Spratt D M
CSIRO Sustainable Ecosystems, GPO Box 284, Canberra 2601, Australia.
Parasite. 2003 Sep;10(3):235-41. doi: 10.1051/parasite/2003103235.
A new cephalobaenid pentastome, Rileyella petauri gen: nov., sp. nov. from the lungs and nasal sinus of the petaurid marsupial, Petaurus breviceps, is described. It is the smallest adult pentastome known to date, represents the first record of a mammal as the definitive host of a cephalobaenid and may represent the only pentastome known to inhabit the lungs of a mammal through all its instars, with the exception of patent females. Adult males, non-gravid females and nymphs moulting to adults occur in the lungs; gravid females occur in the nasal sinus. R. petauri is minute and possesses morphological features primarily of the Cephalobaenida but the glands in the cephalothorax and the morphology of the copulatory spicules are similar to some members of the remaining pentastomid order, the Porocephalida. This unusual combination of features distinguish the new genus from other genera in the Cephalobaenida. The occurrence of only seven fully-formed larvae in eggs in the uterus, each representing about 10% of the length of the patent female, and her presence in the nasal sinus of a dependent juvenile P. breviceps (36 gm) implies a direct life cycle.
描述了一种来自袋鼯有袋动物短头袋鼯（Petaurus breviceps）肺和鼻窦的新的头吻科五口吸虫，即新属短头袋鼯五口吸虫（Rileyella petauri gen: nov., sp. nov.）。它是迄今为止已知最小的成年五口吸虫，代表了哺乳动物作为头吻科终末宿主的首次记录，并且可能是已知除产卵雌虫外所有龄期都寄生于哺乳动物肺部的唯一五口吸虫。成年雄虫、未孕雌虫和正在蜕皮变为成虫的若虫寄生于肺部；孕卵雌虫寄生于鼻窦。短头袋鼯五口吸虫体型微小，具有主要属于头吻科的形态特征，但头胸部的腺体和交配刺的形态与其余五口吸虫目（孔头科）的一些成员相似。这种不寻常的特征组合将新属与头吻科的其他属区分开来。子宫内卵中仅出现七条发育完全的幼虫，每条幼虫约为产卵雌虫长度的10%，并且它存在于一只依赖的幼年短头袋鼯（36克）的鼻窦中，这意味着其生活史为直接型。
