Pseudharpinia pagei, Andrade & Senna, 2020

Andrade, Luiz F. & Senna, André R., 2020, Four new species of Pseudharpinia Schellenberg, 1931 (Crustacea: Amphipoda Phoxocephalidae) from southwestern Atlantic and new records of P. tupinamba Senna & Souza-Filho, 2011, Zootaxa 4763 (4), pp. 501-537 : 517-523

Pseudharpinia pagei sp. nov.

( Figs 13–17 )

Type material. Holotype: female , 4.8 mm length, dissected and drawn, MBT 144, 23°53’S, 42°28’W, 500 m depth, Rio de Janeiro state, 3 September 1970, UERJ 454 .

Diagnosis. Head with ventrolateral lines. Rostrum entire. Antenna 1 peduncle article 3 very short; primary flagellum article 1 stout, about twice longer than wide. Antenna 2 peduncle with a narrow ensiform process. Mandible molar with 4 pectinate setae, lacinia mobilis stout and crown-shaped. Maxilliped inner plate with 1 stout seta apically; palp article 4 bearing medium apical nail. Gnathopod 1 palm sinuous, palmar hump slightly serrate. Gna- thopod 2 carpus almost cryptic; palm excavate in “V” shape, palmar hump slightly serrate. Pereopod 6 basis facial margin with a vertical row of setules. Pereopod 7 basis expanded posteroventrally, reaching the apex of ischium, anterodistal angle with a row of plumose setae. Epimeral plate 1 subquadrate. Epimeral plate 3 posteroventral corner produced into a medium hook. Uropod 1 peduncle dorsomedial margin with a stout curved seta distally. Telson short, apex rounded, with 1 stout seta apically on each lobe.

Description. Based on female holotype, UERJ 454.

Head. Antenna 1 peduncle article 1 about 1.5 × longer than wide, ventral margin with brush setae distally, dorsal margin with 1 long seta distally; article 2 ventral margin setose distally with pappose setae, dorsal margin with 3 setae distally; article 3 ventral margin with 1 short and 1 long seta, dorsal margin with 1 seta; primary flagellum 7-articulate; accessory flagellum 5-articulate. Antenna 2 peduncle article 2 rounded; article 3 ventral margin with 1 seta, dorsal margin with 1 seta distally, facial margin with a row of 6 pappose setae; article 4 about 1.2 × longer than wide, ventral margin with medium to long pappose setae, dorsal margin with 3 setae distally, facial margin with 1 brush seta medially and a row of 7 long setae extending to dorsal apex; article 5 about 0.6 × the length of article 4, ventral margin with 7 pappose setae, dorsal margin with 3 setae distally; flagellum 7-articulate. Upper lip and lower lip ordinary. Mandible incisor with 5 (left) – 3 (right) teeth, lacinia mobilis with 4 (left) – 2 (right) teeth, accessory setal row with 8 (left) – 7 (right) stout multicuspidate setae, palpar hump small; palp 3-articulate, article 1 short, article 2 weakly setose, with setae on medial margin only, article 3 slightly longer than article 2, apex oblique, with setae extending from medial margin to apex. Maxilla 1 inner plate with 4 plumose setae; outer plate with 7 stout multicuspidate and 2 smooth setae; palp article 2 medial and lateral margins with setules, apical margin with 2 stout setae, distomedial margin with 2 stout and 5 slender setae. Maxilla 2 inner plate subequal to outer, medial margin with setules and a row of 10 plumose setae extending to apical margin; outer plate setose apically, lateral margin covered with setules. Maxilliped inner plate with 5 plumose setae; outer plate with 9 bipectinate stout setae progressively increasing in length to apex, lateral margin with 4 long setae; palp article 2 medial margin moderately setose, article 3 magins with medium to long setae, facial margin with 3 setae, article 4 about 3.7 × longer than wide, with 1 accessory seta.

Pereon. Gnathopod 1 coxa weakly expanded anteroventrally, ventral margin with 10 pappose setae; basis about 2.5 × longer than wide, anterior margin with 5 pappose setae, posterodistal corner with 3 setae, facial margin with 3 setae; ischium short and subquadrate, posterodistal corner with 4 setae, being 2 pappose; merus posterior margin with 9 setae; carpus posterior margin with 4 setae; propodus weakly setose, anterodistal margin with a tuft of setae, posterior margin with 1 stout seta defining palm; palm covered with setules on its margin, palmar hump short; dactylus slightly shorter than palm, outer margin with 1 short seta medially. Gnathopod 2 coxa subrectangular, ventral margin with 6 pappose setae; basis about 3 × longer than wide, anterior margin with 11 setae, posterior margin with 4 setae, posterodistal corner with 5 long pappose setae; ischium short and subtriangular, posterodistal corner with a row of 7 pappose setae extending to facial margin; merus posterior margin with 10 setae, being 3 pappose, facial margin with a row of 5 setae distally; carpus posterior margin with 5 setae; propodus weakly setose, anterodistal margin with a tuft of setae, posterior margin with 1 stout seta defining palm; palm covered with setules on its margin, palmar hump large; dactylus subequal to palm, outer margin with a leaf-shaped seta distally. Pereopod 3 coxa subrectangular, ventral margin with 8 pappose setae; basis about 2.4 × longer than wide, anterior margin with 12 setae, posterior margin with 3 long setae, posterodistal corner with 5 long pappose setae, facial margin with 4 setae; ischium short and subrectangular, posterodistal corner with a row of 7 pappose setae extending to facial margin; merus anterior margin with 7 setae distally, posterior margin moderately setose, facial margin with 2 rows of 3 setae; carpus posterior margin with long slender and stout setae progressively more robust and longer, facial margin with a row of 4 setae; propodus anterior margin with 2 setae distally, posterior margin with 8 setae extending to facial margin apex; dactylus about 65% the length of propodus. Pereopod 4 coxa posterior margin strongly expanded, posterodorsal margin excavate, ventral margin with 11 plumose setae; remaining articles are very similar to pereopod 3, differing only by some arrangements of setae. Pereopod 5 coxa bilobate, posteroventral lobe produced, with 3 pappose setae; basis about 2.1 × longer than wide, anterior margin with 7 setae, anterodistal corner with 2 long pappose setae, posterodistal corner with 1 plumose seta; ischium short and subquadrate, anterodistal angle with 4 pappose setae; merus anterior margin moderately setose, posterior margin weakly setose, facial margin with 3 stout setae distally; carpus margins moderately setose with long pappose and stout setae; propodus margins moderately setose, anterior margin with 1 stout seta distally; dactylus about 90% the length of propodus. Pereopod 6 coxa bilobate and naked; basis about 1.3 × longer than wide, anterior margin with slender setae and 2 stout setae medially, anterodistal corner with 1 long and 2 stout setae; ischium short and subrectangular, anterodistal corner with 2 stout and 2 long setae; merus anterior margin with 4 sets of stout setae (1-3-3-3), posterior margin with 5 setae, being 3 pappose and a row of 3 stout and 3 simple setae distally; carpus anterior margin with 3 sets of stout setae (3-2-1) anterior margin with 1 stout and 1 short seta distally; propodus and dactylus missin. Pereopod 7 coxa subtriangular, posteroventral margin with 2 short setae; basis slightly wider than long, posteroventral margin expanded, serrate posteroventrally, almost reaching the apex of merus, anterodistal corner with a row of 9 plumose setae; ischium distofacial lobe produced, anterior margin with 9 setae, being 4 stout; merus anterior margin with 2 setae, anterodistal angle with 2 stout and 2 simple setae, posterodistal corner produced, with 5 setae; carpus anterior margin with 3 setae, anterodistal corner with 4 setae, posterodistal corner with 3 setae; propodus anterior margin with 3 setae, posterodistal corner with 2 setae; dactylus about 1.2 × longer than propodus.

Pleon. Epimeral plate 1 anterior margin concave, ventral margin almost straight, posterior margin convex, with 1 short seta. Epimeral plate 2 anterior margin concave, ventral margin with 2 plumose setae, facial margin with 1 plumose seta. Epimeral plate 3 anteroventral corner with 1 seta, ventral margin with 4 setae, posteroventral corner produced into a medium hook, posterior margin covered with setules, with 2 short setae. Uropod 1 peduncle about 2.8 × longer than wide, dorsomedial margin with 5 setae and 1 stout curved seta distally, dorsolateral margin with 3 setae, being the distalmost stout; outer ramus slightly longer than inner, dorsolateral margin with 6 setae; inner ramus dorsomedial margin with 4 setae. Uropod 2 peduncle 2.4 × longer than wide, dorsomedial margin with a row of 6 setae extending to dorsolateral apex, being the distalmost stout; outer ramus slightly longer than inner, with 10 setae continuously to apex; inner ramus dorsomedial margin with 3 setae, apical margin with 1 seta. Uropod 3 missing. Telson about 80% cleft, with an acclivity and 1 stout seta on each lobe, dorsolateral margins with 1 plumose seta.

Etymology. Named after Jimmy Page, artistic name of James Patrick Page, guitarist and founder of the band Led Zeppelin, considered one of the most influential guitarists in the world, inspiring not only musicians but we both authors during scientific discussions.

Type locality. Rio de Janeiro state coast (23°53’S, 42°28’W).

Remarks. Pseudharpinia pagei sp. nov. presents some resemblance to the Brazilian species P. berardo due to the following characters: antenna 1 peduncle article 3 short, primary flagellum article 1 stout; maxilla 1 inner plate with 4 plumose setae; gnathopod 1 palm sinuous; gnathopods 1–2 carpus short and almost cryptic; pereopod 7 basis wider than long, anteroventral corner with a row of plumose setae. However, the new species can be distinguished from P. berardo by the following characters (characters of P. berardo in parentheses): head with ventrolateral line present (absent); mandible incisors with 3 or 5 teeth (2 or 3), molar with 4 pectinate setae (2 setae); gnathopods 1–2 palmar hump distinct and slightly serrate (smooth); pereopod 6 basis facial margin with a vertical row of setules (without); pereopod 7 basis expanded posteroventrally almost reaching the apex of merus (reaching half of ischium), ischium distofacial lobe well developed (poorly developed); epimeral plate 3 posteroventral corner produced into a medium hook (produced into a larger hook), posterior margin covered with setules (without setules); telson with 1 stout seta on each lobe (2 setae), dorsolateral margins with 1 plumose seta (2 setae, being 1 plumose).

Geographic distribution. The species is known only from the type locality, Rio de Janeiro state coast ( Fig 24 ).

Bathymetric range. 500 m depth.

Figures

FIGURE 13. Pseudharpinia pagei sp. nov. Holotype, female, UERJ 454, Rio de Janeiro state coast (23°53’S, 42°28’W), Brazil. Scale bar: 2.0 mm.

FIGURE 14. Pseudharpinia pagei sp. nov. Holotype, female, UERJ 454, Rio de Janeiro state coast (23°53’S, 42°28’W), Brazil. Scale bars: 0.5 mm for Hd; 0.1 mm for Mp and Mx1–2; 0.3 mm for the remainings.

FIGURE 15. Pseudharpinia pagei sp. nov. Holotype, female, UERJ 454, Rio de Janeiro state coast (23°53’S, 42°28’W), Brazil. Scale bars: 0.3 mm.

FIGURE 16. Pseudharpinia pagei sp. nov. Holotype, female, UERJ 454, Rio de Janeiro state coast (23°53’S, 42°28’W), Brazil. Scale bars: 0.3 mm.

FIGURE 17. Pseudharpinia pagei sp. nov. Holotype, female, UERJ 454, Rio de Janeiro state coast (23°53’S, 42°28’W), Brazil. Scale bars: 0.1 mm for T; 0.3 mm for the remainings.

FIGURE 24. Distribution of P. bonhami sp. nov., P. jonesyi sp. nov., P. pagei sp. nov. and P. planti sp. nov. Diamond: records for P. bonhami sp. nov. and P. jonesyi sp. nov.; Star: records for P. jonesyi sp. nov.; Triangle: record for P. pagei sp. nov.; Circle: record for P. planti sp. nov. and P. jonesyi sp. nov.