Cyclocoelum Brandes 1892
Creators: name: Dronen, Norman O.
name: Blend, Charles K.
Publisher: name: Zenodo
Year: 2015
Subjects: Biodiversity
Taxonomy
Animalia
Platyhelminthes
Trematoda
Plagiorchiida
Cyclocoelidae
Cyclocoelum

description: Key to the species of Cyclocoelum Brandes, 1892
1a. Rudimentary oral sucker absent.......................................................................... 2
1b. Rudimentary oral sucker present........................................................................ 4
2a. Uterus largely intercecal, posterior loops not reaching posterior margin of posterior testis.............................................................................. C. mutabile (Zeder, 1800) (Syn. C. microstomum Creplin, 1829)
2b. Uterine loops extensively overlapping the ceca laterally reaching nearly to body wall; posterior loops reaching posterior mar- gin of posterior testis................................................................................. 3
3a. Pharynx relatively wide, more than 1,000 µm; intertesticular space long, more than 2,500 µm, about 14% of body length.................................................................................. C. robustum Stossich, 1902
3b. Pharynx relatively narrow, 80–130 µm; intertesticular space relatively short, 1,500 µm or less, about 8% of body length................................................................................. C. microcotyleum Noble, 1933
4a. Uterine loops commonly overlapping ceca laterally.................................... C. macrorchis Harrah, 1922
4b. Uterus largely intercecal............................................................................... 5
5a. Eggs relatively large, greater than 130 µm long........................................ C. obscurum (Leidy, 1887)
5b. Eggs relatively small, less than 130 µm long............................................................... 6
6a. Eggs exceptionally small, 90–93 µm x 47 –49 µm...................................... C. bikanerensis Gupta, 1964
6b. Eggs more moderately sized, 102 µm x 51 µm or larger...................................................... 7
7a. Cirrus sac relatively long, 1,200 µm or more, 8% or more of body length........... C. pseudomicrostomum Harrah, 1922
7b. Cirrus sac relatively short, 700 µm or less, 5% or less of body length........................................... 8
8a. Intertesticular space relatively short, 450–880 µm long, about 2–8% of body length................................................................................. C. leidyi Harrah, 1922 (Syn. Cyclocoelum cuneatum Harrah, 1922)
8b. Intertesticular space relatively long, 3,000–5,800 µm, about 13–16% of body length.................................................................................. C. mehrotrai Sinha & Sahay, 1975 (Syn. C. mathuri Jain, 1984)
description: Published as part of Dronen, Norman O. & Blend, Charles K., 2015, Updated keys to the genera in the subfamilies of Cyclocoelidae Stossich, 1902, including a reconsideration of species assignments, species keys and the proposal of a new genus in Szidatitreminae Dronen, 2007, pp. 1-100 in Zootaxa 4053 (1) on page 18, DOI: 10.11646/zootaxa.4053.1.1, http://zenodo.org/record/237117