Ganba pellati Barnard & Drummond 1978

Ganba pellati

DESCRIPTION OF FEMALE.—Head about 20 percent of total body length, greatest width about 70 percent of length; rostrum unconstricted, broad, exceeding apex of article 1 on antenna 1. Eyes medium, largely occluded with pigment. Article 1 on peduncle of antenna 1 about 1.8 times as long as wide, about 1.5 times as wide as article 2, ventral margin with about 6 apical setules, weakly produced dorsal apex with 2 setules; article 2 about 0.4 times as long as article 1, naked ventrally; primary flagellum with 8 articles, about 0.8 times as long as peduncle, bearing numerous short aesthetascs; accessory flagellum with 5–6 articles. Spine formula on article 4 of antenna 2 = 2–2–3 or 2–2–4, dorsal margin with notch bearing one seta and 2 spines, ventral margin with 3 pairs of long to short setae, 2 ventrodistal medium to short spines; article 5 about 0.67 times as long as article 4, facial spine formula = 0, dorsal margin naked, ventral margin with 3 pairs of 2 long to short setae, 3 ventrodistal short to medium spines, one of these set as subdistal facial spine; flagellum about as long as articles 4–5 of peduncle combined, with 8 articles. Mandibles with medium palpar hump; right incisor with 3 teeth and notch; left incisor with 4 humps in 2 branches; right lacinia mobilis bifid, distal branch much shorter than proximal, forming cusp, proximal branch simple, pointed; left lacinia mobilis with 4 teeth plus 2 accessory teeth; right rakers 6; left rakers 6; molar of short protrusion demarcated mainly by spines, each molar with 3 long spines, none disjunct; palp article 1 slightly elongate, article 2 with one short inner apical seta and one other short inner seta, article 3 about 1.2 times as long as article 2, truncate apex with 5–6 spine-setae, basofacial formula = 0–1. Inner plate of maxilla 1 especially broad, bearing one long apical pluseta, one shorter similar apicomedial seta, no apicolateral setae; palp article 2 with 2 apical–medial marginal spines and 3–4 submarginal setae. Inner plate of maxilla 2 shorter and much narrower than outer, outer with 4 apicolateral setae, inner with one medial seta. Inner plate of maxilliped with 4 large thin apical spine-setae, no apicofacial setae, no medial setae, inner plates mostly fused together; outer plate with 4 medial and apical spines, no apicolateral setae; palp article 1 with apicolateral seta, article 2 with one apicolateral seta, medial margin of article 2 moderately setose, article 3 with 4 facial setae, no lateral setae, nail of article 4 medium–short, with one accessory setule. Coxa 1 expanded distally, anterior margin weakly concave, main ventral setae of coxae 1–4 = 5–5–5–0, all four with anterodorsal hump, posteriormost seta of coxae 1–3 shortest; anterior and posterior margins of coxa 4 almost parallel, posterior margin almost straight, posterodorsal corner rounded, posterodorsal margin short, concave, V-shaped, width–length ratio of coxa 4 = 1:1. Long posterior setae on article 2 of gnathopods 1–2 and pereopods 1–2 = 2–(1–3)–(4–5)–(4–5), short posteriors = (2–3)–(2–3)–(3–4)–(3–4), long anteriors = 2–3–0–0, short anteriors = 1–2–2–(1–2), no others. Gnathopod 1 thin, elongate; gnathopod 2 enlarged, weakly elongate, hands tapering distally; width ratios of articles 5–6 on gnathopods 1–2 = 23:28 and 26:39, length ratios = 71:100 and 50:88; palmar humps ordinary, palms strongly oblique; article 5 of gnathopod 1 elongate, ovate, posterior margin rounded–truncate; article 5 of gnathopod 2 short, triangular, cryptic. Pereopods 1–2 similar, facial setae formula on article 4 = (1–2) and (2–3) on article 5 = (1–2) and (1–3); main spine of article 5 extending to M. 50 on article 6, article 5 lacking proximoposterior spines; spine formula of article 6 = 2 + 4 plus midposterior seta, spines especially short, acclivity on inner margin of dactyls of pereopods 1–2 absent, setule fully immersed, midfacial pluseta short, highly proximal. Coxae 5–7 posteroventral setule formula = 1–1–1, articles 4–5 of pereopods 3–4 medium narrow, facial spine rows sparse; facial ridge formula on article 2 of pereopods 3–5 = 0–1–1; width ratios of articles 2, 4, 5, 6 of pereopod 3 = 49:29:25:13, of pereopod 4 = 63:25:19:12, of pereopod 5 = 79:18:14:9, length ratios of pereopod 3 = 68:30:30:32, of pereopod 4 = 84:40:38:41, of pereopod 5 = 100:25:22:28; article 2 of pereopod 5 reaching middle of article 4; medial apex of article 6 finely combed, truncate. Posteroventral corner of epimeron 1 rounded, posterior margin weakly convex, anteroventral margin with 4–7 short to medium setae, posteroventral face with one short seta; posteroventral corner of epimeron 2 rounded, weakly protuberant, posterior margin straight, facial setae = 3–4, posteriormost pair set vertically if 4 setae present; posteroventral corner of epimeron 3 weakly protuberant, with setule sinus, posterior margin weakly convex, with 2 setule notches, ventral margin naked; epimera 1–2 with tiny setule on posterodorsal margin. Urosomite 1 with ventral seta and setule at base of uropod 1, articulation line almost complete; urosomite 3 unprotuberant dorsally. Rami of uropods 1–2 with immersed apical nails; outer ramus of uropod 1 with one dorsal spine, inner with none; rami of uropod 2 naked; peduncle of uropod 1 with 3 apicolateral spines and one short basofacial seta, medially with 3 marginal spines, apicalmost enlarged; peduncle of uropod 2 with 6–7 dorsal spines, medially with one large apical spine; apicolateral corners of peduncles on uropods 1–2 lacking comb. Peduncle of uropod 3 with 5 ventral spines (one disjunct), dorsally with one lateral spine, one medial spine; rami feminine, inner extending to M. 66 on article 1 of outer ramus, apex with one seta, medial margin with one apical seta, article 2 of outer ramus short, 0.14, bearing one long seta, medial margin of article 1 with 3–4 setae, lateral margin with 3 acclivities, spine formula = 0–1–1–1, setal formula = 1–1–1–1. Telson ordinary, length-width ratio = 11:10, almost fully cleft, each apex narrow, rounded, lateral acclivity deep, bearing ordinary lateral setule, spine next medial of length subequal to setule, midlateral setules diverse. Cuticle with ordinary but sparse bulbar setules.

OBSERVATIONS.—Long posterior setae on article 2 of gnathopods 1–2 and pereopods 1–2 with occasional short partners or extra short setae between long members, article 2 of pereopods 1–2 with only one anterior setule; pereopods 1–2 with one posterior seta on article 6 besides spines; facial setae on article 5 of pereopods 1–2 highly posteriad.

Young female: Easily recognizable because of general specific characters on epimera, head and gnathopods but following external observations included: article 6 of pereopods 1–2 with only one posterior spine besides locking spines and one seta; coxae 1–3 with only 3 ventral setae each; uropod 1 with one basofacial seta, 2 apicolateral spines, outer ramus with one long spine; peduncle of uropod 2 with 4 spines; outer ramus of uropod 3 with one lateral acclivity bearing one spine only; epimeron 1 with 3 anteroventral and no posterofacial setae, epimeron 2 with 2 setae, epimeron 3 with only 2 posterior setule notches; article 5 of antenna 2 with only one posterior set of spine-setae, article 4 like adult.

Juveniles: Smallest 1.47 mm, (Slack-Smith 1), generally recognizable because of distinct elongation of article 6 on gnathopod 1; following notes showing reduction in spination on prominent external appendages: spine formula on article 4 of antenna 2 = 1–1–1 (or 2–1 depending on view); coxae 1–3 with one seta each; epimera 1–2 lacking setae; peduncle of uropod 1 with one lateral spine, peduncle of uropod 1 with one lateral spine; rami of uropods 1–2 dorsally naked.

VARIATIONS.—Smaller female “q,” 4.45 mm, from Shepherd 15 (South Australia) better developed morphologically than holotype female from Western Australia, generally more spinose and setose, upper lip with heavy crescentic rugosity, eyes larger but following parts not compared because of damage to female “q”: articles 6–7 of pereopods 1, 2, 4, 5 and uropod 3; holotype with aberrantly vestigial outer plate of maxilla 2.

ILLUSTRATIONS.—Whole views of gnathopods 1–2 with article 6 not fully flattened, this shape shown on setoseless outline views; distinctions between spines and setae on palp of maxilla 1 described mainly by their positions because these armaments highly similar to each other; view of left pereopod 3 reconstructed from right appendage; setule on coxa 7 omitted.

HOLOTYPE.—WAM, female “a,” 5.25 mm.

TYPE-LOCALITY.—Slack-Smith 1, 4 Dec 1968, Cheyne Beach, Albany, Western Australia, on weedy rocks, intertidal.

VOUCHER MATERIAL.—Shepherd 15, female “q,” 4.45 mm (illus.); JLB AUS 13, juvenile “c,” 3.34 mm; Slack-Smith 1, juveniles, smallest 1.47 mm (6). Male unknown.

MATERIAL.—Slack-Smith 1, one sample (7); JLB AUS, one sample (1); Shepherd 15, one sample (1).

DISTRIBUTION.—Albany, Western Australia to Pearson Island, South Australia, 0–8 m.

Kuritus, new genus

DIAGNOSIS OF MALE.—Eyes present. Flagella of antennae 1–2 unreduced in male. Article 2 of antenna 1 especially shortened, ventral setae confined apically. Article 1 of antenna 2 not ensiform, article 3 with 2 setules, facial spines on article 4 weakly in 2 rows, article 5 ordinary in size. Right mandibular incisor with 3 teeth; molar not triturative, small, conical, bearing 3 long clumped spines, lacking fuzz; palpar hump small. Palp of maxilla 1 biarticulate; inner plate with 2 setae. Setation of maxilla 2 weak. Inner plates of maxillipeds ordinary; apex of palp article 3 not protuberant, dactyl elongate, apical nail distinct, elongate, Gnathopods small, similar; article 5 of gnathopods 1–2 of ordinary length, free, without eusirid attachment; palms oblique, hands of gnathopods 1–2 ordinary, ovatorectangular, elongate, poorly setose anteriorly. Article 5 of pereopods 1–2 setose posteroproximally. Article 2 of pereopod 3 of broad form, articles 4–5 of pereopods 3–4 narrow to medium, article 2 of pereopods 3–4 not setose posteriorly; pereopod 5 ordinary, article 2 naked ventrally, article 3 ordinary, dactyl normal. Epimera 1–2 lacking long posterior setae, without midfacial setae above ventral facial ridge; epimeron 3 of rounded classification and lacking long setae. Urosomite 1 generally naked; urosomite 3 without dorsal hook or special process. Peduncle of uropod 1 normally elongate, without apicoventral spike, with special enlarged apicomedial spine; peduncular apices of uropods 1–2 combed; spine(s) on inner ramus in one row, no rami continuously spinose to apex, inner ramus of uropod 2 ordinary. Uropod 3 ordinary, elongate article 2 of outer ramus carrying 2 medium apical setae. Telson elongate, with 2 apical spines on each lobe plus setules, without special dorsal and lateral spines or setae.

DESCRIPTION OF MALE.—Rostrum fully developed. Fuzz on article 1 of antenna 1 in male present; calceoli on male primary flagellum of antenna 1 present. Calceoli on article 5 of male antenna 2 present, flagellum in male with calceoli. Prebuccal parts extended forward, poorly separated from each other, upper lip dominant. Right lacinia mobilis in 2 parts; mandibular palp thin, article 1 short, article 2 without outer setae, apex of article 3 oblique. Lower lip bearing cones. Outer plate of maxilla 1 with 9 spines, one spine especially thickened. Inner plates of maxilliped poorly armed, thick. Coxae 2–4 without special anterodorsal humps. All posterior spines on article 6 of pereopods 1–2 thin and stiff, midapical spine present. Article 2 of pereopod 5 without facial setae. Peduncle of uropod 1 with dorsolateral spines confined apically, medial spines widely spread; peduncle of uropod 2 with only one medial spine confined apically. Peduncle of uropod 3 lacking extra subapical setae or spines. Telson with ordinary pair of midlateral or dorsal setules on each side.

TYPE-SPECIES.—Kuritus nacoomus, new species.

COMPOSITION.—Unique.

RELATIONSHIP.—Kuritus differs from Brolgus and Ganba in bearing 2 apical setae on the outer ramus of uropod 3 and from Wildus and Brolgus in the thin gnathopods that are identical to each other and on which the wrists are not cryptic. See Paraphoxus for further relationships.

The type-species has an unusual right lacinia mobilis in which the two main elements are separate, the so-called distal branch being fully articulate and the proximal branch therefore resembling a raker spine. The proximal branch of the right lacinia mobilis in most phoxocephalids resembles a raker spine and may actually be a raker spine fused to the primitive lacinia mobilis. In the case of Kuritus nacoomus the proximal branch is separate but is not counted as a raker spine. In other respects morphological similarities lie with Brolgus, the telsonic spination, coxal setation, and epimeral setation indicating a relationship to B. millinus and B. mahmak.