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This protoconch is moderately large and has fine pitted sculpture over the entire surface, giving it a grainy appearance under the light microscope. It is flattened, so it will generally be found lying with the aperture down, and there are deep indentations at the sides of the aperture. From above, the outline of the shell is oval (photo above, left), but when viewed from the side the back of the shell comes to a blunt point, as if it had been compressed from the sides. The morphology and size match N. densata, the only species for which the protoconch is known (see Warén & Bouchet, 2001, p. 144 (Fig.15a-c) for SEM's of the protoconch) and it is the most likely candidate based on adult habitat (it is found at 13°N and the other species are from 21°N or Gorda Ridge), but we cannot eliminate the other possibilities.
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This protoconch is moderately large and has fine pitted sculpture over the entire surface, giving it a grainy appearance under the light microscope. It is flattened, so it will generally be found lying with the aperture down, and there are deep indentations at the sides of the aperture. From above, the outline of the shell is oval (photo above, left), but when viewed from the side the back of the shell comes to a blunt point, as if it had been compressed from the sides. The morphology and size match N. densata, the only species for which the protoconch is known (see Warén & Bouchet, 2001, p. 144 (Fig.15a-c) for SEM's of the protoconch) and it is the most likely candidate based on adult habitat (it is found at 13°N and the other species are from 21°N or Gorda Ridge), but we cannot eliminate the other possibilities.
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This is a moderately large protoconch, with shallow, coarse pitted sculpture over the entire shell, giving it a grainy appearance under the light microscope. The shell is dorsoventrally flattened, so it is usually found either with the aperture facing down or lying at an angle with the aperture visible. The posterior portion of the aperture flares out from the body, forming a deep indentation on both sides. The posterior of the shell is smoothly rounded.
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This is a moderately large protoconch, with shallow, coarse pitted sculpture over the entire shell, giving it a grainy appearance under the light microscope. The shell is dorsoventrally flattened, so it is usually found either with the aperture facing down or lying at an angle with the aperture visible. The posterior portion of the aperture flares out from the body, forming a deep indentation on both sides. The posterior of the shell is smoothly rounded.
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This is a moderately large protoconch, with shallow, coarse pitted sculpture over the entire shell, giving it a grainy appearance under the light microscope. The shell is dorsoventrally flattened, so it is usually found either with the aperture facing down or lying at an angle with the aperture visible. The posterior portion of the aperture flares out from the body, forming a deep indentation on both sides. The posterior of the shell is smoothly rounded.
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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live specimen
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whole specimen dorsal. Specimen ID: 9364161. Field no.: Pescadero2017OpportunisticGastropod12. Image quality: 1. Aspect ratio: 1.499.