Ventral interior of specimen ZPAL Bp. VII/1119 from outcrop SK-3.

Diagnoza

Maximal width at hinge line; shell outline subrectangular. Five radial ridges on the deltidium; umbonal part of the ventral valve somewhat elevated in respect to the rest of the valve. Ventral valve with a distinct median U-shaped sinus, occupying one fifth of the shell width. Ventral spines symmetrically, obliquely inserted on the margin of the interarea. Ornamentation of low rounded costae, originating less than 1 mm from the umbo, 5--7 per mm, separated by furrows of approximately the same width (sometimes narrower or broader). In dorsal interior cardinal process strong, with deep median incision and shallower lateral ones, with five radial crests; muscle areas deep.

Porównanie

'Dagnachonetes cf. supragibbosus' (Schemm-Gregory & Jansen, 2005)  from the Late Givetian of western Sahara are much more flattened. Dagnachonetes cf. supragibbosus sensu Racheboeuf, 1981, from the Portilla Fm. of Asturias has length to thickness ratio 2.9-3.9 (1.7-2.3 in the Polish material).

Autekologia

Występowanie geograficzne

Skały (outcrop SK-3), Poland.

Zasięg czasowy

Mid Devonian, Late Eifelian.

Materiały muzealne

8 articulated shells (ZPAL Bp VII/1120-22, 1135, 1142, GIUS 4-2239 Ska/XIV/5/5, GIUS 4-2239 Ska/XIV /4/3), 1 ventral (ZPAL Bp VII/1119) and 1 dorsal valve (ZPAL Bp VII/1122).

Literatura

Biernat, G. 1966. Middle Devonian Brachiopods from the Bodzentyn Syncline (Holy Cross Mountains, Poland). Palaeontologica Polonica 17: 1-162. Plates 1-32; Warszawa.

Gurich, G. 1896. Das Palaeozoicum im polnischen Mittelgebirge.- Verh. Russ.-Kais. Min. Ges. St.-Petersb. (2) 32: 1-539, Plates 1-15, map; St-Petersburg.

Halamski, A.T. 2009. Middle Devonian Brachiopods from the northern Part of the Holy Cross Mountains, Poland in relation to selected coeval faunas. Part One: Introduction, Lingulida, Craniida, Strophomenida, Productida, Protorthida, Orthida. Palaeontographica Abteilung A, 287: 41-98.

Racheboeuf, P. 1981. Chonetaces (Brachiopodes) siluriens et devoniens du Sud-Ouest de l'Europe (Systematique - Phylogenie - Biostratigraphie- Paleobiogeographie). Mem. Soc. geol. mineral. Bretagne 27: 1-294, Plates 1-35; Rennes.

Schemm-Gregory, M. & Jansen U. 2005. Middle and Upper Devonian Brachiopods from the Western Sahara (Morocco). In: Harper, D.A.T., Long, S.L. & McCorry, M. (ed.): Fifth International Brachiopod Congress: Abstracts. p. 27; Copenhagen.

Sobolew, D. 1904a. Devonskia otlozenia profila Grzegorzevice-Skaly-Vloxi. Izv. Varsav. Politex. Inst. 1904: 1-107, Plates 1-9, map; Varsava.