Foxiphalus aleuti Barnard & Barnard 1982

Foxiphalus aleuti

DESCRIPTION OF HOLOTYPE (young male “l”).—Head about 21 percent of total body length, greatest width about 75 percent of length, rostrum scarcely constricted, broad, elongate, reaching apex of article 2 on antenna 1. Eyes medium to large, clear of pigment, ommatidia ordinary. Article 1 of peduncle on antenna 1 about 1.6 times as long as wide, about 1.8 times as wide as article 2, ventral margin with about 13 setules, weakly produced dorsal apex with 2 setules-setae, article 2 about 0.5 times as long as article 1 with ventral cycle of 9 setae, primary flagellum with 18 articles, about 1.15 times as long as peduncle, bearing 1 short aesthetasc each on articles 5–17; accessory flagellum with 12 articles, only 0.6 times as long as primary flagellum. Antenna 2 weakly ensiform, apex of process turned inward; spine formula on article 4 = 1–3–5–6, dorsal margin with 1–2 notches bearing 3 and 2 setae and 2 spines, ventral margin with 7–8 groups of 1–4 mostly medium setae, 1 ventrodistal long spine, article 5 being about 0.7 times as long as article 4, facial spine formula = 3–5, dorsal margin bearing 3 sets of small setae, ventral margin with 5 sets of 1–2 long to short setae, 3 ventrodistal long to medium spines set facially; flagellum broken but clearly longer than articles 4–5 of peduncle combined.

Epistome unproduced anteriorly. Mandibles with weak palpar hump, right incisor with 3 teeth, left incisor with 3 humps in 2 branches, right lacinia mobilis bifid, distal branch long but much shorter than proximal, branches simple, pointed, left lacinia mobilis with 4 teeth, middle teeth scarcely shortened; right rakers 10 plus 1 rudimentary, left rakers 9 plus 1 rudimentary; molars composed of elongate narrow humps, each molar with about 10 spines, half short and half medium plus 1 short spine weakly disjunct; molar with plume; palp article 1 short, article 2 with 1 long and 1 short inner apical setae and 3–4 other long to short inner setae; article 3 about as long as article 2, oblique apex with 13–11 spine-setae, basofacial formula = 1–4 or 1–3. Inner plate of maxilla 1 ordinary, bearing 1 apicofacial pluseta, 1 similar apicomedial seta, 2 apicolateral much shorter setae, outer plate with 11 spines, palp article 2 with 1 apical spine, 1 apicolateral, 3 medial and 5 submarginal setae. Plates of maxilla 2 extending equally, outer not broader than inner, outer with 7 apicolateral setae, inner with 4 medial setae. Inner plate of maxilliped with 2 large thick apical spines, 2 apicofacial setae, 6 medial setae, outer plate with 9 medial and apical spines, 7 lateral setae, palp article 1 without apicolateral seta, article 2 with 2 groups of 4 lateral setae, medial margin of article 2 moderately setose, article 3 with 9 facial setae, 2 lateral setae, nail of article 4 short, fused to article 4, with 2 accessory setules.

Coxa 1 slightly expanded apically, anterior margin straight, main ventral setae of coxae 1–4 = 11–11–12–6, posteriormost seta of coxae 1–3 slightly to scarcely shortened, anterior and posterior margins of coxa 4 strongly divergent, posterior margin oblique, almost straight, posterodorsal corner sharp, posterodorsal margin long, scarcely concave, width-length ratio of coxa 4 = 7:8.

Gnathopods generally ordinary, width ratios on articles 5–6 of gnathopods 1–2 = 25:37 and 29:40, length ratios = 65:67 and 56:67, palmar humps ordinary to large, palms oblique, article 5 of gnathopod 1 elongate, ovate, posterior margin flat, long; article 5 of gnathopod 2 ovate, posterior margin rounded, short, triangular (almost lobate).

Pereopods 3–4 similar, slender!, facial setae formula on article 4 = 6 and 6, parallel to apex, on article 5 = 7 and 8, main spine of article 5 extending to M. 100 on article 6, article 5 with 2 and 2 proximoposterior spines, spine formula of article 6 = 4 + 5 and 5 + 5 plus middistal seta, some spines scarcely elongate, acclivity on inner margin of dactyls of pereopods 3–4 obsolescent, emergent setule almost fully immersed, midfacial pluseta ordinary but somewhat distad. Coxae 5–7 posteroventral setae formula = 11–9–12, article 4–5 of pereopods 5–6 narrow, facial spine rows sparse, facial ridge formula of article 2 on pereopods 5–7 = 0–1–1; width ratios of articles 2, 4, 5, 6 of pereopod 5 = 44:32:33:15, of pereopod 6 = 73:37:30:14, of pereopod 7 = 95:22:23:?,length ratios of pereopod 5 = 80:35:43:52, of pereopod 6 = 100:63:56:70, of pereopod 7 = 105:30:31:?, article 2 of pereopod 7 = reaching middle of article 4, posterior margin with 11 small serrations, appearance of pereopods 5–6 like F. similis of J.L. Barnard (1960), pereopod 5 especially thinner than in F. cognatus, pereopod 7 like plate 34H for F. obtusidens in J.L. Barnard (1960); medial apex of article 6 finely combed, bearing 7–8 digital processes (from specimen “k”).

Posteroventral corner of epimeron 1 rounded, with faint notch, posterior margin weakly convex, with 2–3 weak setae, anteroventral margin with 21 long to medium setae, posteroventral face with 1 long seta. Posteroventral corner of epimeron 2 rounded but with moderate notch, posterior margin weakly convex, setose (5), facial setae = 11 in 1 line. Posteroventral corner of epimeron 3 rounded-quadrate, posterior margin straight, serrate, setose (8) and with 1 setule notch, all setae near ventral part of margin, ventral margin with 4 setae mainly posterior.

Urosomite 1 with 1 lateral seta near base of uropod 1 and normal ventral brush, articulation line almost complete, urosomite 3 weakly protuberant dorsally. Rami of uropods 1–2 with large articulate but tightly fixed apical nails, that on inner ramus of uropod 1 not flexed but rigidly contained, outer ramus of uropod 1 with 6 small dorsal tightly packed spines, inner with 2 large spines, outer ramus of uropod 2 with 4 small dorsal tightly packed spines, inner without dorsomedial spines, peduncle of uropod 1 with 6 basofacial setae and 4 small apicolateral spines, medially with 6 marginal spines, apicalmost ordinary, plus large displaced spine. Peduncle of uropod 2 with 10 short dorsal spines, medially with 1 small apical spine; apicolateral corners of peduncles on uropods 1–2 without comb. Peduncle of uropod 3 with 7 ventral spines, dorsally with 1 lateral spine, 8 medial and dorsal setules, rami submasculine, inner extending to M. 90 on article 1 of outer ramus, apex with 3 setae, medial and lateral margins with short setae, article 2 of outer ramus short, bearing 2 setae of unknown length, medial margin of article 1 setose, lateral margin with 5 acclivities, spine formula = 1–2–1–2–1–2, setal formula = 0. Telson ordinary, length-width ratio = 19:17, not fully cleft, each apex wide, rounded, lateral acclivity broad, shallow, with short lateral and medial spines separated by short setule (right side aberrant = 1 spine, 1 vestigial setule), midlateral setules diverse, larger of medium size, each lobe with row of denticles.