Valve elliptical-lanceolate, inflated in the middle, with produced sub-capitate or rostrate ends separated by diaphragms.
rostrate, bearing a beak (Rostrum) or a prolonged appendage.
Valve lanceolate, with produced or rostrate apices; pseudo-nodule wide, excentric.
Promuscis: an extended mouth structure: has been applied to the long tongue of bees and to the rostrate structure in Hemiptera.
Valves oblong-lanceolate, with rostrate ends, sometimes slightly constricted in the middle.
rostrate: the head, when it has a long protraction bearing the mouth parts.
Valve linear with rostrate apices; cost robust; stri delicate, 20 in 10 .
Valve lanceolate, rostrate; granules in longitudinal and nearly transverse, not radiating, lines.
Valve lanceolate, with rostrate or capitate ends; stauros in some cases does not reach the margin.
rostrate ros·trate (rŏs'trāt', -trĭt)
Having a beaklike part.