Podcast
Questions and Answers
Which of the following are parts of a scorpion's prosoma?
Which of the following are parts of a scorpion's prosoma?
Scorpions have three pairs of lateral eyes.
Scorpions have three pairs of lateral eyes.
False
What do scorpions primarily feed on?
What do scorpions primarily feed on?
Crickets, bugs, and other small rodents and lizards.
A scorpion's last metasomal segment bears the anus and a stinging apparatus called the __________.
A scorpion's last metasomal segment bears the anus and a stinging apparatus called the __________.
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Match the following features of scorpions with their descriptions:
Match the following features of scorpions with their descriptions:
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What are the two main body regions of a spider?
What are the two main body regions of a spider?
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Spiders have six legs attached to their thorax.
Spiders have six legs attached to their thorax.
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Name the structures through which spiders breathe.
Name the structures through which spiders breathe.
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The __________ are the silk-spinning organs found on the abdomen of a spider.
The __________ are the silk-spinning organs found on the abdomen of a spider.
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Which of the following is NOT a sub-phylum of Phylum Arthropoda?
Which of the following is NOT a sub-phylum of Phylum Arthropoda?
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Match the following scorpion body regions with their descriptions:
Match the following scorpion body regions with their descriptions:
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All arachnids are herbivores.
All arachnids are herbivores.
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What is the body division of Chelicerata called?
What is the body division of Chelicerata called?
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Which of the following structures helps spiders with food handling?
Which of the following structures helps spiders with food handling?
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Arachnids primarily use _____ for excretion.
Arachnids primarily use _____ for excretion.
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Scorpions are primarily herbivores.
Scorpions are primarily herbivores.
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Match the following classes of Chelicerata with their examples:
Match the following classes of Chelicerata with their examples:
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What is the function of spinnerets in spiders?
What is the function of spinnerets in spiders?
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Which characteristic is unique to the Sub-Phylum Chelicerata?
Which characteristic is unique to the Sub-Phylum Chelicerata?
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All arachnids have complex eyes.
All arachnids have complex eyes.
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What is the primary method of feeding for arachnids?
What is the primary method of feeding for arachnids?
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Study Notes
Phylum Arthropods
- Arthropods are a diverse group of animals characterized by a segmented body, jointed appendages, and a hard exoskeleton.
- The images illustrate various arthropod types, showcasing their diverse forms and structures.
- Arthropods are classified into various subphyla, including Trilobitomorpha (extinct), Chelicerata, Myriapoda, Crustacea, and Hexapoda.
Classification of Phylum Arthropoda
- Subphylum Chelicerata:
- Body divided into two regions: prosoma (cephalothorax) and opisthosoma (abdomen).
- Lack jaws
- Have six appendages
- Four pairs of walking legs
- Includes Arachnida (spiders, ticks, scorpions)
- Subphylum Crustacea:
- Includes various crustaceans like crabs, shrimps, lobsters.
- Subphylum Hexapoda:
- Includes insects.
- Subphylum Myriapoda
- Includes centipedes and millipedes.
Subphylum Chelicerata Details
- Cephalothorax(prosoma): fused head and thorax
- Opisthosoma(abdomen): contains essential organs like digestive, excretory and respiratory
- Sensory, feeding, and locomotion
- Have six appendages
- Lack antennae
- Usually have eyes.
- Most suck liquid food from prey
- Appendages attached to cephalothorax:
- Pair of chelicerae (pincer-like feeding appendages)
- Pair of pedipalps (usually sensory or feeding)
- Four pairs of legs
Class Arachnida
- All arachnids are carnivores, primarily feeding on insects.
- Lack antennae
- Usually have eight simple eyes.
- Use coxal glands and/or Malpighian tubules for excretory functions.
- Possess book lungs for respiration
- Have air intake tubes called trachea, opening through spiracles.
- Dioecious (separate sexes)
Spider Body Parts
- Unlike insects, spiders have two body sections: cephalothorax and abdomen.
- Cephalothorax: fused head and thorax, covered by a hard carapace.
- Simple eyes (usually eight), mouthparts (chelicerae, pedipalps), four pairs of segmented legs.
- Abdomen: contains internal organs like the digestive system, reproductive organs, and respiratory structures(book lungs).
- Spinnerets (silk spinning organs): located on the abdomen, used to produce silk for webs and cocoons.
The Abdomen
- Organ protection:Book lungs, delicate internal organs are protected by covers on the outside of the abdomen.
- Genital opening and sperm or egg release.
- Silk glands: produce fluid protein for silk production.
- Reproductive organs (ovary or testes).
Spinnerets
- Spinnerets are tubular or conical structures.
- Silk is produced in liquid form, and turns to filament when exposed to air.
- Silk is drawn into threads, used for webs and cocoons.
Scorpion Anatomy and Characteristics
- The scorpion body has three sections: prosoma, mesosoma, and metasoma.
- The prosoma has a shell.
- The mesosoma has six segments. The second segment has pectines and the first segment has the genital operculum. The third segment onwards have the stigmata, leading to the book lungs.
- The metasoma has six segments with an anus. The last segment bears the stinging apparatus (telson)
- Scorpions are venomous arthropods.
- They have a segmented body and predaceous carnivores.
- They often hide during the day.
- They feed primarily on insects, spiders, etc.
Scorpion Protection and Feeding
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Scorpions have a venomous sting in their telson(tail).
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Their pincers are used to grasp prey and paralyze them with venom.
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Scorpions are aggressive, and their venom can be lethal to humans.
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Scorpions can camouflage themselves in their habitat.
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They feed mainly on crickets, bugs, and small rodents/lizards.
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Insect vs Spider:
- Insects have three body sections (head, thorax, abdomen) and six legs.
- Spiders have two body sections (cephalothorax, abdomen) and eight legs.
- Spiders do not have wings as Insects do.
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Description
This quiz explores the classification and characteristics of phylum Arthropoda. Learn about the diverse subphyla, including Chelicerata, Crustacea, Myriapoda, and Hexapoda. Examine their unique anatomical features and discover the wide variety of arthropods present in nature.
