Pereira Marcos W O, De Brito Fabiano Carvalho, Eizirik Eduardo, Utz Laura R P
Escola de Ciências, Programa de Pós-Graduação em Zoologia, Pontifícia Universidade Católica do Rio Grande do Sul (PUCRS), Porto Alegre, Brazil.
Zootaxa. 2018 Oct 31;4508(2):211-224. doi: 10.11646/zootaxa.4508.2.4.
The peritrich ciliates Vorticella veloxiiforme n.sp. and Vorticella ampullaria n.sp. were found as epibionts on the ampullarid mollusk Pomacea canaliculata collected from Patos Lagoon, Rio Grande do Sul state, Brazil. The detailed morphology of both species was investigated using live and stained specimens, as well as scanning electron microscopy. Zooids of Vorticella veloxiiforme are cup shaped measuring 57 X 41 μm on average. A J-shaped macronucleus lies in the upper half of the cell. One contractile vacuole was observed in the upper part of the cell. V. ampullaria presents an elongate zooid measuring 70 X 25 µm on average. A C-shaped macronucleus lies in the middle of the cell. Two contractile vacuoles are present: one close to the peristome and the other in the lower half of the cell. The pattern of oral polykinetids was typical of the genus, with all infundibular polykinetids composed by three rows of kinetosomes each. SEM revealed a regular pattern of pores present on the zooid membrane of both species. Analyses of the 18s rDNA placed the two new species in the order Vorticellida close to described species of Vorticella.
在从巴西南里奥格兰德州帕托斯泻湖采集的福寿螺（Pomacea canaliculata）上，发现了周丛生纤毛虫新物种速形钟虫（Vorticella veloxiiforme n.sp.）和壶形钟虫（Vorticella ampullaria n.sp.）作为体表共生生物。使用活体和染色标本以及扫描电子显微镜对这两个物种的详细形态进行了研究。速形钟虫的虫体呈杯状，平均尺寸为57×41微米。一个J形大核位于细胞的上半部分。在细胞上部观察到一个收缩泡。壶形钟虫呈现出细长的虫体，平均尺寸为70×25微米。一个C形大核位于细胞中部。有两个收缩泡：一个靠近口围，另一个在细胞下半部分。口部复纤毛器的模式是该属的典型特征，所有漏斗状复纤毛器均由三排动基体组成。扫描电子显微镜显示这两个物种的虫体膜上存在规则的孔模式。对18s rDNA的分析将这两个新物种置于钟虫目，靠近已描述的钟虫属物种。
