Podcast
Questions and Answers
What is the name of the order that includes spiders, which emerged onto land 400 million years ago?
What is the name of the order that includes spiders, which emerged onto land 400 million years ago?
- Scorpiones
- Opiliones
- Arachnida
- Aranae (correct)
What is the main difference between millipedes and centipedes?
What is the main difference between millipedes and centipedes?
- Habitat
- Number of legs per segment (correct)
- Type of venom
- Shape of the body
Which group of arthropods is characterized by having two pairs of antennae?
Which group of arthropods is characterized by having two pairs of antennae?
- Crustacea (correct)
- Mandibulata
- Hexapoda
- Chelicerata
What is the primary characteristic that distinguishes trilobites from other extinct animals?
What is the primary characteristic that distinguishes trilobites from other extinct animals?
What is the name of the substance produced from horseshoe crab blood that is used to test for endotoxins in intravenous drugs?
What is the name of the substance produced from horseshoe crab blood that is used to test for endotoxins in intravenous drugs?
What is the primary reason why horseshoe crabs are important to medicine?
What is the primary reason why horseshoe crabs are important to medicine?
Which group of arthropods is divided into three parts from head to tail and from side to side?
Which group of arthropods is divided into three parts from head to tail and from side to side?
What is the term used to describe the body plan of subphylum Chelicerata?
What is the term used to describe the body plan of subphylum Chelicerata?
What is the name of the class that includes harvestmen, which have an abdomen and cephalothorax that are broadly joined?
What is the name of the class that includes harvestmen, which have an abdomen and cephalothorax that are broadly joined?
Which group of arthropods is characterized by having a segmented body and jointed legs?
Which group of arthropods is characterized by having a segmented body and jointed legs?
What is the function of book gills/book lungs in subphylum Chelicerata?
What is the function of book gills/book lungs in subphylum Chelicerata?
Why are endotoxins ubiquitous in the environment?
Why are endotoxins ubiquitous in the environment?
What is the name of the subclass that includes barnacles, which are sessile crustaceans with a hardened cuticle?
What is the name of the subclass that includes barnacles, which are sessile crustaceans with a hardened cuticle?
What is the term used to describe animals that have barely changed over millions of years?
What is the term used to describe animals that have barely changed over millions of years?
Which group of arthropods is characterized by having a vermiform body and is the most numerous animal on the planet?
Which group of arthropods is characterized by having a vermiform body and is the most numerous animal on the planet?
What is the name of the clade that refers to the grouping of myriapods alongside Pancrustacea?
What is the name of the clade that refers to the grouping of myriapods alongside Pancrustacea?
What is the purpose of limulus amebocyte lysate (LAL) in medicine?
What is the purpose of limulus amebocyte lysate (LAL) in medicine?
What is the characteristic that distinguishes trilobites from other arthropods?
What is the characteristic that distinguishes trilobites from other arthropods?
What is the significance of horseshoe crabs in the production of vaccines?
What is the significance of horseshoe crabs in the production of vaccines?
Why is it necessary to test for endotoxins in intravenous drugs?
Why is it necessary to test for endotoxins in intravenous drugs?
What is the feature that distinguishes crustaceans from other arthropods?
What is the feature that distinguishes crustaceans from other arthropods?
What is the function of the swathing silk in spiders?
What is the function of the swathing silk in spiders?
What is the characteristic feature of the class Diplopoda?
What is the characteristic feature of the class Diplopoda?
What is the term used to describe the grouping of myriapods alongside Pancrustacea?
What is the term used to describe the grouping of myriapods alongside Pancrustacea?
What is unique about the penis of barnacles?
What is unique about the penis of barnacles?
Which of the following is NOT a characteristic of arthropods?
Which of the following is NOT a characteristic of arthropods?
What is the name of the subclass of crustaceans that includes barnacles?
What is the name of the subclass of crustaceans that includes barnacles?
Which of the following is a characteristic of tardigrades?
Which of the following is a characteristic of tardigrades?
What is the name of the phylum to which spiders belong?
What is the name of the phylum to which spiders belong?
What is the term used to describe the grouping of crustaceans alongside insects?
What is the term used to describe the grouping of crustaceans alongside insects?
What is the primary characteristic of trilobites that distinguishes them from other arthropods?
What is the primary characteristic of trilobites that distinguishes them from other arthropods?
Which of the following arthropod groups is most closely related to the production of limulus amebocyte lysate (LAL)?
Which of the following arthropod groups is most closely related to the production of limulus amebocyte lysate (LAL)?
What is the primary function of book gills/book lungs in subphylum Chelicerata?
What is the primary function of book gills/book lungs in subphylum Chelicerata?
Why are endotoxins a significant concern in medical applications?
Why are endotoxins a significant concern in medical applications?
What is the term used to describe animals that have remained relatively unchanged over millions of years?
What is the term used to describe animals that have remained relatively unchanged over millions of years?
What is the name of the substance produced from horseshoe crab blood that detects bacterial endotoxins?
What is the name of the substance produced from horseshoe crab blood that detects bacterial endotoxins?
What is the characteristic feature of trilobites that is reflected in their name?
What is the characteristic feature of trilobites that is reflected in their name?
Why are horseshoe crabs important to the production of vaccines?
Why are horseshoe crabs important to the production of vaccines?
What is the primary characteristic of subphylum Chelicerata?
What is the primary characteristic of subphylum Chelicerata?
Why are trilobites the most diverse group of extinct animals preserved in the fossil record?
Why are trilobites the most diverse group of extinct animals preserved in the fossil record?
What is the unique feature of the appendages in crustaceans?
What is the unique feature of the appendages in crustaceans?
Which arthropod group has the longest history on land?
Which arthropod group has the longest history on land?
What is the purpose of the silken dragline in spiders?
What is the purpose of the silken dragline in spiders?
Which arthropod group has the most species?
Which arthropod group has the most species?
What is the name of the substance produced from horseshoe crab blood?
What is the name of the substance produced from horseshoe crab blood?
Which arthropod group is characterized by having a vermiform body?
Which arthropod group is characterized by having a vermiform body?
What is the function of the book gills/book lungs in subphylum Chelicerata?
What is the function of the book gills/book lungs in subphylum Chelicerata?
Which arthropod group is characterized by having two tagmata?
Which arthropod group is characterized by having two tagmata?
What is the name of the clade that refers to the grouping of myriapods alongside Pancrustacea?
What is the name of the clade that refers to the grouping of myriapods alongside Pancrustacea?
What is unique about the legs of barnacles?
What is unique about the legs of barnacles?
What is the characteristic feature of the class Arachnida?
What is the characteristic feature of the class Arachnida?
What is the purpose of the dragline in spider silk?
What is the purpose of the dragline in spider silk?
Which group of arthropods is characterized by having a pair of mandibles and two pairs of maxillae on the head?
Which group of arthropods is characterized by having a pair of mandibles and two pairs of maxillae on the head?
What is the characteristic feature of the class Chilopoda?
What is the characteristic feature of the class Chilopoda?
Which group of arthropods is characterized by having a vermiform body and being the most numerous animal on the planet?
Which group of arthropods is characterized by having a vermiform body and being the most numerous animal on the planet?
What is the function of the cirri in barnacles?
What is the function of the cirri in barnacles?
What is the characteristic feature of the class Malacostraca?
What is the characteristic feature of the class Malacostraca?
What is the purpose of the swathing silk in spiders?
What is the purpose of the swathing silk in spiders?
Which group of arthropods is characterized by having a body divided into three tagmata?
Which group of arthropods is characterized by having a body divided into three tagmata?
What is the characteristic feature of the class Opiliones?
What is the characteristic feature of the class Opiliones?
Flashcards are hidden until you start studying
Study Notes
Arthropods
- Arthropods are the most species animal group on the planet, divided into extant trilobites, chelicerates, and mandibulates.
- Trilobites are the most diverse group of extinct animals preserved in the fossil record, with three parts from head to tail and side to side.
Subphylum Chelicerata
- Chelicerates have a two-tagmata body plan, breathe using book gills/book lungs, and are 300 million years old.
- Arachnida, Pycnogonida, and Merostoma are part of the subphylum Chelicerata.
- Horseshoe crabs are often called "living fossils" due to their minimal changes over millions of years.
- Horseshoe crab blood is used to produce limulus amebocyte lysate (LAL), which detects bacterial endotoxins in intravenous drugs.
Class Arachnida
- Arachnida have two tagmata: cephalothorax and abdomen, with four pairs of walking legs.
- Spiders (order Aranae) emerged onto land 400 million years ago in the Devonian period.
- Spiders excrete silk through spinnerets, which is used for prey wrapping, webs, and ballooning.
- Other arachnids include scorpions, harvestmen, and mites and ticks.
Clade Mandibulata
- Mandibulata refers to the grouping of myriapods alongside Pancrustacea.
- Myriapoda includes centipedes (class Chilopoda) and millipedes (class Diplopoda).
- Centipedes have one pair of legs per segment, are dorsoventrally flattened, and are predators.
- Millipedes have two pairs of legs per segment, have a more cylindrical body, and are often overlooked.
Subphylum Crustacea
- Crustacea is divided into five classes, but current molecular phylogenies do not support the monophyly of all classes.
- Crustaceans are the only arthropods with two pairs of antennae, a pair of mandibles, and two pairs of maxillae on the head.
- Each body segment usually has one pair of appendages, which are biramous.
- Examples of crustaceans include barnacles (class Maxillopoda, subclass Cirripedia) and woodlice (order Isopoda).
Sub-phylum Hexapoda
- Hexapoda has six legs arranged in three pairs with one pair per thoracic segment, with a body divided into three tagmata.
- Hexapoda includes insects, which were previously thought to be closely related to myriapods, but are now placed with crustaceans (Pancrustacea).
Other Arthropods
- Nematodes are the most numerous animals on the planet, with diverse body forms including vermiform.
- Corset worms can survive in total absence of oxygen.
- Tardigrades and velvet worms are members of the Panarthropoda, with extraordinary powers of survival.
- Tardigrades are microscopic water animals with a desiccated tun, and velvet worms are covered in tubercles that give a velvety appearance.
Studying That Suits You
Use AI to generate personalized quizzes and flashcards to suit your learning preferences.
