Back
Membranilarnacia marina
From Fensome et al., 2019:
Membranilarnacia? marina (Kufferath, 1950, p.34; text-fig.40) Downie and Sarjeant, 1965, p.129. Holotype: Kufferath, 1950, textfig. 40. Originally Membranilarnax, subsequently (and now) Membranilarnacia?. Questionable assignment: Downie and Sarjeant (1965, p.129); and Lachkar and Masure in Fauconnier and Masure (2004, p.389) as a problematic species. Age: Holocene.
---------------------------------------------------------------------------------------------------
Original description (Kufferath, 1950):
Membranilarnax marinum n. sp. (Fig. 40.)
We have little hesitation in provisionally placing the form found in specimen 1005, taken off Orfordness, in the genus established by O. WETZEL (1933) and in which G. DEFLANDRE (1937) described M. ovultim observed in a Bajocian flint from Calvados. Figure A shows a cyst or organ of resistance consisting of a dark elliptical central mass (egg) surrounded by a thick, double-contoured membrane and enveloped by large, colorless polyhedral cells. This cyst is round and somewhat flattened in cross-section (fig. C) and broadly elliptical (fig. B) when viewed from the side. This is, in all probability, an animal element. Let us point out, for example, that M. D. BOGICK (1913) described statoblasts of freshwater Bryozoa, which bear a certain resemblance to the cysts we found. H. LOHMANN (1910) reported these forms (Fig. 18) as coastal in the North Sea and northwest of Scotland, and they contained an embryo. He named them "Umrindete Cyst" after HENSEN, but did not comment on their probable nature.
Dimensions: Fig. A, total length 140 µm, width 80 µm, internal cyst: length 95 µm, width 38 µm.
Membranilarnacia? marina (Kufferath, 1950, p.34; text-fig.40) Downie and Sarjeant, 1965, p.129. Holotype: Kufferath, 1950, textfig. 40. Originally Membranilarnax, subsequently (and now) Membranilarnacia?. Questionable assignment: Downie and Sarjeant (1965, p.129); and Lachkar and Masure in Fauconnier and Masure (2004, p.389) as a problematic species. Age: Holocene.
---------------------------------------------------------------------------------------------------
Original description (Kufferath, 1950):
Membranilarnax marinum n. sp. (Fig. 40.)
We have little hesitation in provisionally placing the form found in specimen 1005, taken off Orfordness, in the genus established by O. WETZEL (1933) and in which G. DEFLANDRE (1937) described M. ovultim observed in a Bajocian flint from Calvados. Figure A shows a cyst or organ of resistance consisting of a dark elliptical central mass (egg) surrounded by a thick, double-contoured membrane and enveloped by large, colorless polyhedral cells. This cyst is round and somewhat flattened in cross-section (fig. C) and broadly elliptical (fig. B) when viewed from the side. This is, in all probability, an animal element. Let us point out, for example, that M. D. BOGICK (1913) described statoblasts of freshwater Bryozoa, which bear a certain resemblance to the cysts we found. H. LOHMANN (1910) reported these forms (Fig. 18) as coastal in the North Sea and northwest of Scotland, and they contained an embryo. He named them "Umrindete Cyst" after HENSEN, but did not comment on their probable nature.
Dimensions: Fig. A, total length 140 µm, width 80 µm, internal cyst: length 95 µm, width 38 µm.