The World of Protozoa, Rotifera, Nematoda and Oligochaeta
Stenosemella
Stenosemella Jorgensen, 1924 (ref. ID; 3607)
From Dr. Inaki
Order Heterotrichida Stein, 1867: Suborder Tintinnoinea Kofoid & Campbell, 1929: Family Codonellopsidae Kofoid & Campbell, 1929 (ref. ID; 3607)
[ref. ID; 3596]
Lorica minute, ovoid, consisting of low collar and an ovate bowl; collar short, hyaline, without spiral turns; bowl usually broadest in the anterior region; aboral end acute or rounded; wall of the bowl made of a reticulated structure or covered with agglomerated particles upon the ground structure. (ref. ID; 3596)
Lorica ovate, its length 1.81-2.15 oral diameters, collar low, without windows; bowl expanding upwards to form a shoulder, its greatest transdiameter 1.75-2.00 oral diameters, conical in the lower region; aboral end bluntly pointed; wall of the bowl with coarse agglomerated materials. (ref. ID; 3596)
Comments
The collar in some individuals is very low and scarcely visible. The collar of specimens found in Akkeshi Bay is generally shorter than that of ones from Mutsu Bay. The species differs from S. ventricosa (Claparede & Lachmann) in being smaller in size and from S. oliva (Meunier) in being stouter in form. (ref. ID; 3596)
Measurements
Length 55; breadth 50; oral diameter 25 um. (ref. ID; 3544)
Length 40 (38-43); oral diameter 20 (20-21); greatest transdiameter of the bowl 38 (35-40) um. (ref. ID; 3596)
It was one of the smallest tintinnids present in the estuary, with a length ranging from 35 to 60 um and an oral diameter of ~20 um, ranging from 15 to 25 um. Some individuals had particles attached to the hyaline collar. (ref. ID; 4577)
Lorica ovate; 2.2-2.5 oral diameters in length; collar 0.08-0.10 of the total length, provided with a row of 8-9 arched fenestrae; bowl ellipsoid, 1.7-1.9 total diameters in greatest diameter; aboral end rounded; wall of the bowl coarsely agglomerated. (ref. ID; 3597)
Comments
The species differs from the other species of Stenosemella in having large fenestrae on the collar and from most species of Codonellopsis in possessing a short collar consisting of a row of arched fenestrae without a spiral structure. (ref. ID; 3597)
Length 48-60; oral diameter 19-25; length of the collar 4-6; greatest diameter of the bowl 34-47 um. (ref. ID; 3597)
The lorica is remarkably small and consists of a short hyaline collar with sparse foreign particles and of an ovoid bowl with a somewhat coarse surface. (ref. ID; 3544)
Comments
The new form is different from the known species of Stenosemella in minute size of a lorica. (ref. ID; 3544)
Lorica ovate, 1.7-2.0 oral diameters in length; collar very low, hyaline, without windows; shoulder sloping outwardly; bowl ovoidal, aborally convex conical (95-110 degrees), its greatest transdiameter 1.5-1.7 oral diameter; aboral end more or less blunt; wall coarsely agglomerated. (ref. ID; 3607)
Some individuals of S. ventricosa had an enlargement in the oral region formed by small particles attached to the hyaline collar. (ref. ID; 4577)
S. ventricosa, collected in the neritic waters of the Bay of Villefranche, has an approximately egg-shaped lorica with a hyaline and thin collar (with oral opening). The lorica is devoid of spiral structure and of an aboral horn. Its lorica surface is thickened by the extraneous particles. (ref. ID; 7569)
Comments
Differs from Stenosemella steini (Jorgensen) in its lower collar and in the structure of the shoulder which is square in S. steini, but in this species sloping smoothly with rounded edges. (ref. ID; 3607)
Measurements
Length 84 (80-86); oral diameter 46 (42-49); transdiameter of the bowl 72 (71-75) um. (ref. ID; 3607)
The length of the lorica varied from 75 to 90 um, and the oral diameter was between 32 and 50 um. The mean width of the bowl was 67 um. (ref. ID; 4577)
Dimensions of the cells (after Balech, 1959): length=74-87 um; oral diameter=32.5-36.0 um; maximum diameter=63.0-73.5 um. (ref. ID; 7569)
