Examkin

Question

Difficulty: EasyHigher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

An organism collected during a biology field trip possesses three distinct body regions (head, thorax, and abdomen), one pair of antennae, and three pairs of jointed legs. Which class of arthropods does this organism belong to?

  1. InsectaAnswer
  2. B
    Arachnida
  3. C
    Crustacea
  4. D
    Myriapoda

Answer

Insecta
The class Insecta is defined by a body divided into three distinct regions (head, thorax, and abdomen), one pair of sensory antennae, and three pairs of jointed thoracic legs.

Step-by-Step Solution

1
Analyze the morphological traits given in the scenario.
Identified three body tagmata (head, thorax, abdomen), one pair of antennae, and three pairs of jointed legs.
These specific anatomical features serve as key diagnostic indicators for classifying arthropod sub-groups.
2
Match these anatomical traits to the corresponding class of Arthropoda.
The combination of three body divisions and three pairs of walking legs defines the class Insecta (hexapods).
Members of Insecta uniquely possess six jointed legs attached to the thoracic region and a single pair of antennae.

Key Concept

Structural characteristics and classification of Arthropoda classes
Estimated Time:45s
Rate this question

Topics

Higher Invertebrates: Annelida, Mollusca, Arthropoda, and Echinodermata

More questions from this topic