Pseudoscalibregma bransfieldium ( Hartman, 1967 )

Blake, James A., 2015, New species of Scalibregmatidae (Annelida, Polychaeta) from the East Antarctic Peninsula including a description of the ecology and post-larval development of species of Scalibregma and Oligob, Zootaxa 4033 (1), pp. 57-93: 79

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Pseudoscalibregma bransfieldium ( Hartman, 1967 )


Pseudoscalibregma bransfieldium ( Hartman, 1967) 

Figure 6View FIGURE 6 F‒ G

Eusclerocheilus bransfieldia Hartman, 1967: 130  ‒131, pl. 39

Hyboscolex bransfieldia: Kudenov & Blake, 1978: 440  .

Pseudoscalibregma bransfieldia: Hartman, 1978: 180  ‒181, fig. 28

Pseudoscalibregma bransfieldium: Blake, 1981: 1143  ‒1145, fig. 6; Hartmann-Schröder & Rosenfeldt, 1991: 75.

Material examined. East Antarctic Peninsula, RVIB Nathaniel B. Palmer Cruise 2000 -03, Collector, J.A. Blake. —Larsen-A Ice Shelf Area, transect along border with Larsen B, Sta. NBP- 10, 332 m, 1 specimen ( LACM- AHFAbout AHF Poly 7010).

Additions to description. Single specimen complete, 10 mm long, 3 mm wide with 22 setigers; the body more maggot-shaped than arenicoliform. In alcohol, color light tan with no body pigment.

Prostomium bears two long frontal horns projecting anterolateral; dorsal surface of prostomium somewhat domed or elevated, clearly visible; eyes absent; nuchal organs not apparent. Peristomium a single dorsal ring surrounding the prostomium dorsally; ventrally forming upper and lower lips of mouth with upper lip relatively smooth and lower lip with three weakly developed lobes. A weakly developed ventral groove apparent along body from setiger 4; initially, groove formed by a single large segmental annulus that at the mid-point produces a notch between segments; in last 5‒6 segments, a distinct furrow develops at segmental mid-point. The pygidium damaged, but bears five anal cirri.

Anterior parapodia weakly developed with low noto- and neuropodia; posteriorly podial lobes elongate, apically pointed, bearing distinctive dorsal and ventral cirri ( Fig. 6View FIGURE 6 G), both of which are bulbous extensions of the podial lobes; internal glands absent from cirri and elsewhere on body. Interramal papillae weakly developed.

Setae consist of numerous capillaries arranged in 2‒3 rows throughout; lyrate setae from setiger 2; setiger 1 bears an anterior row of short, thin, spinous setae ( Fig. 6View FIGURE 6 F) anterior to capillaries, the homologues of lyrate setae now known to occur on numerous species of Scalibregmatidae  .

Remarks. Pseudoscalibregma bransfieldium  differs from other scalibregmatids by the distinctive dorsal and ventral inflated extensions of the podial lobes. The short anterior spinous setae of setiger 1 are newly reported.

Distribution. Widespread in Antarctic seas 332‒ 916 m.


Allan Hancock Foundation, University of Southern California












Pseudoscalibregma bransfieldium ( Hartman, 1967 )

Blake, James A. 2015


Pseudoscalibregma bransfieldium:

Hartmann-Schroder 1991: 75Blake 1981: 1143


Eusclerocheilus bransfieldia

Hartman 1967: 130


Hyboscolex bransfieldia:

Kudenov 1978: 440


Pseudoscalibregma bransfieldia:

Hartman 1978: 180