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Questions and Answers
Which of these features is NOT found in members of the Subphylum Chelicerata?
Which of these features is NOT found in members of the Subphylum Chelicerata?
Which class of Chelicerates includes creatures with 10 eyes and 6 pairs of appendages?
Which class of Chelicerates includes creatures with 10 eyes and 6 pairs of appendages?
What is the primary function of the pedipalps in chelicerates?
What is the primary function of the pedipalps in chelicerates?
Which of the following is a characteristic shared by both Myriapods and Chelicerates?
Which of the following is a characteristic shared by both Myriapods and Chelicerates?
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What is the primary difference between the circulatory systems of humans and arthropods?
What is the primary difference between the circulatory systems of humans and arthropods?
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Which of the following statements about the growth of arthropods is TRUE?
Which of the following statements about the growth of arthropods is TRUE?
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Which of the following is NOT a characteristic of members of the Class Pycnogonida, also known as sea spiders?
Which of the following is NOT a characteristic of members of the Class Pycnogonida, also known as sea spiders?
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What is the primary function of the chelicerae in chelicerates?
What is the primary function of the chelicerae in chelicerates?
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Which of the following classes within the Myriapoda subphylum is characterized by a dorso-ventrally flattened body and the presence of stinging fangs on the first pair of trunk appendages?
Which of the following classes within the Myriapoda subphylum is characterized by a dorso-ventrally flattened body and the presence of stinging fangs on the first pair of trunk appendages?
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Which of the following myriapod classes possesses branched antennae and exhibits an increase in the number of legs with each molt, starting with only three pairs in the first instar?
Which of the following myriapod classes possesses branched antennae and exhibits an increase in the number of legs with each molt, starting with only three pairs in the first instar?
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In which myriapod class is a fusion of two segments observed along the body, with the exception of the first trunk segment, leading to the presence of two pairs of appendages on each segment?
In which myriapod class is a fusion of two segments observed along the body, with the exception of the first trunk segment, leading to the presence of two pairs of appendages on each segment?
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Which of the following myriapod classes are known for being small, translucent, fast-running invertebrates that often reside in soil and forest litter environments?
Which of the following myriapod classes are known for being small, translucent, fast-running invertebrates that often reside in soil and forest litter environments?
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Among the myriapod classes, which one lacks eyes and features elongated, segmented antennae?
Among the myriapod classes, which one lacks eyes and features elongated, segmented antennae?
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Which of the following myriapod classes contains members that are cylindrical in shape, often lack eyes, and have a head with one pair of maxillae?
Which of the following myriapod classes contains members that are cylindrical in shape, often lack eyes, and have a head with one pair of maxillae?
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Which of the following myriapod classes includes members that are terrestrial soil dwellers and have a soft, cylindrical body with an increasing number of legs as they molt?
Which of the following myriapod classes includes members that are terrestrial soil dwellers and have a soft, cylindrical body with an increasing number of legs as they molt?
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Which myriapod class is known for having a body divided into a head and trunk, with the trunk possessing 25-100 or more segments?
Which myriapod class is known for having a body divided into a head and trunk, with the trunk possessing 25-100 or more segments?
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Study Notes
Medical Entomology
- Medical entomology is the study of arthropods of medical importance.
- Entomology is the scientific study of insects.
- Arthropods are invertebrate animals with jointed legs.
General Characteristics of Arthropods
- Arthropods have jointed legs, called appendages.
- Their bodies are covered in an exoskeleton made of chitin.
- They grow by molting.
- Their bodies are bilaterally symmetrical and segmented.
- They have a body cavity between the alimentary canal and the body wall.
- Arthropods have an open circulatory system, unlike the closed system seen in vertebrates.
- They have a ventral, ladder-like nervous system.
Classification of Arthropoda - Subphylum Chelicerata
- Chelicerates are mostly terrestrial arthropods (except sea spiders and horseshoe crabs).
- They lack antennae.
- They have chelicerae, clawed appendages used for grabbing and shredding food.
- Chelicerata is further divided into three classes: Arachnida, Pycnogonida, and Meristomata.
Class Arachnida
- Contains approximately 65,000 described species.
- Includes spiders, scorpions, and mites which are terrestrial.
- Lack antennae and wings.
- Divided into two body regions: cephalothorax and abdomen.
- 6 pairs of appendages: 4 pairs for walking and 2 pairs of mouthparts (chelicerae and pedipalps).
Class Meristomata
- Primarily marine aquatic arthropods.
- Includes extinct sea horse and extant horseshoe crabs.
- Prosoma (head region) bears 10 eyes and 6 pairs of appendages.
- One pair are chelicerae.
- Five pairs are walking legs.
Class Pycnogonida
- Contains over 1,300 species, known as sea spiders.
- Marine arthropods.
- Characterized by a small body and long legs.
- Body divided into cephalothorax and abdomen.
- Abdomen lacks appendages.
- Four pairs of walking legs; some may have additional appendages.
- Have chelicerae to grasp prey; and appendages for sensory and reproductive functions.
Subphylum Myriapoda
- Myriapods (e.g., centipedes and millipedes) are terrestrial arthropods.
- Over 13,000 species.
- Elongated and worm-like bodies.
- A single pair of antennae.
- Multiple jointed legs (10-200+ pairs).
- Myriapoda is further divided into four classes: Chilopoda, Diplopoda, Pauropoda, and Symphyla.
Class Chilopoda (Centipedes)
- Dorso-ventrally flattened.
- Body subdivided into head and trunk.
- Head bears antennae and three pairs of mouthparts.
- Two pairs of simple eyes.
- First trunk appendages modified into strong fangs for prey capture and defense.
- Each trunk segment has one pair of legs.
Class Diplopoda (Millipedes)
- Cylindrical body with head and trunk.
- Head with antennae and mandibles, and one pair of maxillae.
- Each trunk segment (25-100+) bears two pairs of legs.
- Segments fuse except for the first segment.
- May have simple eyes or lack eyes entirely.
Class Pauropoda
- Terrestrial, soil-dwelling arthropods.
- Soft and cylindrical bodies.
- First instar with three pairs of legs; additional legs added with each molt.
- Lack eyes
- Antennae are branched.
Class Symphyla (Garden Centipedes)
- Terrestrial, soil-dwelling arthropods.
- Small, blind, fast-moving myriapods, often abundant in soil and forest litter.
- Translucent, lack body pigment, and are 2-9 mm long.
- Delicate, white, and soft-bodied.
- Body divided into head and trunk.
- Juveniles with 6 pairs of legs, adding a pair with each molt.
- Lack eyes
- Long, segmented antennae.
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Description
Test your knowledge on medical entomology and the characteristics of arthropods. Explore the classification of the subphylum Chelicerata and learn about the unique features of these fascinating creatures. This quiz will help reinforce your understanding of arthropods and their importance in medicine.
