Astiotrema Looss, 1900

Karar, Yasser F. M., Blend, Charles K., Dronen, Norman O. & Adel, Asmaa, 2021, Towards resolving the problematic status of the digenean genus Astiotrema Looss 1900: An updated concept and revision of species composition for Astiotrema (sensu stricto), Zootaxa 4991 (1), pp. 36-72 : 59-60

publication ID	https://doi.org/10.11646/zootaxa.4991.1.2
publication LSID	lsid:zoobank.org:pub:585A1043-224B-488B-ADBA-47DE8DE27869
DOI	https://doi.org/10.5281/zenodo.5088952
persistent identifier	https://treatment.plazi.org/id/5046879B-FFCC-A519-4D86-F8F85AFFFD08
treatment provided by	Plazi
scientific name	Astiotrema Looss, 1900
status

Treatment

Key to species of Astiotrema Looss, 1900 ( sensu stricto)

1a. Cecal ends either not reaching significantly into or do not exceed testicular zone.................................. 2.

1b. Cecal ends extending deeply into post-testicular zone....................................................... 5.

2a. Cecal ends and posterior vitellarium extent exceed level of anterior testis; parasitize non-amphibian hosts.............. 3.

2b. Cecal ends and posterior vitellarium extent do not exceed level of anterior testis; parasitize amphibian hosts........................................................ Astiotrema ranarum ( Mehra & Negi, 1926) Fotedar, 1971 ( Figs. 12–14 View FIGURES 12–14 ).

3a. Anterior extent of vitellarium does not exceed bifurcal level; ovary distant from ventral sucker and closer to anterior testis.................................................................................................... 4.

3b. Anterior extent of vitellarium pre-bifurcal and can reach to pharyngeal level; ovary contiguous with or very close to ventral sucker and more distant from anterior testis............... Astiotrema impletum ( Looss, 1899) Looss, 1900 ( Figs. 6–11 View FIGURES 6–8 View FIGURES 9–11 ).

4a. Anterior extent of vitellarium bifurcal; oral sucker distinctly larger than ventral sucker; parasitizes marine turtles........................................... Astiotrema karachiensis Bilqees, Khatoon & Khan, 2002 n. comb. ( Figs. 26 & 27 View FIGURES 26 & 27 ).

4b. Anterior extent of vitellarium post-bifurcal; suckers roughly equal in size; parasitizes freshwater turtles and fish...................................................................... Astiotrema odhneri Bhalerao, 1936 ( Figs. 17–20 View FIGURES 17–20 ).

5a. Anterior extent of vitellarium pre-ovarian but does not reach pre-bifurcal level, posterior extent terminates anterior to cecal ends.............................................................................................. 6.

5b. Anterior extent of vitellarium pre-bifurcal, posterior extent terminates at cecal ends or slightly further posteriorly........................................................................ Astiotrema fotedari Dhar, 1977 ( Figs. 23–25 View FIGURES 23–25 ).

6a. Genital pore immediately anterior to ventral sucker; ventral sucker relatively close to intestinal bifurcation............. 7.

6b. Genital pore anterior to ventral sucker by a distinct distance; ventral sucker distant from intestinal bifurcation...................................................................... Astiotrema cyclemysi Siddiqi, 1965 ( Figs. 21 & 22 View FIGURES 21 & 22 ).

7a. Esophagus distinct, long; anterior extent of vitellarium does not reach anterior to ventral sucker; ovary smaller than testes.......................................... Astiotrema reniferum ( Looss, 1898) Looss, 1900 [ type species] ( Figs. 1–5 View FIGURES 1–5 ).

7b. Esophagus indistinct or very short; anterior extent of vitellarium reaches anterior to ventral sucker and is confluent medially in pre-acetabular region; ovary and testes roughly equal in size........... Astiotrema emydis Ejsmont, 1930 ( Figs. 15 & 16 View FIGURES 15 & 16 ).