Potamopyrgus antipodarum
Creators: name: Hechinger, Ryan F.
Publisher: name: Zenodo
Year: 2012
Subjects: Biodiversity
Taxonomy
Animalia
Mollusca
Gastropoda
Littorinimorpha
Hydrobiidae
Potamopyrgus
Potamopyrgus antipodarum

description: Key to trematodes infecting Potamopyrgus antipodarum as first intermediate host
[Species number in brackets preceding name matches numbering in Fig. 1 and Table 1, and the ordering in the species accounts section.]
1. Lacking daughter parthenitae (sporocysts or rediae), free embryos appear to develop directly to over 100 spherical metacercariae that fill much of visceral mass................................................. [13] Microphallus sp. “livelyi”
- With parthenitae...................................................................................... 2
2. Cercariae lacking tail, with oral stylet.......................................... [15] Acaudate xiphidiocercaria sp. I
- Cercariae with tail (small cup-like, simple, forked, finned or bristled); with or without stylet.......................... 3
3 Tail small and cup-like (not more than 2x long as wide); stylet with two anterior points…........[11, 12] Coitocaecum spp.
- Tail elongate (e.g.,> 3x long as wide); if stylet present, lacking two anterior points.................................. 4
4 Tail forked........................................................................................... 5
- Tail not-forked........................................................................................ 7
5 Tail stem and furcae each about same length as body............................................ [1] Apatemon sp. I
- Tail stem at least 2x body length; caudal furcae short (much less than 1/2 stem length).................. (aporocotylids) 6
6 Cercaria smaller than 6b (body <100 long, tail stem <200 long); sporocysts round to slightly oblong.. [2] Aporocotylid sp. I
- Cercaria larger than 6a (body> 130 long, tail stem> 200 long); sporocysts elongate................ [3] Aporocotylid sp. II
7 Cercaria with oral stylet (may be minute & non-descript—see Plagiorchioid sp. I).................................. 8
- Cercaria lacking oral stylet............................................................................. 11
8 With virgula organ (sack-like organ in posterior oral sucker).................................................... 9
- Lacking virgula organ................................................................................. 10
9 Cercaria smaller than 9b (body <100 long), virgula organ wider than long, faintly bipartite or not bipartite.[16] Virgulate sp. I
- Cercaria larger than 9a (body> 130 long); virgule organ longer than wide, clearly bipartite............ [17] Virgulate sp. II
10 With prominent ventral sucker, Y-shaped bladder, small bullet-shaped stylet (less than 1/5 oral sucker length), and obscuring cystogenous glands throughout most of body.............................................. [18] Plagiorchioid sp. I
- Lacking ventral sucker, with elongate stylet (> ½ oral sucker length); body translucent with prominent penetration glands just posterior to equator............................................................[14] Microphallus sp. “poulini”
11 With pigmented eyespots.............................................................................. 12
- Lacking pigmented eyespots............................................................................ 17
12 With ventral sucker................................................................................... 13
- Lacking ventral sucker................................................................................ 15
13 Tail simple, not ornate............................................................. [19] Gymnocephalous sp. I
- Tail with lateral bristles................................................................... (lepocreadiids) 14
14 With 4 pairs of penetration glands................................................... [8] Stegodexamine anguillae
- With 6 pairs of penetration glands........................................................ [9] Lepocreadiid sp. II
15 Lacking dorso-ventral tail fin; sometimes with medial eye....................................[5, 6] Notocotylus spp.
- With dorso-ventral tail fin.............................................................................. 16
16 With penetration glands (gland bodies just pre-equator and gland ducts empty at anterior oral sucker); lacking longitudinal pig- ment bands..................................................................... [10] Telogaster opisthorchis
- Lacking penetration glands; with two longitudinal pigment bands........................... [7] Pronocephaloid sp. IV
17 Lacking ventral sucker; tail simple; body filled with opaque cystogenous glands (white with reflected light); prominent lateral arms of excretory system connect anteriorly; smaller than 17b (body length ~500)................[4] Pronocephaloid sp. I
- With ventral sucker; tail with dorso-ventral fin; larger than 17a (body length ~1000)…......... [20] Gymnocephalous sp. II
description: Published as part of Hechinger, Ryan F., 2012, Faunal survey and identification key for the trematodes (Platyhelminthes: Digenea) infecting Potamopyrgus antipodarum (Gastropoda: Hydrobiidae) as first intermediate host, pp. 1-27 in Zootaxa 3418 on pages 5-6, DOI: 10.5281/zenodo.210378