Hohn and Hellerman 1963 Category: Asymmetrical biraphid
BASIONYM: Gomphonema consector Hohn and Hellerman 1963
Contributor: Loren Bahls - August 2013
Length Range: 16-25 µm
Width Range: 5.3-6.0 µm
Striae in 10 µm: 13-15
Valves are clavate. The headpole is apiculate and the valve margin tapers to the footpole. The widest part of the valve is between the valve center and the headpole. The axial area is narrow and straight. The central area is transverse and rectangular. On one side of the valve, the central area is bounded by a shortened stria bearing an isolated stigma at its end. On the other side of the valve is a much shorter stria. The raphe is filiform and somewhat sinuous. The proximal raphe ends are weakly expanded; distal raphe ends are bent to the same side. Striae are weakly radiate throughout, somewhat curved and composed of areolae that number about 30 in 10 µm. Striae near the central area are somewhat more widely spaced than those closer to the valve apices.
Basionym: Gomphonema consector
Author: Hohn and Hellerman 1963
Length Range: 18.2-30.7 µm
Width Range: 5.2-6.8 µm
Striae in 10 µm: 10-15
Valve clavate, apical and subrostrate, basal end tapering, rounded; length 18.2-30.7 µm, width 5.2-6.8 µm; striae punctate, slightly arcuate, radiate throughout, 10-15/10 µm; axial area linear; raphe thin, straight, terminal ends curved unilaterally, enclosed by striae; two opposing shortened striae form transapical rectangular central area; distinct isolated punctum.
Hohn, M.H. and Hellerman, J. (1963). The taxonomy and structure of diatom populations from three Eastern North American rivers using three sampling methods. Transactions of the American Microscopical Society 82(3):250-329.
Patrick, R.M. and Reimer, C.W. (1975). The Diatoms of the United States, exclusive of Alaska and Hawaii, V. 2. Monographs of the Academy of Natural Sciences of Philadelphia 13.
Gomphonema consector was described from Ridley Creek, Pennsylvania, a low conductivity circumneutral stream (Patrick and Reimer 1975). The specimens shown here are from an alpine lake in the Sierra Nevada Mountains of California (photo below). At this site, G. consector was associated with Eunotia sudetica, Gomphonema exilissimum, and two undescribed species of Gomphonema.
Evolution Lake at an elevation of 3,313 m in the Sierra Nevada Range of central California: home of Gomphonema consector.