Metharpinia hirsuta Souza-Filho & Andrade, 2025

(SOSA), Senckenberg Ocean Species Alliance, Andrade, Luiz F., Boyko, Christopher B., Brandt, Angelika, Buge, Barbara, Dávila Jiménez, Yasmín, Henseler, Mats, Hernández Alcántara, Pablo, Jóźwiak, Piotr, Knauber, Henry, Marcondes Machado, Fabrizio, Martínez-Muñoz, Carlos A., Momtazi, Farzaneh, Nakadera, Yumi, Qiu, Jian-Wen, Riehl, Torben, Rouse, Greg W., Sigwart, Julia D., Sirenko, Boris, Souza-Filho, Jesser F., Steger, Jan, Stępień, Anna, Tilic, Ekin, Trautwein, Bianca, Vončina, Katarzyna, Williams, Jason D. & Zhang, Junlong, 2025, Ocean Species Discoveries 13 – 27 — Taxonomic contributions to the diversity of Polychaeta, Mollusca and Crustacea, Biodiversity Data Journal 13, pp. e 160349-e 160349 : e160349-

Metharpinia hirsuta Souza-Filho & Andrade sp. nov.

Materials

Type status: Holotype. Occurrence: catalogNumber: MOUFPE 22050 ; recordedBy: Jesser F. Souza-Filho | Luiz F. Andrade; individualCount: 1; sex: female; lifeStage: adult; preparations: whole animal (ETOH); previousIdentifications: Metharpinia sp. ; occurrenceID: 13EB2920-2820-528E-A68C-CB624E72E4AF; Taxon: scientificName: Metharpinia hirsuta Souza-Filho & Andrade ; kingdom: Animalia; phylum: Arthropoda; class: Malacostraca; order: Amphipoda ; family: Phoxocephalidae ; genus: Metharpinia ; specificEpithet: hirsuta ; taxonRank: species; scientificNameAuthorship: Souza-Filho & Andrade; nomenclaturalCode: ICZN; Location: locationID: http://marineregions.org/mrgid/32405; higherGeography: Atlantic Ocean; waterBody: Potiguar Basin; country: Brazil; countryCode: BR; stateProvince: Ceará; locality: Potiguar Basin, station 075 - CES 23 ; verbatimDepth: 34.4 m; verbatimLatitude: 3°08.6399'S; verbatimLongitude: 38°51.9827'W; verbatimCoordinateSystem: degrees decimal minutes; decimalLatitude: - 3.144; decimalLongitude: - 38.8664; Identification: identifiedBy: Jesser F. Souza-Filho, Luiz F. Andrade; Event: samplingProtocol: van Veen grabber; eventDate: 09-07 - 2009; year: 2009; month: 7; day: 9; habitat: fine sand sediment; fieldNumber: 075 - CES 23; Record Level: institutionCode: MOUFPE; basisOfRecord: PreservedSpecimen

Type status: Paratype. Occurrence: catalogNumber: MOUFPE 22051 ; recordedBy: Jesser F. Souza-Filho | Luiz F. Andrade; individualCount: 1; sex: female; lifeStage: adult; preparations: whole animal (ETOH); previousIdentifications: Metharpinia sp. ; occurrenceID: 6B9A18A2-26CF-5EA9-AF2A-7B73BFDCF402; Taxon: scientificName: Metharpinia hirsuta Souza-Filho & Andrade ; kingdom: Animalia; phylum: Arthropoda; class: Malacostraca; order: Amphipoda ; family: Phoxocephalidae ; genus: Metharpinia ; specificEpithet: hirsuta ; taxonRank: species; scientificNameAuthorship: Souza-Filho & Andrade; nomenclaturalCode: ICZN; Location: locationID: http://marineregions.org/mrgid/32405; higherGeography: Atlantic Ocean; waterBody: Potiguar Basin; country: Brazil; countryCode: BR; stateProvince: Ceará; locality: Potiguar Basin, station 075 - CES 12 ; verbatimDepth: 35.5 m; verbatimLatitude: 3°08.5838'S; verbatimLongitude: 38°52.0264'W; verbatimCoordinateSystem: degrees decimal minutes; decimalLatitude: - 3.1431; decimalLongitude: - 38.8671; Identification: identifiedBy: Jesser F. Souza-Filho, Luiz F. Andrade; Event: samplingProtocol: van Veen grabber; eventDate: 08-07 - 2009; year: 2009; month: 7; day: 8; habitat: fine sand sediment; fieldNumber: 075 - CES 12; Record Level: institutionCode: MOUFPE; basisOfRecord: PreservedSpecimen

Description

Holotype, MOUFPE 22050, adult female, 7.1 mm. Figs 24 , 25 , 26 , 27 .

Body as in Fig. 24 . Head (Fig. 25 A and B) rostrum constricted, elongate and spatulate, reaching the proximal part of A 1 art 2; eyes rounded. A 1 (Fig. 25 C) weakly setose, art 1 with few pappose brush setae, art 2 elongate, posterior margin with a medial group of setae, art 3 short; flagellum 9 - articulate; acc flag 8 - articulate. A 2 (Fig. 25 D) art 4 facial stout setae formula 4-4 - 2 - 4, ventral margin strongly setose with long setae, dorsal margin with two stout setae, art 5 with three facial stout setae; flagellum 11 - articulate. Md (Fig. 25 E and F) incisor with three (left) and two (right) cusps, lacinia mobilis multicuspidate (left) and absent (right), molar as a hump with robust setae; palp 3 - articulate, art 3 long, 1.7 x longer than art 2, apex oblique and setose. Mx 1 (Fig. 25 G) inner plate with three apical plumose setae; outer plate with 11 robust setae; palp 2 - articulate, art 2 apex with four robust and few simple setae. Mx 2 (Fig. 25 H) inner and outer plates subequal, apically setose. Mxp (Fig. 25 I) inner plate with plumose setae and two apical robust setae; outer plate with robust papposerrate setae distally increasing in length; palp art 2 and art 3 moderately setose, art 4 bearing an apical nail.

C 1 – 4 (Fig. 26 A, B, C and D) short, ventrally setose, with one long pappose setae (except C 4 that has seven). P 1 (Fig. 26 A) basis broadening distally; carpus posterior margin moderately setose; propodus weakly setose, with one stout seta defining palm; palm acute, palmar hump medium and pointed; dactylus reaching the palm length. P 2 (Fig. 26 B) slightly more robust than P 1; basis elongate; carpus posterior margin moderately setose; propodus weakly setose, with one stout seta defining palm; palm acute, palmar hump medium and pointed; dactylus reaching the palm length. P 3 (Fig. 26 C) basis broad, merus and carpus posterior margin moderately setose, carpus distal long robust seta extending about 80 % of propodus; propodus with 11 stout setae; dactylus short. P 4 (Fig. 26 D) very similar to P 3, but more setose in the posterior margin of merus and carpus. P 5 (Fig. 26 E) coxa posteroventral margin with six pappose setae; basis broad, with an anterodistal facial row with nine setae; ischium short and subrectangular; merus margins setose, with simple, plumose and pappose setae, with facial groups of stout setae; carpus and propodus margins setose, but only posterior margin with plumose setae, with facial and lateral groups of stout setae; dactylus short. P 6 (Fig. 26 F) stout; coxa posteroventral margin with four pappose setae; basis 1.4 x longer than wide, anterior margin with setae; merus and carpus broad, posterior margins with plumose setae, with facial and lateral groups of stout setae; propodus short, with groups of stout setae; dactylus short. P 7 (Fig. 26 G) coxa posteroventral margin with two pappose setae; basis 1.4 x longer than wide, expanded posteroventrally, reaching the apex of merus, posterior margin serrate; merus, carpus and propodus moderately setose; dactylus long.

Ep 1 (Fig. 27 A) with four plumose setae, posteriorly rounded. Ep 2 (Fig. 27 B) ventral margin with a row of plumose setae, posterior margin with 11 pectinate setae. Ep 3 (Fig. 27 C) with an oblique facial row of seven stout setae, posteroventral corner produced as a spine, posterior margin with 10 pectinate setae. Urosomite 3 (Fig. 27 D) dorsally produced as a blunt hump. U 1 (Fig. 27 E) peduncle longer than rami, dorsal margin with seven robust and three simple setae; outer ramus with four dorsal stout setae proximally; inner ramus with one medial dorsal stout seta and one subapical stout seta. U 2 (Fig. 27 F) peduncle subequal in length to rami, dorsal margin with seven stout setae; rami short; outer ramus with four dorsal stout setae; inner ramus with one medial dorsal stout seta and one subapical stout seta. U 3 (Fig. 27 G) peduncle with six robust setae; outer ramus art 1 as long as inner ramus, with four robust setae, art 2 with two apical plumose setae; inner ramus with three subapical and two apical setae. T (Fig. 27 H) about 85 % cleft, each side with one dorsal short brush setae and a group of six long setae, apical margin with one stout and one brush seta.

Type material

Holotype ( MOUFPE 22050) and one paratype.

Material examined

Only known from the type material.

Type locality

Potiguar Basin, Ceará State, Brazil.

Diagnosis

Head rostrum reaching the proximal part of A 1 art 2. A 2 art 4 posterior margin strongly setose with long setae. Md molar as a hump with stout setae, palp art 3 longer than art 1 and art 2 combined. C 1–3 short, ventrally setose, with one long pappose seta. P 1–2 palmar hump medium and pointed. Ep 3 posteroventral corner produced as a spine. Urosomite 3 dorsally produced as a blunt hump. U 2 peduncle subequal in length to rami, rami short.

Etymology

The specific epithet hirsuta is derived from the Latin word hirsutus, meaning "hairy" or "bristly", in reference to the setose appendages of this species.

Distribution

Only known from Potiguar Basin, Ceará State, Brazil; specimens were found in fine sand sediments between 34.4 m and 35.5 m depth.

Taxon discussion

Metharpinia hirsuta Souza-Filho & Andrade , sp. nov. is most morphologically similar to Metharpinia grandirama Alonso de Pina, 2003 ( Alonso de Pina 2003) mainly due to the following characters: A 1 art 2 elongate; U 1 and U 2 peduncle with a distal large robust seta, rami short and robust, with few dorsal stout setae. However, the new species can be mainly distinguished from Metharpinia grandirama by the following characters (characters of Metharpinia grandirama in parentheses): A 2 art 4 posterior margin strongly setose (weakly); C 1–3 short, ventral margin strongly setose (long and moderately setose); P 1 and P 2 palmar hump medium and pointed (blunt); Ep 3 posteroventral corner produced as a spine (rounded, without a spine). Urosomite 3 dorsally produced as a blunt hump (produced as a larger acute spine).

The new species can also be distinguished from its congeners by presenting a very setose art 4 of A 2 and C 1–4 ventral margins, broadened and shortened propodus of P 6 and rami of U 1 and U 2.

Methods

The preserved specimens analysed here were collected in the Potiguar Basin, north-eastern Brazil, during the project " Avaliação de Impactos Ambientais da Atividade de Perfuração nas Bacias Potiguar e Ceará (PAI UN-RNCE) ". The project was developed by the Brazilian Oil Company " Petróleo Brasileiro S / A (PETROBRAS) " and carried out onboard the R / V LUKE THOMAS, using a van Veen grabber. During the campaign, sediment samples were collected for the physical-chemical and biological characterisation of the sediment around four offshore drilling wells and their respective reference areas.

Specimens were fixed and preserved in 75 % ethanol. For the taxonomic study, all appendages of the holotype were dissected and mounted in glycerine gelatin slides. Appendage photographs were taken using a NIKON Eclipse Ci-L, equipped with a Delta Optical DLT-Cam PRO 5 MP and subsequently used as the basis for line drawings, which were inked with CorelDRAW 2018.

Repository: Specimens are held in the crustacean collection of Museu de Oceanografia Petrônio Alves Coelho, Universidade Federal de Pernambuco, City of Recife, Brazil ( MOUFPE).

Figures

Figure 24. Metharpinia hirsuta Souza-Filho & Andrade, sp. nov., female holotype (MOUFPE 22050). Habitus photograph. Scale bar: 1 mm.

Figure 25. Metharpinia hirsuta Souza-Filho & Andrade, sp. nov., female holotype (MOUFPE 22050). A Head lateral view; B Head dorsal view; C Antenna 1; D Antenna 2; E Left mandible; F Right mandible incisor; G Maxilla 1; H Maxilla 2; I Maxilliped. Scale bars: 0.3 mm (A – D), 0.1 mm (E – I).

Figure 26. Metharpinia hirsuta Souza-Filho & Andrade, sp. nov., female holotype (MOUFPE 22050). A Pereopod 1 (gnathopod 1); B Pereopod 2 (gnathopod 2); C Pereopod 3; D Pereopod 4; E Pereopod 5; F Pereopod 6; G Pereopod 7. Scale bars: 0.3 mm.

Figure 27. Metharpinia hirsuta Souza-Filho & Andrade, sp. nov., female holotype (MOUFPE 22050). A Epimeral plate 1; B Epimeral plate 2; C Epimeral plate 3; D Urosomite 3; E Uropod 1; F Uropod 2; G Uropod 3; H Telson. Scale bars: 0.3 mm (A – G), 0.1 mm (H).