Chaetocirratulus abyssalis, Blake, 2018

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 : 60-62

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.3798594

persistent identifier

https://treatment.plazi.org/id/03A2CB16-FFCE-A277-FF36-F885FC85FEFB

treatment provided by

Plazi

scientific name

Chaetocirratulus abyssalis
status

sp. nov.

Chaetocirratulus abyssalis View in CoL new species

Figure 30 View FIGURE 30

Material Examined. Ross Sea, off Cape Adare, USNS Eltanin Cr. 27, Sta. 1869, 13 Jan 1967, 71.267°S, 171.667°E, trawl, 1565–1674 m, holotype ( USNM 60691 About USNM ) GoogleMaps .

Description. Holotype small, complete, 4 mm long and 0.3 mm wide for 17 setigerous segments. Anterior end narrow, middle body segments inflated, tapering posteriorly to narrow pygidium ( Fig. 30E View FIGURE 30 ). Oocytes present in posterior segments. Color in alcohol: light brown.

Prostomium large, bluntly conical; eyespots lacking; nuchal organs not observed ( Fig. 30A View FIGURE 30 ). Peristomium with two achaetous rings, incomplete dorsally; dorsal tentacles inserted in groove between peristomium and anterior edge of setiger 1 ( Fig. 30A View FIGURE 30 ). A single pair of short branchiae lateral to dorsal tentacles on posterior margin of peristomium ( Fig. 30A View FIGURE 30 ); segmental branchiae, scars, or stubs not observed.

Parapodia reduced, lacking parapodial lobes. Setiger 1 with two setae in noto- and neuropodia: one a simple capillary, the other a narrow curved spine; heavy acicular spines ( Fig. 30 View FIGURE 30 B–C), numbering 3–4 per fascicle present from setiger 2, these sometimes accompanied by 1–2 narrow spines having a fimbriated edge ( Fig. 30D View FIGURE 30 ), and a single long capillary seta. Pygidium a simple flattened lobe ( Fig. 30E View FIGURE 30 ).

Etymology. The epithet is from the Latin, abyss for deep sea.

Remarks. Chaetocirratulus abyssalis n. sp. has acicular spines from setiger 1 in both noto- and neuropodia. In this respect the species approaches C. pinguis , but otherwise differs in body shape and by having up to four spines per neuropodium instead of 1–2.

Distribution. Ross Sea, Antarctica, 1565–1674 m.

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