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WCHC Zoology Chapter 14

Copepodsny one of many groups of animals belonging to the phylum Arthropoda
Arthropods the phylum of animals whose members possess metamerism with tagmatization, a jointed exoskeleton, and a ventral nervous system, includes insects, crustasceans, spiders, and related animals.
exoskeleton an external, jointed skeleton
tagmatization the specialization of body regions of a metameric animal for specific functions, the head of an arthropod is specialized for feeding and sensory functions
epidermal layer sometimes called the Hypodermis because it is covered on the outside by an exoskeleton, and not directly exposed to air or water
epicuticle outermost layer of the exoskeleton, made of waxy lipoprotein
Chitin a tough leathery polysaccharide, and several kinds of proteins
ecdysis Molting process, 4 stages 1)enzymes, secreated from hypodermal glands 2)new procuticle and epicuticle are secreted 3) the old exoskeleton splits open 4)finally, calcium carbonate deposits and hardens the new exoskeleton
hemocoel large tissue space within an arthropod that contains blood, derived rom the blastocoel of the embryo
metamorphosis a radical change in body form and physiology as an immature stage, usually called a larva, becomes an adult
biramous appendages triolobite appendages consisted of two lobes or rami; inner lobe is a walking leg outer lobe bore spikes or teeth, that were used in digging or swimming
prosma or cephalothorax, is a sensory, feeding and locomotor tagma, usually bears eyes, and has no antennae
chelicerae first pair, often pincerlike or chelate, and are most often used in feeding
pedipalps second pair, usually sensory but may also be used in feeding, locomotion or reproduction; paired walking legs follow the pedipalps
opisthosoma posterior to the prosoma, contains digestive, reproductive, excretory, and respiratory organs
limulus polyphenmus widely distributed in the Atlantic ocean and the Gulf of Mexico
genital opercula first pair of opisthosomal appendages cover genital pores on the horseshoe crab
book gills five remaining pairs of appendages; derived from the resemblance of these platelke gills to the pages of a closed book
preadaptation oocurs when a structure present in members of a species proves useful in promoting reproductive success when an individual encounters new environmental situations.
coxal glands paired, thin-walled, spherical bathed in blood of body sinuses, empties through a pore near the proximal joint of the leg
malpighian tubules the blind-ending excretory and osmoregulatory tubles that join the midgut of insects and some othe arthropods. Secrete waste products and form urine
book lungs modification of the arthropod exoskeleton into a series of internal plates that provide surfaces for gas exchange between the blood and air, found in spiders
tracheae the small tubes that carry air from spiracles throught the body cavity of an arthropod, arthropod tracheae are modifications of the exoskeleton
spiracles an opeining for ventilation, the opening of the tracheal system of an arthoropod or an opening posterior to the eye of a shark, skate, or ray
sensilla modifications of the arthropod exoskeleton that, along with nerve cells, form sensory receptors
oviparous organisms that lay eggs that develop outside the body of the female
ovoviviparous organisms with eggs that develop within the female reproductive tract and that are nourished by food stored in the egg
viviparous organisms with eggs that develop within the female reproductive tract and are nourished by the female
protopodite the basal segment of biramous appendage of a crustacean
endopodite the medial ramus of the biramous appendages of crustaceans and trilobites
mandibles the lower jaw of vertebrates; the paired, grinding oand tearing arthropod mouthparts, derived from anterior head appendages
maxillae one member of a pair of mouthparts just posterior to the mandibles of many arthropods
serially homologous metameric structures that have evolved from a common form, the biramous appendages of crustaceans are serially homologous
Created by: dmoudy