Biancolina suassunai, Andrade & Souza-Filho, 2022

Andrade, Renan de Melo & Souza-Filho, Jesser Fidelis, 2022, A new species and record of Biancolina Della Valle, 1893 (Amphipoda, Senticaudata, Ampithoidae) from the Southwestern Atlantic, Papéis Avulsos de Zoologia (Pap. Avulsos Zool., S. Paulo) 62, pp. 1-7 : 2-6

publication ID	https://doi.org/ 10.11606/1807-0205/2022.62.048
publication LSID	lsid:zoobank.org:pub:8F4B446E-0BC2-4026-829F-C12D4B19503A
persistent identifier	https://treatment.plazi.org/id/038087F6-FF9F-4578-FF69-9DB6FC6FF7B6
treatment provided by	Felipe
scientific name	Biancolina suassunai
status	sp. nov.

Treatment

Biancolina suassunai View in CoL sp. nov. ( Figs. 1-5 View Figure 1 View Figure 2 View Figure 3 View Figure 4 View Figure 5 )

Type material: Holotype, male, 2.1 mm, 16 July 2018, Praia do Paraíso, Suape Bay , Pernambuco state (08°21′23.178″S, 34°57′06.386″W), between 0.5 and 1.0 m depth, MOUFPE 19604 View Materials . GoogleMaps

Paratypes: 1 female (dissected and drawn), same from holotype, MOUFPE 19605. 1 male, same from holotype, MOUFPE 19606. 1 female, same from holotype, MOUFPE 19607. 23 female and 2 males, same from holotype, MOUFPE 19608. MOUFPE 20014, 8 unsexed, 15 10 unsexed, 30 June 2019, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20025. 5 unsexed, 30 June 2019, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20026. 11 unsexed, 30 August 2019, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20027. 71 unsexed, 30 August 2019, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20028. 29 unsexed, 30 August 2019, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20029. 7 unsexed, 30 August 2019, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20030. 1 unsexed, 11 January 2020, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20031. 6 unsexed, 11 January 2020, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20032. 12 unsexed, 11 January 2020, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20033. 5 unsexed, 11 January 2020, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20034. 1 unsexed, 10 February 2020, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20035. 1 unsexed, 10 February 2020, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20036. 3 unsexed, 10 February 2020, Praia do Paraíso,Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20037. 2 unsexed, 10 February 2020, Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W), MOUFPE 20038.

Type locality: Praia do Paraíso, Suape Bay, Pernambuco state (08°21′23.178″S, 34°57′06.386″W).

Etymology: The epithet is in honor of the famous writer Ariano Vilar Suassuna for his efforts towards promoting and strengthening cultural awareness of the northeast Brazilian region. Also, the first author (RMA) was born on the same date as Ariano Suassuna (June 16 th).

Diagnosis: Antenna 2 article 4 longer than article 5 (1.4 ×). Left and right mandible with lacinia mobilis. Maxilla 2 outer lobe with rounded apex. Maxilliped inner plate with two apical plumose setae. Gnathopod 1 and 2 propodus with palm transverse. Coxae 5 and 6 anterolobate. Uropod 1 peduncle 1.25 × longer than outer ramus. Uropod 2 outer ramus 2.4 × longer than inner ramus. Telson distally notched.

Description: Based on holotype (male, 2.1 mm).

Head: Head longer than deep; inferior margin produced. Antenna 1 longer than antenna 2 (more than 2 ×); peduncular article 1 shorter than article 2; article 2 longer than article 3; article 3 subequal to article 1; primary flagellum with 10 articles; accessory flagellum absent. Antenna 2 slender, similar to antenna 1; peduncle articles 3 to 5 not densely setose on ventral margin; peduncle article 4 subequal in length to article 5; flagellum subequal to peduncular article 5, flagellum 3 articles. Upper lip directed forwards, at around 45 degrees, lateral margins without midlateral notches. Mandible molar absent, accessory setal row with 3 robust setae; palp absent. Lower lip outer plates entire, lateral lobe distinctly longer than medial lobe, without an apical nipple; mandibular lobe with straight margins, round- ed apically. Maxilla 1 inner plate with 1 slender setae; palp absent. Maxilla 2 inner plate narrower than outer plate; inner plate without oblique setal row. Maxilliped outer plate without a row of robust setae along medial margin.

Pereon: Gnathopod 1 not sexually dimorphic, subequal in size to gnathopod 2, without long, dense, plumose setae on margins; coxa 1 subequal to coxa 2; broader than deep; anteroventral corner not produced, anterior margin convex, anteroventral corner rounded, with one seta; basis longer than coxa, posterior margin with long, slender setae, anterodistal lobe absent; ischium anterior margin with small lobe; merus anterodistal lobe round- ed, posterodistal corner rounded; carpus about 1.5 × as long as broad, subequal in length to merus, shorter than propodus (0.6 ×); carpus subtriangular, lobe absent, anterior margin with slender setae, posterior margin convex; propodus narrow, length 2.5 × width, propodus subrectangular; palm transverse or nearly so, straight, palm defining corner, subquadrate,without robust setae defining palm; dactylus overreaching palm, inner margin with a spine. Gnathopod 2 not sexually dimorphic, with long, simple setae on margins, coxa without long, plumose setal fringe on ventral margin, without any setae or with a simple seta on anteroventral corner, basis longer than coxa, basis with long, slender setae, basis anterodistal lobe vestigial or absent; ischium anterior margin without lobe; merus margin without lobe; carpus shorter than propodus, (0.6 × length), subtriangular, anterior margin with a single robust seta; propodus narrow, greater than 1.5 × as long as broad, (2.5 × width), subrectangular, not produced into an anterodistally setose lobe; palm transverse or nearly so, palm entire and slightly convex, without proximal or midmedial tooth, defining corner subquadrate, lacking robust setae; dactylus overreaching palm, tapering evenly, apically acute, dactylus without unguis, inner margin with a spine. Pereopod 3 basis expanded; merus distally expanded; carpus about 1.5 × as long as broad. Pereopod 4 basis similar to pereopod 3. Pereopods 5-7 strongly prehensile. Pereopod 5 coxa anterolobate (lobe long and rounded distally); merus subrectangular; distal articles slender; propodus slightly expanded distally, 2 distal striated robust setae, defining robust setae simple; dactylus slightly curved. Pereopod 6 basis posterior margin rounded, without marginal robust setae, with medial slender setae; merus subrectangular; distal articles slender; propodus slightly expanded distally; with 1 proximal robust setae; 2 distal striated robust setae; dactylus slightly curved. Pereopod 7 similar to pereopod 6; basis without marginal robust setae, without medial slender setae; distal articles slender; with 1 proximal robust seta; with 1-2 striated robust setae.

Pleon: Epimeron 3 posteroventral corner broadly rounded. Uropod 1 sexually dimorphic; short, reaching end of uropod 2 peduncle; peduncle 0.7 × longer than wide; peduncle without robust setae, peduncle without slender setal fringe; peduncle outer margin with 3 very long simple setae; peduncle distal margin with 4 slender setae; distoventral spur vestigial or absent; inner ramus shorter than outer ramus, robust setae absent, slender setae present; outer ramus broad with fluted like water spout, connected with ductular structure originated from inside of ⅓ of the distal part; outer ramus broad, length about 2-4 × as long as broad, marginal without robust setae, slender setae present. Uropod 2 not sexually dimorphic; peduncle 2 × longer than wide; peduncle without distolateral projection, peduncle robust setae absent, slender setae fringe absent; rami subequal in length; inner ramus marginal robust setae absent, slender setae present (3 long setae); outer ramus marginal robust setae absent, slender setae present. Uropod 3 peduncle longer than broad, 1.4 × width, 0.7 × outer rami length, without marginal robust setae, outer margin with 3 slender setae, without distal slender setae; outer ramus subequal in length to inner ramus, with 2 small, straight or weakly curved distal robust setae, without patch of small lateral denticles; inner ramus with 1 distal robust setae and 1 distal slen- der setae, lacking lateral robust setae. Telson suboval, apically rounded; notched; without apical cusps, with dorsal slender setae (1 pair), without lateral plumose setae; denticles absent.

Female (dimorphic characters only)

Head eyes about50%smaller than the male. Antenna1 reaching posterior margin of pereonite 2; peduncular article 1 about 0.5 × article 2; article 2 about 1.5 × article 3; article 3 subequal to article 1; primary flagellum 7 articles. Uropod1 peduncle 1.5 × longer than wide; peduncle outer margin with 6+ very long simple or plumose setae; outer ramus shortened; inner ramus 1.4 × longer than outer ramus; with 2 apical slender setae; outer ramus not fluted like; outer ramus slender, length about 5-6 × as long as broad, slender setae present (1 apical). Uropod 2 sexually dimorphic; peduncle inflated, 3.3 × longer than wide; peduncle with 6+ very long plumose setae; outer ramus shortened; inner ramus longer than outer ramus (1.5 ×); 1 apical slender setae present.

Habitat: Living in association with Sargassum spp. between 0.5 and 1.0 m depth.

Distribution: Known only from type locality.

Remarks: Biancolina suassunai sp. nov. closely resembles B. japonica Ishimaru, 1996 , known from Japan Sea and Australia ( Ishimaru, 1996; Hughes & Poore, 2016), form sharing the following states of characters: (a) antenna 1 at least 2 × longer than antenna 2, (b) lacinia mobilis present in both mandibles, (c) article 4 of the maxilliped bulbose; (d) coxae 5 and 6 with anteroventral lobe well developed, (e) outer ramus of the uropods half length of inner ramus, and (f) telson with only a distal notch. However, both species can differ by the following combination of characters (characters of the B. japonica in parenthesis): coxa 6 with anteroventral lobe as well developed as posteroventral lobe (vs. anteroventral lobe more developed than posteroventral lobe), peduncle of uropod 1 weakly setose (vs. strongly setose), palm of pereopods 5-7 lacking robust seta (vs. with robust seta).