Pleurocryptella Bonnier, 1900

Williams, Jason D., Boyko, Christopher B. & Marin, Ivan N., 2020, A new species and depth record of bopyrid (Crustacea, Isopoda) from a squat lobster in the Kuril-Kamchatka Trench, European Journal of Taxonomy 724, pp. 122-133 : 127-130

Key to females of species of Pleurocryptella Bonnier, 1900 *

1. Uropods surrounded by distolateral margins of pleomere 5........................ P. wolffi Bourdon, 1972b

– Uropods not surrounded by distolateral margins of pleomere 5........................................................ 2

2. Uropods shorter than pleotelson, scarcely projecting beyond distolateral margins of pleomere 5 ... 3

– Uropods longer than pleotelson, projecting well beyond distolateral margins of pleomere 5 .......... 5

3. Total body length and width subequal; pronounced digitations on pereomeres of long side.............. .................................................................................................................... P. formosa Bonnier, 1900

– Body much longer than wide............................................................................................................. 4

4. Posterior margins of all pereomeres smooth........................................... P. fimbriata Markham, 1974

– Posterior margins of pereomeres 5–7 wavy.............................................................. P. altalis sp. nov.

5. Antenna with 6 segments...................................................................... P. crassandra Bourdon, 1976

– Antenna with 5 segments................................................................................................................... 6

6. Body strongly tapering from anterior to posterior, head not extending beyond anterolateral margins of pleomere 1 ..................................................................................................................................... 7

– Body gradually tapering from anterior to posterior, head extending beyond anterolateral margins of pleomere 1 ......................................................................................................................................... 8

7. Lobes of barbula distally acute, outer lobe approximately three times as long as inner lobe ............. ............................................................................................................. P. laevis ( Richardson, 1910) **

– Lobes of barbula distally rounded, outer lobe approximately twice as long as inner lobe.................. ................................................................................................................... P. superba Bourdon, 1981

8. Pleotelson and uropods ventral to pleomere 5; pronounced digitations (tubercles) on pereomeres of short side.................................................................................. P. infecta tuberculata Bourdon, 1976

– Pleotelson and uropods between pleomere 5 in ventral view; lacking pronounced digitations (tubercles) on pereomeres........................... P. infecta infecta Nierstrasz & Brender à Brandis, 1923

* Pleurocryptella latimellaris (Nierstrasz & Brender à Brandis, 1931) not included in the key.

** Data for P. laevis based on Bourdon (unpublished MS).

Key to males of species of Pleurocryptella Bonnier, 1900 *

1. Midventral tubercle on pleomere 7.............................................................. P. wolffi Bourdon, 1972b

– No midventral tubercle on pleomere 7 .............................................................................................. 2

2. Midventral tubercles low, broad and extending between pleopods on pleomeres 1–4...................... 3

– Midventral tubercles small, semispherical and medially situated ..................................................... 4

3. Lateral margins of pleomeres strongly curled ventrally, covering pleopods............ P. altalis sp. nov.

– Lateral margins of pleomeres slightly curled ventrally, not covering pleopods.................................. .................................................................................................................... P. formosa Bonnier, 1900

4. Midventral tubercles only on pleomeres 1–3....................................................................................... ......................................... P. laevis ( Richardson, 1910) ** & P. infecta tuberculata Bourdon, 1976 ***

– Midventral tubercles on more than pleomeres 1–3............................................................................ 5

5. Midventral tubercles on pleomeres 1–4.................................................. P. fimbriata Markham, 1974

– Midventral tubercles on pleomeres 1–5............................................................................................. 6

6. Pleon markedly narrower than pereon........ P. infecta infecta Nierstrasz & Brender à Brandis, 1923

– Pleon not markedly narrower than pereon......................................................................................... 7

7. Antenna with 7 segments...................................................................... P. crassandra Bourdon, 1976

– Antenna with 5 segments........................................................................... P. superba Bourdon, 1981

* Pleurocryptella latimellaris (Nierstrasz & Brender à Brandis, 1931) not included in the key.

** Data for P. laevis based on Bourdon (unpublished MS).

*** Based on published and unpublished data, the males of P. laevis and P. infecta tuberculata are indistinguishable.