How to use Sea-urchins in a sentence

sea-urchins
  • Klein (1734) to denote the tests of the Echini or sea-urchins; its later use for the animals themselves, or for the whole phylum, was an error in both history and etymology.

    1
    0
  • Those plates are perhaps constant throughout sea-urchins and starfish (though it would puzzle any one to detect them in certain Silurian echinoids), and they may be traced in some of the fixed echinoderms; but there is no proof that they represent the radials of a simple crinoid, and there are certainly many cystids in which no such plates existed.

    1
    0
  • They do not feed on fish, like true otters, but on clams, mussels, sea-urchins and crabs; and the female brings forth but a single young one at a time, apparently at any season of the year.

    1
    0
  • We are currently investigating crystal growth in a number of natural systems including coccoliths and sea urchins.

    1
    0
  • Other fossils include the sea urchins (echinoids ), which occur in a number of varieties.

    1
    0
    Advertisement
  • Lime is, in fact, absorbed to an enormous extent by fishes, molluscs, crustacea, calcareous algae and sponges, starfishes, sea-urchins and feather stars, many polyzoa and a multitude of protozoa (mainly the foraminifera).

    0
    0
  • The Tornaria larva offers a certain similarity to larvae of Echinoderms (sea-urchins, star-fishes, and sea-cucumbers), and when first discovered was so described.

    0
    0
  • North of the Atlas it belongs to the European type, in the south it contains a fauna of oysters and sea-urchins belonging to the facies " africano-syrian " of Zittel.

    0
    0
  • Corals, both reef-builders and others, flourished in the clearer waters; rugose forms are represented by Amplexoid, Zaphrentid and Cyathophyllid types, and by Lithostrotion and Phillipsastraea; common tabulate forms are Chaetetes, Chladochonus, Michelinia, &c. Amongst the echinoderms crinoids were the most numerous individually, dense submarine thickets of the long-stemmed kinds appear to have flourished in many places where their remains consolidated into thick beds of rock; prominent genera are Cyathocrinus, Woodocrinus, Actinocrinus; sea-urchins, Archaeocidaris, Palaeechinus, &c., were present; while the curious extinct Blastoids, which included the groups of Pentremitidae and Codasteridae, attained their maximum development.

    0
    0
  • There was also sufficient comprehension of the differences between the main classes of Echinoderms - the sea-urchins or Echinoidea, the starfish or Asteroidea, the brittle-stars and their allies known as Ophiuroidea, the worm-like Holothurians, the feather-stars and sea-lilies called Crinoidea, with their extinct relatives the sac-like Cystidea, the bud-formed Blastoidea, and the flattened Edrioasteroideawhile within the larger of these classes, such as Echinoidea and Crinoidea, fair working classifications had been established.

    0
    0
    Advertisement
  • In other parts the rocks were totally bare from having been grazed by massive numbers of spiny sea urchins.

    0
    0
  • Underwater you'll find plenty of anemones, Ross corals and edible sea urchins.

    0
    0
  • Marine life is made up of crustaceans, echinoderms, spiny black sea urchins and a resident school of spotted sweetlips.

    0
    0
  • In coastal areas there can also be painful results from standing on sea urchins or contact with the spines of certain fish.

    0
    0
  • Crinoids are sometimes called sea lilies, but are in fact creatures related to starfish and sea urchins.

    0
    0
    Advertisement
  • Other fossils include the sea urchins (echinoids), which occur in a number of varieties.

    0
    0
  • Sometimes sea urchins may be occupying your seashell find.

    0
    0
  • For example, when studying sea creatures it will be more interesting to visit a marine museum and science center to play in a touch-tank than to see pictures of starfish, sea urchins and hermit crabs.

    0
    0