Leitoscoloplos eltaninae, 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 : 34-35

publication ID

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

publication LSID

lsid:zoobank.org:pub:9345C596-8656-4B5C-AD8C-2FACF4E9240C

DOI

https://doi.org/10.5281/zenodo.4901759

persistent identifier

https://treatment.plazi.org/id/8F2387DD-0634-092F-FF31-FD64FCD4FCBF

treatment provided by

GgServerImporter

scientific name

Leitoscoloplos eltaninae
status

sp. nov.

Leitoscoloplos eltaninae View in CoL new species

Figure 15 View FIGURE 15

Material examined. South Atlantic Ocean, South Georgia Island, N of Shag Rocks , Eltanin Sta. 22-1527, 0 9 Jan 1963, 63.83°S, 62.60°W, 3742–3806 m, holotype and 3 paratypes ( USNM 69403–4 View Materials ). GoogleMaps

Description. All specimens posteriorly incomplete; holotype 16 mm long and 2 mm wide for 40 segments; paratypes of similar size. Color in alcohol: brown with darker pigment markings on prostomium and some anterior segments. Body rounded in cross section, with thoracic region slightly depressed; one paratype with mid-ventral line of body inverted, forming long groove. Transition from thorax abrupt, denoted by reduction in number of neurosetae and change in form of neuropodial postsetal lobes.

Prostomium conical, pointed anteriorly ( Fig. 15 View FIGURE 15 A); without distinct eyespots, but with several groups of small pigment spots ( Fig. 15 View FIGURE 15 B). Peristomium formed of single tapering achaetous ring.

Thorax with 10 setigers ( Fig. 15 View FIGURE 15 A). Notopodia of setigers 1–3 inconspicuous, with short triangular-shaped digitiform postsetal lobes from setiger 4 ( Fig. 15 View FIGURE 15 C), becoming bilobed in abdominal setigers, with ventral lobes shorter than dorsal ( Fig.15 View FIGURE 15 D). Thoracic neuropodia with tapering digitiform postsetal lobes ( Fig. 15 View FIGURE 15 C); abdominal neuropodia becoming apically thicker and more erect ( Fig. 15 View FIGURE 15 D).

Thoracic setae all long crenulated capillaries. Abdominal notopodia with crenulated capillaries and 3–4 furcate setae; furcate setae with thin needles forming web between subequal tynes; with rows of short barbs on shaft ( Fig. 15 View FIGURE 15 E). Abdominal neuropodia with 3–4 thin, non-crenulated capillaries and 2–3 imbedded simple aciculae.

Branchiae from setiger 20, continuing to end of fragment; each branchia short, stubby, barely longer than notopodial lobes ( Fig. 15 View FIGURE 15 D). Pygidium unknown.

Holotype and one paratype with large, irregularly shaped ova, measuring 450–500 µm in largest dimension.

Etymology. This species is named for the USNS Eltanin, former research vessel of the United States Antarctic Research Program.

Remarks. Leitoscoloplos eltaninae n. sp. is a deep-sea species that belongs to the L. kerguelensis group in having branchiae first present from anterior abdominal segments. It is closest to L. rankini n. sp., described below, in having a thorax with 10 setigers and branchiae from similar setigers (setiger 18 in L. rankini n. sp.; setiger 20 in L. eltaninae n. sp.). The two species differ in that L. eltaninae n. sp. has bilobed abdominal notopodia and entire neuropodia, whereas L. rankini n. sp. has undivided, fingerlike abdominal notopodia and bilobed neuropodia. In L. eltaninae n. sp. the branchiae are short and stubby, while in L. rankini n. sp. the branchiae are long and thin.

Distribution. South Atlantic Ocean, 3742–3806 m.

USNM

Smithsonian Institution, National Museum of Natural History

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