RT Journal Article
SR Electronic
A1 Izabel Tremarin, Priscila
A1 Alvim Veiga Ludwig, Thelma
A1 Torgan, Lezilda Carvalho
T1 Ultrastructure of Aulacoseira brasiliensis sp. nov. (Coscinodiscophyceae) and comparison with related species.
JF Fottea
YR 2012
VO 12
IS 2
SP 171
OP 188
DO 10.5507/fot.2012.013
UL https://fottea.czechphycology.cz/artkey/fot-201202-0002.php
AB This paper describes and illustrates Aulacoseira brasiliensis Tremarin, Torgan et T. Ludwig sp. nov. under light and electron microscopy and compares their ultrastructure with similar species obtained from Hustedt's collection samples. The new species is characterized by forming short chains linked by ovate-attenuate spines, rounded areolae occluded by vola, undeveloped ringleist and sessile rimoportulae arranged in two circumferential alternate rows. The spines shape, rimoportulae disposition, valve surface and mantle areolation pattern are very particular. The ultrastructural features of the frustules of A. brasiliensis are compared with those of A. muzzanensis, A. agassizii var. agassizzi and A. agassizii var. malayensis, particularly with respect to the areolation pattern, position, number and shape of rimoportulae. A. brasiliensis was found in lotic and lentic environments of tropical and subtropical regions from Brazil.