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 : 92-93

Key to species of Bopyrissa based on males [ B. dawydoffi

( Codreanu & Codreanu, 1963), not included in the key]

1. Pleotelson with greatly extended lateral lobes, longer than width of pleotelson..................................................................2

– Pleotelson with weakly projecting (or absent) lateral lobes, at most extending as far as width of pleotelson.........................3

2. Pleomere 5 lateral lobes extending over anterior half of pleotelson; body nearly elliptical in outline ............................. ................................................. B. liberorum Markham, 1985b

– Pleomere 5 lateral lobes scarcely extending over pleotelson; body nearly linear in outline..................................................... ......... B. novaeguineensis ( Danforth, 1971) , new combination

3. No midventral tubercles on pleomeres 1–5............................4

– Midventral tubercles on some pleomeres.............................10

4. Pleotelson rounded, low ridges with setae ............................... ................................................... B. xiphidiostega , new species

– Pleotelson with posterolateral lobes of various lengths.........5

5. Pereomeres 5 and 6 broader than anterior pereomeres..........6

– Pereomeres 2–5 subequal in width.........................................7

6. Anal cone not projecting............. B. pyriforma ( Shiino, 1958)

– Anal cone projecting ...... B. kensleyi ( Williams & Schuerlein, 2005) , new combination

7. Pleopods large, oblong, laterally positioned inflated lobes ..... .......................................................... B. wolffi Markham, 1978

– Pleopods small, rounded, inflated lobes not extending to lateral margins of pleomeres..............................................................8

8. Pleopods not present on pleomere 5, medially positioned ....9

– Pleopods present on pleomeres 1-5, not medially positioned. .......................................................... B. diogeni ( Popov, 1929)

9. Pleopods present on pleomeres 1–4, pleopods nearly spherical.............................................. B. marami , new species

– Pleopods present on pleomeres 1–3, pleopods conical............ ................................. B. guamensis An, Gong & Paulay, 2018

10. Midventral tubercle on pleomere 1 only ..............................11

– Midventral tubercles on pleomeres 1–5 ...............................12

11. Pleopods on pleomeres 1–3 ...................................................... ..................................... B. distorta An, Gong & Paulay, 2018

– Pleopods on pleomeres 1–5 ...................................................... ..................................... B. oceania An, Gong & Paulay, 2018

12. Pleopods and midventral tubercles nearly spherical ................ ...................................................... B. fraissei ( Carayon, 1943)

– Pleopods oblong; midventral tubercles conical........................ ........... B. magellanica Nierstrasz & Brender à Brandis, 1931