Janiralata, Menzies, 1951

Kim, Sung Hoon, Kim, Jong Guk & Yoon, Seong Myeong, 2022, Description of two new janirid isopods (Isopoda, Asellota, Janiridae) from Korean waters, Zootaxa 5178 (6), pp. 532-546 : 544-545

publication ID

https://doi.org/ 10.11646/zootaxa.5178.6.2

publication LSID

lsid:zoobank.org:pub:B009E7DE-B47C-4295-B20C-D8DDC442F05C

DOI

https://doi.org/10.5281/zenodo.7043934

persistent identifier

https://treatment.plazi.org/id/FF1E9C42-FF8F-C14F-FF1A-FF1CFA487A5C

treatment provided by

Plazi

scientific name

Janiralata
status

 

Key to known species of the genus Janiralata View in CoL in the Northwest Pacific

1. Exopod of pleopod III without plumose setae............................................................... 2

- Exopod of pleopod III with plumose setae.........................................................19 (group D)

2. Pleotelson with either posterolateral points or concavity distally................................................ 3

- Pleotelson without both posterolateral points and concavity distally.................................... 15 (group A)

3. Pleotelson with posterolateral points distally........................................................ 4 (group C)

- Pleotelson without posterolateral points........................................................... 11 (group B)

4. Cephalothorax with a pair of anterolateral projections or none.................................................. 5

- Cephalothorax with 2 pairs of anterolateral projections....................................................... 10

5. Anterolateral projections on cephalothorax absent...................................... J. intermedia Mezhov, 1981 View in CoL

- Anterolateral projections on cephalothorax present........................................................... 6

6. Anterolateral projections on cephalothorax indistinct.................................... J. sarsi ( Richardson, 1905) View in CoL

- Anterolateral projections on cephalothorax distinct........................................................... 7

7. Anterolateral projections on cephalothorax blunt distally.................................. J. bifurcata Mezhov, 1981 View in CoL

- Anterolateral projections on cephalothorax not blunt distally................................................... 8

8. Cephalothorax with distinct rostrum................................................. J. bisinuata Kussakin, 1972 View in CoL

- Cephalothorax with indistinct and reduced rostrum........................................................... 9

9. Pleotelson concave distally; posterolateral points of pleotelson over distal end of medial lobe of pleotelson............................................................................................... J. pilosa Kussakin, 1962 View in CoL

- Pleotelson convex distally; posterolateral points of pleotelson not reaching distal end of medial lobe of pleotelson..................................................................................... J. occidentalis (Walker, 1898) View in CoL

10. Anterolateral projections on cephalothorax bifid distally; pleotelson shallowly serrated on lateral margin....................................................................................... J. bilobata Kussakin & Mezhov, 1979 View in CoL

- Anterolateral projections on cephalothorax not bifid distally; pleotelson lateral margin deeply serrated..................................................................................... J. problematica Kussakin & Mezhov, 1979 View in CoL

11. Rostrum in cephalothorax present....................................................................... 12

- Rostrum in cephalothorax absent or reduced............................................................... 14

12. Rostrum not exceeding anterolateral projections.......................................... J. vitjazi Kussakin, 1962 View in CoL

- Rostrum exceeding anterolateral projections............................................................... 13

13. Rostrum long, almost half length of cephalothorax....................................... J. tricornis ( Krøyer, 1847) View in CoL

- Rostrum relatively short, one-third of cephalothorax.................................... J. kurilensis Kussakin, 1962 View in CoL

14. Anterior margin of cephalothorax slightly pointed in the middle; pleopod II in females convex distally.............................................................................................. J. erostrata ( Richardson, 1899) View in CoL

- Anterior margin of cephalothorax rounded in the middle; pleopod II in females concave distally.................................................................................................... J. soldatovi ( Gurjanova, 1933) View in CoL

15. Anterolateral projections in cephalothorax present and distinct...................... J. sagamiensis ( Shimomura, 2006) View in CoL

- Anterolateral projections in cephalothorax absent or reduced.................................................. 16

16. Anterolateral projections in cephalothorax reduced and indistinct.............................................. 17

- Anterolateral projections in cephalothorax absent........................................................... 18

17. Anterior margin of cephalothorax convex; pleopod Ⅰ of males without distomedial lobes.......... J. modesta Mezhov, 1981 View in CoL

- Anterior margin of cephalothorax not convex; pleopod Ⅰ of males with distomedial lobes.......... J. koreanesis Jang, 1991

18. Anterolateral margin of cephalothorax angled; eyes small and its length less than half of cephalothorax........................................................................................... J. microphthalma Kussakin, 1972 View in CoL

- Anterolateral margin of cephalothorax rounded; eyes relatively large and its length over half of cephalothorax.......................................................................................... J. obliterata Kussakin, 1972 View in CoL

19. Cephalothorax with prominent rostrum................................................................... 20

- Cephalothorax without rostrum......................................................................... 22

20. Rostrum with blunt or round distally....................................... J. aberrantis Kussakin & Mezhov, 1979 View in CoL

- Rostrum with acute tip distally.......................................................................... 21

21. Anterolateral projections of cephalothorax expanding forwardly; posterolateral points of pleotelson reaching distal end of pleotelson.................................................................. J. rhacuraeformis Birstein, 1963 View in CoL

- Anterolateral projections of cephalothorax expanding diagonally; posterolateral point of pleotelson expanding beyond distal end of pleotelson................................................................ J. hexadentata Birstein, 1970 View in CoL

22. Lateral margins of cephalothorax and pleotelson serrated.................................... J. serrata Birstein, 1963 View in CoL

- Lateral margins of cephalothorax and pleotelson smooth..................................................... 23

23. Pleotelson with posterolateral points; distal region of pleotelson concave........................................ 24

- Pleotelson without posterolateral points; distal region of pleotelson rounded and convex............................ 25

24. Anterolateral projections of cephalothorax long and acute distally; its length half of cephalothorax.................................................................................................. J. gurjanovae Kussakin, 1962 View in CoL

- Anterolateral projections short and subacute distally; its length a quarter of cephalothorax...... J. ochotensis Kussakin, 1962

25. Pereonites 2 and 3 deeply bilobed; coxal plates of pereonites 2‒4 invisible dorsally; pleotelson not truncated distally..... 26

- Pereonites 2 and 3 not deeply bilobed; coxal plates of pereonites 2‒4 visible dorsally; pleotelson truncated distally.............................................................................................. J. truncata View in CoL sp. nov.

26. Carpus of pereopod Ⅰ with 6 robust inferior setae; pleopod II of females concave distally; exopod of pleopod III with 11 plumose distal setae.................................................................... J. chuni ( Thielemann, 1910) View in CoL

- Carpus of pereopod Ⅰ with 8 robust inferior setae; pleopod II of females convex distally; exopod of pleopod III with 16 plumose distal setae....................................................................... J. shiinoi Kussakin, 1962 View in CoL

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Isopoda

Family

Janiridae

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