A new species of Ledoyerella, L. kunensis sp. nov. (Amphipoda, Senticaudata, Kamakidae) from South West Africa Author Zettler, Michael L. Author Myers, Alan text Zootaxa 2018 2018-07-23 4450 1 142 150 journal article 29326 10.11646/zootaxa.4450.1.11 27637276-6ce8-4b6c-8688-36d04bb47616 1175-5326 1444560 AD9D63C6-6E26-4157-8BD5-9FBE46176B11 Ledoyerella kunensis sp. nov. ( Figs 1–5 ) Type material. Holotype : one male, 6.7 mm ( ZMB 31313) ( Stn. BE 2; Namibia , Skeleton Coast ; water depth 32 m ; grab sampling; 18.191°S ; 11.841°E ; salinity at bottom 35.4 psu, temperature at bottom 14.3°C, oxygen 1.46 ml/l, collected 12 May 2004 ) . Paratype : one female, 5.5 mm ( ZMB 31314) (data same as holotype) . Non-type material ( ZMB 31315) ( Stn. BE 1; Namibia , Skeleton Coast; water depth 42 m ; grab sampling; 18.385°S ; 11.922°E ; salinity at bottom 35.3 psu, temperature at bottom 13.4°C, oxygen 0.12 ml/l, collected 12 May 2004 ). Additional material, see Table 1 . TABLE 1. Sampling sites of Ledoyerella kunensis sp. nov. along the Angolan and Namibian coast from North to South. (*=type locality)
Station Country Latitude (S) Longitude (E) Depth (m) T°C Date of sampling Number of specimens
Be71 Angola 9.435 12.831 102 15.3 0 2 August 2011 2
Be65 Angola 9.435 12.999 42 16.0 0 2 August 2011 52
SU4 Angola 10.490 13.423 60 15.7 0 1 August 2011 4
SU5 Angola 10.508 13.577 28 17.1 0 1 August 2011 31
45 Angola 12.088 13.701 19 18.1 23 May 2004 2
LO4 Angola 12.338 13.439 92 15.1 31 July 2011 1
BM5 Angola 13.991 12.362 48 16.5 31 July 2011 1
Na5 Angola 15.096 12.105 62 16.1 30 July 2011 5
BE2* Namibia 18.191 11.841 32 14.3 12 May 2004 39
BE1 Namibia 18.385 11.922 42 13.4 12 May 2004 82
Nam005 Namibia 20.223 12.629 154 12.5 24 August 2011 3
Nam006 Namibia 20.281 12.560 204 11.9 24 August 2011 8
Type locality. Namibia (Province Kunene ) about 100 km south of the River Kunene mouth, off the Skeleton Coast in 32 m water depth.
Etymology. Named for the River Kunene at the border between Angola and Namibia in the waters off which the material was collected. Description . Based on male holotype , 6.7 mm . FIGURE 1. Ledoyerella kunensis sp. nov. , lateral view of holotype male (6.7 mm). Head , Head ocular lobes extended forward; eye oval, of medium size, almost entirely situated in the ocular lobe; anteroventral margin deeply excavated. Antenna 1 scarcely more than one third body length; peduncular articles 1–3 in the length ratios 1:1:0.6; flagellum about two thirds length of peduncle with 12 articles; accessory flagellum with two long articles and a rudimentary terminal article. Antenna 2 longer than antenna 1; peduncular articles 4 and 5 subequal in length; flagellum only a little longer than the combined length of peduncular articles 4 and 5, with 19 articles. Labrum without epistome. Mandible molar of moderate size, triturative; left lacinia mobilis 4-dentate, right lacinia mobilis 3-dentate; palp article 2 longer than article 3; article 3 subovate with long mostly distal and subdistal setae. Maxilla 1 inner plate with two unequal distal setae and many fine setae along medial margin. Maxilla 2 lacking oblique setal row. Labium mandibular projections blunt. Maxilliped palp article 2 about twice as long as broad, article 4 about two thirds length of article 3. FIGURE 2. Ledoyerella kunensis sp. nov. , antennae and mouthparts of holotype male. FIGURE 3. Ledoyerella kunensis sp. nov. , gnathopods, coxal plates, epimeral plates and pereopods 3 and 4 of holotype male. FIGURE 4. Ledoyerella kunensis sp. nov. , pereopods 5 to 7, uropods and telson of holotype male. Pereon . Sternal processes absent. Gnathopod 1 coxa anteriorly produced, rounded; basis immensely swollen, posterodistal margin with three groups of long setae; carpus enlarged, subovoid, two thirds as broad as long; propodus about two thirds length of carpus, the posterior margin weakly crenulate, palm produced forward anterodistally into rounded lobe; dactylus stout, posterior margin with spines, overlapping palm. Gnathopod 2 coxa larger than that of gnathopod 1, deeper than broad, a little less deep that coxa 3; basis immensely swollen, anterior margin weakly concave distally; carpus parallel-sided; propodus about two thirds length of carpus, posterodistal margin produced into stout, parallel-sided round ending projection; palm irregular with shallow sinus, and thick, distally rounded, subproximal robust seta; dactylus stout, overlapping palm. Pereopods 3–4 slender, dactylus about half length of propodus. Pereopods 5–7 in the length ratios 1:1.4:1.7; basis only weakly expanded. FIGURE 5. Ledoyerella kunensis sp. nov. , gnathopods and pereopod 3 of paratype female (5.5 mm). Pleon . Epimeral plates 1–3 rounded. Uropod 1 peduncle longer than rami with strong distal inter-ramal spine; inner ramus longer than outer. Uropod 2 peduncle subequal in length with outer ramus, inner ramus longer than outer. Uropod 3 rami longer than peduncle, outer ramus with small second article, both rami with distal robust setae, lacking slender setae. Telson with each lobe bearing a strong robust seta. Female (sexually dimorphic characters). Gnathopod 1 slender; basis parallel-sided, nearly three times as long as broad; carpus longer than propodus; propodus palm very oblique, with subproximal robust seta; dactylus fitting palm. Gnathopod 2 basis slender, parallel-sided about twice as long as broad; carpus and propodus stout, subequal in length, palm oblique, with subproximal robust seta; dactylus slightly overlapping palm. Habitat. This new species occurred in water depths between 19 and 204 m on sandy and muddy sediments often with shell debris. The salinity ranged between 35.3 and 35.7 psu, the oxygen content in bottom water varied between 0.12 and 2.3 ml/l. The co-occurring temperatures were between 13 and 17°C. Distribution. Currently known only from the coasts of Angola and Namibia . Remarks. Ledoyerella kunensis sp. nov. is most similar to L. caputphotis , but differs in the form of the male gnathopods. In L. kunensis sp. nov. gnathopod 1 has a short propodus with palmar lobe, whereas in L. caputphotis the propodus is long, with an oblique palm. The gnathopod 2 has a slender propodus with strong forward projecting palmar spine in L. kunensis sp. nov. , whereas in L. caputphotis the propodus is broad, with a weak, short palmar spine. In L kunensi s sp. nov. , antenna 1 is shorter than antenna 2 (longer than antenna 2 in L. caputphotis ), In addition the uropod 2 peduncle of L. caputphotis bears a long distal inter-ramal spine, lacking in L. kunensis sp. nov. and L. caputphotis has long slender terminal setae on the outer ramus of uropod 3 that are absent in L. kunensis sp. nov.