Thalassiosira antiqua

From Frustule

Jump to: navigation, search
SPECIES Thalassiosira antiqua
(Grunow, 1882) Koizumi (1973)

Taxonomic Information

Jr. Synonymy:

  • Thalassiosira antiqua (Grunow) Cleve-Euler, 1951, p. 72, figs. 119x-k; Sheshukova-Poretzkaya, 1967, p. 143, pl. 14, figs. 3a-b; Koizumi, 1973[b], p. 834, pl. 7, fig. 12; Schrader, 1973b, pl. 11, fig. 25; pl. 25, fig. 19; Barron, 1980a, pl. 5, fig. 5; Akiba and Yanagisawa, 1986, p. 498, pl. 51, figs. 1, 2, 4; pl. 52, figs. 1-9; Yanagisawa et al., 1986, pl. 1, figs. 5, 6.


Morphometry:




Species Description:

Original Name Peronia? antiqua Grunow, 1882: Schalen keilförmig, mit abgerundeten Enden, 0.022-0.049 mm lang, 0.0035 bis 0.004 mm breit, mit schmaler Mittellinie und ca. 16-18 matten Querstreifen in 0.01 mm, von denen einzelne etwas stärker markirt sind, so dass manche Schalen ein fast Meridion-artiges Ansehen erhalten. Von Peronia erinacea Brébisson & Arnott ex Kitton (1868, Quarterly Journal of Microscopical Science, London, England, n. s., vol. 8, p. 16) weicht diese interessante Art, die den Uebergang zu Meridion zu vetmitteln scheint, ausserdem durch die kaum sichtbaren Endknoten ab, wodurch sich auch solche Schalen davon unterscheiden lassen, bei denen einzelne Streifen nicht vor den anderen stärker hervortreten. Hin und wieder.
Web translation of Original Description:
Stale wedge-shaped, with rounded ending, 0.022-0.049 mm long, 0.0035 until 0.004 mm wide, with narrow means line and ca. Breadth strip dull 16-18 in 0.01 mm, by which single somewhat stronger mark type are, so that many scarves receive an almost Meridion-good appearance. Of Peronia erinacea Brébisson & Arnott ex Kitton (1868, Quarterly journal of Microscopical Science, London, England, n. s., vol. 8, p. 16) yields this interesting type, that seems the transition to Meridion to vetmitteln, moreover through the hardly visible Endknoten off by what means also such scarves can be distinguished therefrom, with which single strips more strongly do not step forward before the other. There and again.

Modern Description by Akiba and Yanagisawa (1986, p. 498):

The valve is circular in outline; the face is almost flat with a slightly concave center. The mantle is shallow and slanting, ending at an almost horizontal ribbed brim. The diameter of specimens is 17-47 µm. The areolae are basically hexagonal in outline with external circular foramina (Plate 52, Figs. 1-2, 4-5, 9). The internal cribra are circular in outline with fine porelli (Plate 52, Figs. 3, 7-8). The areolae of the valve face are arranged in an eccentric pattern with 6-7 eccentric centers, decreasing slightly in size toward the margin; 5-7 areolae in 10 µm in the center to 6-9 in 10 µm near the mantle. The areolae of mantle are smaller and more irregular in arrangement than those of valve face. The brim, 1.6-1.8 pin wide, is striated or ribbed, 10 ribs in 10 µm. A single labiate process is located somewhat inside the ring of marginal strutted processes (Plate 52, Figs. 1, 3, 5-6, 9). It has a prominent external tube and an internal lipshaped slit oriented radially (Plate 52, Fig. 7). A ring of marginal strutted processes is situated in the mantle, 12 processes in 10 µm (Plate 52, Figs. 1-2). It is interrupted at two points: one at the labiate process and the other 165° apart from the labiate process ("L' and "X" in Plate 52, Figs. 1, 3, 9). Each strutted process has four internal struts and satellite pores (Plate 52, Fig. 7), and a very short external tube, which is often indistinct. A central area consisting of 13-31 strutted processes is surrounded by 6-7 large areolae forming a clear rosette (Plate 52, Figs. 4, 8). Each strutted process of rosette has three struts and satellite pores, and a small outer opening without a tube. Tubular occluded processes form a less regular ring inside the ring of strutted processes (Plate 52, Figs. 2, 5). They are variable in number and in spacing.

Additional Remarks

  • Remarks by Akiba and Yanagisawa (1986):
This species is similar to los-latitude to middle latitude species, Thalassiosira burckliana Schrader (1974, p. 916, pl. 1, figs. 21-16; pl. 51, fig. 3), but is distinguished from it by much larger size relatively smaller central area, regular patterns of areola adn central rosette, and a clearly defined and striated margin. T. burckliana rarely occurs in the Thalassionema schraderi Zone.
  • Remarks by Grunow (1882):
This species is similar to low-latitude to middle-latitude species, Thalassiosira burckliana Schrader (1974a, p. 916, pl. 1, figs. 21-16; pl. 51, fig. 3), but is distinguished from it by much larger size, relatively smaller central area, regular patterns of areolae and central rosette, and a clearly defined and striated margin. T. burckliana rarely occurs in Thalassionema schraderi Zone.


Useful References

  • Akiba, F., and Yanagisawa, Y., 1986. Taxonomy, morphology and phylogeny of the Neogene diatom zonal marker species in the middle-to-high latitudes of the North Pacific. In Kagami, H., Karig, D.E., Coulbourn, W.T., et al., Init. Repts. DSDP, 87: Washington (U.S. Govt. Printing Office), 483-554.
  • Koizumi, I., 1973. The Late Cenozoic diatoms of Sites 183-192, Leg19, Deep Sea Drilling Project. In Creager, J.S., Scholl, D.W. et al. (eds.), Initial Reports of the Deep Sea Drilling Project, 19: Washington (U.S. Government Printing Office), 805- 856.
  • Grunow, A., 1882. Beiträge zur Kenntniss der fossilen Diatomeen Österreich-Ungarns. Beiträge zur Paläontologie Österreich-Ungarns und des Orients, Vienna, Band 2, Heft 4, p. 140.
Retrieved from "http://frustule.jx3.net/index.php/Thalassiosira_antiqua"
Personal tools