Legend
  • Contains description
  • Contains photos

Classification


USNM 46974.78284

Geographic Distribution

Antarctic Convergence illustration Antarctic convergence

Bathymetric Specimen Dispersal

12 individual specimens found for Pseudoscalibregma bransfieldia.

Pseudoscalibregma bransfieldia (Hartman, 1967)  Species

Original Description
Inactive node Show the full description

Original Description
Active node Hide the full description

Pseudoscalibregma bransfieldia (Hartman, 1967)
n. comb.
Figs. 28a-28c

Eusclerocheilus bransfieldia Hartman, 1967 p. 130.

Material. Weddell Sea, in 412-659 m: Station 69­2 (1 specimen); 68-8 (8 specimens); 69-10 (1 speci­men).

Description. An individual from station 69-8 (USNM 46974) measures 10-14 mm long and 3.32 mm wide and consists of an achaetous peristomium with 14 thoracic and 16 abdominal setigers and 1 posterior asetigerous segment. The body is widest at setigers 6-7 and tapers to a slender posterior end. The epithelium of the first 1-5 setigers is smooth; thereafter, through setigers 6-14 it is gradually areolated, and in the abdominal region it is biannu­lated. The pygidium is a plain ring.

The prostomium diverges anteriorly as a pair of frontal antennae (Figure 28a); a flat semicircular crest occupies the postmedian space between a pair of nuchal organs. The oral aperture is a broadly expanded triangular ventral area between the prostomium and peristomium that extends posteriorly as an oral field to setiger 2.

Thoracic segments have biramous fascicles of long slender capillary setae accompanied by one or more furcate setae in each ramus. Notopodia and neuropodia have broad flat lobes located above and below the emerging setae. A conspicuous oval inter­ramal papilla is located between the rami on the posterior face (Figure 28b). Each ramus is supported by 2-3 pale embedded acicula extending to the longest part of the acicular lobe. Setae are numerous, long, slender, and capillary, accompanied by 8-10 much shorter furcate setae; each furca has unequally long tines (Figure 28c).

Remarks. Pseudoscalibregma bransfieldia differs from P. parvum (Hansen) from the North Sea. The first has an anterior region of 14 setigers and the second, one of 10-12 setigers. The first has a prostomium with a crest; the crest is absent from the second. There are 31 segments in the first and 36 in the second.”

(Hartman, 1978)

Remarks

Pseudoscalibregma bransfieldia differs from P. parvum (Hansen) from the North Sea. The first has an anterior region of 14 setigers and the second, one of 10-12 setigers. The first has a prostomium with a crest; the crest is absent from the second. There are 31 segments in the first and 36 in the second.

Members

Specimens

Type Status Catalog No. Date Collected Location Coordinates Depth (m) Vessel
Holotype 55552 3/14/1964 Antarctic Ocean 61.73° S, 55.93° W 769 Eltanin R/V
  46973 2/25/1969 Antarctic Ocean 75.52° S, 30.13° W 412 Glacier R/V
  46974 Images Available 3/2/1969 Weddell Sea 77.6° S, 42.5° W 585 Glacier R/V
  46975 Images Available 3/4/1969 Weddell Sea 77.8° S, 42.09° W 659 Glacier R/V
  60581 Images Available 1/22/1968 Ross Sea 77.1° S, 168.3° E 916 Eltanin R/V

View additional taxa  View all species collected at same locations as Pseudoscalibregma bransfieldia