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Bio 106 Class Malacostraca structure/function
Bio 106 Class Malacostraca structure/function
34
Zoology
Undergraduate 2
11/05/2017

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Term
Subphylum
Class
Genus
Definition
Crustacea
Malacostraca (Crayfish, lobsters, crabs, shrimp, isopods)
Cambarus
Term
Malacostraca Outside Body Structure
Definition
Two pairs of antennae
Biramous appendages
One pair of mandibles
Two pairs of maxillae
Marine, freshwater, terrestrial
Term
OUTSIDE BODY
Rostrum
Definition
Pointed region between eyes
Term
OUTSIDE BODY
Compound Eyes
Definition
Detects light
Forms visual images
Term
OUTSIDE BODY
Antennae
Definition
Longer modified paired appendages for chemosensory and tactile reception
True antennae
Term
OUTSIDE BODY
Antennules
Definition
Shorter modified paired appendages for chemosensory, tactile, and equilibrium (crayfish) reception
Term
OUTSIDE BODY
Maxillae
Definition
Two sets of short paired appendages near ventral mouth
Holds food while eating
Term
OUTSIDE BODY
Maxillipeds
Definition
Three sets of paired appendages near ventral mouth
Holds and manipulates food
Term
OUTSIDE BODY
Mandibles
Definition
Hard, chitinous mouthparts
Grinds food into mouth
Term
OUTSIDE BODY
Mouth
Definition
Ventral opening to digestive tract
Term
OUTSIDE BODY
Chelipeds
Definition
Large pinchers
Grasping food and defense
Term
OUTSIDE BODY
Walking Legs (periopods)
Definition
Locomotion (land and stream bottom)
Term
OUTSIDE BODY
Swimmerets (pleopods)
Definition
Locomotion (swimming)
Abdominal appendages
Biramous
Term
OUTSIDE BODY
Copulatory Swimmerets (male)
Definition
First two pairs
Larger, club-shaped
Transfers sperm during copulation from male to female
Sperm duct (between the fifth pair of walking legs)
Term
OUTSIDE BODY
Uropod and Telson (tail)
Definition
Pair of broad, fan shaped posterior end
Rapid movement
Directional control during leisurely locomotion
Tail fan (swimming backwards)
Term
OUTSIDE BODY
Anus
Definition
Terminal point of digestive system
Ventral surface of telson
Term
OUTSIDE BODY
Cephalothorax
Definition
Contains walking legs, maxillipeds, carapace, and chelipeds
Anterior end
Term
OUTSIDE BODY
Copulatory Swimmerets (female)
Definition
First two pairs
Long hair-like setae on edges of swimmerets
Attaches eggs there and are brooded until they hatch
Seminal receptacle (between the fifth pair of walking legs)
Term
OUTSIDE BODY
Carapace
Definition
Dorsal exoskeleton in cephalothorax
Term
INSIDE BODY
Gills
Definition
Respiration
Term
INSIDE BODY
Esophagus
Definition
Passageway from mouth to cardiac portion of stomach
Term
INSIDE BODY
Cardiac Chamber of Stomach
Definition
Thick-walled anterior portion of stomach
Contains gastric mill
Term
INSIDE BODY
Pyloric Chamber of Stomach
Definition
Thin-walled chamber
Chemical digestion of food
Term
INSIDE BODY
Digestive glands
Definition
Secrete enzymes into pyloric stomach to facilitate chemical breakdown of food
Term
INSIDE BODY
Intestine
Definition
Nutrients are absorbed into bloodstream
Delivers to body tissues
Term
INSIDE BODY
Heart
Definition
Pumps blood to body tissues through arteries
Ostia allows blood into heart
Term
INSIDE BODY
Dorsal Abdominal Artery
Definition
Longitudinal blood vessel
Distributes blood to the dorsal aspect of the abdomen
Term
INSIDE BODY
Green Glands
Definition
Paired excretory glands
Released through nephropores
Term
INSIDE BODY
Testes
Definition
Sperm production
Vas Deferens from testes to sperm duct
Term
INSIDE BODY
Ovaries
Definition
Egg production
Term
INSIDE BODY
Brain
Definition
Dorsal to the green glands
Houses majority of neural ganglia
Term
INSIDE BODY
Circumesophageal Nerves
Definition
Branches of the ventral nerve cord
Encircles esophagus before merging with the ventral surface, posterior to the esophagus
Term
INSIDE BODY
Ventral Nerve Cord
Definition
Long, white "cord", ventral surface of body
Contains large swellings of ganglia
Handles the majority of coordination w/o brain
Term
INSIDE BODY
Gastric Mill
Definition
In cardiac portion of stomach
Chitinous teeth that grind food into liquefied mush
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