Arthropoda

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This is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and jointed appendages.

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Arthropod

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Term used to describe a "three-lobed" (three longitudinal lobes) fossil group which is now extinct.

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Trilobita

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A sub-phylum of Arthropods that include horseshoe crabs, scorpions, spiders, and mites.

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Chelicerata

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These are marine Arthropods known as sea spiders in the sub-phylum Chelicerata.

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Pycnogonida

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This is a class of joint-legged invertebrate animals in the sub-phylum Chelicerata which have eight legs and known as spiders.

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Arachnida

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A marine class of the sub-phylum Chelicerata which includes horseshoe crabs and eurypterids and are the only Chelicerata to have a compound eye.

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Merostomata

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A very large group of Arthropods which includes crabs, lobsters, crayfish, shrimp, krill, and barnacles.

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Crustaceans

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An order of crustaceans meaning "ten footed"

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Decapoda

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The hard, horseshoe-shaped shell of a horseshoe crab

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Carapace

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Types of eyes on a horseshoe crab and where they are located.

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Compound eye (2) - located on dorsal side near middle. Simple eye (2) - located on dorsal side near front.

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On the horseshoe crab, this body part bears six pairs of spines along the side as well as six pairs of appendages on the ventral side. Where is it located?

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Abdomen - located at the rear of the crab; large area.

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The second pair of antennae and where they are located on a crayfish. Used for touch, taste, and equilibrium.

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Antennules - located inner of the antennae.

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These extend from the head of a crayfish, long. Used for touch and taste.

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Antenna

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On a crayfish, these come from the rostrum and are stalked.

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Eyes

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The hard covering on a crayfish that covers the cephalothorax. Where it is located?

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Carapace - located front of the body where the head is.

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The last part of the abdomen in a crayfish which bears the anus; the last division of the body. Used for steering and swimming.

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Telson

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The difference between male and female in a horseshoe crab.

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Male has boxing-like claws in the front while the female has only claws. Female is also larger in general.

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The very end of the crayfish comprised of a pair. Used for swimming and egg protection.

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Uropod

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The difference between a male and female crayfish.

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The first swimmeret is reduced or absent in a female. In males, it it full sized, used for the transformation of sperm to the female. In a female, a seminal receptacle is visible as well as the opening of the oviducts.

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In the crayfish, these are used to direct food into the mouth and hold it. A palp is connected to it.

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Mandible

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In crayfish, these are used to direct food into the mouth as well as touch and taste. The third set contains gills.

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Maxilliped

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In crayfish, there are two of these used for food handling as well as the bailing of water from the gill chamber.

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Maxilla

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In crayfish, this is used for grasping food as well as for offense/defense. These are the largest claws.

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Cheliped

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These are used for walking in the crayfish.

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Walking legs

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In crayfish, this large organ lies in the head region, anterior to the heart.

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Stomach

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These glands in the crayfish are located in the head region and are round and cushion-shaped.

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Antennal glands (AKA green glands)

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In crayfish, this rather large gland furnishes digestive secretions. It is located under the stomach.

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Digestive gland

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In crayfish, this organ is located on the back in the pericardial sinus. Has four holes called ostia.

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Heart

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In crayfish, these lie just under the heart. they are very slender organs, usually slightly different in color.

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Gonads

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In crayfish, this muscle is located in the abdomen which flex the abdomen.

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Flexor muscle

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In crayfish, this extends from the stomach all the way to the anus, used for the removal of waste.

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Intestine

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In crayfish, these are located at the head and attach the stomach to the carapace.

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Gastric muscle

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What is the antennal gland used for?

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IDK!