Genus Certesella Loeblich & Tappan, 1961
Diagnosis: Test pyriform elongated or flask shaped. The development of the neck varies among species from slightly to well differentiated. The main characteristics of the genus are the presence of two lateral depressions with large central pores connected by two tubes located at approximately 2/3 of the distance between the fundus of the test and the pseudostome, and the presence of internal teeth on the neck giving punctuated impression.
Type species: Certesella martiali (Certes, 1889)
- C. australis Vucetich 1973
- C. certesi Penard, (1911)
- C. martiali (Certes, 1889)
- C. murrayi (Wailes, 1913)
Ecology: Sphagnum. Restricted to the southern hemisphere.
Key to the species:
|1||Test without distinct neck, the main body tapering gradually toward the aperture, one sole line of the teeth situated parallel to the rim of the aperture. Lateral keel present. Largest species in the genus. L 199-277 μm, B 119-140 μm)||C. australis|
|-||Neck short subcylindrical, sharply differentiated from the rest of test. Internal teeth scattered with no apparent organisation (L 120-136 μm, B 95-100 μm)||2|
|2||Test gradually tapering from the front pores toward the aperture||C. murrayi|
|-||Internal teeth separated arranges into two groups separated by a longitudinal ridge. Narrow lateral keel present (L 80-157 μm, B 70-90 μm)||3|
|3||Neck somehow swollen at the base, tapering from its junction with the body towards the aperture, L 130-170 μm, B 55-103 μm||C. certesi|
|-||Internal teeth separate in two groups by a smooth area without longitudinal ridge. Lateral keel absent. L 147-238 μm, B 77-130 μm||C. martiali|
Key from Kosakyan, A.