Chaetocirratulus pinguis Hartman, 1978

Blake, James A., 2018, Bitentaculate Cirratulidae (Annelida, Polychaeta) collected chiefly during cruises of the R / V Anton Bruun, USNS Eltanin, USCG Glacier, R / V Hero, RVIB Nathaniel B. Palmer, and R / V Polarstern from the Southern Ocean, Antarctica, and off Western South America, Zootaxa 4537 (1), pp. 1-130 : 68-69

publication ID

https://doi.org/ 10.11646/zootaxa.4537.1.1

publication LSID

lsid:zoobank.org:pub:169CBE5C-3A6E-438B-8A81-0491CBFBAC85

DOI

https://doi.org/10.5281/zenodo.3798550

persistent identifier

https://treatment.plazi.org/id/03A2CB16-FFB6-A20E-FF36-FC0EFEEDFC60

treatment provided by

Plazi

scientific name

Chaetocirratulus pinguis Hartman, 1978
status

comb. nov.

Chaetocirratulus pinguis Hartman, 1978 View in CoL , new combination

Figure 36 View FIGURE 36

Chaetozone pinguis Hartman, 1978:166 View in CoL , fig. 18a–c; Usha et al. 2014: 917.

Cirratulus patagonicus: Hartman 1978: 166 View in CoL . Not Kinberg 1866.

Material examined. Weddell Sea, USCG Glacier Sta. 69-1, 24 Feb. 1969 , 74°28.1ʹS, 30°31.7ʹW, 513 m, holotype ( USNM 46782 About USNM ) and 13 paratypes ( USNM 46783 About USNM ); Sta. 68-5, 9 Feb 1968 GoogleMaps , 76°00ʹS, 55°00ʹW, 400 (1, USNM 46800 About USNM ); Sta. 69-7, coll. 01 March 1969 GoogleMaps , 77°16ʹS, 42°38ʹW, 512 m, (1, USNM 490733 About USNM ); Weddell Sea, east of former Larsen Ice Shelf A Area GoogleMaps , RVIB Nathaniel B. Palmer Cr. 2000-03, coll. J.A. Blake, Sta. 26, 23 May 2000. 64°39.564ʹS, 059°13.226ʹW, SM grab, 564 m (1, MCZ 149836 About MCZ ).— East Antarctic Peninsula, Prince Gustav Channel , RVIB Nathaniel B. Palmer Cr. 2000-03, coll. J.A. Blake , SM grab, Sta. 01, 14 May 2000 , 64°17.625´S, 058°34.678´W. 768 m (1, JAB); Sta. 34, 24 May 2000 GoogleMaps , 64°10.995ʹS, 058°34.140ʹW, 865 m (5, MCZ 149837 About MCZ ; 1 SEM stub, JAB); N of Larsen Ice Shelf Area A, off Lindenberg Island GoogleMaps , RVIB Nathaniel B. Palmer Cr. 2000-03, coll. J.A. Blake , SM grab, Sta. 03, 15 May 2000 , 64°53.533ʹS, 059°30.694ʹW, 385m (1, MCZ 149838 About MCZ ); former Ice Shelf A Area, Greenpeace Trough GoogleMaps , RVIB Nathaniel B. Palmer Cr. 2000-03, coll. J.A. Blake , SM grab, Sta. 22, 20 May 2000 , 64°46.632ʹS, 060°21.557ʹW, 868 m (1, LACM-AHF Poly 10214); Sta. 12, 19 May 2000 GoogleMaps , 64°55.101ʹS, 060°24.459ʹW, 317 m (1, LACM-AHF Poly 10215); former Ice Shelf A Area, border with Larsen B GoogleMaps , RVIB Nathaniel B. Palmer Cr. 2000-03, coll. J.A. Blake , SM grab, Sta. 13, 19 May 2000 , 64°53.517ʹS, 060°28.836ʹW, 323 m (1, LACM-AHF Poly 10216); Sta. 14, 19 May 2000 GoogleMaps , 64°51.818ʹS, 060°33.438ʹW, 419 m (4, LACM-AHF Poly 10217).— South Shetland Islands, Clarence Island GoogleMaps , USNS Eltanin, Cr. 12, Sta. 1089, 17 Apr 64, 60.78°S, 53.507°W, Blake trawl, 641 m (1, USNM 1013943 About USNM ).— Ross Sea, Pennell Bank, off Ross Ice shelf, ca. 385 km W of McMurdo Station GoogleMaps , USNS Eltanin Cr. 32, Sta. 2060, 25 Jan 1968 , 77.98°S, 178.18°E, Camera grab, 647 m (1, USNM 1490734 About USNM ) GoogleMaps .

Description. A small species, specimen from USNS Eltanin Sta. 1089 (USNM 1013943) 6 mm long and 5.2 mm wide for 48 setigerous segments; types smaller, up to 4.2 mm long for 30 segments. Body distinctly fusiform in shape in types ( Fig 36A View FIGURE 36 ) and some non-types; juveniles more elongate, thick, tapering posteriorly, thickened in middle, but not distinctly fusiform. Individual segments biannulate ( Fig. 36B View FIGURE 36 ). Shallow mid-dorsal groove apparent in some specimens ( Fig. 36A View FIGURE 36 ). Color tan, with no additional pigmentation.

Prostomium broadly rounded on anterior margin, subtriangular in shape, wider than long ( Fig. 36 View FIGURE 36 A–B). Peristomium well developed, dorsally overlapping first segment somewhat, with deep lateral grooves forming

three weakly developed annular rings, well developed laterally ( Fig. 36B View FIGURE 36 ); dorsum of peristomium relatively smooth, without dorsal crest ( Fig. 36A View FIGURE 36 ). Dorsal tentacles medial in location, arising from groove between peristomium and setiger 1 ( Fig. 36 View FIGURE 36 A–B) or anterior margin of first setiger; tentacles thick, short in preservation. First pair of branchiae arising lateral to dorsal tentacles in same groove between peristomium and setiger 1 ( Fig. 36 View FIGURE 36 A–B); subsequent branchiae arising dorsal to setal fascicles ( Fig. 36B View FIGURE 36 ), continuing through first half of body.

Capillary setae in noto- and neuropodia throughout; acicular spines in notopodia from middle and posterior setigers and in neuropodia from setiger 1–5. Acicular spines short, straight ( Fig. 36 View FIGURE 36 D–E); capillaries sometimes with finely serrated or fringed border ( Fig. 36E View FIGURE 36 , inset).

Pygidium terminating a conical lobe ventral to anal opening ( Fig. 36A View FIGURE 36 ).

Methyl Green stain. The prostomium stains lightly; the peristomium stains heavily, especially on the sides; the body segments are generally unstained.

Remarks. Chaetocirratulus pinguis is similar to C. andersenensis in that most specimens have a robust, fusiform body. The two species differ in that the first has acicular spines present in the neuropodia from anterior setigers 1–5 instead of a far posterior setiger. Chaetocirratulus andersenensis has acicular spines limited to a few posterior neuropodia, rarely in notopodia; whereas in A. pinguis , acicular spines are present in both noto- and neuropodia throughout. In addition, the three peristomial rings are typically prominent and well-defined in C. andersenensis , but only weakly developed in C. pinguis , giving the pre-setigerous region a smooth appearance.

Habitat. Chaetocirratulus pinguis was noticeably abundant in the vicinity of the former Larsen Ice Shelf A where the surficial sediments (0–5 cm) consist of 0–40% sand likely derived from the formerly overlying ice cover ( Gilbert & Domack 2003).

Distribution. Weddell Sea and Antarctic Peninsula in shelf and upper slope depths, 317–865 m; East Antarctica, 203 m.

USCG

Universidad de San Carlos de Guatemala

SM

Sarawak Museum

Kingdom

Animalia

Phylum

Annelida

Class

Polychaeta

Order

Terebellida

Family

Cirratulidae

Genus

Chaetocirratulus

Loc

Chaetocirratulus pinguis Hartman, 1978

Blake, James A. 2018
2018
Loc

Chaetozone pinguis

Usha, V. P. & Abdul, J. K. U. & Sanjeevan, V. N. & Antony, P. J. & Elizabeth, J. 2014: 917
2014
Loc

Cirratulus patagonicus:

Hartman, O. 1978: 166
1978
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