Polychaetous annelids, Nereis flavipes, p. 226 |
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226 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7
of 12 to 15 cones; area III with a broad patch of 10 to 12 smaller cones;
area IV with 18 to 24 tall cones disposed in a triangular patch, some of
which are heaviest on the maxillary ring, but along the inner side of IV
the cones are tiny; area V with none; area VI with 4 or 5 cones in a diamond or 2 irregular rows; areas VII and VIII with a row of larger cones
on the maxillary side and 2 or 3 rows of tiny cones on the oral side. In
one collection (900-38) some of the paragnaths are inserted on chitinous
plaques, much as shown by Fauvel (1914, pl. 14, fig. 6) for individuals
of N. zonata Malmgren.
Parapodia are typical except that in posterior parapodia the dorsal
lobe is notably reduced (pl. 35, fig. 52). Homogomph falcigerous notopodial setae are present from about the twentieth segment. The appendage is slightly curved but lacks teeth. Heterogomph falcigerous neuropodial setae have a short, curved appendage, the basal part about as long
as the hooked end, with obscure spinelets along the cutting edge.
In some specimens the peristomial ring is constricted, collarlike, much
narrower than the first podal segment, but about twice as long as the
latter.
These specimens are referred to N. pelagica Linnaeus with some
doubt because of the character of the posterior dorsal lobe (pl. 36, fig.
61).
Distribution.—Widely reported from littoral areas in all seas.
Nereis flavipes Ehlers
Plate 35, Figs. 49-51
Nereis flavipes Ehlers, 1868, pp. 549-552, pl. 21, figs. 26-30.
Collection.—728-37. One individual.
A single, complete individual, 40 mm long, has 71 setigerous segments. It agrees reasonably well with the description by Ehlers (1868, p.
549) for the type from the Adriatic Sea. Posterior notopodial lobes are
enlarged; the lobe ventral to the attachment of the dorsal cirrus is produced as a triangular elongation (pl. 35, fig. 51). Homogomph falcigerous notopodial setae are present from the nineteenth segment. They have
a smooth, falcate appendage (pl. 35, fig. 49). Neuropodial falcigerous setae have a short appendage, with delicate spinelets (pl. 35, fig. 50).
The proboscidial formula is as follows: area I with 2 unequal cones
in tandem; area II with a double row of small cones; area III with none;
area IV with about 15 cones in a crescentic patch; area V with none; area
VI with 6 or 7 taller cones in 2 rows; areas VII and VIII with very many
Object Description
Description
| Title | Polychaetous annelids, Nereis flavipes, p. 226 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-07-03~056.tiff |
| Full text | 226 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 of 12 to 15 cones; area III with a broad patch of 10 to 12 smaller cones; area IV with 18 to 24 tall cones disposed in a triangular patch, some of which are heaviest on the maxillary ring, but along the inner side of IV the cones are tiny; area V with none; area VI with 4 or 5 cones in a diamond or 2 irregular rows; areas VII and VIII with a row of larger cones on the maxillary side and 2 or 3 rows of tiny cones on the oral side. In one collection (900-38) some of the paragnaths are inserted on chitinous plaques, much as shown by Fauvel (1914, pl. 14, fig. 6) for individuals of N. zonata Malmgren. Parapodia are typical except that in posterior parapodia the dorsal lobe is notably reduced (pl. 35, fig. 52). Homogomph falcigerous notopodial setae are present from about the twentieth segment. The appendage is slightly curved but lacks teeth. Heterogomph falcigerous neuropodial setae have a short, curved appendage, the basal part about as long as the hooked end, with obscure spinelets along the cutting edge. In some specimens the peristomial ring is constricted, collarlike, much narrower than the first podal segment, but about twice as long as the latter. These specimens are referred to N. pelagica Linnaeus with some doubt because of the character of the posterior dorsal lobe (pl. 36, fig. 61). Distribution.—Widely reported from littoral areas in all seas. Nereis flavipes Ehlers Plate 35, Figs. 49-51 Nereis flavipes Ehlers, 1868, pp. 549-552, pl. 21, figs. 26-30. Collection.—728-37. One individual. A single, complete individual, 40 mm long, has 71 setigerous segments. It agrees reasonably well with the description by Ehlers (1868, p. 549) for the type from the Adriatic Sea. Posterior notopodial lobes are enlarged; the lobe ventral to the attachment of the dorsal cirrus is produced as a triangular elongation (pl. 35, fig. 51). Homogomph falcigerous notopodial setae are present from the nineteenth segment. They have a smooth, falcate appendage (pl. 35, fig. 49). Neuropodial falcigerous setae have a short appendage, with delicate spinelets (pl. 35, fig. 50). The proboscidial formula is as follows: area I with 2 unequal cones in tandem; area II with a double row of small cones; area III with none; area IV with about 15 cones in a crescentic patch; area V with none; area VI with 6 or 7 taller cones in 2 rows; areas VII and VIII with very many |
| Archival file | hancockunpub_Volume20/AHF-PUB-PE-07-03~056.tiff |
