Princaxelia kahat Duffy & Wainwright 2026, sp. nov.

Le résumé fourni par la source

Princaxelia kahat Duffy & Wainwright sp. nov. Figs 9, 10, 11, 12, 13, 14, 15 Princaxelia magna: Jamieson and Weston 2023: table 2. Material examined. Holotype. • Mature ♂, body length 59.3 mm; Mariana Trench (12°17.316'N, 144°40.112'E); 8,143 m; 5 Dec. 2014; Baited lander. USNM accession number USNM 1775248. GenBank ® accession number: 16 S: PZ 611773; 28 S: PZ 611782. Other material. • 4 ♂, 2 ♀; Mariana Trench (11°10.002'N, 142°30.972'E); 8,000 m; 26 Jan. 2017; Baited lander. GenBank ® accession numbers: 16 S: PZ 611770 – PZ 611772; 28 S: PZ 611778 – PZ 611781. Diagnosis. Primary flagellum article 1 of male antennae 1 elongate and longer than half the body. Accessory flagellum of male antennae 1 article 1 enlarged and flattened, with three small articles at distal end. Upper lip slightly asymmetrical. Maxilla 1 inner plate with six plumose setae; palp article 2 expanded with 16 apical robust setae. Maxilla 2 outer plate with three plumose setae. Maxilliped inner plate with one apical plumose seta. Dactylus of gnathopods 1 with three and gnathopod 2 with five strong projections on the posterior margin near the base. Dorsal margin of coxa 5 slightly lower on distal end. Ventral margin of coxa 7 shallowly concave. Telson lobes broad and tapering distally at last 1 / 3. Description primarily based on holotype, male. Head. (Figs 9, 10) Slightly shorter than length of pereonites 1 and 2 combined; rostrum very short, slightly pointed; lateral cephalic lobe prominent; corner rounded; eyes absent. Antennae. (Fig. 11) Extremely elongate, over 70 percent body length. Peduncle articles 1–3 with length ratio 1.0: 0.5: 0.2; peduncular article one broadened, with several clusters of setae arranged in rows on ventral margin, some weakly plumose, sparse setae on dorsal margin; posterior of peduncular article 2 with short setae clusters. Primary flagellum article one thin and elongate with length 7 × width, dorsal submargin with dense clusters of thin sensory setae (aesthetascs), forming a callynophore. Primary flagella with 108 articles. Accessory flagellum 4 - articulate; article 1 elongate and scale-like with setae on posterodorsal margin; articles 2–4 tapered and setose. Antennae 2 dorsal margin of peduncular article 1 and ventral margin of article 2 with short setae clusters; peduncular article 3 elongate with sparse small setae. Article 4 damaged and flagella lost in collection. Mouthparts. (Fig. 12) Upper lip medial face asetose, with asymmetrical ventral margin. Mandible lacinia mobilis present on left and right side, highly asymmetric, left lacinia mobilis broad and multi-dentate, 22 robust setae on setal row. Right lacinia mobilis thin with broad projection at proximal end; 21 robust setae on setal row. Mandible incisors with strong posterodistal projection, slightly asymmetric; molar absent. Mandible palp 3 - articulate, article 1 asetose, short; article 2 arched medially with 28 setae on medial margin; article 3 with many setae arranged in rows. Lower lip with distinct outer lobes present; mandibular process absent or severely reduced. Maxilla 1 inner plate small with six apical plumose setae; outer plate arched medially with 14 robust apical setae with one large claw-like projection at the distal end. Maxilla 1 palp 2 - articulate; article 1 subrectangular, setae on posterior; article 2 expanded distally with 16 apical and nine marginal robust setae, apical submargin with setae. Maxilla 2 inner plate with 16 plumose setae along apical to medial margin, outer plate thin with three plumose setae along the apical margin. Maxilliped with inner and outer plates and palp; inner plate small and subtriangular with one apical plumose setae, one additional robust setae on the ventral margin; outer plate rounded, reaching base of palp article 2, with robust setae along medial to apical margin. Maxilliped palp long, 4 - articulate; article 1 short, lateral margin with sparse short setae, medial margin with dense setae; article 2 longest article, similar pattern of setae as article 1; article 3 long, slightly shorter than article 2 with similar setae pattern; article 4 slender with strong claw-like projections on medial margin, tapered distally. Body. Pereon with subrectangular pereonites, dorsal and ventral margin smooth; pleon with dorsal surface smooth; coxal gills present on gnathopod 2, pereopods 3–6; gills 2–4 elongate, gills 5 and 6 short and ovular; dorsal margins of urosomites 1 and 2 with single thorn-like projection each, pointed upward in urosomite 1, tapered distally in urosomite 2, urosomite 3 dorsal margin smooth. Gnathopods. (Fig. 13 A – F) Gnathopod 1 coxa subrectangular and slightly bilobate, ventral margin straight; basis slightly arched distally, with sparse setae, length 1.78 × width; ischium small and subquadrate, single clump of setae near base of merus on posterior margin; merus broad, concave along proximal margin, ventral margin with evenly separated clumps of setae; carpus broad and rounded, length 2.3 × width, dorsal margin smooth with short sparse setae, lateral face asetose, posterior ventral submargin and medial face with dense clumps of setae; propodus narrower than carpus, posterior margin with dense setae, with one robust seta at ventral posterodistal corner; dactylus thin, ventral margin with setae, posterior margin with three strong projection near base. Gnathopod 2 coxa subrectangular and slightly bilobate; basis straight and elongate, length 1.7 × width, setae on posterior margin; ischium similar to gnathopod 1; merus more elongate than gnathopod 1 with numerous dense setae clumps on ventral submargin; carpus deep, subrectangular, length 2.3 × width, dorsal margin smooth with sparse setae, lateral face asetose, ventral submargin and medial face densely setose; propodus with numerous, broadly plumose setae, otherwise similar to gnathopod 1; dactylus with majority of posterior margin asetose with five strong projections near base. Pereopods. (Figs 13 G – J, 14) Pereopod 3 coxa ovular, slightly bilobate along dorsal margin, ventral submargin rounded with sparse setae; basis elongate, anterior and posterior margin setose, large clump of setae on posterodistal angle; ischium anterior margin concave, dense clump of setae on posterodistal margin; merus, carpus, propodus, and dactylus length ratio 1.00: 0.91: 0.37: 0.37; merus elongate, distal margin tapered, dorsal and ventral margins straight, posterior margin setose; carpus elongate, rounded; dorsal margin asetose, posterior margin with dense setae. Propodus elongate, thin, anterior margin asetose, posterior margin with short setae; dactylus slender with single robust seta near distal end. Pereopod 4 similar to pereopod 3. Pereopod 5 coxa subrectangular, tapered near proximal end, dorsal margin slightly convex, ventral margin straight, sparsely setose, length 2.4 × width; basis broad and rectangular, length 3.4 × width, posterior margin with many thin setae, anterior margin sparsely setose, posterodistal corner rounded; merus thin, anterior and posterior margin setose; medial face setose; carpus slightly shorter than merus, with similar setae arrangement. Pereopod 6 coxa subrectangular, slightly tapered at distal end, ventral margin slightly concave, distal end sparsely setose; entire pereopod long and slender; basis broad, length 2.3 × width, posterodistal corner rounded. Pereopod 7 coxa slender and slightly tapered at distal end, ventral margin slightly concave, posterodistal margin with sparse setae, medial margin with large penile papillae faced medially. Pleon and urosome. (Fig. 15) Epimeron setose on ventral submargin; epimeral plate 1 ventral margin curved with strong groove above the ventral margin, posterodistal corner pointed; epimeral plate 2 subrectangular, with strong groove above the ventral margin, posterodistal corner rounded; epimeral plate 3 subrectangular, posterodistal corner quadrate. Pleopods 1–3 with paired coupling setae (retinacula) on medial distal margin o

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