Pseudharpinia bonhami, 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 : 503-508

Pseudharpinia bonhami sp. nov.

( Figs 1–5 )

Type material. Holotype: female, 2.8 mm length, dissected and drawn, MBT 188, 24°58’S, 45°26’W, 98 m depth, São Paulo state, 30 May 1971, UERJ 441 . Paratypes: 2 females, same data as for the holotype, UERJ 442; 1 female, MBT 219, 100 m depth, Rio de Janeiro state, 6 June 1971, UERJ 443.

Diagnosis. Head with dorsal keel. Rostrum entire. Antenna 2 peduncle article 1 with a subacute ensiform process. Mandible molar with 3 multicuspidate stout setae, right lacinia mobilis apically multicuspidate. Maxilla 1 inner plate setose apically. Maxilliped inner plate with 1 stout seta apically; palp article 3 with long setae apically, article 4 bearing elongated apical nail. Gnathopods 1–2 ischium anterior margin with row of setules. Pereopod 6 basis with a weak acute projection proximally. Pereopod 7 basis reaching half of merus, strongly dentate, with 6 acute stout spines posteroventrally; merus posterior margin produced distally. Epimeral plate 1 anterior and ventral margins covered with setules. Epimeral plate 3 posteroventral corner produced into a large hook. Uropods 1–2, rami continuously setose to apex. Telson short, apex rounded, with 3 setae apically on each lobe.

Description. Based on female holotype, UERJ 441.

Head. Antenna 1 peduncle article 1 about 1.4 × longer than wide, ventral margin distal lobe with brush setae, dorsal margin with 1 pappose seta distally; article 2 ventral margin with 6 long pappose setae; article 3 short, ventral margin with 1 short and 2 long setae, facial margin with 3 brush setae distally; primary flagellum 7-articulate; accessory flagellum 5-articulate. Antenna 2 peduncle article 2 short; article 3 ventral margin with 1 short and 4 long setae, dorsal margin with 1 seta distally; article 4 about 1.3 × longer than wide, ventral margin with long pappose setae and 6 brush setae, facial margin with 1 brush seta medially, 5 setae distally and a row of 10 setae extending to dorsal apex; article 5 about 0.6 × the length of article 4, ventral margin with long pappose setae, dorsal margin with 1 brush seta distally; flagellum 8-articulate. Upper lip and lower lip ordinary. Mandible incisor with 6 teeth, lacinia mobilis with 4 (left) – 6 (right) teeth, accessory setal row with 7 (left) – 6 (right) multicuspidate stout setae, palpar hump small; palp 3-articulate, article 1 short, article 2 with 6 (left) – 9 (right) setae medially, article 3 slightly shorter than article 2, apex oblique, with 7 (left) – 6 (right) medium to long setae. Maxilla 1 inner plate setose apically; outer plate with 9 stout setae apically, being 2 smooth; palp article 2 with 1 long and 2 stout pectinate setae apically, lateral and medial margins covered with setules. Maxilla 2 inner plate with 6 plumose setae extending from distomedial margin to apex, lateral and medial margins covered with setules; outer plate slightly longer than inner, setose apically, lateral margin covered with setules. Maxilliped inner plate with 6 plumose setae, outer plate with 9 papposerrate stout setae increasing in length to apex, lateral margin with 5 long plumose setae; palp article 2 medial margin moderately setose, article 3 moderately setose, article 4 about 3.4 × longer than wide, with 2 accessory setules.

Pereon. Gnathopod 1 coxa expanded anteroventrally, ventral margin with 19 long pappose setae; basis about 2.1 × longer than wide, anterior margin with 6 setae, posterior margin with 1 long plumose seta, posterodistal corner with 3 pappose setae; ischium short and subtriangular, posterior margin with 3 pappose setae; merus posterior margin with short to long simple and pappose setae; carpus anterior margin with 2 pappose setae distally, posterior margin with 3 setae, facial margin with a row of 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 reaching the palmar corner, outer margin with 1 short seta distally. Gnathopod 2 coxa subrectangular, ventral margin with 9 long pappose setae; basis about 2.8 × longer than wide, anterior margin with short to medium setae, posterior margin with 1 long plumose seta, posterodistal corner with 3 long pappose setae; ischium short and subrectangular, posterodistal corner with 6 setae, being 3 pappose; merus posterior margin with long pappose setae, facial margin with 1 seta; carpus anterior margin with 1 seta distally, posterior margin with 5 pappose 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 slightly longer than palm, outer margin with 1 short seta distally. Pereopod 3 coxa subrectangular, ventral margin with 8 long pappose setae; basis about 2.8 × longer than wide, anterior margin with 4 pappose setae, posterior margin with 2 long plumose setae, posterodistal corner with 5 long pappose setae; ischium short and subrectangular, posterodistal corner with a row of 6 long pappose setae; merus anterior margin produced distally, with 1 simple and 3 pappose setae, posterior margin moderately setose with pappose setae, facial margin with 6 setae distally; carpus anterior margin with 1 short seta distally, posterior margin with long pappose setae and stout setae progressively more robust and longer, facial margin with a row of 7 setae; propodus anterior margin with 2 setae distally, posterior margin with 6 long setae; dactylus stout, about 70% the length of propodus. Pereopod 4 coxa posterior margin strongly expanded, posterodorsal margin excavate, ventral margin with 11 pappose setae; basis about 3 × longer than wide, posterior margin with 2 long plumose setae, posterodistal corner with 1 pappose seta; ischium short and subrectangular, posterodistal corner with 3 pappose setae; merus anterior margin produced distally, with 4 pappose setae, posterior margin moderately setose with pappose setae; carpus anterior margin with 1 short seta distally, posterior margin with long pappose setae and stout setae progressively more robust and longer, facial margin with a row of 6 setae; propodus anterior margin with 2 setae distally, posterior margin with 5 long setae; dactylus stout, about 65% the length of propodus. Pereopod 5 coxa bilobate, posteroventral lobe produced, with 6 pappose setae; basis about 2.8 × longer than wide, anterior margin with long pappose setae, posterior margin with 1 plumose seta distally; ischium short, anterodistal corner with 4 pappose setae; merus anterior margin moderately setose, with posterior margin with 5 plumose setae; carpus anterior and posterior margins moderately and weakly setose respectively; propodus anterior and posterior margins moderately setose; dactylus about 60% the length of propodus. Pereopod 6 damaged, describable to merus only; coxa posterior margin with 1 short seta; basis about 1.5 × longer than wide, anterior margin with 3 stout and 14 long pappose setae, anterodistal corner with 3 pappose setae, posterior margin with pappose setae and a row of setules; ischium short and subrectangular, anterior margin with 4 pappose setae; merus anterior margin with 7 stout setae, posterior margin with 6 pappose setae proximally, 1 seta medially and 4 setae distally. Pereopod 7 coxa subtriangular, posterior margin with 1 short seta; basis about 1.1 × longer than wide, posteroventral margin expanded and strongly dentate, with 6 large spines posteroventrally, reaching half of merus, anterodistal corner with 1 stout seta and 2 plumose setae; ischium distofacial lobe produced, anterior margin with 1 stout and 4 long plumose setae; merus anterior margin with 1 short and 2 stout setae, anterodistal corner with 4 stout setae; carpus anterior and posterior margin weakly setose; propodus anterior margin with 3 setae, posterior margin with 1 seta distally; dactylus about 85% the length of propodus, inner margin with a row of setules distally.

Pleon. Epimeral plate 1 margins rounded, anterodistal angle with 1 plumose seta. Epimeral plate 2 anterior margin concave, ventral margin with 6 plumose setae, posterior margin convex, with 1 short seta. Epimeral plate 3 anteroventral corner expanded, ventral margin weakly concave, with 8 plumose setae, posteroventral corner strongly produced dorsally into a hook, posterior margin covered with setules. Urosomite 1 ventral margin with a tuft of setae. Uropod 1 peduncle about 3.1 × longer than wide, dorsomedial margin with 8 setae, dorsolateral margin with 3 setae; outer ramus 1.1 × longer than inner, dorsomedial margin with 5 setae, dorsolateral margin with 6 setae; inner ramus with 7 setae continuously to apex. Uropod 2 peduncle about 2.4 × longer than wide, dorsomedial margin with 4 setae, dorsolateral margin with 6 setae, being the distalmost stout; outer ramus slightly longer than inner, dorsomedial and dorsolateral margins with 8 setae each; inner ramus with 8 setae continuously to apex. Uropod 3 peduncle about 1.2 × longer than wide, dorsoapical margin with 7 setae; outer ramus slightly longer than inner, article 1 dorsomedial margin with 7 setae, ventrolateral margin with 3 setae, article 2 twice longer than wide, with 2 long setae apically. Telson about 85% cleft, lobes rounded with 3 setae each, dorsolateral margin with 3 plumose setae on each side.

Etymology. Named after John Bonham (1948–1980), drummer of the band Led Zeppelin, who inspired many generations of musicians with his outstanding talent and unique way of playing.

Type locality. São Paulo state coast (24°58’S, 45°26’W).

Remarks. Due to a notable character as the strong projections on the posteroventral margin of pereopod 7 basis, Pseudharpinia bonhami sp. nov. can be considered very similar to P. birjulini and P. latipes . However, the new species can be distinguished from the former by the following characters (characters of P. birjulini in parentheses): head with entire rostrum (excavate laterally); pereopod 7 basis with 6 large spines posteroventrally (4 large spines confined posteriorly), ventral margin not serrated (serrated); pleonites naked dorsally (setose dorsally); epimeral plates 1–2 posteroventral corner rounded (acute); epimeral plate 3 posteroventral corner strongly produced into a hook (weakly produced); telson lobes with 3 setae each (2 setae). Pseudharpinia bonhami sp. nov. differs from the latter species by the following characters (characters of P. latipes in parentheses): gnathopod 1 palm shorter than the posterior margin of propodus (longer); pereopod 7 basis with 6 large spines posteroventrally (7 spines confined mostly ventrally), reaching half of merus (reaching apex of merus), anterodistal corner weakly setose (strongly setose).

Geographic distribution. The species is known from the coast of the Brazilian states of Rio de Janeiro and São Paulo ( Fig 24 ).

Bathymetric range. 98–100 m depth.

Figures

FIGURE 1. Pseudharpinia bonhami sp. nov. Holotype, female, UERJ 441, São Paulo state coast (24°58’S, 45°26’W), Brazil. Scale bar: 1.0 mm.

FIGURE 2. Pseudharpinia bonhami sp. nov. Holotype, female, UERJ 441, São Paulo state coast (24°58’S, 45°26’W), Brazil. Scale bars: 0.5 mm for Hd; 0.2 mm for the remainings.

FIGURE 3. Pseudharpinia bonhami sp. nov. Holotype, female, UERJ 441, São Paulo state coast (24°58’S, 45°26’W), Brazil. Scale bars: 0.5 mm.

FIGURE 4. Pseudharpinia bonhami sp. nov. Holotype, female, UERJ 441, São Paulo state coast (24°58’S, 45°26’W), Brazil. Scale bars: 0.5 mm.

FIGURE 5. Pseudharpinia bonhami sp. nov. Holotype, female, UERJ 441, São Paulo state coast (24°58’S, 45°26’W), Brazil. Scale bars: 0.1 mm for T; 0.2 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.