The Echinoid Directory

Hagenowia Duncan, 1889, p. 210

[=Hagenovia Gregory, 1900, p. 321 (nomen null.);=Martinosigra Nielsen, 1942, p. 163 (objective) ]

Diagnostic Features	Test bottle-shaped, with pronounced apical rostrum. Sharp anterior sulcus runs from apex to peristome forming a groove along the rostrum. Apical disc disjunct, with anterior ocular and genital plates at apex of rostrum and posterior oculars at base of rostrum. Anterior genital plates fused. Paired ambulacra flush, with rudimentary pores or pore-pairs only. Posterior column of plates in anterior paired ambulacra often reduced or completely missing. Plastron uniserial, with plates 5b2, 5a2 uniserially arranged following the labrum. Subsequent plates biserial. Plastron plating disjunct, with labral plate separated from first sternal plate by ambulacral plates. Periproct supramarginal. Enlarged primary tubercles at apex of rostrum. Marginal fasciole present.
Distribution	Upper Cretaceous (Coniacian to Maastrichtian); western Europe.
Name gender	feminine
Type	Cardiaster rostratus Forbes, 1852, explanation of pl. 10, p. 3, by original designation.
Species Included	H. rostrata (Forbes, 1852); Upper Coniacian to Santonian, western Europe. H. infulasteroides Wright & Wright, 1949; Santonian, western Europe. H. anterior Ernst & Schulz, 1971; Santonian and Lower Campanian, western Europe. H. blackmorei Wright & Wright, 1949; Campanian, UK. H. elongata Nielsen, 1942; Maastrichtian, Denmark, North Germany.
Classification and/or Status	Holasteroida, Cardiasteridae. Monophyletic.
Remarks	A detailed account of the group and its possible mode of life is given by Gale & Smith (1982). No other echinoid can be mistaken for this taxon. The Recent Echinosigra, though vaguely similar in overall shape, has a subanal fasciole and orthosternous plastron. Duncan, P. M. 1889. A revision of the genera and great groups of the Echinoidea. Zoological Journal of the Linnean Society, 23, 1-311. Smith, A. B. & Wright, C. W. 2003. British Cretaceous echinoids. Part 7, Atelostomata, 1. Holasteroida. Palaeontographical Society Monographs, London. Pp. 440-568, pls 139-182. Gale, A. S. & Smith, A. B. 1982. The palaeobiology of the Cretaceous irregular echinoids Infulaster and Hagenowia. Palaeontology 25, 11-42.