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Archaeocyatha: Quiz


Question 1: The ________ Archaeocyatha have traditionally been divided into Regulares and Irregulares (Rowland, 2001):
Ghost lineageComputational phylogeneticsCladePhylogenetics

Question 2: Their ________ affiliation has been subject to changing interpretations, yet the consensus is growing that the archaeocyath was indeed a kind of sponge, [3] thus sometimes called a pleosponge.
EvolutionPhylogeneticsCladeComputational phylogenetics

Question 3: Almost all species became ________ by the Middle Cambrian, with the final-known species disappearing just prior to the end of the Cambrian period, Antarcticocyathus webberi.
ExtinctionConservation biologyHolocene extinctionEvolution

Question 4: [4] However, one cladistic analysis[5] suggests that Archaeocyatha is a clade nested within the phylum ________ (better known as the true sponges).

Question 5: It is believed that the centre of the Archaeocyatha origin is in East ________, where they are first known from the beginning of the Tommotian Age of the Cambrian, more than 535 million years ago (mya).
Ural MountainsRussiaNorth AsiaSiberia

Question 6: Today, the archaeocyathan families are recognizable by small but consistent differences in their ________ structures: Some archaeocyathans were built like nested bowls, while others were as long as 30 cm.
PaleontologyFossilGeologic time scaleGeology

Question 7: Their widespread distribution over almost the entire Cambrian world, as well as the taxonomic diversity of the species, might be explained by surmising that that they were ________ during their larval stage.
Primary productionZooplanktonPhytoplanktonPlankton

Question 8: But some invertebrate ________ have placed them in an extinct, separate phylum, known appropriately as the Archaeocyatha.
PaleontologyGeologic time scaleEcologyEvolution

Question 9: The Archaeocyatha or archaeocyathids ("ancient cups") were sessile, reef-building[1] marine organisms of warm tropical and subtropical waters that lived during the early (lower) ________ period.
CambrianCambrian explosionDevonianGeologic time scale

Question 10: Then, in the beginning of the ________ Age around 516 mya, the archaeocyaths went into a sharp decline.
Geologic time scaleCambrianDevonianCambrian explosion


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