Narunius tallerkus Barnard & Drummond 1982

Narunius tallerkus

DIAGNOSIS.—Telson distinctly cleft, emargination weak and gaping. Apicolateral corner of peduncle on uropod 3 with thin setae. Inner rami of uropods 1–2 much shorter than outer rami. Dorsolateral margin of peduncle on uropod 2 with small setae. Spines on dactyl of pereopod 5 set singly in tandem. Dactyls of pereopods 6–7 weak. Dorsolateral armament rows on articles 1–2 of antenna 1 and article 4 of antenna 2 composed of thin setae. Epimeron 2 rounded, with 7+ facial setae in vertical row. Tooth of epimeron 3 obsolescent. Coxa 1 not larger than coxa 2; coxae 1–2 bearing only tiny setules; otherwise with generic attributes in paddle setae, coxa 3, pereopods 3–4 and 6–7.

DESCRIPTION OF FEMALE.—Holotype female “p,” 3.36 mm (New South Wales): Head about 65% as long as wide, rostrum mabout 10% as long as remainder of head. Primary flagellum of antenna 1 with 9–10 slightly thickened articles, each ringed with numerous deeply curved thin setae, each paddle-shaped at apex, plus normal aesthetasc formula = 0–0–2–2–2–2–2–1–1–0; flagellum 9-articulate. Facial formula of setae on article 1 of antenna 1 = 6 (mixed setae); on article 4 of antenna 2 = 3–7–5–26; on article 5 = 17; article 3 with 10 facial setae; flagellum with 11 articles also furnished with paddle setae. Right and left incisors apically simple, with greatly subapical boss, choppers on molar with 3 cusps; formula on right palp article 3 = 16–1–3–1, on left = 15–1–3–1. Inner plate of maxilla 1 with 1 short apical seta, 1 large apicomedial seta; outer plate with 11 spines. Plates of maxilla 2 more slender than in Urohaustorius. Inner plate of maxilliped with 6 medial setae, apical spines shorter than in Urohaustorius, outer plate with 1 apicolateral seta, palp article 2 with 7 setae in facial row, article 3 with 4 setae in facial row and 5 ventrolateral row; palp article 4 as in U. pulcus.

Coxae 1–2 each in form of parallelogram, strongly setose ventrally; coxa 3 with most of ventral margin from anterior edge to M. 90, furnished with numerous short setae (unlike Urohaustorius), then 5 long ventral setae, posterior margin with 10 setae; coxa 4 with 10 long ventral setae and 11 posterior setae. Setae of brood plates vestigial.

Wrists of gnathopods anteriorly hirsute.

Setal and spine formulas on pereopod 3 = 9, 8, 2–1–2–2–1–1, or 2–1–1–2–1–1, 6 + 4 + 1, or 5 + 4 + 1 (note 1 of 4 = seta); on pereopod 4 = 8 and 2 anterior, 7, 2–1–2–2–1, or 2–1–2–1–1–1, 5 + 4 + 1, posterior margin of articles 5–6 with partially doubled row of mostly large even serrations (like U. pulcus). Article 2 of pereopods 5–7 densely setose posteriorly; article 2 of pereopod 5 with mediofacial duplicate row of setae even denser than on posterior margin, anterior margin densely prickled, dactyl with 7 spines in tandem.

Peduncular spine formulas of pleopods 1–3 = 2 and 1, 2 and 0, 2 and 1; segmental formulas = 22–14, 17–11, 20–17 (proliferate); basal setal formulas = 14–3–4–4, 5–1–1–1, 11–2–5–4.

Epimeron 2 with 7 large and 1 small setae in vertical facial row.

Lateral margin of peduncle on uropod 1 with 6 setae and weakly extraordinary gap between ultimate and penultimate setae, apicolateral corner with 1 setule; of uropod 2 with 3 short wiry setae, apicolateral corner with 2 similar setae; dorsal setae = 3 and 1; setae of rami = 9–6 and (9–10)–5, inner rami extending 70% and 65% along outer. Apicolateral corner of peduncle on uropod 3 with 2 setules, medial margin with 4 setules in tandem, ventromedial apical rows with about 21 mixed setae; setal formula on lateral margin of article 1 on outer ramus (right side with additional long seta as shown by dots in illustration); formula = e–e–e–E–E–E–E–Ee.

Telson about 1.2 times as wide as long, cleft about 0.14 of its length, setal formula = 2P, 2, P, 2.

Lateral gland clusters developed only very weakly in pleonite 4.

Female “y,” 2.79 mm (Victoria): Formulas of armament rows on article 1 of antenna 1 =3 + 2 tiny distals; on article 4 of antenna 2 = 4–4–2–5–17; on article 5 = 14+; flagellar articles on antenna 1, primary = 9, accessory = 8, antenna 2 = 9. Left lacinia mobilis weakly bifid; formula on right and left palp article 3 = 12–1–3–1. Ventral margin of coxa 3 almost straight. Spine and setal formulas on pereopod 3 = 8, 7, 2–1–2- 1–1, 5 + 4 + 1; on pereopod 4 = 9 (= 2 anterior), 7, 2–1–2–1–1, 4 + 3+1. Dactyl of pereopod 5 with 6 spines. Epimeron 2 with 7 setae. Peduncle of uropod 1 with 6 lateral setae; of uropod 2 naked (1 apical setule only); dorsal setae = 3 and 1; setae of rami = 9–6 and 8–3. Article 1 on outer ramus of uropod 3 with 8 long lateral setae. Brood plates like holotype.

Female “f,” 2.94 mm (Botany Bay): Epimeron 2 with 8 setae. Telsonic formula = 2P, 1, P, 2; brood plates of normal form, with elongate setae.

Female “n,” 2.73 mm (New South Wales): Left lacinia mobilis weakly bifid (illus.). Serrations on articles 5–6 of pereopods 3–4 very weak; telsonic formula = 2P, 1, P, 1 (illus.), shape unusual.

Female “u,” 3.84 mm (Queensland): Dactyl of pereopod 5 with 6 spines in tandem, plus 1 facial spine paired with spine 5 (illus.). Epimeron 2 with 8 large and 2 tiny setae. Peduncle of uropod 1 with 7 lateral setae; outer ramus like holotype; peduncle of uropod 2 with only 2 apicolateral colateral setules. Telsonic setal formula = 2P, 3, P, 3 or 2P, 2, P, 3.

Female “x,” 3.41 mm (Queensland): Dactyl of pereopod 5 like female “u.”

DESCRIPTION OF MALE.—Male “k,” 2.49 mm (New South Wales): Formulas of armaments on article 1 of antenna 1 = 4; on article 4 of antenna 2 = 3–4–4–14; on article 5 = 8; dorsal article 4 also with short setae as in female; flagellar formulas, antenna 1 primary flagellum = 9, accessory flagellum = 7, antenna 2 = 8, primary flagellum thickened as in female. Proximal hump on mandibular incisors obsolescent; formula on right palp article 3 = 10–1–3–1, on left = 11–1–4–1. Mandibular lobes of lower lip blunter than in female (female like U. pulcus illustration). Maxilla 2 like female but with 6 setae in medial setal row. Inner plate of maxilliped like female, including apical spines; palp article 2 with 5 facial setae; article 3 with 3 facial and 3 ventrolateral setae or facial row composed of 3 basal and 1 distal members; dactyl with 6 setae. Coxae 1 with 11 setae; coxa 2 with 6 setae; coxa 3 illustrated, more elongate than in female. Formulas for both pereopods 3–4, posterior article 5 = 2–2–1–1, article 6 = 4 + 3 + 1; articles 5–6 lacking serrations on pereopod 3, weakly developed on pereopod 4. Dactyl of pereopod 5 shorter than in female, with 5 spines (illus.); article 2 with fewer submarginal setae. Article 4 of pereopod 6 also like female, with only 2 posterior setae; posteroventral corner of coxa 7 with only 1 long seta. Epimeron 2 with 4 setae; epimeron 3 with only 2 ventral setules total. Peduncle of uropod 1 with 5 lateral setae, of uropod 2 with 1 midlateral setule and 1 apical setule; dorsal setae = 2 and 1, setae of rami = 7–4 and 7–2. Formula of lateral small setae on article 1 of outer ramus on uropod 3 = Ee–E–E–E–Ee. Telsonic formula = 2P, 1, P, 1 (illus.).

Male “h,” 3.54 mm (robust): Primary flagellum of antenna 1 with 11 articles, accessory flagellum with 10, flagellum of antenna 2 with 12 articles; armament formula on article 4 of antenna 2 = 5–9–8–21. Right molarial chopper with at least 7 cusps; formula on right mandibular palp article 3 = 15–1–3–1. Coxa 3 with 8 long ventral and 13 posterior setae. Coxa 4 with 29 plumose setae total plus simple anteroventral seta. Spine and setal formulas on pereopod 3 = 11, 9 (and 2 anterior), 6 + 5 + 1; of article 6 on pereopod 4 = 11–14, 10, 5 + 5 + 1. Gill of pereopod 5 about as large as posterior lobe of coxa 5. Dactyl of pereopod 5 with 7 spines in tandem and facial spine forming pair with spine 5. Epimeron 2 with 14 setae (possibly more, badly occluded). Peduncle of uropod 1 with 7 lateral setae, of uropod 2 with 4 lateral setae, setae of rami = 9–6 and 10–6. Venter of peduncle on uropod 3 with 21 setae, uropod 3 otherwise illustrated. Telsonic setal formula = 4, P, 2–3, 2P (illus.).

Juvenile female “c,” 1.48 mm (Western Port): Armament formulas of article 1 on antenna 1 = 3; on article 4 of antenna 2 = 1–1–2–1–2–8; article 5 = 6 (highly distal); article 3 = 3; flagellar articles, primary of antenna 1 = 7, accessory = 6, antenna 2 = 6, aesthetascs of primary flagellum on antenna 1 = 0–1–2–2–1–1–0. Right lacinia mobilis bifid, left weakly bifid, chopper cusps = 3, very elongate; formula on right and left palp article 3 = 7–1–3–1. Medial row on inner plate of maxilla 2 with 4 setae. Palp article 2 of maxilliped with 4 facial setae, article 3 with 2 and 3 ventrolateral setae, article 4 with 5 setae (2 long apical, 1 long subapical, 2 short marginal). Coxa 1 with 7 setae; coxa 2 with 4 setae; coxa 3 with 14 short ventral setae, 5 long posteroventrals, and 3 dorsoposterior setae; coxa 4 with 11 long setae plus 1 anteroventral setule. Spine and setal formulas on pereopod 3 = 3, 3, 2–1–1, 3 + 2 + 1; pereopod 4 = 4, 2, 2–1–1, 3 + 2 + 1, spines with large sharp cusps. Pereopods 5–7 illustrated (pereopod 6 composite of right and left). Epimeron 2 with 3 setae. Uropods 1–3 and telson illustrated, uropod 3 with 2 short medial setae on peduncle and 7–8 ventral setae.

HOLOTYPE.—AM, female “p,” 3.36 mm (illus.).

TYPE-LOCALITY.—EBS 148, 500 yards (455 meters) off Towra Point, New South Wales, 30 Nov 1972, 3 m, sand and shell grit.

VOUCHER MATERIAL.—Type-locality: male “k,” 2.49 mm (illus.); female “n,” 2.73 mm (illus.); female “a,” 2.72 mm; male “v,” 2.38 mm; EBS Botany Bay 1025: female “f,” 2.94 mm; CPBS A6/5: juvenile female “c,” 1.48 mm (illus.); CPBS 26 N/2: female “y,” 2.79 mm; AM P.23293: male “h,” 3.54 mm (illus.); QM W.6384: female “u,” 3.84 mm (illus.); female “x,” 3.41 mm (illus.).

MATERIAL.—CPBS, 4 samples from 4 stations (4); PPBES, 17 samples from 8 stations (172); EBS, 2 samples from 2 stations (5); AM, 2 samples (2); QM, 3 samples (12).

DISTRIBUTION.—Victoria, Western Port and Port Phillip Bay to Moreton Bay, Queensland, 3–22 m, sand, silty sand, sand and shell, sand and weed.

Tuldarus, new genus

DIAGNOSIS.—Rostrum weak. Peduncle of antenna 1 short, stout, articles 2 and 3 of peduncle progressively shortened, weakly geniculate, primary flagellum elongate, accessory flagellum well developed or weak. Aesthetascs simple. Antenna 2 of haustorius form, article 4 expanded, article 5 small, articles 4–5 with facial armaments, article 4 with long ventral setae and subventral clusters of bifid setae. Mandibular incisors overextended, thin, essentially untoothed; right and left laciniae mobiles not alike; rakers serrate or not, 1–2 on right mandible, 2–3 on left, 1 raker on each side often rudimentary; molar broad and bulky, not strongly extended, with weak triturative surface, accessory chopper poorly developed; setae of palp article 3 awned. Mandibular lobes of lower lip well developed. Inner plate of maxilla 1 small, slender, poorly setose, outer plate apparently with 10 spines; palp slightly shortened, uniarticulate, palpar setae attached in 1 apical set. Inner plate of maxilla 2 with weakly submarginal oblique row of setae. Maxillae and maxillipeds lacking baler lobes. Outer plate of maxilliped with spines, palp article 2 expanded; article 3 elongate, dactyl cavate, multisetose.

Coxae 1–2 very small but coxa 1 larger than coxa 2; coxa 3 larger than or subequal in size to coxa 4, coxa 3 hatchet-shaped and extended posteroventrally; only coxae 2–5 with simple gills; brood plates 4 pairs, slender.

Gnathopods small, dissimilar, gnathopod 1 simple, gnathopod 2 weakly chelate (parachelate), wrists elongate, hand of gnathopod 2 weakly mitelliform. Dactyls of pereopods 3–7 distinguishable, large, dactyl of pereopod 5 lacking spines but occasionally bearing apical setae. Article 2 of pereopods 6–7 narrow (type) to strongly expanded; of pereopod 5 strongly expanded, latter of haustorius form, distal articles of pereopods 6–7 not underslung, only moderately widened, pereopods 6–7 otherwise similar, weakly dominating pereopod 5.

Peduncles of pleopods short, wider than long, pleopod 2 inferior, inner rami moderately shorter than outer. Epimeron 1 scarcely differentiated, epimeron 2 dominantly setose. Urosomite 1 scarcely produced and poorly setose ventrally. Rami of uropods 1–2 linguiform, though inner rami often reduced or vestigial, marginally setose; peduncle of uropod 1 strongly setose laterally, of uropod 2 generally lacking long setae laterally. Uropod 3 of ordinary form, outer ramus dominant and biarticulate, article 2 with 2 large apical setae. Telson short, broader than long or not greatly longer than broad, entire.

DESCRIPTION.—Eyes indistinct or poorly visible or occasionally well developed, ocular ganglia visible. Dorsolateral surface of article 1 on antenna 1 furnished with longitudinal row of armaments; article 2 densely setose dorsolaterally, groups distinguishable; article 3 poorly setose. Article 3 of antenna 2 short, poorly setose, flagellum much longer than article 4 of peduncle.

Right lacinia mobilis linguiform, left broader and often bifid. Lower lip usually with 1 cone on each outer lobe. Inner plate of maxilla 1 with very few short apical setae and 1 larger apicomedial seta; spines on outer plate mostly bifid. Inner plate of maxilliped with 2 stout apical spines. Coxae 1–2 poorly setose. Gill 2 dominant, gill 5 rarely larger, often much smaller than posterior lobe of coxa 5. Gnathopod 2 bearing surficial button combs.

Pereopods 3–4 lacking extensive secondary facial rows of spines on article 5.

Uropods 1–2 lacking huge dorsal setae on peduncle, rami lacking basoventral setae, medial margins of peduncles usually heavily setose.

TYPE-SPECIES.—Tuldarus cangellus, new species.

COMPOSITION.—Tuldarus barinius, new species.

RELATIONSHIP.—This genus differs from Urohaustorius in the absence of large stiff spines on the dactyl of pereopod 5 and the fully apical position of all setae on the palp of maxilla 1. These small differences are reinforced by the tendency for the inner ramus of uropods 1–2 to become fused to the peduncle or lost entirely; for 1 of the mandibular rakers to exist in rudimentary form; and for the tendency towards complete domination by spines in the armament row on article 4 of antenna 2. The type-species is characterized by loss of dominance by coxa 3 and by article 2 on pereopods 6–7; while the second species is characterized by total loss of inner rami on uropods 1–2.

The type-species of Tuldarus weakly replicates some tendencies seen in Narunius, such as the narrowed article 2 of pereopods 6–7 and the small coxa 3, but Tuldarus differs from Narunius in the absence of stout dactylar spines on pereopod 5 and of the special oared setae on the antennae.