CATALOG OF ORIGINAL DESCRIPTIONS: Heterohelix varsoviensis Gawor-Biedowa 1992

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> H -> Heterohelix -> Heterohelix varsoviensis
Other pages this level: H. (Chiloguembelina) pseudotessera directa, H. (Heterohelix) planeobtusa, H. dentata, H. fayose, H. ivandeklaszi, H. labellosa, H. navarroensis, H. nkporoensis, H. olssoni, H. orientalis, H. pachymarginata, H. pseudoglobulosa, H. pseudoreussi, H. robusta, H. rumseyensis, H. sphenoides, H. stenopos, H. striata aegyptiaca, H. suwalkensis, H. varsoviensis, H. virgata, H. vistulaensis

Heterohelix varsoviensis

Citation: Heterohelix varsoviensis Gawor-Biedowa 1992
Rank: Species
Type locality: Jeleniowo I{V borehole, at a depth of 276,1 m.
Type age (chronostrat): Maastrichtian
Type specimens: Holotype: specimen IG No. 45946{88{F, in pI. 10: II a, b. Paratype IG Nos. 45947{88{F, 45948{88{F, in pI. 10: 13, 13.

Current identification:


Original Description
Diagnosis. Test very small, elongated, very narrow and hardly increasing in size at the bottom, and rapidly increasing in size at the height oftwo youngest chamber pairs. Test outline smooth in a proximal part, poorly lobate in a distal part. The surface covered with fine, discontinous costae. Aperture semilunar and high.

Description. to 1/3 the total length, at the height of two pairs of the youngest chambers rapidly increasing in size, composed of 7 pairs of chambers. Test surface finely perforated covered with fine discontinous costae; test outline smooth in a proximal part and slightly lobate in a distal one. In the initial part of the test, chambers are very small, rectangular in outline with flat surface and tightly packed, slightly wider than high, separated by straight, translucent, flat sutures which are nearly perpendicular to the vertical axis of the test. The youngest chambers nearly hemispherical, separated by slightly diagonal and strongly depressed sutures. Zig-zag median suture, is flat in a proximal part of the test and slightly depressed in a distal one. Aperture semilunar, situated at the base of apertural surface of the ultimate chamber.

Size: holotype length 0.24 mm

Etymology: after Poland's capital.

Extra details from original publication
Variability. - It is expressed in a number of chambers (6 to 8 pairs, usually 7), in a number of chamber pairs which increase in size (usually 3, sometime 4 pairs), in a test outline and a degree of chamber convexity (quadrangular or hemispherical, the two youngest chambers are always hemispherical). The initial part of the test is slightly wider in the macrospheric forms A than in microspheric forms B. It is also rounded and not pointed.

Remarks, - The species under discussion, in small size, tightly packed chambers which are poorly convex in the initial part of the test, resembles H. washitensis (TAPPAN). It differs, however, from it in having the youngest chambers hemispherical, in increasing in size at the height of two pairs of the youngest chambers, in smooth outline of the proximal portion of the test and lobate outline in a distal one, and in the semilunar aperture.

Distribution. - Poland - Maastrichtian.

References:

Gawor-Biedowa, E. (1992). . -. gs


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Heterohelix varsoviensis compiled by the pforams@mikrotax project team viewed: 16-4-2021

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