Kritsky Delane C, Bullard Stephen A, Bakenhaster Micah D, Scharer Rachel M, Poulakis Gregg R
Health Education Program, School of Health Professions, Campus Box 8090, Idaho State University, Pocatello, Idaho 83209. Correspondence should be sent to Delane C. Kritsky at:
J Parasitol. 2017 Oct;103(5):477-485. doi: 10.1645/17-40. Epub 2017 Jun 7.
Mycteronastes Kearn and Beverley-Burton, 1990 (Monogenoidea: Monocotylidae: Merizocotylinae) was resurrected from subjective synonymy with Merizocotyle Cerfontaine, 1894 , and its diagnosis was emended to include monocotylids with a haptor lacking a central loculus and having 5 peripheral (2 bilateral pairs and an unpaired anteromedial loculus), 1 interhamular, and 17 marginal loculi. The 3 species of Mycteronastes accepted herein are parasitic within the olfactory sacs of rays and sawfishes: Mycteronastes icopae ( Beverley-Burton and Williams, 1989 ) Kearn and Beverley-Burton, 1990 (type species) from the giant shovelnose ray, Glaucostegus typus (Anonymous (Bennett)) (Glaucostegidae), in the southwestern Pacific Ocean; Mycteronastes undulatae Kearn and Beverley-Burton, 1990 from the undulate ray, Raja undulata Lacepède (Rajidae), in the northeastern Atlantic Ocean; and Mycteronastes caalusi n. sp. from the smalltooth sawfish, Pristis pectinata Latham (Pristidae), in the Gulf of Mexico. Mycteronastes caalusi is most easily differentiated from its congeners by the combination of having 2 median cephalic papillae, an oval haptor that is wider than the body proper and lacks a deeply scalloped margin, a comparatively large anteromedial peripheral loculus, an unsclerotized male copulatory organ that is wholly anterior to the vaginal pores, a relatively small distal portion of the uterus (ootype chamber) that is mostly anterior to the vaginae, and a delicate uterus. The present study is the first report of a monocotylid from the olfactory sacs of P. pectinata and the first record of a species of Mycteronastes from the Gulf of Mexico. Notes on the taxonomy and systematics of some species assigned to Calicotyle Diesing, 1850 (Monocotylidae: Calicotylinae) are included.
1990年，克尔恩和贝弗利 - 伯顿所描述的Mycteronastes（单殖吸虫纲：单杯科：Merizocotylinae亚科）从与1894年塞尔丰泰纳描述的Merizocotyle的主观同物异名中被重新确立，其诊断特征被修订为包括单杯科吸虫，这些吸虫的抱器没有中央腔，有5个周边腔（两对双侧腔和一个不成对的前内侧腔）、1个间钩和17个边缘腔。本文认可的Mycteronastes的3个物种寄生于魟和锯鳐的嗅囊中：Mycteronastes icopae（贝弗利 - 伯顿和威廉姆斯，1989年）克尔恩和贝弗利 - 伯顿，1990年（模式种），来自西南太平洋的巨铲鼻魟Glaucostegus typus（匿名（贝内特））（魟科）；Mycteronastes undulatae克尔恩和贝弗利 - 伯顿，1990年，来自东北大西洋的波状魟Raja undulata Lacepède（鳐科）；以及来自墨西哥湾的小齿锯鳐Pristis pectinata Latham（锯鳐科）的新物种Mycteronastes caalusi。Mycteronastes caalusi最容易与同属其他物种区分开来，其特征组合包括有2个中位头部乳突、一个比身体本身宽且边缘没有深深扇贝状的椭圆形抱器、一个相对较大的前内侧周边腔、一个完全位于阴道孔前方的未硬化雄性交配器官、子宫远端部分（卵模腔）相对较小且大多位于阴道前方，以及一个精致的子宫。本研究是首次报道来自小齿锯鳐嗅囊的单杯科吸虫，也是首次记录来自墨西哥湾的Mycteronastes属物种。文中还包括了对一些归入1850年迪辛描述的Calicotyle（单杯科：Calicotylinae亚科）物种的分类学和系统学注释。
