Abyssorchomene patriciae Hendrycks & Broyer 2022, sp. nov.

Abyssorchomene patriciae sp. nov. urn:lsid:zoobank.org:act: 267EAAEE-5F5C-4DAA-93F9-014B36F6B0AB Figs 10–17 non Abyssorchomene abyssorum – Thurston 1990: 262–263, 269 (= A. patriciae in part; part = A. cf. patriciae; T. Horton, pers. com.). —? Jones et al. 1998: 1124–1125. — Gutteridge 2012: 5, 22, 24 (= A. patriciae; T. Horton, pers. com.). — Corrigan et al. 2013: 156, 158–161 (= A. cf. patriciae). — Duffy et al. 2013: 360–368 (= A. patriciae; T. Horton, pers. com.). — Horton et al. 2013: 352, 354–358 (= A. patriciae; T. Horton, pers. com.). — Priede et al. 2013: 8 (= A. cf. patriciae). — Horton et al. 2020: 6–7, 11 (= A. patriciae; T. Horton, pers. com.). Diagnosis Pereonites 1–7 and pleonites 1–2 with a slight but distinct dorsoposterior hump on each segment. Lateral cephalic lobe broadly rounded, dorsal and ventral margins slightly dissimilar in shape, dorsal margin strongly convex, ventral margin nearly straight with a very slight concavity. Antennae 1–2 of male with calceoli, female without. Epistome level with and scarcely differentiated from upper lip. Maxilla 1 palp distal end weakly convex and with conical apical spines contiguous. Maxilliped inner plate, distal margin shallowly but distinctly concave, with a very weak mediodistal extension; outer plate inner margin very weakly scalloped. Coxa 1 distinctly widened, distal width 1.3× proximal width or greater. Gnathopod 2 propodus of female broadened, subovate, length 1.7× width (different in form to narrow male propodus), dactylus large, inserted at the top of distal margin and occupying most of the length (~ 85%) of the distal margin, forming a distinct, small gap on the palm. Coxa 5 posteroventral lobe narrowly rounded, posterior margin with distinct straight section. Pereopod 7 basis, posteroventral corner shallowly and weakly beveled. Uropod 1 peduncle relatively short, length less than 1.5 × length of outer ramus. Uropod 3 inner ramus extends to ~ 63% of article 2 of uropod 3 outer ramus. Telson cleft ~ 52% of length. Etymology The species name is dedicated to Patricia De Broyer, the daughter of the co-author. Material examined Holotype NORTHEAST ATLANTIC • ♀ (mature, 10.5 mm, figured, appendages on 3 slides); Porcupine Abyssal Plain; RRS James Cook (2011), station JC 062-063; 49°05.3′ N, 16°40.0′ W; depth 4848 m; gear, baited traps, A-trap B2; 8 Aug. 2011; NHM UK 2022.6 (see Horton et al. 2020). Allotype NORTHEAST ATLANTIC • 1 ♂ (7.5 mm, figured, appendages on 3 slides); same collection data as for holotype; NHM UK 2022.7. Paratypes NORTHEAST ATLANTIC • 3 ♀♀ (7.0– 10.8 mm), 2 ♂♂ (5.5–7.0 mm); same collection data as for holotype; NHM UK 2022.8 • 3 ♀♀, 2 ♂♂; same collection data as for holotype; CMNC 2022-0002 • 3 ♀♀, 3 ♂♂; same collection data as for holotype; RBINS INV. 138.487. Additional material NORTHEAST ATLANTIC • 10 specs (♀♀ & ♂♂); same collection data as for holotype; NHM UK 2022.9 • 20 specs (♀♀ & ♂♂); same collection data as for holotype; CMNC 2022-0003 • 20 specs (♀♀ & ♂♂); same collection data as for holotype; RBINS INV. 138.488. NORTHWEST ATLANTIC • 2 ♀♀ (7.5–8.5 mm); Mid-Atlantic Ridge area, north of Charlie-Gibbs Fracture Zone; RRS James Cook (2009), station JC 037-060; 53°58.46′ N, 36°06.12′ W; depth 2340 m; gear baited traps; 27–30 Aug. 2009; CMNC 2022-0004 • 3 ♀♀; same collection data as for preceding; RBINS INV. 138.489. Description Holotype Mature female, 10.5 mm, NHM UK 2022.6. PEREONITES 1–7 AND PLEONITES 1–2 (Figs 10–11). With a slight but distinct dorsoposterior hump on each segment (note: Fig. 10 is of male, but female is similar). PLEONITE 3 (Fig. 11). With a rounded, posterodorsal elevation slightly overhanging urosomite 1. COXAE 1–2 (Fig. 10). Slightly shorter than corresponding pereonites (in lateral view) (note: Fig. 10 is of male, but female is similar). COXAE 3–4 (Fig. 10). Slightly longer (~1.2×) than corresponding pereonites (note: Fig. 10 is of male, but female coxae are slightly deeper). EPIMERON 3 (Fig. 11). Subquadrate, with posterodistal angle very slightly obtuse, posterior margin weakly but regularly convex, ventral margin convex. UROSOMITE 1 (Fig. 11). With a deep, narrow dorsal concavity in front of the strongly projecting, slightly unequally rounded, dorsal boss, slightly overhanging urosomite 2. HEAD (Fig. 11). Slightly longer (1.13×) than pereonite 1. LATERAL CEPHALIC LOBE (Fig. 11). Broadly rounded, dorsal and ventral margin not similar in shape, dorsal margin strongly convex, ventral margin nearly straight with a slight concavity. EYE (Fig. 11). Non ommatidial, formed of pigment granules; long, narrow, L-shaped, extending parallel to the front head margin, length about 63% of the head height (note: eye shape and size are best observed with fresh specimens, as over time in preservation the labile components of the eye pigments can be lost, causing the eyes to become extremely difficult to ascertain- see eye of freshly collected male, Fig. 10). ANTENNA 1 (Fig. 11). Peduncular article 1 dilated (length 1.3× width), without small dorsal keel projecting distally over article 2; flagellum broken after the sixth article (likely with 9–10 articles counted from 6 other females), length 1.5 × peduncle, first article of flagellum callynophorate, densely furnished medially with double row of aesthetascs; accessory flagellum 5-articulate, first article slightly broader and longer than remaining articles combined, calceoli absent. ANTENNA 2. Slightly longer (less than 1.3×) than antenna 1; geniculate between peduncular articles 3–4, peduncular articles 4–5 lined with anteromedial brush setae; flagellum 12-articulate, calceoli absent. EPISTOME (Fig. 11). Level with and scarcely differentiated from upper lip, forming long anterior cephalic ridge, weakly concave. UPPER LIP (Fig. 12). Not protruding, with an asymmetrical midventral, angular projection. MANDIBLE (Fig. 12). Incisor strongly convex and widened; left lacinia mobilis curved, with 2 strong apical teeth, right lacking; accessory spine row with 3 strong spines, interspersed with fine setae; molar forming a narrow crest, somewhat falciform, acutely produced on proximal end, setose with mixed ornamentation, distal half or third setiferous, proximal half or two-thirds forming a reduced, ridged triturative surface, hairy process attached proximal to molar; palp attached proximal to molar, article 2 1.65 × length of article 3, with 17 A2 setae, article 3 falciform, 0.61× length of article 2, with 1 A3-seta, 20 D3-pectinate setae and 3 E3-setae. LOWER LIP. Outer lobes broad with inner margins strongly setose, distal inner margins excavated; without inner lobes, mandibular lobes narrow, rounded. MAXILLA 1 (Fig. 12). Inner plate with small, distal subtriangular projection surpassing the basal insertion of the 2 subapical plumose setae; outer plate with 11 elongated spine-teeth in 7/4 crown arrangement; palp article 2 strongly widened at distal two-thirds, with 10 (left side) or 9 (right side) contiguous conical apical spines, and one apical strong seta on outer corner. MAXILLA 2 (Fig. 13). Outer and inner plates tapering distally, both with strong rows of pectinate medial marginal spines and setae; inner plate much shorter and distinctly narrower than outer plate, with marginal setae on the distal third of the inner margin, distal end of inner plate not reaching the proximal end of setal row of outer plate. MAXILLIPED (Fig. 13). Inner plate subrectangular, extending slightly past the distal end of the inner margin of palp article 1 and reaching about 0.34 × length of outer plate, distal margin shallowly but distinctly concave, with very weak mediodistal extension, not surpassing the level of the weak outer extension, with 3 strongly embedded nodular spines, the two mediodistal marginal nodular spines situated close to each other, the third one located in about the middle of the plate, medial margin strongly setose; outer plate elongated, subovate, length 1.83× width, reaching the distal end of palp article 2, with two dissimilar apical spines and numerous (12) embedded, medial nodular spines, medial margin very slightly scalloped; palp strongly setose medially, article 4 well developed, about 0.56 × length of article 3, inner margin with 2–3 distal setae. GNATHOPOD 1 (Fig. 14). Coxa distinctly widened, distal width 1.3× proximal width and about 76% of length, anterior margin concave, anterodorsal corner rounded, posterior margin nearly straight, distal margin strongly convex in anterior half, weakly convex in posterior half, posteroventral corner not narrowly rounded; basis stout, width about one third of the length and similar to propod width, anterior margin with very short setae; ischium subequal to merus, both with posterior margins setose; carpus short, about half the length of the propodus, with produced narrow posterodistal lobe, not guarding the hind margin of propodus; propodus subchelate, subrectangular, slightly narrowing distally, with anterior margin regularly convex, posterior margin slightly concave, with a distinct inflexion at distal two-thirds, palm transverse, microcrenulate, palmar corner with 2 blunt protrusions and defined by 1 medial and 1 lateral spine; dactylus subequal to palm or barely overriding palm corner. GNATHOPOD 2 (Fig. 15). Coxa subrectangular, length 2.2 × width; basis elongated, distal third slightly curved, length 7.3× width; ischium length 2.7 × width; carpus stout, length 2 × width, about 1.6 × propodus; propodus chelate, subovate, length 1.72 × width, widest subproximally and about 75% of the carpus width, surface finely setose with distal groups of long pectinate setae, dorsal margin strongly convex, hind margin weakly convex, nearly straight; dactylus large, inserted at the top of the distal margin and occupying most of the length (~ 85%) of the distal margin, forming a distinct, small gap on the palm. PEREOPOD 3 (Fig. 16). Coxa with anterior margin very slightly convex, posterior margin nearly straight, length 2.3× wid

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