Sternaspis buzhinskajae
| Notice: | This page is derived from the original publication listed below, whose author(s) should always be credited. Further contributors may edit and improve the content of this page and, consequently, need to be credited as well (see page history). Any assessment of factual correctness requires a careful review of the original article as well as of subsequent contributions.
If you are uncertain whether your planned contribution is correct or not, we suggest that you use the associated discussion page instead of editing the page directly. This page should be cited as follows (rationale):
Citation formats to copy and paste
BibTeX: @article{Salazar-Vallejo2014Zootaxa3861, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Salazar-Vallejo2014Zootaxa3861">{{Citation |
Ordo: Terebellida
Familia: Sternaspidae
Genus: Sternaspis
Name
Sternaspis buzhinskajae Salazar-Vallejo, Sergio I., 2014 – Wikispecies link – Pensoft Profile
- Sternaspis buzhinskajae Salazar-Vallejo, Sergio I., 2014, Zootaxa 3861: 334-337.
Materials Examined
Type material. Beaufort Sea. Alaska. Holotype (CAS9853), R.V. Ivik, off Point Barrow, Sta. 51 - 34, 3.5 –5.0 m, 2 Aug. 1951, J. Böhlke, coll. One paratype (CAS22618), Camden Bay, Sta. D 5 B 105 (70 °02' 48 " N, 144 ° 54 ' 24 " W), 10 m, 20 Aug. 1977, J. Cordell & A.C. Broad, coll. (19 mm long, 8 mm wide; left shield plate 4.0 mm long, 3.8 mm wide). Bering Sea. Ten paratypes (CAS19261), juveniles, NNW off Amak Island, Alaska Peninsula, Sta. MB 19 18 (56 ° 40 ' N, 163 ° 57 ' W), 76 m, 24 May 1976, M. Freeman, coll. (7.5 –11.0 mm long, 4–6 mm wide; left shield plate 2.2–2.7 mm long, 2.1–2.8 mm wide). Four paratypes (CAS19372), NNW Saint Paul Island, Sta. MB 64 24 (58 °00' N, 171 °05' W), 90 m, 27 May 1976, M. Freeman, coll. (10.0–13.0 mm long, 5.5 –7.0 mm wide; left shield plate 2.5–3.4 mm long, 2.7–3.4 mm wide). Additional material. Bering Sea.33 specimens (LACM5711), dried-out, Aleutian Cruise, Sta. 83 (63 °06' N, 171 ° 42 ' W), off S end of Saint Lawrence Island, 55 m, sandy silt, 8 Aug. 1949 (9–15 mm long, 3–5 mm wide, ventro-caudal shield left plate 2.7–4.3 mm long, 2.7–4.5 mm wide). Two specimens (LACM5712), partly dehydrated, one with introvert exposed, Aleutian Cruise, Sta. 148 (57 ° 34 ' N, 166 ° 36 ' W), N off Umivak Island, 66 m, sandy silt, 27 Aug. 1949 (specimen with introvert exposed 15 mm long, 7 mm wide, ventro-caudal shield left plate 5 mm long, 4.5 mm wide). 16 specimens (LACM5710), dried-out, Aleutian Cruise, Sta. 153 (56 ° 45 ' N, 166 ° 18 ' W), NW off Umivak Island, 73 m, sandy silt, 27 Aug. 1949 (5.5 –10.0 mm long, 4.0– 7.5 mm wide, ventrocaudal shield left plate 1.9–3.5 mm long, 1.9–3.5 mm wide). Chukchi Sea. Four specimens (LACM5709), partly dehydrated, Aleutian Cruise, Sta. 108 (70 °05' N, 165 ° 22 ' W), NW off Icy Cape, 38 m, sandy silt, 18 Aug. 1949 (8–12 mm long, 3–5 mm wide, ventro-caudal shield left plate 2.3–3.4 mm long, 2.3–3.3 mm wide). 18 specimens (ZIRAS1448 108), North Pole Field Station, St. 15 (71 ° 50.2 ' N, 175 °54.0' W), 63 m, 10 Aug. 1946, A.P. Andriyashev, coll. (8.9–26.5 mm long, 6.0– 13.5 mm wide, left shield plate 1.0– 5.5 mm long, 1.0– 6.3 mm wide). Okhotsk Sea. 11 specimens (ZIRAS28053 4), juveniles, damaged, off New Siberian Islands (77 ° 20.5 ' N, 135 ° 47 ' E), 38 m, 10 Nov. 1901 (11–15 mm long, 5.5–11 mm wide; left shield plate 2.3–3.5 mm long, 3.0–4.0 mm wide).
Description
Description. Holotype (CAS9853) complete (Fig. 1 A). Body pale brownish, introvert slightly pinkish, laterally broken exposing inner organs, constriction or waist segments well-defined, visible dorsally; ventro-caudal shield dark red with darker marginal band, margins pale or whitish. Introvert integument eroded, abdomen finely papillose. Body 22 mm long, 6.5 mm wide, abdomen 16 mm long; left ventro-caudal shield plate 5.3 mm long, 5.0 mm wide. Prostomium smooth, oblong, wider than long, projected, covered by exposed pharynx, visible in side view. Eyespots not seen. Peristomium narrow, covered by pharynx; papillae small, abundant, covering peristomium, extending to margin of first chaetiger.
Introvert partly covered by pharynx and inner organs; chaetigers with 12–14 brassy falcate hooks (Figs 1 B, 2 E), most with tips broken, with subdistal darker areas; few with mucrons. Genital papillae large, cirriform, corrugate, with similar pigmentation as abdomen, emerging from intersegmental area between segments 7 and 8. Anterior abdomen with 7 segments, papillae mostly eroded, arranged in groups; first four abdominal segments with two alternate series, posterior segments with a single series. Capillaries not seen.
Ventro-caudal shield surface with ribs and concentric lines (Fig. 1 A, C). Anterior margins round, markedly projected, anterior depression deep. Anterior keels half as long as anterior projections. Suture visible throughout shield. Lateral margins rounded, expanded posteriorly, smooth. Fan markedly projecting posteriorly beyond posterior corners level, median notch deep, wide; lateral notches shallow, margin markedly crenulated forming single, large semicircular projections per rib.
Marginal chaetal fascicles damaged, many chaetae broken, 10 lateral and 7 posterior fascicles with all chaetae arranged obliquely. Peg chaetae mostly broken, bases visible, some long delicate chaetae still attached.
Branchiae abundant, very thin, long, coiled; interbranchial papillae long, curled, often thinner than branchiae. Branchial plates anteriorly wider, posteriorly tapered, rounded. Anal peduncle not exposed.
Variation. Smaller specimens paler (Fig. 2 A, C), with prostomium hemispherical and fewer introvert hooks per chaetiger. Ventro-caudal shield with anterior projections, fan less prominent, and anterior keels variably visible (Fig. 2 B, D). Fan’s median notch visible in smallest specimens, markedly deeper than laterals and having crenulate margins, but less developed projections per rib than in r large specimens (Fig. 1 F). Bodies ranged from 6–19 mm long, 1–8 mm wide; left shield plate 1–4 mm long, 1–3.8 mm wide.
The pigmented, concentric bands are variable; sometimes the orange to red contrast is more marked than in other specimens, especially among ZIRAS materials (Chukchi and Okhotsk Seas), but the general shield shape is relatively consistent as described above. Another difference is the relative thickness of integument covering the shield, being thicker in the ZIRAS specimens but again, because the overall shield shape is consistent, they are regarded as belonging to the same species.
Etymology
Etymology. This species is named after Dr. Galina Buzhinskaja, from the Zoological Institute, Russian Academy of Sciences, Saint Petersburg, in recognition of her many publications on polychaetes and especially because of her unlimited generosity and support to my research activities. The epithet is a noun in the genitive case formed after the stem of her last name (buzhinskaj).
Discussion
Remarks. The California Academy of Sciences specimens of S. buzhinskajae n. sp. were identified as S. scutata (Ranzani, 1817), but they differ because in S. buzhinskajae the shield has larger, usually exposed anterior keels, and the fan is more projected posteriorly beyond the lateral corners. It is also similar to S. fossor (Stimpson, 1853), but in S. buzhinksajae the lateral notches are deeper, the fan is more markedly projected, and its margin is strongly crenulated to denticulate.
Distribution
Distribution. Arctic Ocean; Okhost, Chukchi, Bering and Beaufort Seas, in 3.5 –90.0 m.
Taxon Treatment
- Salazar-Vallejo, Sergio I.; 2014: Three new polar species of Sternaspis Otto, 1821 (Polychaeta: Sternaspidae), Zootaxa 3861: 334-337. doi
This treatment was originally uploaded by Plazi, compare this treatment on Plazi. Unless this treatment has been substantially changed on Species-ID, Plazi requests to maintain a link back to the original repository.
