Sunamphitoe kanaka, Peart & Hughes, 2013

Peart, R. A. & Hughes, L. E., 2013, Ampithoid amphipods from the South Pacific: Papua New Guinea, French Polynesia and New Caledonia, Journal of Natural History (J. Nat. Hist.) 48 (13 - 14), pp. 739-861 : 844-851

publication ID	https://doi.org/ 10.1080/00222933.2013.825027
persistent identifier	https://treatment.plazi.org/id/F81E87FD-8268-FFE2-FE32-6537FDBE5A83
treatment provided by	Felipe
scientific name	Sunamphitoe kanaka
status	sp. nov.

Treatment

Sunamphitoe kanaka View in CoL sp. nov.

( Figures 79–82 View Figure 79 View Figure 80 View Figure 81 View Figure 82 )

Type material

Holotype male, 7 mm, dissected, one slide, AM P.84606, Pointe Bagay , New Caledonia (22 ◦ 18.23 ′ S, 166 ◦ 26.15 ′ E), 0.5 m, brown alga Sargassum sp. , 18 November 1995, coll. I. Takeuchi (NCL-130) GoogleMaps . Paratype female, 6 mm, dissected four slides, AM P.84607; paratypes, several specimens, AM P.84608, same location as holotype GoogleMaps .

Type locality

Pointe Bagay , New Caledonia (22 ◦ 18.23 ′ S, 166 ◦ 26.15 ′ E) GoogleMaps .

Etymology

Named for the Kanak indigenous people of New Caledonia.

Additional material examined

New Caledonia. Many specimens, AM P.84609, Recif Ricaudy (22 ◦ 18 ′ 14 ′′ S, 166 ◦ 26 ′ 09 ′′ E), 1.5 m, coral rubble, 30 October 1995, coll. A.A. Myers (NCL-3); 11 specimens, AM P.84610, Recif Ricaudy (22 ◦ 18 ′ 14 ′′ S, 166 ◦ 26 ′ 09 ′′ E), 1.0 m, anastomosing red alga, 30 May 1995, coll. A.A. Myers (NCL-4); 10 specimens, AM P.84611, Anse Vata, Pointe Bagay (22 ◦ 18 ′ 14 ′′ S, 166 ◦ 26 ′ 09 ′′ E), 0.3 m, brown alga Sargassum sp. , 1 November 1996, coll. A.A. Myers (NCL-16); two specimens, AM P.84612, Recif Ricaudy (22 ◦ 18 ′ 14 ′′ S, 166 ◦ 26 ′ 09 ′′ E), 0.5 m, brown alga Padina sp. , 4 November 1995, coll. A.A. Myers (NCL-19); 14 specimens, AM P.84613, entrance of Baie de Citron (22 ◦ 18 ′ 10 ′′ S, 166 ◦ 26 ′ 04 ′′ E), 1.5 m, brown alga Sargassum sp. , 13 November 1995, coll. I. Takeuchi (NCL-79); one specimen AM P.84614, Recif Goro (22 ◦ 19 ′ 14 ′′ S, 166 ◦ 23 ′ 18 ′′ E), 1.0 m, dead coral Acropora sp. , 5 November 1995, coll. A.A. Myers (NCL-24); three specimens, AM P.84615, midway between Ilot des Goelands and Grand Recif Abore (22 ◦ 24 ′ 06 ′′ S, 166 ◦ 20 ′ 54 ′′ E), 11 m, white sands, green calcareous alga Halimeda sp. , 16 November 1995, coll. I. Takeuchi (NCL-129); many specimens, AM P.84616, Anse Vata, Pointe Bagay (22 ◦ 18 ′ 14 ′′ S, 166 ◦ 26 ′ 09 ′′ E), 0.5 m, brown alga Sargassum sp. , 18 November 1995, coll. I. Takeuchi (NCL-130); several specimens, AM P.84617, Anse Vata, Pointe Bagay (22 ◦ 18 ′ 14 ′′ S, 166 ◦ 26 ′ 09 ′′ E), 0.5 m, brown alga Sargassum sp. , 18 November 1995, coll. I. Takeuchi (NCL-131); two specimens, AM P.84618, Roche Percé, Poé (22 ◦ 00 ′ S, 166 ◦ 00 ′ E), 0.3 m, brown alga Sargassum sp. and Padina sp. from rocky shore, 19 November 1995, coll. A.A. Myers (NCL-132); two specimens, AM P.84619, Roche Percé, Poé (22 ◦ 00 ′ S, 166 ◦ 00 ′ E), 2 m, red alga from rocky shore, 19 November 1995, coll. I. Takeuchi (NCL-135); two female specimens, AM P.84620, Baie de Tortue (22 ◦ 00 ′ S, 166 ◦ 00 ′ E), 0.5 m, brown alga Sargassum sp. from rock platform in middle of sandy beach, 19 November 1995, coll. I. Takeuchi (NCL-136).

Diagnosis

Antenna 2 slender, similar to antenna 1, with short, dense setae on ventral margin; peduncular article 4 longer than article 5; flagellum with 10 articles. Mandible accessory setal row with eight robust setae. Maxilla 1 inner plate with one plumose seta; outer plate palp well developed, slender; article 2 with four apical robust setae. Gnathopod 1 coxa anterior margin straight, anteroventral margin with subquadrate, posteroventral corner with tuft of long slender setae; basis subequal in length to coxa, anterodistal lobe small, subquadrate; carpus rectolinear; propodus subrectangular, palm transverse, entire, defined by subquadrate corner with one robust seta; dactylus overreaching palm. Gnathopod 2 coxa posteroventral corner with tuft of long slender setae; basis subequal in length to coxa, with sparse slender setae, anterodistal lobe small, subquadrate; carpus compressed, cup-shaped; propodus subovoid, palm extremely acute, straight, entire, with distal shelf, palm undefined along posterior margin, without tooth or robust setae; dactylus reaching end of propodus posterior margin, apically subacute, tapering evenly, margin denticulate. Pereopods 3–4 basis anteriorly expanded. Pereopods 5–7 weakly prehensile; basis with marginal robust setae; merus subrectangular; propodus slightly expanded distally. Pereopod 5 propodus short, expanded. Telson trapezoidal, apically truncate with one pair of long slender setae and one pair of plumose apical setae and three pairs of short lateral slender setae.

Description

Based on holotype male, 7 mm, AM P.84606.

Head. Antenna 1 longer than antenna 2; peduncular article 1 subequal to article 2; article 2 length 2.7 times article 3; article 3 length 0.3 times article 1; primary flagellum incomplete with at least 24 articles; accessory flagellum absent. Antenna 2 slender, similar to antenna 1, with short, dense setae on ventral margin; peduncular article 4 longer than article 5; flagellum with 10 articles. Upper lip distally setose. Epistome and upper lip angle directed nearly straight down, around 90 degrees. Mandible molar well-developed, triturating; accessory setal row with eight robust setae; palp absent. Lower lip outer plate notched; inner lobes subequal to outer lobes; mandibular lobe with curved margins, apically subacute. Maxilla 1 inner plate with one plumose seta; outer plate palp well-developed, slender; article 2 with four apical robust setae. Maxilla 2 inner plate narrow; outer plate broader. Maxilliped outer plate with large robust setae.

Pereon. Coxae 1–4 longer than broad. Gnathopod 1 smaller than gnathopod 2; coxa 1 subequal to coxa 2, anterior margin straight, not produced anteroventrally, anteroventral margin with subquadrate, posteroventral corner with tuft of long slen- der setae; basis subequal in length to coxa, anterodistal lobe small, subquadrate; merus anteroventral corner truncate; carpus rectolinear, length twice width, 0.8 times propodus length; propodus subrectangular, length twice width, palm transverse, entire, defined by subquadrate corner with one robust seta, palm length 0.3 times posterior margin; dactylus overreaching palm, apically subacute, tapering evenly, posterior margin denticulate. Gnathopod 2 coxa ventral margin with row of small setules, posteroventral corner with tuft of long slender setae; basis subequal in length to coxa, with sparse slender setae, anterodistal lobe small, subquadrate; carpus compressed, cup-shaped, length 0.5 times width, 0.26 times propodus length; propodus subovoid, length 1.8 times width, palm extremely acute, straight, entire, with distal shelf, palm undefined along posterior margin, without tooth or robust setae; dactylus reaching end of propodus posterior margin, apically subacute, tapering evenly, margin denticulate.

Pereopods 3–4 basis anteriorly expanded. Pereopods 5–7 weakly prehensile; basis with marginal robust setae; merus subrectangular; propodus slightly expanded distally; dactylus recurved. Pereopod 5 propodus short, expanded, length 2.1 times width.

Pleon. Epimera 1–2 posteroventral corner rounded. Epimeron 3 posteroventral corner subquadrate. Uropod 1 long, reaching end of uropod 2 rami; peduncle length 2.6 times width, with nine robust setae, setal fringe extending length of peduncle, distoventral spine large, acute; inner ramus 0.7 times length of peduncle, length six times as long as broad, longer than outer ramus, with four marginal robust setae; outer ramus with five marginal robust setae. Uropod 2 peduncle with four robust setae, with small distoventral spine; inner ramus longer than outer, with six marginal robust setae; outer ramus with six marginal robust setae. Uropod 3 peduncle length 1.7 times breadth, with three distal robust setae, length twice rami; inner ramus length 1.5 times as long as broad, with two distal robust setae; outer ramus slightly shorter than inner ramus, with two large recurved robust setae, with patch of small lateral denticles. Telson trapezoidal, apically truncate, subsubapical cusps small, with one pair of long slender and one pair of plumose apical and 3 pair of short lateral slender setae.

Female (sexually dimorphic characters)

Description based on paratype female, 6 mm, AM P.84607.

Pereon. Gnathopod 1 subequal to gnathopod 2. Gnathopod 2 basis shorter than coxa; carpus subtriangular, length 0.9 times width, 0.6 times propodus length; propodus subrectangular, length 1.6 times width, palm transverse, defined by subquadrate corner and 1 robust seta; dactylus overreaching palm, apically acute, tapering evenly, posterior margin denticulate.

Remarks

In Sunamphitoe kanaka sp. nov. as well as S. fantome (Peart in Hughes and Lowry 2009), S. pelagica ( Milne-Edwards 1830) and S. tjibaoui sp. nov. the uropods 1 and 2 rami are similar in form, with rami narrow and lined with a few robust setae, while in S. sineplumosa Kim and Kim, 1991 , S. plumosa Stephensen, 1944 and S. graxon Freewater and Lowry, 1994 the uropods 1 and 2 rami are dissimilar with the outer ramus broad and outer margin lined with robust setae and the inner ramus is very narrow with a few robust setae. Sunamphitoe kanaka sp. nov. and S. fantome have the gnathopod 2 propodus palm extremely acute and undefined along the propodus posterior margin while in S. tjibaoui sp. nov the palm is subacute and defined by a rounded palm corner. In S. kanaka sp. nov. and S. fantome the gnathopod 2 propodus posterior margin is straight, while it is concave in S. pelagica . Sunamphitoe kanaka sp. nov. can be distinguished from S. fantome by the gnathopod 2 propodus posterodistal shelf is subacute, while subquadrate in S. fantome . Sunamphitoe kanaka sp. nov. is superficially similar to Peramphithoe orientalis ( Dana 1853) in the form of the gnathopods 1 and 2 propodus. However, the absence of a mandibular palp distinguished these taxa at the species and generic level.