Science / Biology 122 Midterm Study Guide

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Can you name the phyla, classes, and orders on the Biology 122 midterm?

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CharacteristicsPhylum, Class, or OrderCommon name or example
 Hagfishes
All marine, medusa is dominant body form, four tentaclesBox jellies, sea wasps
Body chiefly cephalothorax, 4-6 pairs of long, walking legs, mouth on long proboscis, no respiratory or excretory systemSea spiders
Mostly terrestrial, one pair of appendages per segment, most appendages uniramous, malphighian tubules
Eight thoracic segments, six abdominal segments, telson
Notochord, dorsal nerve cord, pharyngeal slits, endostyle, muscular, postanal tail
Some use pharyngial slits as respiratory organs, some use as modified jawsVertebrates
Five cephalic, six thoracic, four abdominal segments, telson, no abdominal appendagesBarnacles, copepods
Largest class of molluscs, terrestrial, marine, freshwater, veliger larva, torsion and coilingSnails, slugs
All marine and free-living, medusa is dominant body formTrue jellyfish, Aurelia
Bony skeleton, most tetrapod, most biphasic and undergo metamorphosis, fertilization in waterFrogs, salamanders
Head absent, conspicuous segmentation, no parapodia, few setae per segment, no larvae, terrestrial and freshwater, monoeciousEarthworms
Carnivorous, anterior poison jawsCentipedes
 Lampreys
Can self-eject vescera (autoeviscerate), respiratory treeSea cucumbers
Syncytial tegument, scolex with suckers and hooks, body divided into proglottids, no digestive organs, usually two or more hosts, usually monoeciousTapeworms
Distinct head, conspicuous segmentation, segments with parapodia and many setae, usually trochophore larvae, mostly marine, dioeciousLugworm, sandworm, clam worm
Body divided into three longitudinal lobes, distinct head, trunk, and abdomen, biramous appendages, all extinct
Lobe-finned teleost (Bony fish), Caudal fin diphycercal, southern hemisphere
Segmentation, triploblastic, eucoelomate, septum, parapodia, setae, metanephridia
Cephalothorax and abdomen, appendages with gills, sharp telsonHorseshoe crabs
CharacteristicsPhylum, Class, or OrderCommon name or example
Organ grade of organization, bilateral symmetry, three germ layers
Lose three hallmarks as adult, stationary as adultTunicates (sea squirts)
Four pairs of segmented legs, cephalothorax and abdomen, respiration by gills, tracheae, or book lungs, excretion by Malphighian tubules, no true metamorphosisSpiders, scorpions, ticks, mites
No cephalization, filter feeders, no radula, shell in two halves, muscular foot, labial palpBivalves
Same as annelids, but... Jointed appendages, pronounced tagmatization, lack intersegmental septa, chitinous exoskeleton, open circulatory system, trachiole system, undergo ecdysis
Aquatic, non-tetrapod vertebrate, possess gills, appendages as fins, skin with scales(Not a phylum, class, or order)
Slender, long arms, madreporite on oral surface, no suckers on tube feet, respiration via bursaeBrittle and basket stars
Syconoid or leuconoid canal systems, siliceous spicules having six rays
One host, ectoparasitic, syncytial tegument, ciliated larval forms, monoecious
Leuconoid canal system
Mostly marine, solitary or colonial living, polyp is dominant body formHydra, Portuguese Man-O-War, Obelia
All marine, polyp is only body form, carnivorousSea anemones, corals
Spines radiating from central body, ossicles fused into test, feed through Aristotle's lanternSea urchins
Aquatic, two pairs of antennae, most appendages biramous, most possess carapace, ecdysis
Thick, scaly skin, amniotic egg, jaws for crushing prey, internal fertilization, ectothermicLizards, turtles, snakes
Jaws present, paired appendages
Ray-finned teleost (Bony fish)
Slime glandVelvet worms
Well-developed organ system, eucoelomate, ventral muscular foot, visceral mass, mantle, radula
Phyllopodia, no abdominal appendages
Head absent, conspicuous and fixed number of segments, parapodia and setae absent, no larvae, marine, freshwater, and terrestrial, monoeciousLeeches
CharacteristicsPhylum, Class, or OrderCommon name or example
Stalk, calyx, anchored to substrate as adultSea lillies
Central disc, water-vascular system, crawl on tube feet, dermal endoskeleton, ossicles, can eject stomachSea stars
Closed circulatory system, siphon, beak-like jaws, tentacles, pen, camera eyeSquids, cuttlefish, nautilus, octopuses (That's the what he had on the PowerPoint, I didn't question it.)
Body composed of head, trunk, and foot, ciliated corona, muscular pharynx, or mastax, with jaws, dioecious
Organ system level of organization, bilateral symmetry, triploblastic, pseudocoelomate, cephalization
Tegument without cilia, endoparasites, digenetic, monoeciousFlukes
Six pairs of appendages, no antennae
Cell-tissue grade of complexity, radial symmetry, two germ layers, incomplete guy, mesoglea, cnidocytes
No carapace, dorso-ventrally flattened, gills on abdominal appendagesPill bugs
Deuterostome, link between echinoderms & chordates?, dorsal nerve chord, pharyngeal gill slits
Powerful jaws, predatory, cartilagenous skeleton, oviparous, viviparous, and ovoviviparous, caudal fin, lateral lineSharks, rays, skates
Deuterostomes
Scavengers/herbivoresMillipedes
Three canal types, calcium carbonate spicules which are straight or have 3-4 rays
Live halfway in sediment, as adult have all five hallmarksLancelets
No germ layers, No body symmetry, No coelom, No cephalization, No segmentation, Contain choanocytes, amebocytes, porocytes, pinacocytes, spicules, spongin, and mesohyl
Thoracic segments fused, covered by carapace, compound eyes on stalks, first three pairs of thoracic appendages modified into maxillipedsCrayfish, crabs, lobsters, shrimp
Jawless, no paired appendages, cartilagenous skeleton
All aquatic, cilia on ventral surface, circular, longitudinal, and dorsoventral muscles, mouth/anus digestive system, auricles, ocelli, protonephridiumCiliated flatworms
Head, thorax, abdomen, have four wings, three pairs of walking appendages, most oviparousInsects
Dorsally convex, eight articulating plates, trochophore, usually dioeciousChitons

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