Pseudioninae Codreanu 1967
Creators: name: Williams, Jason D.
name: Boyko, Christopher B.
name: Madad, Asma Z.
Publisher: name: Zenodo
Year: 2019
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Lithodidae

description: Key to genera of Pseudioninae Codreanu, 1967, with species infesting hermit crabs   1. Females with rudimentary oostegites on pereomeres VI and VII......................... Pagurocryptella Boyko & Williams, 2010   
– Females lacking rudimentary oostegites on pereomeres VI and VII............................................................................................2  
2. Females usually greatly distorted, typically 90° or more (if not distorted then with propodal sockets on pereopods)..............3  
– Females less distorted (generally <70°) or nearly symmetrical, lacking propodal sockets on pereopods..................................5  
3. Females with some biramous pleopods..................................4  
 – Females with no biramous pleopods....................................................................................... Bopyrophryxus Codreanu, 1965   
 4. Females with propodal sockets on pereopods, first two pereopods much larger than the others........................................................................ Asymmetrione Codreanu, Codreanu & Pike, 1965   
 – Females without propodal sockets on pereopods, pereopods subequal in size.................................................................................................. Parasymmetrione An, Markham & Yu, 2010   
5. Females with biramous uropods.............................................6  
– Females with uniramous uropods or lacking uropods...........7  
 6. Females with 6 pairs of pleonal lateral plates........................................................................................ Pagurion Shiino, 1933   
 – Females with 5 pairs of pleonal lateral plates................................................................................ Parapagurion Shiino, 1933   
7. Females with pleomere 6 ventrally displaced, not visible in dorsal view..............................................................................8  
– Females with pleomere 6 not ventrally displaced, visible in dorsal view..............................................................................9  
 8. Males with uniramous pleopods................................................................... Bopyrissa Nierstrasz & Brender à Brandis, 1931   
 – Males with biramous pleopods ..... Propseudione Shiino, 1933   
9. Females with pleopod 5 uniramous......................................10  
 – Females with pleopod 5 biramous...... Eremitione, new genus   
 10. F e m a l e s w i t h p l e o p o d s 1 a n d 2 b i r a m o u s, 3 a n d 4 uniramous....................................... Pseudionella Shiino, 1949   
 – Females with pleopods 1–4 biramous................................................. Parapseudione Nierstrasz & Brender à Brandis, 1931
description: Published as part of Williams, Jason D., Boyko, Christopher B. & Madad, Asma Z., 2019, Branchial parasitic isopods (Crustacea: Isopoda: Bopyridae: Pseudioninae) of hermit crabs (Crustacea: Decapoda: Diogenidae) from the western Pacific, with descriptions of a new genus and three new species, pp. 83-118 in Raffles Bulletin of Zoology 67 on page 85, DOI: 10.26107/RBZ-2019-0008, http://zenodo.org/record/5343344