. Bulletin of the British Museum (Natural History) Geology Supplement. MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS Genus PROLIXOSPHAERIDIUM nov. 171 -with Derivation of name. Latin, prolixus, stretched out long ; sphaera ball- reference to the shape of the central body. Diagnosis. Shell shape elongate ovoidal to ellipsoidal, one pole (apical) typically lost in archaeopyle formation. Opposite pole occupied by one or two antapical processes. Remaining processes arranged in distinct rows encircling test ; these rows slightly offset at a position corresponding to sulcus. Number of processes exceed
. Bulletin of the British Museum (Natural History) Geology Supplement. MESOZOIC AND CAINOZOIC DINOFLAGELLATE CYSTS Genus PROLIXOSPHAERIDIUM nov. 171 -with Derivation of name. Latin, prolixus, stretched out long ; sphaera ball- reference to the shape of the central body. Diagnosis. Shell shape elongate ovoidal to ellipsoidal, one pole (apical) typically lost in archaeopyle formation. Opposite pole occupied by one or two antapical processes. Remaining processes arranged in distinct rows encircling test ; these rows slightly offset at a position corresponding to sulcus. Number of processes exceeding 30. Processes closed proximally, closed or open distally : their distal terminations simple ; flaring in varied fashion ; or briefly furcate. Shell surface bearing cover of coarse granules or very short, simple spinelets, or lacking such ornamentation. Type species. Prolixosphaeridium deirense, sp. nov. Lower Cretaceous (Middle Barremian) ; England. Remarks. A group of Mesozoic dinoflagellate cysts exhibit an elongate central body with a terminal archaeopyle. Their distinctive character and unity of form merits taxomonic recognition at generic level. The arrangement of the processes suggests that they are intratabular, corresponding perhaps to crest nodes, but prolonged study of many individuals would be necessary before this could be confirmed. Prolixosphaeridium deirense sp. PI. 3, fig. 2 ; Text-fig. 45 nov. Derivation of name. Latin, deirense, of Deira, the ancient kingdom occupying what is now East Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original British Museum (Natural History). London : BM(NH)
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