Phylum Arthropoda: Class Arachnida Flashcards

Study Notes

Class: Arachnida

Includes scorpions, whip scorpions, spiders, pseudoscorpions, camel spiders, daddy long legs, and mites.

Order Scorpiones (True Scorpions)

Characterized by pectines, comb-like structures that serve a chemosensory function.

Order Uropygi (Whip Scorpion)

Notable for its long, whip-like tail; details on specific characteristics are less defined here.

Order Araneae (Spiders)

Possess a pedicel, a narrow stalk connecting the prosoma (front body segment) and opisthosoma (rear body segment).
Feature spinnerets, tubular structures that secrete silk for creating webs and cocoons.

Order Pseudoscopionida (Pseudoscorpions)

Extremely small with large pedipalps.
They lack stingers, distinguishing them from true scorpions.

Order Sulpugida (Camel Spiders)

Known as sun spiders or wind scorpions, they are noted for their rapid movements; specific details are not provided.

Order Opiliones (Daddy Long Legs or Harvestmen)

Body structure consists of a fused prosoma and opisthosoma, creating a rounded appearance.

Order Acari (Mites and Ticks)

Capitulum serves as the anterior structure containing mouthparts and pedipalps.
The prosoma and opisthosoma are fused into a single, unified body segment.

Order Acari (Mites and Ticks)

Exhibit a hypostome, a harpoon-like structure that enables them to anchor to hosts.

Class: Pycnogonida (Sea Spiders)

Feature a proboscis, a slender tubular extension that ends in an opening.
Chelicerae are typically reduced or absent.
Males possess ovigerous legs, specialized appendages for carrying eggs.

Description

Explore the fascinating world of Arthropoda, specifically focusing on the Class Arachnida through flashcards. Learn about various orders, including scorpions and whip scorpions, along with their unique characteristics and definitions. This quiz is perfect for students of zoology or anyone interested in arachnids.