Polychaetous annelids, Nephthys magellanica, p. 238 |
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238 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7
Augener (1918, p. 159) added to the original description, based on
collections from west Africa and a reexamination of the types. This study
reveals the presence of postlamellar lobes that are notably shorter than
those in specimens from the Pacific (pl. 41, figs. 98, 99). Also, the bars of
the preacicular setae are proportionately broader. These differences, however, do not seem sufficiently basic to warrant the erection of another name.
Monro (1933, p. 140) questionably referred some fragmentary specimens to this species. These agree with the individuals herein noted in
having a "long, leaf-shaped, pointed, ventral posterior lamella." Whether
or not the dorsal lamella is also long is not made known.
Distribution.—Off Florida; west Africa; Gorgona Island, Ecuador;
Colombia; Gulf of California; Catalina Island, California. Subinter-
tidal, to 118 fms.
Nephthys magellanica Augener
Plate 41, Figs. 100-103
Nephthys magellanica Augener, 1912, pp. 208-211, figs. 27, 28.
Nephthys magellanica Hartman, 1938, pp. 146-147, fig. 62 (synonymy).
Collections.—259-34, 279-34, 285-34, 438-35, 456-35, 530-35, 533-
36, 549-36, 577-36, 620-37, 628-37, 662-37, 675-37, 677-37, 692-37,
696-37, 702-37, 705-37, 706-37, 725-37, 732-37, 734-37, 747-37, 833-
38, ?843-38, 845-38, 870-38, Ace. 600. Numerous specimens.
The prostomium is broad, spatulate, with a pair of deeply embedded,
black eye spots. Some individuals have a dark blotch near the middle (pl.
42, fig. 109). The nuchal organs, conspicuous when everted, lie proximal
to the first notopodial lobe (pl. 41, fig. 100). The proboscis has a median
dorsal papilla and 22 rows distally. It is smooth proximally.
Recurved cirri are digitiform, present from the third setigerous segment. Setae are long, silky, flowing, including three kinds. The preacicular setae are barred (pl. 41, fig. 101). Postacicular setae are of two kinds.
They include numerous long, serrulated setae, with transverse rows of
spines limited more or less to the broadest part (pl. 41, figs. 103, 104),
and paler, lanceolate, finely denticulated setae (pl. 41, fig. 102) present
posterior to the twenty-fifth segment. There is, in addition, a smaller,
shorter, postacicular seta, intergrading with these two, in which the
exposed bases are finely pilose.
Specimens from Independencia Bay, Peru (833-38), differ somewhat
from the others in that the postsetal lamellae are longer and distally more
acute.
Distribution.—Straits of Magellan, north to southern California;
Gulf of California. Subintertidal, to 75 fms.
Object Description
Description
| Title | Polychaetous annelids, Nephthys magellanica, p. 238 |
| Type | texts |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-07-03~068.tiff |
| Full text | 238 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 Augener (1918, p. 159) added to the original description, based on collections from west Africa and a reexamination of the types. This study reveals the presence of postlamellar lobes that are notably shorter than those in specimens from the Pacific (pl. 41, figs. 98, 99). Also, the bars of the preacicular setae are proportionately broader. These differences, however, do not seem sufficiently basic to warrant the erection of another name. Monro (1933, p. 140) questionably referred some fragmentary specimens to this species. These agree with the individuals herein noted in having a "long, leaf-shaped, pointed, ventral posterior lamella." Whether or not the dorsal lamella is also long is not made known. Distribution.—Off Florida; west Africa; Gorgona Island, Ecuador; Colombia; Gulf of California; Catalina Island, California. Subinter- tidal, to 118 fms. Nephthys magellanica Augener Plate 41, Figs. 100-103 Nephthys magellanica Augener, 1912, pp. 208-211, figs. 27, 28. Nephthys magellanica Hartman, 1938, pp. 146-147, fig. 62 (synonymy). Collections.—259-34, 279-34, 285-34, 438-35, 456-35, 530-35, 533- 36, 549-36, 577-36, 620-37, 628-37, 662-37, 675-37, 677-37, 692-37, 696-37, 702-37, 705-37, 706-37, 725-37, 732-37, 734-37, 747-37, 833- 38, ?843-38, 845-38, 870-38, Ace. 600. Numerous specimens. The prostomium is broad, spatulate, with a pair of deeply embedded, black eye spots. Some individuals have a dark blotch near the middle (pl. 42, fig. 109). The nuchal organs, conspicuous when everted, lie proximal to the first notopodial lobe (pl. 41, fig. 100). The proboscis has a median dorsal papilla and 22 rows distally. It is smooth proximally. Recurved cirri are digitiform, present from the third setigerous segment. Setae are long, silky, flowing, including three kinds. The preacicular setae are barred (pl. 41, fig. 101). Postacicular setae are of two kinds. They include numerous long, serrulated setae, with transverse rows of spines limited more or less to the broadest part (pl. 41, figs. 103, 104), and paler, lanceolate, finely denticulated setae (pl. 41, fig. 102) present posterior to the twenty-fifth segment. There is, in addition, a smaller, shorter, postacicular seta, intergrading with these two, in which the exposed bases are finely pilose. Specimens from Independencia Bay, Peru (833-38), differ somewhat from the others in that the postsetal lamellae are longer and distally more acute. Distribution.—Straits of Magellan, north to southern California; Gulf of California. Subintertidal, to 75 fms. |
| Archival file | hancockunpub_Volume20/AHF-PUB-PE-07-03~068.tiff |
