Caira J N, Jensen K, Fyler C A
Department of Ecology and Evolutionary Biology, 75 N. Eagleville Road, Unit 3043, University of Connecticut, Storrs, Connecticut 06269-3043.
J Parasitol. 2018 Apr;104(2):133-144. doi: 10.1645/17-165. Epub 2018 Jan 19.
Collections from the dwarf sawfish, Pristis clavata, near Darwin, Australia, in 1997 led to the discovery of the new onchoproteocephalidean genus Matticestus n. gen.-a taxon that has been referred to in molecular phylogenetic analyses in which it has been included as "New genus 8." Its type species, Matticestus anneae n. gen., n. sp., and a second species, Matticestus kathleenae n. sp., are described. Placement of this taxon in the Onchoproteocephalidea is supported morphologically in that both species bear a scolex with 4 bothridia each with a pair of bi-pronged hooks and spinitriches that extend throughout the length of the body. Sequence data for the D1-D3 region of the 28S rDNA gene also place the genus solidly among the other elasmobranch-hosted members of the order. The new genus differs from the other elasmobranch-hosted genera in the order in that its members possess a combination of biloculated bothridia with lateral lappets on the posterior margin of the anterior loculus and a pair of bi-pronged hooks with a distinctive configuration of tubercles and internal channels. Its members are also extremely small. In summary, Matticestus n. gen. is an unusually tiny, "spiny," genus of cestode that seems to exclusively parasitize sawfish of the genus Pristis.
1997年在澳大利亚达尔文附近采集到侏儒锯鳐（Pristis clavata）样本后，发现了新的盘首绦虫属——马蒂绦虫属（Matticestus）。在分子系统发育分析中，该分类单元被称为“新属8”。文中描述了其模式种安妮马蒂绦虫（Matticestus anneae）和另一个物种凯瑟琳马蒂绦虫（Matticestus kathleenae）。该分类单元在盘首绦虫目中的分类地位在形态学上得到了支持，因为这两个物种都有一个头节，每个头节有4个吸槽，每个吸槽有一对双叉钩和遍布全身的棘。28S rDNA基因D1 - D3区域的序列数据也将该属稳固地置于该目其他以软骨鱼类为宿主的成员之中。该新属与该目中其他以软骨鱼类为宿主的属的不同之处在于，其成员具有以下特征组合：双叶吸槽，在前叶后缘有侧叶，以及一对具有独特瘤和内部通道结构的双叉钩。其成员也非常小。总之，马蒂绦虫属是一种异常微小的、“多刺”的绦虫属，似乎专门寄生于锯鳐属的锯鳐。
