders

• Scorpions

  • Medical Significance

    • Some species have potent venom

    • Can cause systemic symptoms and death

• Mites

  • Medical Significance

    • Responsible for conditions like scabies

    • Can cause allergic reactions

• Ticks

  • Medical Significance

    • Vectors for various pathogens

    • Lyme disease, Rocky Mountain spotted fever, Tick-borne encephalitis

5. Insecta

• Flies

  • Medical Significance

    • Some flies serve as disease vectors

    • Tsetse flies transmit parasites causing African sleeping sickness

    • Sandflies transmit Leishmania species

• Mosquitoes

  • Medical Significance

    • Vectors for numerous diseases

    • Malaria, dengue, Zika virus, chikungunya, West Nile virus

• Lice

  • Medical Significance

    • Can transmit diseases like epidemic typhus and trench fever

    • Direct infestations causing itchiness and discomfort

• Fleas

  • Medical Significance

    • Vectors for bubonic plague bacterium

    • Can transmit other pathogens

• Bugs (Hemipterans like Triatomine bugs)

  • Medical Significance

    • Can transmit Trypanosoma cruzi causing Chagas disease

• Stinging insects (e.g., bees, wasps, hornets)

  • Medical Significance

    • Stings can cause local reactions

    • Severe allergic reactions or anaphylaxis in sensitive individuals