Leitoscoloplos nasus, Blake, James A., 2017
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.4901757 |
persistent identifier |
https://treatment.plazi.org/id/8F2387DD-060A-092C-FF31-FAD7FD0BFDFC |
treatment provided by |
GgServerImporter |
scientific name |
Leitoscoloplos nasus |
status |
sp. nov. |
Leitoscoloplos nasus View in CoL new species
Figure 14 View FIGURE 14
Material examined. Antarctic Peninsula, Eltanin Station 6-439, 0 9 Jan 1963, 63.83°S, 62.60°W, 128–165 m, holotype and 3 paratypes, USNM 1407121–2 View Materials ). GoogleMaps
Description. All specimens posteriorly incomplete; holotype 8.7 mm long, 0.6 mm wide, for 37 segments; largest paratype 8.3 mm long, 0.35 mm wide for 33 segments. Body rounded in cross section, with thoracic region slightly inflated. Thorax with 9–10 setigers, with each segment wider than long ( Fig. 14 View FIGURE 14 A–B). Transition from thorax abrupt, denoted by reduction in number of neurosetae and change in form of neuropodial postsetal lobes. Abdominal segments narrow at first, then becoming elongate, nearly twice as long as wide with parapodia at posterior end of each elongated segment ( Fig. 14 View FIGURE 14 C). Color in alcohol: brown.
Prostomium elongate, more than twice as long as wide; tapering anteriorly to narrow, rounded tip, sometimes curved dorsally; eyespots absent; with paired nuchal organs. Peristomium short asetigerous ring, together with prostomium forming unusually elongate “head” ( Fig. 14 View FIGURE 14 A–B)
Thoracic notopodia short, papillate on setiger 1 and sometimes setiger 2, then becoming long, fingerlike over remaining thoracic setigers; abdominal notopodia elongate, becoming narrow more posteriorly ( Fig. 14 View FIGURE 14 C–D). Thoracic neuropodia similar to notopodial lamellae, but overall shorter and more triangular. Abdominal neuropodia, short, thickened basally, notched distally; with subpodial flange ( Fig. 14 View FIGURE 14 D).
Thoracic setae all long crenulated capillaries. Abdominal notopodia with 6–8 crenulated capillaries and 1–2 furcate setae; furcate setae with thin needles forming web between subequal tynes; barbs on shaft not apparent in light microscopy ( Fig. 14 View FIGURE 14 E). Abdominal neuropodia with 2–3 thin, non-crenulated capillaries ( Fig. 14 View FIGURE 14 D).
Branchiae from setiger 13–14, continuing to end of fragment; each branchia short, narrowing to rounded apex, barely longer than notopodial lobes in thoracic segments, shorter in abdominal segments ( Fig. 14 View FIGURE 14 D). Pygidium unknown.
Etymology. The epithet is derived from the Latin nasus (m), for nose, to denote the usually elongate and narrow prostomium-peristomium that characterizes this species.
Remarks. Leitoscoloplos nasus n. sp. is another Antarctic species in the L. kerguelensis group with a reduced number of thoracic setigers and branchiae from anterior abdominal segments. The species is easily recognized and distinguished from other species of the genus in Antarctica and elsewhere by the elongate and unusually narrow “head” consisting of the prostomium-peristomium, and by the long, narrow abdominal segments. Leitoscoloplos drakei described below also has elongate abdominal segments, but this species is thin and threadlike with branchiae limited to far posterior segments.
Distribution. Antarctic Peninsula, 128– 165 m.
USNM |
Smithsonian Institution, National Museum of Natural History |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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