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Xiphosura: Quiz


Question 1:
  • Bunodinae Packard 1886 (Upper ________ to Downtonian)
    SilurianDevonianGeologic time scaleOrdovician

Question 2:
  • Tachypleini Pocock, 1902 (________ to Recent)
    LanghianMiocenePlioceneGeologic time scale

Question 3: There are a pair of ________ on the side of the prosoma, and one or two median ocelli towards the front.
EyeBrainNervous systemSensory system

Question 4: The opisthosoma terminates in a long caudal spine, commonly referred to as a telson (though this same term is also used for a different structure in ________).

Question 5: The group has hardly changed in millions of years; the modern horseshoe crabs look almost identical to prehistoric genera such as the ________ Mesolimulus, and are considered to be living fossils.
Geologic time scaleJurassicDinosaurCretaceous

Question 6: Xiphosurans have a well developed circulatory system, with numerous ________ that send blood from the long tubular heart to the body tissues, and then to two longitudinal sinuses next to the gills.
Blood vesselSystemic circulationArteryArterial tree

Question 7: The excretory system consists of two pairs of coxal glands connected to a ________ that opens near the base of the last pair of walking legs.
UreterUrinary systemUrinary bladderKidney

Question 8: After grinding up its food in the gizzard, the animal regurgitates any inedible portions, and passes the remainder to the true ________.
StomachVermiform appendixSmall intestineColon (anatomy)

Question 9: The eggs are about 2 to 3 millimetres (0.079 to 0.12 in) across, and hatch into a larva that superficially resembles a ________.
ArthropodTrilobiteOrdovicianCambrian explosion

Question 10:
  • Weinberginidae Richter and Richter, 1929 (Lower ________)
    Geologic time scaleCarboniferousLate Devonian extinctionDevonian


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