Pomerantsoceras, Kroger, 2007
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publication ID |
https://doi.org/ 10.4202/app.2008.0062 |
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persistent identifier |
https://treatment.plazi.org/id/E16287E8-7115-7E3E-FCED-FA35FACDD78D |
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treatment provided by |
Felipe |
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scientific name |
Pomerantsoceras |
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The colour pattern was observed in four specimens which are described separately bellow. The colour pattern is preserved as dark grey or brownish zones on the light−grey re−crystallised shell.
Pomerantsoceras pollux, CGU SM 319, Praha−Butovice, Kační Quarry.—An almost complete specimen but without the dorsal and apical parts of the phragmocone ( Figs. 4 View Fig , 8A View Fig ). Total shell length is 37 mm, the body chamber is 18 mm long and has a maximum width of 8.5 mm. Shell wall is preserved on the right side of the body chamber and phragmocone and especially on the left side (part of the phragmocone). The colour pattern is well visible on the right flank; on the left it is poorly preserved only on the phragmocone. It is bilaterally symmetrical and consists of six longitudinal colour bands. These colour bands occur on the lateral sides and are separated by a narrower zone without colour pigment. The maximal width of colour bands near the aperture is about 3 mm with a maximum distance of about 2 mm on the flanks and the ventral and dorsal un−pigmented zones are about 1.3 mm wide.
Pomerantsoceras pollux, CGU SM 322, Praha−Lochkov, Nad ubikacemi Section.—Incomplete specimen ( Figs. 5 View Fig , 8B View Fig ) with body chamber with an adjacent part of phragmocone. The shell wall is entirely preserved. Maximum length is 13 mm; the shell height increases from 5 mm to 7 mm. Colour patterning is preserved on the entire circumference of the shell. It consists of four broad colour bands—two lateral and one ventral and dorsal. The colour pattern is bilaterally symmetrical. Width of colour bands increases from 3 to 4 mm. Maximum distance of the lateral colour bands from ventral bands is 1.4 mm and from dorsal bands about 1.8 mm.
Pomerantsoceras pollux, CGU SM 323, Praha−Lochkov, Nad ubikacemi Section.—This fragmentary specimen consists of the body chamber and isolated part of the crushed phragmocone (apical end, few of the youngest septa, part of the venter) ( Figs. 6 View Fig , 8C View Fig ). Traces of the colour pattern are preserved across whole shell except for a small area on right side of the body chamber. Maximum shell length is 27.5 mm; the height increases from 2 mm up to 6 mm. The colour pattern consists of six bands of almost equal width, three at each lateral side. Width of each band increases from 0.2 to c. 3 mm. Colour bands are separated by slightly narrower zones without pigmentation.
Pomerantsoceras pollux, CGU SM 321, Praha−Lochkov, Nad ubikacemi Section.—Studied specimen consists of body chamber with a part of phragmocone ( Figs. 7 View Fig , 8D View Fig ). Shell length reaches 20 mm, height increases from 4.5 mm up to 6.5 mm, the body chamber length is 12 mm. Shell is preserved on the left side and particularly also on the right side. Colour pattern is present on the entire circumference of the shell. It consists of three pairs of colour bands which are all about 1.8 mm wide and separated by un−pigmented areas about 2 mm wide on the flanks and about 1.3 mm on venter and dorsum.
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