Certecella martiali

 

Certesella martiali - after Jung (1942)

 

 

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)

Four species:
- 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 Certesella
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. L. < 140 µm, test in broad view ellipse-shaped with a short straight neck approximately 1/3 of the total length. The lateral pores are located on either side of the base of the neck. L. 120-136 µm, W. 95-100 µm. Sphagnum mosses. Southern hemisphere: South-America (Chile, Brazil). Fig. 10 a & b
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). L. >145 µm, neck either with parallel sides or test pear shaped with convergent sides. Two lateral pores present on the narrow site of the test
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, colorless or light yellow. Sphagnum mosses. Southern hemisphere: South-America (Colombia, Cape Horn), Australia, Islands of the Pacific Ocean. Fig. 10 f–l
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. Straw-yellow color, translucent. Sphagnum mosses. Southern hemisphere: South-America (Colombia, Cape Horn), Australia, New Zealand, Macquarie Islands (Pacific Ocean). Fig. 10 c-e
C. martiali

 

Note. The distinction between C. certesi and C. martiali is not obvious, apart from the size. The descriptions given by Deflandre do not suggest any other clear criterion for separating between these two species.

 

Fig. 10 a, b, Certesella murrayi (after Wailes in Deflandre); c–e, C. martiali (c after Certes, d, e after Penard in Deflandre); f-l C. certesi (f, g after after Penard, h-j after Certes, k, l after Heinis, in Deflandre).

 

Key from Kosakyan and Mitchell