Nuuanu Barnard, 1970

Jung, Tae Won & Yoon, Seong Myeong, 2015, New records of Nuuanuidae (Crustacea: Amphipoda: Senticaudata) from Korean waters, with descriptions of one new genus and two new species, Journal of Natural History 50, pp. 1045-1072 : 1057-1059

Genus Nuuanu Barnard, 1970

(Korean Name: Nu-a-nu-yeop-sae-u-sok, new)

Diagnosis

Head, anterior lobe developed, subrectangular or subtriangular in shape; anteroventral notch mostly developed; eyes rudimentary or absent. Antenna 1, accessory flagellum present, mostly tri-articulate. Gnathopods 1 and 2 subchelate, dissimilar in size and shape. Gnathopod 1, anteroventral corner of merus subacutely produced. Pereopod 7 longer than pereopod 5; basis posteriorly expanded and shield-like, posterior margin crenulate. Pleonites 1 and 2 with dorsal spines. Pleonal epimeron 1, anteroventral corner mostly round or acutely produced forward. Urosomite 1 without dorsal keel. Uropod 1, peduncle with basofacial spine mostly. Uropod 3 parviramous, outer ramus short and inner ramus small to minute, always less than half length of outer; outer ramus bi-articulate, distal article very short if present. Telson deeply or fully cleft (modified from Senna and Serejo 2012).

Type species

Nuuanu amikai Barnard, 1970

Included species

Nuuanu amikai Barnard, 1970 , N. merringannee ( Barnard, 1974) ; N. mokari Barnard, 1974 ; N. numbadi Barnard, 1974 ; N. muelleri Ortiz, 1976 ; N. castellana ( Griffiths, 1977) ; N. copillius ( McKinney and Barnard, 1977) ; N. curvata Vonk, 1989 ; N. garciai ( Martí and Villora-Moreno, 1995) ; N. utwe ( Myers, 1995) ; N. kata Lowry and Watson, 2002 ; N. rectimana Appadoo and Myers, 2005 ; N. beatricis Jaume and Box, 2006 ; N. hanamurai Tomikawa et al., 2007 ; N. peroa Senna and Serejo, 2012 ; N. quintalana Hughes and Bopiah, 2013 ; N. stuckeyorum Hughes and Bopiah, 2013 ; N. titaseyi Hughes and Bopiah, 2013 ; N. paracyclodactyla sp. nov.

Remarks

Lowry and Watson (2002) revised the genus level of ‘ gammarellid group ’ and then suggested the hypothesis of phylogenetic relationship between the species included in Nuuanu and Gammarella . In this previous report, Nuuanu was discriminated from Gammarella by several plesiomorphies, such as the absence of well-developed dorsal keel on urosomite, the poorly developed eyes and the small body size ( Lowry and Watson 2002). Later, Lowry and Watson ’ s ‘ gammarellid group ’ was established as the Nuuanuidae by Lowry and Myers (2013), but the perspective of classification between Nuuanu and Gammarella is still valid.

Key to known species of the genus Nuuanu

1. Anterior cephalic lobe triangular, apex acute ....................................................................... 2 Anterior cephalic lobe not triangular......................................................................................... 8

2. Telson fully cleft......................................... ......................................... N. moraki Barnard, 1974 Telson not fully cleft.......................................................................................................................... 3

3. Uropod 3, outer ramus subequal or longer than peduncle............................................ 4 Uropod 3, outer ramus shorter than peduncle ..................................................................... 7

4. Pereopods 5 – 7, basis, posterior margin weakly crenulate.................................................... ............................................................................................ N. titaseyi Hughes and Bopiah, 2013 Pereopods 5 – 7, basis, posterior margin strongly crenulate ............................................. 5

5. Eyes apparently absent.................................................... N. kata Lowry and Watson, 2002 Eyes rudimentary ................................................................................................................................ 6

6. Gnathopod 2, dactylus longer than half of propodus............................................................ ................................................................................................... N. peroa Senna and Serejo, 2012 Gnathopod 2, dactylus shorter than half of propodus........ N. amikai Barnard, 1970

7. Accessory flagellum 4-articulate......... ......... N. quintalana Hughes and Bopiah, 2013 Accessory flagellum uni-articulate................... ................... N. castellana ( Griffiths, 1977)

8. Anterior cephalic lobe, apex round ........................................................................................... 9 Anterior cephalic lobe, apex subquadrate............................................................................ 12

9. Mandible, palp, article 3 not falcate................................................ N. curvata Vonk, 1989 Mandible, palp, article 3 falcate ................................................................................................ 10

10. Pereopods 5 – 7 more stout; dactylus shorter than half of propodus........................ 11 Pereopods 5 – 7 more slender; dactylus about half of propodus........................................ ............................................................................................. N. hanamurai Tomikawa et al., 2007

11. Uropod 1, peduncle, dorsolateral spine strong.................. N. numbadi Barnard, 1974 Uropod 1, peduncle, dorsolateral spine weak............................................................................ ................................................................................. N. copillius ( McKinney and Barnard, 1977)

12. Telson fully cleft ............................................................................................................................... 13 Telson deeply cleft .......................................................................................................................... 14

13. Mandibular palp, article 3 falcate............... ............... N. beatricis Jaume and Box, 2006 Mandibular palp, article 3 not falcate.... .... N. garciai ( Martí and Villora-Moreno, 1995)

14. Pereopods 5 – 7, basis, posterior margin strongly crenulate .......................................... 15 Pereopods 5 – 7, basis, posterior margin weakly crenulate............................................. 16

15. Uropod 3, outer ramus longer than peduncle............................ N. muelleri Ortiz, 1976 Uropod 3, outer ramus subequal to peduncle... ... N. merringannee ( Barnard, 1974)

16. Uropod 3, outer ramus to peduncle shorter.................... N. paracyclodactyla sp. nov. Uropod 3, outer ramus subequal than peduncle .............................................................. 17

17. Gnathopod 2, dactylus shorter than half of propodus in males........................................ ................................................................................. N. stuckeyorum Hughes and Bopiah, 2013 Gnathopod 2, dactylus longer than half of propodus in males.................................. 18

18. Gnathopod 2, posteroproximal corner weakly produced, but not acute....................... .......................................................................................................................... N. utwe ( Myers, 1995) Gnathopod 2, posteroproximal corner more produced, acute........................................... ..................................................................................... N. rectimana Appadoo and Myers, 2005