Bopyrissa

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, Raffles Bulletin of Zoology 67, pp. 83-118 : 92

Key to species of Bopyrissa based on females

1. Lateral plates large, exceeding width of pleon ........................ ........................... B. dawydoffi ( Codreanu & Codreanu, 1963)

– Lateral plates not exceeding width of pleon ..........................2

2. Oostegite 1 posterior lobe elongate, tapering, acute..............3

– Oostegite 1 posterior lobe short, rounded ..............................8

3. Single lateral, elongate, tapered lobe on barbula ...................4

– Small medial lobe present in addition to lateral lobe ............6

4. Oostegite 1 inner ridge nearly smooth; maxilliped anterior anterior margin smooth .................... B. diogeni ( Popov, 1929)

– Oostegite 1 inner ridge with several rounded lobes; maxilliped anterior margin with notch......................................................5

5. Lateral margin of first pereomere projecting anteriorly beyond lateral margin of head ............................................................... ..................................... B. distorta An, Gong & Paulay, 2018

– Lateral margin of first pereomere not projecting anteriorly beyond lateral margin of head .... B. pyriforma ( Shiino, 1958)

6. Maxilliped without palp ............ B. xiphidiostega , new species

– Maxilliped with non-articulating palp ....................................7

7. Outer lobe of barbula nearly smooth........................................ ........... B. magellanica Nierstrasz & Brender à Brandis, 1931

– Outer lobe of barbula digitate................................................... ................................. B. guamensis An, Gong & Paulay, 2018

8. Pleomere 5 with distinct medial separation between lobes ...9

– Pleomere 5 without distinct medial separation between lobes ...............................................................................................12

9. Head extending anteriorly well beyond pereomere 1 .............. ......... B. novaeguineensis ( Danforth, 1971) , new combination

– Head almost entirely subsumed into pereomere 1 ...............10

10. Barbula with single outer lobe, maxilliped with articulated palp .......................................... B. liberorum Markham, 1985b

– Barbula with small additional medial lobe, maxilliped without palp ........................................................................................11

11. Lateral lobe of barbula and medial region tuberculate............ ...................................................... B. fraissei ( Carayon, 1943)

– Lateral lobe of barbula and medial region smooth.................. ..................................... B. oceania An, Gong & Paulay, 2018

12. Posterior lobe of oostegite 1 with recurved projection, barbula without small additional medial lobe ....................................... .......................................................... B. wolffi Markham, 1978

– Posterior lobe of oostegite 1 with triangular projection, barbula with small additional medial lobe.........................................13

13. Maxilliped without palp, barbula outer lobe smooth, antenna with fusion of segments ............................................................ B. kensleyi ( Williams & Schuerlein, 2005) , new combination

– Maxilliped with palp, barbula outer lobe digitate, antenna without fusion of segments ................ B. marami , new species