Comprehensive Description

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Description

"Calliotropis (Calliotropis) eltanini n.sp. (Figs 133, 134, 135)

 

MATERIAL EXAMINED: Eltanin Stn 432.

 

DISTRIBUTION: Known only from the type locality, Bransfield Strait, off the South Shetland Islands, 935-884 m.

 

DESCRIPTION: Shell depressed trochoid, whorls strongly carinate, openly umbilicate. Whorls five, including the protoconch, which is eroded. Whorls with a narrow subsutural shoulder demarcated by a slight angulation. Spire whorls carinated by a strongly raised, broad, spiral cord which continues on to the last whorl. A secondary, much weaker cord is developed on the last whorl at the level of the adapical margin of the aperture. Base gently convex, sculptured with six cords, the last margining the umbilicus. All cords crossed by thin, oblique, axial lamellae, sparse on the subsutural shoulder and much more numerous close to, and across the major carina. Suture rather deeply impressed. Umbilicus wide and perspective, rather widely expanded over last half whorl, axial lamellae continuing rather irregularly into the umbilicus. Aperture obliquely compressed, strongly angled by the major carina. Columella slightly convex, oblique, moderately thickened but encroaching only slightly on the widely open umbilicus.

 

MEASUREMENTS: See Table 4.

 

HOLOTYPE: Eltanin Stn 432, in collection of National Museum of Natural History (USNM 860086). [sic - USNM 860085]

 

REMARKS: The presence of a wide, deep and open umbilicus would perhaps place the species in the subgenus Solaricida Dall. However, the form of the sculpture on the shoulder is so like that of the two forms of Calliotropis (s.str.) discussed above and the general shell features so like those of C. pelseneeri rossiana that it seems best placed in Calliotropis (s.str.). The new species shows affinity with C. pelseneeri rossiana in general form, but can be readily distinguished by the much more depressed outline, the slighter development of the second major cord on the last whorl, the much more widely spaced axial lamellae, and the widely open umbilicus."

 

(Dell, 1990: 85)

 

Table 4. Measurements of species of Calliotropis (U = greatest diameter of umbilicus).

                                                                                     
 

 
 

H (mm)

 
 

L (mm)

 
 

U (mm)

 
Calliotropis p. pelseneeri
 

USNM 612941

 
 

11.0

 
 

12.1

 
 

 
 

11.0

 
 

11.7

 
Calliotropis p. rossiana
 

Eltanin Stn 1878 (holotype)

 
 

12.1

 
 

12.5

 
 

“ (paratype)

 
 

10.8

 
 

12.3

 
 

Eltanin Stn 2117 (paratype)

 
 

6.8

 
 

6.8

 
 

NZOI Stn A461 (paratype

 
 

7.2

 
 

8.4

 
Calliotropis eltanini
 

holotype

 
 

11.3

 
 

14.1

 
 

2.0

 
Calliotropis (Solaricida) antarctica
 

holotype

 
 

6.6

 
 

10.4

 
 

4.5

 
 

paratype

 
 

6.0

 
 

10.0

 
 

3.8

 
 

paratype

 
 

5.8

 
 

7.9

 
 

3.0

 
Calliotropis (Solaricida) lateumbilicata
 

holotype

 
 

9.4

 
 

14.2

 
 

6.0

 

Trusted

Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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