The Biddulphioid diatoms, Biddulphia titiana (Grunow) Grunow in Van Heurck and Trigonium
arcticum (Brightwell) Cleve, have been variously interchanged in the literature. Comparison of their valve and
cingular structure revealed several differences. The valve outline of B. titiana is consistently bipolar whereas
that in T. arcticum may be bi- or tripolar. The marginal septum in B. titiana is entire; the septum in T. arcticum occurs only at the apices. Labiate processes only occur at the apices in B. titiana and only at the valve center in
T. arcticum. Poroid areolae in B. titiana are covered with rota-type vela arranged in a more or less linear pattern in contrast to the loculate areolae in T. arcticum which radiate from the valve center. The cingular suture in B.
titiana is undulate whereas the suture in T. arcticum is straight. It was found to be the most distinctive feature in
B. titiana and was used to formulate the sequence of frustule element development. [Bacillariophyceae, Biddulphiaceae, Biddulphia, diatoms, Eupodiscaceae, Trigonium, ultrastructure, frustule formation]
Member of
Contributors
Publisher
Academy of Natural Sciences of Philadelphia.
Date Issued
1984
Note
Language
Type
Genre
Form
Extent
19 p.
Subject (Topical)
Identifier
FA00007148
Additional Information
The Biddulphioid diatoms, Biddulphia titiana (Grunow) Grunow in Van Heurck and Trigonium
arcticum (Brightwell) Cleve, have been variously interchanged in the literature. Comparison of their valve and
cingular structure revealed several differences. The valve outline of B. titiana is consistently bipolar whereas
that in T. arcticum may be bi- or tripolar. The marginal septum in B. titiana is entire; the septum in T. arcticum occurs only at the apices. Labiate processes only occur at the apices in B. titiana and only at the valve center in
T. arcticum. Poroid areolae in B. titiana are covered with rota-type vela arranged in a more or less linear pattern in contrast to the loculate areolae in T. arcticum which radiate from the valve center. The cingular suture in B.
titiana is undulate whereas the suture in T. arcticum is straight. It was found to be the most distinctive feature in
B. titiana and was used to formulate the sequence of frustule element development. [Bacillariophyceae, Biddulphiaceae, Biddulphia, diatoms, Eupodiscaceae, Trigonium, ultrastructure, frustule formation]
arcticum (Brightwell) Cleve, have been variously interchanged in the literature. Comparison of their valve and
cingular structure revealed several differences. The valve outline of B. titiana is consistently bipolar whereas
that in T. arcticum may be bi- or tripolar. The marginal septum in B. titiana is entire; the septum in T. arcticum occurs only at the apices. Labiate processes only occur at the apices in B. titiana and only at the valve center in
T. arcticum. Poroid areolae in B. titiana are covered with rota-type vela arranged in a more or less linear pattern in contrast to the loculate areolae in T. arcticum which radiate from the valve center. The cingular suture in B.
titiana is undulate whereas the suture in T. arcticum is straight. It was found to be the most distinctive feature in
B. titiana and was used to formulate the sequence of frustule element development. [Bacillariophyceae, Biddulphiaceae, Biddulphia, diatoms, Eupodiscaceae, Trigonium, ultrastructure, frustule formation]
Florida Atlantic University. Harbor Branch Oceanographic Institute contribution 392
This manuscript is an author version
with the final publication available and may be cited as: Gibson, R. A., & Mahoney, R. K. (1984).
Comparative valve and cingular strcture in Biddulphia titiana (Grunow) Grunow in Van Heurck and
Trigonium arcticum (Brightwell) Cleve (Bacillariophyceae). Proceedings of the Academy of Natural
Sciences of Philadelphia, 136, 200-217.
with the final publication available and may be cited as: Gibson, R. A., & Mahoney, R. K. (1984).
Comparative valve and cingular strcture in Biddulphia titiana (Grunow) Grunow in Van Heurck and
Trigonium arcticum (Brightwell) Cleve (Bacillariophyceae). Proceedings of the Academy of Natural
Sciences of Philadelphia, 136, 200-217.
Date Backup
1984
Date Text
1984
Date Issued (EDTF)
1984
Extension
FAU
IID
FA00007148
Organizations
Attributed name: Harbor Branch Oceanographic Institute
Person Preferred Name
Gibson, R. A.
Physical Description
19 p.
Title Plain
Comparative valve and cingular strcture in Biddulphia titiana (Grunow) Grunow in Van Heurck andTrigonium arcticum (Brightwell) Cleve (Bacillariophyceae)
Origin Information
1984
Academy of Natural Sciences of Philadelphia.
Philadelphia, PA
Place
Philadelphia, PA
Title
Comparative valve and cingular strcture in Biddulphia titiana (Grunow) Grunow in Van Heurck andTrigonium arcticum (Brightwell) Cleve (Bacillariophyceae)
Other Title Info
Comparative valve and cingular strcture in Biddulphia titiana (Grunow) Grunow in Van Heurck andTrigonium arcticum (Brightwell) Cleve (Bacillariophyceae)