Pseudoscalibregma bransfieldium (Hartman 1967) Hartman 1967
- Dataset
- 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 Oligobregma
- Rank
- SPECIES
Classification
- kingdom
- Animalia
- phylum
- Annelida
- class
- Polychaeta
- family
- Scalibregmatidae
- genus
- Pseudoscalibregma
- species
- Pseudoscalibregma bransfieldium
discussion
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
Distribution. Widespread in Antarctic seas 332 ‒ 916 m.
materials_examined
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- 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. 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. 6 F) anterior to capillaries, the homologues of lyrate setae now known to occur on numerous species of Scalibregmatidae.