junction line
In the genus Entomoneis, the keel joins with the valve forming a line, termed the junction line. The junction line forms straight or irregular contours and may be variously ornamented.
Alternative Term
separation line
Hustedt (1930) used the term, Trennungslinie, or separation line to indicate the same structure.
Citations
Cleve, P.T. (1894). Synopsis of the Naviculoid Diatoms, Part I. Kongliga Svenska-Vetenskaps Akademiens Handlingar 26(2):1-194, 5 pls.
Hustedt, F. (1930). Die Kieselalgen Deutschlands, Osterreichs und der Schweiz mit Berucksichtigung der ubrigen Lander Europas sowie der angrenzenden Meersgebiete. In: Dr. L. Rabenhorst's Kryptogamen-Flora von Deutschland, Osterreich und der Schweiz. Leipzig, Akademische Verlagsgesellschaft Geest und Portig K.-G. Vol. 7, Part 3, pp. 557-816.
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.
Image Credit: Loren Bahls
Entomoneis alata, with the arrow indicating the junction line. In this species, the junction line is associated with a series of subequal dots and swellings.
Image Credit: Loren Bahls
Entomoneis ornata, with the arrow indicating the junction. Here the junction line is undulate.