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Systematics, phylogeny and biogeography of the genus Mellita (Echinoidea: Clypeasteroida)
The genus Mellita is an assemblage of New World tropical to temperate lunulate sand dollars (Mellitidae). Multivariate analysis of morphometric data, representing specimens from Nantucket to Brazil,Expand
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A NEW MODEL OF PODIAL DEPOSIT FEEDING IN THE SAND DOLLAR, MELLITA QUINQUJESPERFORATA (LESKE): THE SIEVE HYPOTHESIS CHALLENGED.
The feeding mechanism of Mellita quinquiesperforata (Leske) has been examined in detail. This sand dollar is a deposit feeder, ingesting particles mostly in the range of 100-250 µm. The particles areExpand
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MORPHOLOGY AND CLASSIFICATION OF DECAPOD CRUSTACEAN LARVAL SETAE : A SCANNING ELECTRON MICROSCOPE STUDY OF DISSODACTYLUS CRINITICHELIS MOREIRA , 1901 ( BRACHYURA : PINNOTHERIDAE )
Setae of the three zoeae, megalopa and first crab instar of Dissodactylus crillitichelis are described in detail from laboratory reared specimens. Scanning electron microscopy showed that setae areExpand
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FEEDING ACTIVITIES OF TWO SPECIES OF CLYPEASTER (ECHINOIDES, CLYPEASTEROIDA): FURTHER EVIDENCE OF CLYPEASTEROID RESOURCE PARTITIONING
Clypeaster rosaceusand C. subdepressus have typical clypeasteroid feeding mech anisms and collect particulate material primarily by means oforal surface accessory podia with terminal suckers. TheyExpand
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COLLECTION OF FOOD BY ORAL SURFACE PODIA IN THE SAND DOLLAR, ECHINARACHNIUS PARMA (LAMARCK)
In Echinarachnius parma all spine types have cilia arranged in two bands along the shaft. Ciliary currents flow perpendicular to these bands and reversals were not observed. On the aboral surface theExpand
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The effects of stress on blood sugar composition of the lobster, Homarus americanus.
  • M. Telford
  • Biology, Medicine
  • Canadian journal of zoology
  • 1 September 1968
Freshly caught intermolt lobsters show a highly significant elevation of blood glucose after a few minutes of mild stress. Females show a significantly greater increase than males. The small amountsExpand
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Causes and Consequences of Fluctuating Coelomic Pressure in Sea Urchins.
We measured coelomic pressure in sea urchins to determine whether it was high enough to support a pneu hypothesis of growth. In Strongylocentrotus purpuratus the pressure was found to fluctuateExpand
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Domes, arches and urchins: The skeletal architecture of echinoids (Echinodermata)
SummaryA combination of simple membrane theory and statical analysis has been used to determine how stresses are carried in echinoid skeletons. Sutures oriented circumferentially are subjectExpand
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RESOURCE PARTITIONING BY SAND DOLLARS IN CARBONATE AND SILICEOUS SEDIMENTS: EVIDENCE FROM PODIAL AND PARTICLE DIMENSIONS
The sand dollars, Leodia sexiesperforata (Leske) and Encope michelini L. Agassiz, have overlapping geographical ranges and may co-occur in mixed flocks. Leodia is restricted entirely to biogenicExpand
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Ontogenetic regulatory mechanisms and evolution of mellitid lunules (Echinoidea, Clypeasteroida)
Lunules have evolved independently in several groups of clypeasteroids, including the Rotulidae, Astriclypeidae, Mellitidae and Scutasteridae. In this paper, only the monophyletic assemblageExpand
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