Zamparo David, Brooks Daniel R, Causey Douglas
Department of Zoology, University of Toronto, Toronto, Ontario M5S 3G5, Canada.
J Parasitol. 2003 Aug;89(4):823-8. doi: 10.1645/GE-3101.
We describe 2 new species of leucochloridiid-like brachylaimoid digeneans parasitizing a variety of birds in the Area de Conservación Guanacaste, Costa Rica, each of which we assign to a new genus. According to Pojmanska's (Pojmanska, T. 2002a. Superfamily Brachylaimoidea Joyeux & Foley, 1930. In Keys to the Trematoda, D. I. Gibson, A. Jones, and R. A. Bray [eds.]. CAB International and The Natural History Museum, London, U.K., p. 31-36.) key for the Brachylaimoidea, we are unable to place either species in any family. One species most closely resembles members of Leucochloridium by having well-developed suckers, lacking an esophagus, and having cecal shoulders, gonads at the posterior end, and the genital pore at posterior end of body but differs by having symmetrical testes, a posttesticular ovary, and a terminal genital pore; thus, we propose the genus Bakkeius for it. The second new genus resembles members of Michajlovia by having ventral genital pores but differs by having extracecal uterine loops in the forebody, a cirrus sac containing the pars prostatica and seminal vesicle, and gland cells surrounding the genital pore; thus, we propose Pojmanskia for it. These new genera must currently be treated as incertae sedis according to Pojmanska (op. cit.); however, we feel that future phylogenetic analyses will require emendation of the family diagnosis for Leucochloridiidae to include those taxa with terminal and ventral genital pores and with preovarian testes.
我们描述了两种新的类白吸虫科短咽类双腔吸虫，它们寄生于哥斯达黎加瓜纳卡斯特自然保护区的多种鸟类体内，我们将每种吸虫都归入一个新属。根据波伊曼斯卡（Pojmanska, T. 2002a. 短咽科（Brachylaimoidea Joyeux & Foley, 1930）。载于《吸虫类检索表》，D. I. 吉布森、A. 琼斯和R. A. 布雷 [编]。英国伦敦，CAB国际与自然历史博物馆，第31 - 36页）对短咽科的检索表，我们无法将这两个物种归入任何一个科。其中一个物种与白吸虫属的成员最为相似，具有发育良好的吸盘，没有食管，有盲肠肩部，后端有性腺，生殖孔位于身体后端，但不同之处在于有对称的睾丸、睾丸后的卵巢和末端生殖孔；因此，我们为其提议了巴凯吸虫属。第二个新属与米哈伊洛夫吸虫属的成员相似，有腹侧生殖孔，但不同之处在于前体有盲肠外子宫袢，有一个包含前列腺部和精囊的阴茎囊，以及围绕生殖孔的腺细胞；因此，我们为其提议了波伊曼斯卡吸虫属。根据波伊曼斯卡（同前引）的说法，目前这些新属必须被视为分类地位不确定；然而，我们认为未来的系统发育分析将需要修订白吸虫科的科诊断，以包括那些具有末端和腹侧生殖孔以及卵巢前睾丸的分类单元。
