Symmetric Biraphid
Mastogloia
- Valves elliptic to lanceolate, with rounded to capitate ends
- Valvocopula with partecta
- Striae punctate
The valves of Mastogloia are elliptic to elliptic-lanceolate or lanceolate, with rounded to capitate ends. The valvocopula (first girdle band) each possess complex silica chambers, called partecta, that function to secrete strands of mucilage. The raphe is straight or undulate. The axial area is narrow, with a slightly expanded central...