Naineris grubei ( Gravier, 1908 )

Blake, James A., 2017, Polychaeta Orbiniidae from Antarctica, the Southern Ocean, the Abyssal Pacific Ocean, and off South America, Zootaxa 4218 (1), pp. 1-145 : 101-103

publication ID

https://doi.org/ 10.5281/zenodo.245827

publication LSID

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DOI

https://doi.org/10.5281/zenodo.4901815

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scientific name

Naineris grubei ( Gravier, 1908 )
status

 

Naineris grubei ( Gravier, 1908)

Figures 48–50 View FIGURE 48 View FIGURE 49 View FIGURE 50

Scoloplos grubei Gravier, 1908: 42 –43; 1909: 646–649, pl. 18, figs. 49–57. Naineris grubei: Hartman 1957: 303 ; Blake 1996: 20 –22, fig. 1.8.

Material examined. Northern Chile, Iqique, LUCE Sta. M-131, intertidal, red rocks in pools (1, SMNH 154447 View Materials ) .— Southern Chile, Seno Reloneavi, Canal Tenglo, between Isla Tengo and Angelmó, LUCE Sta. M-13, 0– 6 m (1, SEM, JAB); Seno Reloneavi , Isla Tenglo, the bay on the South Side , LUCE Sta. M-60, intertidal (4, SMNH 154440 View Materials ) ; Bahía de Ancud, between Punta San Antonio and Punta Colorado, LUCE Sta. M-55, intertidal (1, SMNH 154444 View Materials ); Golf Corcovado, Boca del Guafo , Isla Guafo, the anchorage E of Punta Weather, LUCE Sta. M-70A, 25 m (1, SMNH 154450 View Materials ) ; Golfo de Ancud, Canal Caicaen, E of the mouth of Canal Quigua, LUCE Sta. M- 45, 18 m (1, SEM, JAB).— Straits of Magellan , near the estuary of Río los Ciervos, S of Punta Arenas, LUCE Sta. M-115, intertidal (1, SMNH 154449 View Materials ) .

Description. All specimens incomplete; largest fragment nearly complete, 85 mm long and 2.4 mm wide for 146 setigers. Color in alcohol: dark brown.

Largest specimens with prostomium truncate, slightly rounded on frontal margin ( Figs. 48 View FIGURE 48 A, 49A, 50A); eyespots lacking; smaller specimens with prostomium more pear-shaped, blunt on anterior margin ( Fig. 48 View FIGURE 48 A); peristomium with two achaetous rings in juveniles and smaller specimens ( Fig. 49 View FIGURE 49 A), reduced to a single achaetous ring in larger specimens ( Figs. 48 View FIGURE 48 A, 50A); proboscis not observed. Thoracic region with 19–20 setigers (17 according to Gravier 1909), appearing dorsally compressed; abdominal segments cylindrical in cross-section.

Thoracic notopodia elongate, cirriform from setiger 1 ( Fig. 48 View FIGURE 48 B), continuing through thoracic ( Fig. 50 View FIGURE 50 B) and abdominal setigers; neuropodia swollen, bearing large fascicles of setae and a single fingerlike postsetal lobe from setiger 1 ( Fig. 48 View FIGURE 48 B); abdominal neuropodia simple, bluntly rounded, bearing a short ventral cirrus ( Fig. 48 View FIGURE 48 C); a distinct ventral flange present; interramal cirrus lacking.

Thoracic notosetae including 30–35 long, crenulated capillaries; abdominal notopodia with 15 or more capillaries and 5–6 furcate setae; furcate setae with unequal tynes having blunted, notched tips, tynes connected by row of fine needles appearing as a thin membrane in light microscopy, shaft with ribs along one edge ( Figs. 48 View FIGURE 48 H, 49D), in SEM 6–7 needles on either side, merging with tynes; tynes with distinct openings on tips (see arrows, Fig. 50 View FIGURE 50 E).

Thoracic neurosetae including 7–8 rows of numerous uncini and two rows of crenulated capillaries ( Fig. 50 View FIGURE 50 C); uncini with ribbed shaft and a bluntly rounded tip bearing a terminal notch, appearing bifid in some angles; entire end of shaft and tip with distinct lateral flange appearing hood-like in certain views ( Figs. 48 View FIGURE 48 D–G, 49 B–C, 50D), smaller specimens with tips of uncini appearing more notched, probably due to less wear ( Fig. 49 View FIGURE 49 B–C); abdominal neurosetae including 1–2 thin protruding aciculae with curved blunted tips, sometimes with thin membranous mucron ( Fig. 48 View FIGURE 48 I), and 5–6 thin crenulated capillaries.

Branchiae from setiger 4 on all specimens ( Figs. 48 View FIGURE 48 A, 49A, 50A); branchiae small, conical at first, increasing in size rapidly over following setigers, becoming cirriform with broad base and tapering to pointed tip; branchiae on abdominal segments considerably larger than on thoracic segments, triangular in shape; branchiae heavily ciliated on both margins. Bases of abdominal branchiae close together, joined by low transverse ridge. Middle thoracic through anterior abdominal segments with pair of oval-shaped dorsal sense organs medial and anterior to branchial bases.

Remarks. Naineris grubei is closely related to N. furcillata in the shape of the prostomium, number of thoracic setigers, and distribution and form of the setae. The two species differ in that the notopodia of posterior thoracic and abdominal setigers in N. furcillata have a distinctly forked appearance, whereas in N. grubei the notopodium is simple and entire throughout. Both species have abdominal neuropodia with a short ventral cirrus. The main difference between N. grubei and other congeners is in the nature of the notched or bidentate tips of the thoracic neuropodial uncini.

The new collections provide an opportunity to expand the original descriptions of Gravier (1908, 1909). The number of thoracic setigers was reported to be 17 in the original description, while the specimens from the Lund University Chile Expedition always have 19–20. The branchiae consistently begin on setiger 4 in the Lund materials, whereas Gravier (1909) indicated that they began on setiger 7 on his specimen from Peru. The small oval dorsal sensory organs of thoracic and anterior abdominal setigers do not appear to have been reported previously. The difference in the number of thoracic setigers and position of the first pair of branchiae between the original account of Gravier (1908, 1909) and the new materials from Chile are likely due to size of the specimens. Graviers’ specimens were smaller, less than 5 mm long and with less than 50 segments. These correspond closely with small specimens considered to be juveniles and identified as N. cf. grubei by Blake (1996) from southern California where the number of thoracic setigers ranged from 8–13 and branchiae first occurred from setiger 5–6.

Naineris grubei australis Hartman, 1957 , an Australian species, was recently redescribed by Zhadan et. al. (2015). This subspecies, however, differs significantly from the stem form described here in having an entirely different kind of thoracic neuropodial uncini. In N. g rubei from South America, the thoracic neuropodial uncini have numerous transverse ribs on the shaft and a bluntly rounded tip bearing a terminal notch that apically appears bifid in most angles; a lateral flange is also present. In contrast, N. grubei australis has the transverse ribs and lateral sheath, but the notch is elongate and terminates in a smoothly rounded tip, not one that is bifid. In addition, Zhadan et al. (2015) report and illustrate subuluncini among the uncini of thoracic neuropodia of N. grubei australis . Subuluncini are not present in N. grubei reported in this study. For this reason, the subspecies from Australia should be raised to full species status: Naineris australis New Status.

Distribution. Ecuador, Peru, and Chile, intertidal to 25 m.

SMNH

Saskatchewan Museum of Natural History

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Family

Orbiniidae

Genus

Naineris

Loc

Naineris grubei ( Gravier, 1908 )

Blake, James A. 2017
2017
Loc

Scoloplos grubei

Blake 1996: 20
Hartman 1957: 303
Gravier 1908: 42
1908