Limnoporeia wakkine Barnard & Drummond 1978

Limnoporeia wakkine

DESCRIPTION OF FEMALE.—Female “b”: Head about 20 percent of total body length, greatest width about 40 percent of length; rostrum very long, reaching end of article 2 on antenna 1, unconstricted or weakly so apically, apex narrow but rounded, apicoventral face of rostrum weakly thickened. Eyes of medium size, subcircular, composed of black core in preservative surrounded by occasional clear ommatidia. Article 1 on peduncle of antenna 1 about 2.1 times as long as wide, twice as wide as article 2, apicoventral region with about 7 setules, strongly produced dorsal apex with 4 long setules; article 2 about 0.53 times as long as article 1, ventral apex with 5 setae; accessory flagellum 4–articulate, slightly shorter than primary flagellum, latter also 4–articulate, one aesthetasc present apically on each flagellum. Article 3 of antenna 2 with one medium-long, one short facial setae; spine formula of article 4 = 3–4–4, proximal spines thin, both proximal groups with accessory setule, dorsal margin with weak notch bearing spine, ventral margin straight and naked except for medial penicillate setules extending unusually distad, ventrodistal margin with 3 medium to long spines and group of 3 short setae; article 5 about 0.75 times as long as article 4, facial spine formula = 1 plus accessory setule, dorsal margin straight and smooth, ventral margin with acclivity bearing 2 spines plus seta and setule, dorsodistal apex with 3 short to long spines and several setae, ventrodistal apex with long spine-seta and 2 setules; flagellum as long as article 5 of peduncle, 3–articulate, basal article elongate. Prebuccal complex weakly undulant anteriorly, moderately extended forward, epistome and upper lip fused together, upper lip with weakly excavate ventral margin, weak anterior crescentic ridge. Mandibles with strong palpar hump; right incisor with 3 teeth, notches and ripples; left incisor with 7 humps in 2 branches; right lacinia mobilis broadly flabellate, bifid, proximal branch resembling raker spine with papillate setules, distal branch weakly serrate distally, one facial hump near base of proximal branch; left lacinia mobilis broadly flabellate, with 5 teeth; right rakers 2, left 3; mandibular molar large, forming plaque with apex weakly projecting and bearing 3–4 fixed spine-teeth and one complexly penicillate short seta; palp article 2 with one subbasal short inner seta, article 3 about 1.15 times as long as article 2, strongly oblique apex with 8 spine-setae. Lower lip with 4 cones on outer lobe, 2 of these facial, mandibular lobes short, almost subacute apically, inner lobes of moderate size, fused together for most of their length but aboral face bearing plaque. Inner plate of maxilla 1 large, subovate, naked, base broad; outer plate with 7 spines, none of these with cusp on opposite side; palp exceeding apex of outer plate, medium-thin, bearing 5 apical and subapical setae, most subapical setae in weak medial notch. Inner plate of maxilla 2 extremely broad and slightly shorter than outer plate, setae sparse, one medial seta and 2 large facial setae; outer plate with several medial setae. Inner plate of maxilliped with attenuate apex bearing one seta, apicolateral acclivity bearing second seta, medial margin with seta; outer plate with 3 medial spines; palp article 2 strongly setose medially (3 rows), article 3 with 4 facial setae, article 4 elongate, bearing medium apical nail, two accessory setae, one highly disjunct. Coxa 1 expanded distally; setal formula of coxae 1–4 = 6–7–8–3; coxa 4 strongly quadratiform, anterior and posterior margins parallel, posterodorsal excavation shallow but wide, V-shaped, ratio of width to length = 1:1. Gnathopod 1 especially slender, gnathopod 2 as long as but slightly stouter than gnathopod 1; long posterior setae on article 2 of gnathopods 1–2 = 1–1, short anterior setae = 3–4, no others; article 3 of both gnathopods slightly elongate but more so on gnathopod 2 (length ratio of this article on gnathopods 1–2 = 35:45); article 5 on gnathopod 1 long, with flat and free posterior margin, this article shorter on gnathopod 2, posterior margin bluntly triangular but not cryptic; article 6 of both gnathopods long, on gnathopod 2 tapering slightly but on gnathopod 1 weakly constricted in middle and reexpanding apically; strongly chelate apices of palms and curved apices of dactyls similar on both sets of gnathopods, each with long thin scale-like extension and medium spine, apical scale on dactyls scarcely distinct, pointed, essentially nail-like; length ratios of articles 5–6 on gnathopods 1–2 = 87:90 and 66:115, width ratios = 18:34 and 27:47. Pereopods 1–2 generally similar to each other and to L. ungamale but articles 5–6 slightly smaller; long posterior setae on article 2 of pereopods 1–2 = 2 and 3, short anterior setae = 5 and 5, pereopod 1 with normal distal placement of apicoposterior setal pair on article 2; articles 4–5 lacking facial armaments, article 4 with 3–4 groups of simple posterior setae (1 or 2 to 6 setae per group), produced anterodistal apex with 1–2 setae (one a setule), article 5 with dense posterior setae, long distal spine reaching almost to M. 80 on article 6; article 6 with 2 midposterior sets of 3 setae each, rarely 4 (one pereopod only), apical and posterior rows of 4 and 3 spines, spines mostly long and medium; dactyl of medium (normal) length, almost straight, lacking acclivities and setules and bearing almost fully invisible apical immersed nail. Coxae 5–7 posteroventral setule formula = 1–1–4. [Articles 6–7 of pereopod 3 and 5–7 of pereopod 4 missing]; articles 4–5 of pereopods 3–4 narrow, facial spines almost absent or weakly developed on anterior margin of articles 4–5 of pereopod 3; width ratios of articles 2, 4, 5, 6 of pereopod 3 = 65:20:16:?, of pereopod 4 = 80:25:?:?, of pereopod 5 = 100: 21:13:9, length ratios of pereopod 3 = 78:24: 28:?, of pereopod 4 = 91:65:?:?, of pereopod 5 = 110:24:35:25; article 2 of pereopod 5 exceeding apex of article 4. Posteroventral corners on epimera 1, 2, 3, = rounded (to weakly-rounded-quadrate), rounded-quadrate, and weakly but sharply protuberant, posterior margins all convex, with one setule on each epimeron, epimeron 2 with 4 facial setae, anteriormost 2 of these horizontal, posterior 2 of these set vertically (broken in illustration). Apicolateral corner of peduncle on uropod 1 smooth, with spine (as long as in L. ungamale) and one midlateral similar spine, medial margin unknown, damaged, rami of uropods 1–2 with apical nail, obsolescent but weak scale present, outer ramus of uropod 1 with 2 dorsal spines twice as long as those on L. ungamale, inner with 2 of similar dimensions, rami of uropod 2 naked, peduncle of uropod 2 with 2 lateral spines of same size illustrated for L. ungamale, ventrolateral margin of peduncle on uropod 1 with 3 short setae, combs absent on uropodal peduncles. (Uropod 3 mostly missing, unknown.) Length-width ratio of telson = 6:5, not fully cleft, each apex broad, weakly excavate but basically truncate and inwardly oblique, bearing long medial spine-seta, 0–1 small lateral seta and lateralmost setule, middorsal pair of plusetules weakly diverse, elongate. Urosomite 1 naked ventrally but with small seta at lateral base of uropod 1; urosomite 2 with similar seta. Cuticle with bulbar setules and weak striations. Gnathopod 2 with small, leaf-like gill, pereopod 5 with vestigial, knob-like gill.

Female “a,” 3.70 mm: Differences from female “b”: eyes fully clear of pigment; ventral apex of article 2 on antenna 1 with 4 setae, primary flagellum with aesthetasc also on articles 2–3; spine formula on article 4 of antenna 2 = 4–4–4, article 5 with ventral notch bearing 2 long spinules and long setule; mandibular molar with only 2 spine teeth, palpar apex with 7 spine-setae; palp of maxilla 1 with only 4 setae; long setal formula (including small posterior seta on coxae 1–3) of coxae 1–4 = (6–7)–(7)–(7–8)–(3–4); long posterior setae on article 2 of gnathopod 2 = 1, of pereopods 1–2 = 3 and 4, small anterior setae on article 2 of pereopods 1–2 = 3 and 3; article 4 of pereopods 1–2 with only 3 groups of 3–5 posterior setae; setal formula of coxae 5–7 = 1–1–2; width ratios of articles 2, 4, 5, 6 of pereopod 3 = 61:18:15:8, of pereopod 4 = 79:28:15:8, of pereopod 5 = 95:17:13:8, length ratios of pereopod 3 = 75:25:27:30, of pereopod 4 = 87:59:45:39, of pereopod 5 = 102:20:30:21; epimeron 2 with 2 ventral setae, posterior face with only one seta, epimeron 3 with or without midposterior setule notch; medial margin of peduncle on uropod 1 with 3 large spines, outer ramus of uropod 1 with only one dorsal spine, outer ramus of uropod 2 with one dorsal spine; peduncle of uropod 3 with 3 ventral spines, dorsolaterally with one spinule, medially with one spine, rami feminine, inner short and scale-like, reaching to M. 48 on article 1 of outer ramus, with one tiny apical setule, article 2 of outer ramus elongate, 0.40, bearing 2 long apical setae, apicomedial corner of article 1 with one long spine, lateral margin with 2 acclivities, spine formula = 1–2–2, setal formula = 0; length-width ratio of telson = 15:11, each apex truncatoconcave, bearing tiny lateral setule, then larger setule, then very elongate setal-spine, then shorter setal-spine and finally with small medial setule.

OBSERVATIONS (female).—Female “a” differs from female “b” primarily in the elongation of the spines in the ventral notch on article 5 of antenna 2, in the presence of only one posterior facial seta on epimeron 2 and in the much heavier apical spinosetation on each lobe of the telson.

Four females accompanying female “a,” all specimens of slightly smaller size, also have the stated spines on antenna 2 elongate and thin (either having 2 or 3) and have the normal telsonic spinosetation but like female “b” and unlike female “a” have a pair of posterofacial setae on epimeron 2. These four, like female “a,” have clear eyes. The outer ramus of uropod 1 bears either 1 or 2 spines, the inner ramus bears 2, the outer ramus of uropod 2 bears 0–1 spine, the inner ramus lacks spines. The spine formula on article 4 of antenna 2 varies in these ways: 3–3–3 and 3–3–2. Long setae on coxae 1–4 vary in these ways: 6–5–6–3, 6–5–5–3, 5–5–5–3, 5–5–5–2. Both flagella of antenna 1 bear 4 articles.

DESCRIPTION OF MALE (male “h,” holotype).—Head about 19 percent as long as body, eyes slightly enlarged, mainly obscured by pigment. Mandibles, lower lip, maxillae 1–2 as described for female “b” but see illustrations of right lacinia mobilis and mandibular palp. Article 1 of antenna 1 with numerous apicoventral setules; accessory flagellum 4–articulate; primary flagellum 5–articulate, articles 1–4 bearing large medial aesthetascs, article 1 with rows of 3, 7, and 11 aesthetascs, article 2 with 11 apical, article 3 with 8 apical, and article 4 with one apical aesthetascs (some omitted in illustration); medial face of article 1 on peduncle with small patch of fuzz. Articles 3–4 of antenna 2 with mediodorsal fuzz, article 3 with dorsodistal spine, spine formula on article 4 = 3–4–4; apical and ventral spines on article 5 thin, flagellum elongate, 17–articulate, calceoli absent (male young as evidenced by smallness of medial patch of fuzz on antennae 1–2 and shortness of inner ramus on uropod 3). No spine on maxilla 1 with opposite cuspidation. Nail on article 4 of maxillipedal palp shorter than in female. Setae on coxae 1–4 = (7)–(7)–(7)–(4–5); coxa 4 narrower than in female, ratio of length to width = 19:16. Long posterior setae on article 2 of gnathopods 1–2 and pereopods 1–2 = 1–1–3–3, short anteriors = 2–3–3–3, no others. Pereopods 1–2 alike; pereopods 1–4 generally like those of female, pereopod 5 larger; ratios of widths on articles 2, 4, 5, 6 of pereopod 3 = 59:17:15:8, of pereopod 4 = 75:26:15:8, of pereopod 5 = 100:15:13:7, ratios of lengths of pereopod 3 = 77:21:28:30, of pereopod 4 = 88:60:45:40, of pereopod 5 = 107:21:31:21; medial apex of article 6 on pereopod 5 finely combed. Epimera 1–2 lacking lateral ridge, epimeron 2 with only one small facial seta. Peduncle of uropod 1 with 4 medial spines, of uropod 2 with one large apicomedial spine, lateral margin of peduncle on uropod 1 with 1–2 spines, apex with 1, peduncle of uropod 2 with either 3 or 4 dorsal spines. Rami of uropod 3 submasculine, inner reaching to M. 70 on article 1 of outer ramus, apex with 2 setae, medial margin setose, lateral margin with one seta, article 2 of outer ramus elongate, bearing 2 medium and short apical setae, lateral margin of article 1 with 2 acclivities, spine formula = 1–2–1, setal formula = 1–1–2, medial margin setose. Telson elongate, ratio of length to width = 8:5, each apex with 5 elements as in female “a” but elements shorter. Pipes and bulbar setules of cuticle much sparser than in female.

OBSERVATIONS.—Male “h” and female “b” with 3 coarse serrations apicoventrally on peduncle of uropod 2, uropod 1 with fine comb apicoventrally, male otherwise smooth, female additionally with fine apicolateral comb on uropod 1, smooth on uropod 2.

ILLUSTRATIONS.—Many features of this species are so similar to those shown for L. ungamale that duplicate illustrations have been omitted, particularly those for the following list of parts: antenna 1, maxilla 1, outer plate and article 3 of maxilliped, gnathopod 1, generalities and especially dactyls of pereopods 1–2. Details, however, may vary slightly as given in the description.

Ridge on epimeron 2 of Figure 263: W is ecdysis line.

Articles 4–5 of gnathopod 2 larger relative to article 6 than in ungamale, but gnathopods smaller overall than in L. ungamale; anterior spines on article 2 of pereopod 4 longer than in L. ungamale (see illustration); article 2 of pereopod 5 slightly broader and longer relative to pereopod 5 of L. ungamale (see dimensions in description; images of pereopod 5 from both species superimposed on each other by matching length of anterior margin on article 2).

HOLOTYPE.—WAM, male “h,” 4.72 mm.

TYPE-LOCALITY—WAM 416-73, trawl sta 6, 24 Jul 1943, Jibbon Point, off Cronulla, New South Wales, Australia, depth and bottom unknown.

VOUCHER MATERIAL.—Type-locality: female “f,” 2.81 mm. CPBS 51N/172: female “b,” 4.24 mm (illus.). WAM 415-73: female “a,” 3.70 mm (illus.); female “c,” 3.95 mm; female “d,” 3.82 mm; female “e,” 3.91 mm; female “j,” 4.12 mm.

DISTRIBUTION.—Victoria, Western Port, 15–16.5 m; New South Wales, off Jibbon Point, 35 m, sand.