Margachitininae PARIS , 1981

Morávek, Radek, 2009, Lower Wenlock Chitinozoa From The Bykoš Locality (Silurian, Prague Basin, Barrandian Area, Czech Republic), Acta Musei Nationalis Pragae Series B 65 (1 - 2), pp. 37-60 : 39

Subfamily Margachitininae PARIS, 1981

Genus Linochitina EISENACK, 1968 restrict. PARIS, 1981 Type species: Desmochitina erratica EISENACK, 1931

Linochitina odiosa LAUFELD, 1974

Pl. 3, figs. 1-6; pl. 7, figs. 14-17.

1974 Linochitina odiosa LAUFELD, p. 100-102, figs. 61A-C.

1990 Linochitina cf. odiosa LAUFELD, Dufka, p. 58-59, pl. 41, figs. 1-5.

2004 Linochitina odiosa LAUFELD, Mullins et Aldridge, pl. 5, figs. 15-17.

D e s c r i p t i o n: Vesicles are tubular to conical. The basal edge is rounded and the base is extremely convex. Flanks are straight to convex. Shoulders and flexure were not developed. Twins are very common. A cingulum is not visible.

D i s c u s s i o n: Linochitina odiosa is very similar to the Cingulochitina angusta. It differs by not having a welldeveloped cingulum. The absence of cingulum is verified by SEM observation. In comparision with data obtained by Dufka (1990), L. odiosa from the Bykoš locality are narrower. The length is the same. Vesicles are longer than those of specimens originating from Gotland (cf. Laufeld, 1974). In comparision with the L. odiosa from Gotland ( Laufeld, 1974) the neck flares less.

O c c u r r e n c e: Lower Silurian of the Prague Basin ( Dufka, 1990): Homerian (zone: C. lundgreni). Hughley Brook section, Hughley, Shropshire (GSSP for base of the Wenlock; Mullins et Aldridge, 2004), UK: samples 25/44 and 25/45 from this section.

Gotland ( Laufeld, 1974): From the Conchidium tenuistriatum Beds through Slite Beds to the Mulde Beds (Midlle Sheinwoodian to the upper Homerian).