Berkeleyia heroae , Blake, James A., 2017

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: 10

publication ID 10.5281/zenodo.245827

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Berkeleyia heroae

new species

Berkeleyia heroae  new species

Figures 1–2View FIGURE 1View FIGURE 2 A –E

Material examined. Argentina, Staten Island , off Tierra del Fuego, Hero Sta.  71-2- 16, 27 Apr 1971, 54.773°S, 64.712°W, intertidal, low water, holotype ( USNM 60633View Materials); Sta. 71-2GoogleMaps  - 39, 24 Oct 1971, 54.797°S, 65.27°W, intertidal to 1 m, 3 paratypes (USNM 60634).

Description. Holotype complete, 9.5 mm long and 0.6 mm wide for 48 setigerous segments; largest paratype 9.7 mm long and 0.6 mm wide for 48 setigers. Color in alcohol: brown with several dark, diffuse pigment spots on prostomium. Thoracic region with 9–10 setigers, somewhat flattened dorsally; abdominal segments cylindrical in cross section. First 10–11 abdominal setigers with parapodia gradually shifted dorsally becoming fully shifted in middle and posterior setigers.

Prostomium conical, more or less rounded on anterior end ( Fig. 1View FIGURE 1 A); without eyespots. Peristomium about twice as long as subsequent setigers, with paired ciliated nuchal organs on anterolateral margin ( Figs. 1View FIGURE 1 A, 2A).

Thoracic and abdominal notopodia similar throughout body, with short, papillate postsetal lobes ( Fig. 1View FIGURE 1 A –B). Thoracic neuropodia similar to notopodia; abdominal neuropodia with short, conical lobe and low presetal lamella ( Fig. 2View FIGURE 2 B).

Thoracic parapodia with long crenulated capillaries. Abdominal notopodia with crenulated capillaries and 1–2 delicate furcate setae ( Figs. 1View FIGURE 1 C, 2E); furcate setae with 5–6 more or less basally fused, thin needles between tynes and rows of fine barbs on shaft ( Fig. 1View FIGURE 1 D); with SEM, rows of barbs on shaft observed to merge with bases of needles and with both structures continuous ( Fig. 2View FIGURE 2 E); tynes with tips bearing openings only visible with SEM ( Fig. 2View FIGURE 2 E). Abdominal neuropodia with 2–3 capillaries and 2–3 projecting spines; each spine with bidentate forked tips and transverse rows of barbs shaft ( Figs. 1View FIGURE 1 C; 2C –D).

Branchiae from abdominal setiger 19–24, continuing to posterior end ( Fig. 1View FIGURE 1 B); anterior branchiae short, then becoming long, straplike. Pygidium with anus directed posteriorly located between two lobes, each bearing terminal anal cirrus ( Fig. 1View FIGURE 1 B). Large elongate ova, approximately 75 µm in diameter, present in anterior abdominal segments of one paratype.

Etymology. The species is named for the R/V Hero  , former research vessel of the National Science Foundation.

Remarks. Berkeleyia heroae  n. sp. has abdominal neuropodial acicular spines with bifid tips, the parapodia are reduced, with only short, conical postsetal lobes, the prostomium is conical, yet rounded on the anterior margin and the thoracic region is slightly flattened instead of inflated. This species differs from the type species B. profunda  as well as B. abyssala  n. sp., B. weddellia  n. sp., and B. hadala  n. sp. (below) in having bidentate neuropodial acicular spines instead of unidentate.

Distribution. Argentina, Staten Island, intertidal to 1 m.


Smithsonian Institution, National Museum of Natural History