Ampelisca cristianae, Souza-Filho & Souza & Valério-Berardo, 2009

Souza-Filho, J. F., Souza, A. M. T. & Valério-Berardo, M. T., 2009, Description of four new species of the genus Ampelisca (Amphipoda, Ampeliscidae) from the northeastern and southeastern coasts of Brazil and designation of a neotype for Ampelisca soleata Oliveira, 1954, Journal of Natural History 43 (37 - 38), pp. 2391-2423 : 2399-2404

Ampelisca cristianae sp. nov.

( Figures 5–7 )

Ampelisca aff. lobata Serejo et al., 2000: 500 , fig. 3.

Material examined

Holotype, female 9.0 mm, REVIZEE Score NE, # 85A-III, 3°28.2’S – 35°36’W, Fernando de Noronha Chain , N. Oc. Antares col., 22 m, gravel, 16 May 1998, MNRJ 21229 . Paratypes: REVIZEE Score NE, #59-III, 2°48′ S, 39°28.8′ W, N. Oc. Antares col., 61.8 m, bioclastic sand, 4 June 1998, MNRJ 21589 , 6 females . REVIZEE Score NE, #85A-III, 3°28.2′ S, 35°36′ W, Fernando de Noronha Chain , N. Oc. Antares col., 22 m, gravel, 16 May 1998, MNRJ 21590 , 16 females . REVIZEE Score NE #101, 4°1.2′ S, 35°51′ W, Banks of North Chain , N. Oc. Antares col., 12 December 2000, DOUFPE 13414 , 1 female . REVIZEE Score NE, #85A-III, 3°28.2′ S, 35°36′ W, Fernando de Noronha Chain , N. Oc. Antares col., 16 May 1998, DOUFPE 13415 , 10 females . REVIZEE Score Central , #22C, 20°30′ 38″ S, 35°50′ 16″ W, Victoria-Trindade seamount chain, N/ RB Astro Garoupa col., 59–110 m, calcareous nodules, 8 November 1997, MNRJ 18091 , 1 females . REVIZEE Score Central , #29C, 19°48′ 01″ S, 37°49′ 22″ W, off Espírito Santo State, N / RB Astro Garoupa col., 16 November 1997, 58 m, gravel, MNRJ 18093 , 2 females . REVIZEE Score Central , #32C, 20°40′ 24″ S, 37°42′ 37″ W, Victoria-Trindade seamount chain, N/ RB Astro Garoupa col., 54 m, gravel, 1 November 1997, MNRJ 18090 , 3 females . REVIZEE Score Central , #20C, 19°16′ 08″ S, 38°00′ 54″ W, off Espírito Santo State, N / RB Astro Garoupa col., 67 m, gravel, 22 November 1997, MNRJ 18088 , 1 female . REVIZEE Score Central , #17C, 18°34′ S, 38°04′ W, off Bahia State, N/ RB Astro Garoupa col., 55 m, calcareous nodules, 22 November 1997, MNRJ 18087 , 1 female . REVIZEE Score Central , #20C, 19°16′ 08″ S, 38°00′ 54″ W, gravel, off Espírito Santo State, N / RB Astro Garoupa col., 67 m, 22 November 1997, MNRJ 18088 , 1 female . REVIZEE Score Central , #29C, 19°48′ 01″ S, 37°49′ 22″ W, Victoria-Trindade seamount chain, N/ RB Astro Garoupa col., 58 m, gravel, 16 November 1997 MNRJ 13955 , 2 females . TAAF MD 55 , # 10 / DC 24, 20°41′ 83″ S, 37°49′ 55″ W, Victoria-Trindade seamount chain, N/ RB Marrion Dufresne col., 48 m, 13 May 1987, MNRJ 18040 , 37 females . TAAF MD 55 , # 17 / CP 31, 20°26′ S, 36°16′ W, Victoria-Trindade seamount chain, N.Oc. Marrion Dufresne col., 60 m, 15 May 1987, MNRJ 18036 , 3 females .

Etymology

Named in honour of Dr Cristiane S. Serejo, in recognition of her significant contribution to amphipod taxonomic studies.

Diagnosis

Head with anteroventral margin oblique. Antenna 1 not reaching end of article 4 of antenna 2 peduncle. Antenna 2 subequal in length to body length. Pereopod 7 basis posterior margin rounded with few crenulations at inset plumose setae, reaching to end of distal margin of merus; merus posterior lobe weakly drawn out; propodus longer than carpus (1.2 times), not stout, length twice breadth. Epimeron 3 posteroventral corner quadrate. Urosomite 1 with saddle-shaped dorsal carina. Uropod 1 with one large robust seta on distal margin. Uropod 3 inner ramus longer and stouter than outer, with four robust setae along outer margin; inner margins of both rami with plumose setae. Telson with each lobe notched and pointed at apex, each notch bearing one plumose seta and one robust seta, dorsal surface with one pair of robust setae.

Description

Holotype, female 9.0 mm. Head ( Figure 5 ) with anteroventral margin oblique, shorter than the first three body segments combined. Antenna 1 ( Figure 5 ) not reaching end of article 4 of antenna 2 peduncle, peduncular article 2 3.3 times longer than article 3, with setae on ventral margin; flagellum longer than peduncle, with 15 articles. Antenna 2 ( Figure 5 ) subequal in length to body length, peduncular article 4 1.1 times longer than article 5; flagellum with 22 articles.

Mandible ( Figure 5 ) with nine robust setae in accessory setal row; mandibular palp article 2 elongate and with a row of setae on inner margin, article 3 0.6 times article 2, with medial and apical setae. Maxilla 1 ( Figure 5 ) inner plate with one apical pectinate seta; outer plate with 10 setal-teeth; palp article 2 provided with two distal cusps, accompanied by five apical robust setae and subapical setae. Maxilliped ( Figure 5 ) inner plate rectangular distally with apical row of simple setae and 2 apical robust setae; outer plate reaching to end of the palp article 2, bearing 11 chiselshaped robust setae, palp article 4 inserted at mid-length of the article 3. Upper lip, lower lip and maxilla 2 ( Figure 5 ) with basic characters for the genus.

Coxae 1–4 ( Figure 6 ) longer than broad, coxae 1 and 2 with a notch on posteroventral corners and with a row of plumose setae on ventral margins. Gnathopod 1 ( Figure 6 ) shorter than gnathopod 2; basis inflated mid-distally with one row of simple setae on both margins; merus with setae on posterior margin; carpus subequal in length to propodus, both articles with pectinate setae and simple setae on posterior margins; dactylus slightly curved, with four setules along inferior margin. Gnathopod 2 ( Figure 6 ) basis with long simple setae on both margins; carpus longer than propodus (1.4 times), both articles with elongate simple setae on posterior margins; dactylus short, with four setules on inferior margin. Pereopods 3 and 4 ( Figure 6 ) similar in shape but fourth is more setose than third, both with dactyli subequal in length to carpus and propodus combined. Pereopod 3 ( Figure 6 ) with merus with plumose setae along one-quarter of posterior margin; carpus with plumose setae on posterodistal margin; propodus with setae on anterodistal corner. Pereopod 4 ( Figure 6 ) ischium with long plumose setae on posterior margin; merus length 2.9 times breadth, both margins with long plumose setae; propodus with simple setae on anterodistal margin. Pereopod 5 ( Figure 6 ) basis subovoid; carpus longer than propodus (1.1 times) drawn out posterodistally, with two sets of comb robust setae along posterior margin, bearing three long robust setae and two short robust setae on posterodistal corner, anterior margin with a row of six simple long setae; dactylus short and with two apical cusps. Pereopod 6 ( Figure 6 ) basis subovoid, with three plumose setae and four robust setae on anterior margin; carpus longer than propodus (1.2 times), posterodistal corner produced, bearing two long robust and five short robust setae, with two sets of comb robust setae along posterior margin, anterior margin with a row of simple setae; dactylus short and with two apical cusps. Pereopod 7 ( Figure 7 ) basis posterior margin rounded with few crenulations at inset plumose setae, reaching to end of distal margin of merus; ischium and merus subequal in length; merus posterior lobe weakly drawn out, with plumose setae, anterodistal corner with one robust seta; carpus anterodistal and posterodistal corners with three and two robust setae, respectively; propodus longer than carpus (1.2 times), not stout, length twice breadth, with three robust setae on anterodistal corner; dactylus shorter than propodus (0.7 times) and with one simple seta on posterior margin.

Epimeron 3 ( Figure 5 ) posteroventral corner quadrate. Urosomite 1 ( Figure 5 ) with saddle-shaped dorsal carina. Uropod 1( Figures 5 and 7 ) reaching to end of uropod 2 peduncle; peduncle longer than rami (1.2 times), with three robust setae on dorsal margin, with one large robust seta on distal margin; rami subequal in length, inner ramus with three robust setae on outer margin, outer ramus with three short robust setae on outer margin. Uropod 2 ( Figure 7 ) peduncle longer than rami; rami subequal in length, both with robust setae on dorsal margins. Uropod 3 ( Figures 5 and 7 ) exceeding apex of uropods 1 and 2, peduncle shorter than rami, inner ramus longer and stouter than outer, with four robust setae along outer margin; inner margins of both rami with plumose setae; outer ramus notched apically and with two apical setae. Telson ( Figure 7 ) stout, deeply cleft (0.7 times), each lobe notched and pointed at apex, each notch bearing one plumose seta and one robust seta, dorsal surface with one pair of robust setae.

Remarks

Ampelisca cristianae sp. nov. is closer to A. lobata Holmes, 1908 from the eastern Pacific coast and to A. burkei, Barnard and Thomas, 1989 from the Florida coast. It was also recognized from the Brazilian coast by Valério-Berardo and Wakabara (2006) by the shape of the head, urosomite 1, uropod 3 and telson. However, two characters distinguished A. cristianae sp. nov. from these other species: antenna 1 is distinctly shorter than peduncle of antenna 2 and peduncle of uropod 1 has a large robust seta on the outer distal margin. Moreover, comparing A. cristianae . sp. nov. with A. burkei from the Brazilian coast, we noticed that pereopod 7 has a different shape: in the the former species there are little notches on the basis of the posterior margin, merus is expanded to nearly the middle of carpus and propodus is 1.3 times longer than carpus. Other differences observed are: uropod 1 not reaching end of uropod 2 and uropod 3 with plumose setae on inner margins of both rami. Serejo et al. (2000) draw the outer ramus of uropod 1 of A. aff. lobata without robust setae on outer margin. However, we have examined the same specimens and we have herein noted that these setae were omitted from their drawings.

Geographic distribution

Brazil: off Ceará, Bahia, and Espírito Santo States, Banks of Fernando de Noronha , North and Victoria-Trindade Chain .

Figures

Figure 5. Ampelisca cristianae sp. nov., holotype, female 9.0 mm, REVIZEE Score NE, #85A-III, (2°48′ S,39°28.8′ W), N. Oc. Antares, 16 May 1998, MNRJ 21229. Scale bar 0.1 mm.

Figure 6. Ampelisca cristianae sp. nov., holotype, female 9.0 mm, REVIZEE Score NE, #85A-III, (2°48′ S,39°28.8′ W), N. Oc. Antares, 16 May 1998, MNRJ 21229. Scale bar 0.2 mm.

Figure 7. Ampelisca cristianae sp. nov., holotype, female 9.0 mm, REVIZEE Score NE, #85A-III, (2°48′ S,39°28.8′ W), N. Oc. Antares, 16 May 1998, MNRJ 21229. Scale bar 0.2 mm.