Pseudharpinia berardo, Senna, 2010

Senna, André R., 2010, A new genus and five new species of Phoxocephalidae (Crustacea: Amphipoda) from the south-east Brazilian deep sea, Journal of Natural History 44 (33 - 34), pp. 2075-2118 : 2101-2108

Pseudharpinia berardo sp. nov.

( Figures 13–16 )

Material examined

Holotype: one female, 5.5 mm, Petrobras , Campos Basin, N / Rb Astro Garoupa, boxcorer, #33, 22°35′25″ S, 40°15′31″ W, 900 m depth, 18 May 2003, MNRJ 19201 .

Etymology

The species name is a noun in apposition, and it honours Dr Maria Teresa Valério Berardo, from the Instituto Oceanográfico – Universidade de São Paulo, for her important contribution to Brazilian amphipod taxonomy.

Diagnosis

Antenna 1, article 1 dorsally setulose; article 2, ventral margin with five long plumose setae. Antenna 2 article 4, facial row of setae with four simple setae and a displaced papose stout seta, ventral margin with seven long plumose setae. Mandible, incisors with two to three spines weakly defined, accessory setal row with five to six pectinate setae; right lacinia mobilis apically multi-cuspidate; palp article 2 ventral margin with a mid-length pair of setae. Maxilla 1, inner plate with four small plumose apical setae. Gnathopod 1, coxa ventral margin with 10 plumose setae; propodus about 2.3 times longer than broad, palm about twice as long as posterior margin. Gnathopod 2, coxa ventral margin with seven plumose setae, increasing in length posteriorly; propodus about 1.9 times longer than broad, palm about twice as long as posterior margin. Pereopod 3 carpus, posterior margin with seven long stout setae. Pereopod 6 basis, anterior margin weakly setose distally, posterior margin straight; merus, posteroventral corner with one long stout seta; carpus, posteroventral corner with two long stout setae. Pereopod 7, dactyl thin, elongated, about 1.4 times longer than propodus. Epimeral plate 3, ventral margin with five slender setae. Uropod 1, dorsoapical corner with two stout setae. Uropod 3, inner ramus about 1.8 times longer than peduncle; outer ramus article 2 about 0.4 times as long as article 1, bearing one apical long slender seta. Telson with two subapical small slender setae, and two dorsolateral setae, one simple and one papose, on each lobe.

Description

Head, rostrum well developed, unconstricted; dorsal keel present; eyes absent. Antenna 1, article 1 dorsally setulose, anterodorsal corner with one slender seta, anteroventral corner with one simple and three small plumose setae, 1.3 times longer than broad; article 2 about as long as wide, anterodorsal corner with one small slender seta, ventral margin with five long plumose setae; article 3 shortened, about 0.7 times as long as wide, without setae; flagellum with six articulations; accessory flagellum with six articulations. Antenna 2, article 1 ensiform; article 3, anterodorsal corner with one slender seta, anteroventral corner with four slender setae; article 4, facial row of setae with four simple setae and a displaced papose stout seta, ventral margin with seven long plumose setae; article 5 slender, ventrally setose; flagellum with six articulations. Mandible, incisors with two or three spines weakly defined, molar not triturative, with two apical slender setae, accessory setal row with five or six pectinate setae, hump of palp small; right lacinia mobilis apically multi-cuspidate; palp with three articulations, article 1 small, about as long as wide, article 2 elongated, five times longer than broad, 1.3 times longer than article 3, ventral margin with a midlength pair of setae, ventroapical corner with three slender setae, article 3 about five times longer than broad, apically and ventrodistally setose. Maxilla 1, inner plate with four small plumose apical setae; outer plate, with two rows of stout setae; palp bi-articulated, article 2 apically setose, with facial setules. Maxilla 2, inner plate slightly shorter than outer plate, apical margin with seven plumose setae, inner margin setulose; outer plate, apical margin with nine slender setae, outer and inner margins setulose. Maxilliped, inner plate small, with three small plumose setae; outer plate well developed, apical and inner margins armed with curved simple setae; palp with four articulations, article 2 about three times longer than broad, about twice as long as article 3, inner margin armed with simple setae, article 3, inner margin with four slender setae, lateroapical margin with five slender setae; article 4 slender, slightly elongated, without setae, apical nail present.

Gnathopod 1 small, coxa expanded anteriorly, anterior and posterior margins somewhat divergent, anterior margin almost straight, without setae, posterior margin straight without setae, ventral margin with 10 plumose setae; basis, about 2.5 times longer than broad, posterior margin with two long slender setae, posteroventral corner with two slender setae; merus, posterior margin with four pairs of slender setae distally; carpus short, free, with weak eusirid attachment; propodus ovato-rectangular, weakly elongated, about 2.3 times longer than broad, anterior margin without setae, anterodistal corner with three long slender setae, palm extremely acute, sinuous, about twice as long as posterior margin, defined by a lateral stout seta; dactyl curved, reaching the palmar corner, outer margin with one small setule. Gnathopod 2 slightly larger than gnathopod 1, coxa subrectangular, about 1.5 times longer than broad, anterior margin almost straight, without setae, posterior margin straight, without setae, ventral margin with seven plumose setae, increasing in length posteriorly; basis, about three times longer than broad, posterior margin with one long slender seta, posteroventral corner with six long slender setae; merus, posterodistal corner produced, posterior margin with 10 long slender setae; carpus short, free, with weak eusirid attachment; propodus ovatorectangular, weakly elongated, about 1.9 times longer than broad, anterior margin without setae, anterodistal corner with three long slender setae, palm acute, sinuous, about twice as long as posterior margin, defined by a lateral stout seta; dactyl curved, reaching the palmar corner, outer margin with one small setule. Pereopod 3, coxa subrectangular, about 1.7 times longer than broad, anterior margin almost straight, posterior margin without setae, ventral margin with six posteroventral plumose setae, increasing in length posteriorly; basis, about 2.5 times longer than broad, anterior margin without setae, posterior margin with two long plumose setae, posteroventral corner with four plumose setae; ischium with one row of six plumose setae posterodistally; merus, carpus and propodus, length ratio 9: 4: 6; merus, posterior margin with five rows of plumose setae (1-1-2-2-3) and three lateral rows of plumose setae (3-2-3); carpus, posterior margin with seven long stout setae and one lateral row of five slender setae; propodus, posterior margin with four slender setae distally; dactyl about 0.8 times as long as propodus. Pereopod 4, coxa slightly wider than long, anterior margin almost straight, posterior margin broadly rounded, ventral margin with two anteroventral plumose setae, posterodorsal margin excavate; basis, about twice as long as broad, anterior margin without setae, posterior margin with three long slender setae, posteroventral corner with two plumose setae; merus, carpus and propodus, length ratio 11: 4: 6; merus, posterior margin with long plumose setae; carpus, posterior margin with long plumose setae and one lateral row of long slender setae; propodus, posteroventral corner with three slender setae; dactyl about 0.8 times as long as propodus. Pereopod 5, coxa bilobate, anteroventral lobe with three plumose setae and one setule; basis slender, about twice as long as broad, anteroventral corner with one plumose seta, posterior margin with three plumose setae, posteroventral corner with three long plumose setae; ischium with two plumose setae posterodistally; merus, carpus and propodus, length ratio 10: 9: 12; merus, anterior margin with two plumose setae, anteroventral corner with two plumose setae, posterior margin with three rows of plumose setae (2-3-3); carpus, anterior margin densely setose, posterior margin with three rows of plumose setae (2-2-4); propodus, anterior margin densely setose, posterior margin with six plumose setae continuously to apex; dactyl about 0.8 times as long as propodus. Pereopod 6, coxa small, slightly expanded posteroventrally, without setae; basis without posterior expansion, about 1.5 times longer than broad, anterior margin convex, weakly setose distally, posterior margin straight, without setae; merus, carpus and propodus, length ratio 6: 6: 7; merus, about 2.2 times longer than broad, anterior margin with three slender setae and three setules, anteroventral corner with three slender setae, posterior margin with three slender setae, posteroventral corner with one slender seta and one long stout seta; carpus, about 2.4 times longer than broad, anterior margin with five rows of slender setae (2-3-2-3-3), posteroventral corner with two long stout setae; propodus thin, about six times longer than broad, anterior margin with eight slender setae, apical margin with six slender setae, posterior margin with one slender seta; dactyl thin, about 0.7 times as long as propodus. Pereopod 7, coxa slightly expanded posteroventrally; basis, strongly expanded posteriorly, anterior margin with two slender setae proximally and five long plumose setae distally, posterior margin strongly serrate, with one small slender seta on each notch; ischium enlarged, anterior margin setose; merus, carpus and propodus, length ratio 5: 4: 4; merus, about 1.4 times longer than broad, anterior margin with two pairs of slender setae, posteroventral corner with three slender setae; carpus, about 1.6 times longer than broad, anterior margin with two pairs of slender setae, posteroventral corner with two slender setae; propodus, about 2.7 times longer than broad, anteroventral corner with one slender seta, posteroventral corner with two slender setae; dactyl thin, elongated, about 1.4 times longer than propodus.

Epimeral plate 3, ventral margin with five slender setae, posterior margin without setae, posteroventral corner produced in a curved upwards acute process. Urosomite 3 smooth. Uropod 1, peduncle elongated, about three times longer than broad, dorsal margin with three slender setae, dorsoapical corner with two stout setae; both rami subequal in length to peduncle, dorsal margin with four slender setae continuously to apex. Uropod 2, peduncle about twice as long as broad, dorsal margin with five slender setae, dorsoapical corner with one stout seta, ventroapical corner with one slender seta; inner ramus slightly longer than peduncle, apex with one small slender seta, ventral margin with five slender setae continuously to apex; outer ramus, slightly longer than inner ramus, apex with one small slender seta, dorsal margin with seven slender setae continuously to apex, ventral margin with four slender setae continuously to apex. Uropod 3, peduncle short, about 1.2 times longer than broad, dorsoapical corner with six slender setae; inner ramus long, about 5.6 times longer than broad, and about 1.8 times longer than peduncle, bearing a single small setule apically; outer ramus bi-articulated, slightly longer than inner ramus, article 1 about 0.9 times as long as inner ramus, dorsal margin with three slender setae, dorsoapical corner with one long slender seta, ventroapical corner with two slender setae, article 2 about 0.4 times as long as article 1, bearing one apical long slender seta. Telson about as long as broad, deeply cleft, about 85% of its length, apical margin slightly rounded, with two subapical small slender setae, and two dorsolateral setae, one simple and one papose, on each lobe.

Remarks

The new species is easily distinguished from Pseudharpinia dentata by antenna 1, article 1 of peduncle dorsally setulose; antenna 2 article 4, row of facial stout setae ending in a papose stout seta, palp of mandible, ventral margin of article 2 with a mid-length pair of setae, and article 3, with setae only ventrodistally; pereopod 4, coxa with posterior margin rounded and ventral margin with two small anterior plumose setae; pereopod 5, basis more robust than in P. dentata ; pereopod 6, anterior and posterior margins of basis poorly setose and without setae, respectively; pereopod 7, posterior margin of basis without elongated setae between spines; uropod 3, second article of outer ramus 0.4 times the first article length. Pseudharpinia dentata is characterized by antenna 1, article 1 of peduncle without setae dorsally; palp of mandible, ventral margin of article 2 without mid-length setae, and article 3, ventral margin with setae from the medial part to the apex; pereopod 4, coxa with posterior margin subquadrate and ventral margin setose; pereopod 5, basis slender; pereopod 6, anterior and posterior margins of basis densely setose; pereopod 7, posterior margin of basis with elongated setae between spines; and uropod 3, article 2 of outer ramus reduced.

The only species of the genus Pseudharpinia previously recorded from Brazilian waters, P. affinis dentata , among material collected from the south-western Brazilian shelf, off São Paulo State coast, shares with P. dentata almost all the character states listed above, and is also easily separated from P. berardo sp. nov.

Geographic distribution

Known only from the type locality, Campos Basin , off Rio de Janeiro State coast .

Bathymetric range

Collected at 900 m depth.

Figures

Figure 13. Pseudharpinia berardo sp. nov.: female, 5.5 mm, holotype, Campos Basin, 22°35′25″ S, 40°15′31″ W, 900 m depth, 18 May 2003, MNRJ 19201. Scale bars: 1.0 mm for Hb; 0.1 mm for Hd.

Figure 14. Pseudharpinia berardo sp. nov.: female, 5.5 mm, holotype, Campos Basin, 22°35′25″ S, 40°15′31″ W, 900 m depth, 18 May 2003, MNRJ 19201. Scale bars: 0.1 mm.

Figure 15. Pseudharpinia berardo sp. nov.: female, 5.5 mm, holotype, Campos Basin, 22°35′25″ S, 40°15′31″ W, 900 m depth, 18 May 2003, MNRJ 19201. Scale bars: 0.1 mm.

Figure 16. Pseudharpinia berardo sp. nov.: female, 5.5 mm, holotype, Campos Basin, 22°35′25″ S, 40°15′31″ W, 900 m depth, 18 May 2003, MNRJ 19201. Scale bars: 0.1 mm.