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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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All Biocode files are based on field identifications to the best of the researcher’s ability at the time.
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Mature Platynereis dumerilii.
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Nereidid larvae are usually found at the 3-4 chaetiger stage in our samples. They have visible antennae and tentacular cirri projecting from the sides of the head, as well as a pair of anal cirri. The parapodia are well-developed and there are usually dark or reddish spots visible at the bases of two adjacent pairs, as shown above. This is presumably Nereis sandersi Blake, the only nereidid at 9°N.
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Nereidid larvae are usually found at the 3-4 chaetiger stage in our samples. They have visible antennae and tentacular cirri projecting from the sides of the head, as well as a pair of anal cirri. The parapodia are well-developed and there are usually dark or reddish spots visible at the bases of two adjacent pairs, as shown above. This is presumably Nereis sandersi Blake, the only nereidid at 9°N.
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Nereidid larvae are usually found at the 3-4 chaetiger stage in our samples. They have visible antennae and tentacular cirri projecting from the sides of the head, as well as a pair of anal cirri. The parapodia are well-developed and there are usually dark or reddish spots visible at the bases of two adjacent pairs, as shown above. This is presumably Nereis sandersi Blake, the only nereidid at 9°N.
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The prostomium (right) has two antennae and two large, two-segmented palps. The peristomium (segment behind the prostomium) has 4 pairs of tentacular cirri. This photo is a 3d composite made from a series of photos using a Keyence digital microscope. Photo by Dave Cowles, July 2009
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This dorsal view of the posterior body shows the prominent, straplike ligules with attached terminal cirrus which are characteristic of this species.
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This dorsal view of the parapodia shows the small aciculae with larger ventral and even larger dorsal lobes (ligules).
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Most of the setae are compound (composed of more than one segment). Closer examination by compound microscope would show this to be a homogomph falcigerous seta. A falciger is a seta in which the tip is comparatively blunt and curved. A homogomph seta is a compound seta in which the basal segment ends in a slightly expanded capsule, the two sides of which are of approximately equal height (as opposed to heterogomph, in which one side of the capsule is extended well out past the other).
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Nereis vexillosa, about 24 cm long, found at Padilla Bay. (Photo by: Dave Cowles, July 2009 )
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