Stenothoe nonedia J. L. Barnard 1974

Stenothoe nonedia

DESCRIPTION OF FEMALE.—Lateral cephalic lobe weakly projecting, not mammilliform, apically truncate, anteroventral corner of head with strong, rugose projection; prebuccal mass moderately bulky, protuberant, epistomal and labral parts scarcely distinct, epistomal part forming rounded linguiform piece projecting strongly in front of scarcely extended, midcephalic keel; mediodistal part of article 1 on antenna 1 not strongly extended; accessory flagellum small, bipartite, bearing two sharp setules; lobes of upper lip ordinary, unequally projecting; inner plate of maxilla 1 asymmetrically ovate, bearing long seta, palp with six or seven marginal spines reaching halfway mediobasally, apicolateral margin not beveled, article 1 not swollen; inner plate of maxilla 1 weakly subfalciform, with two medial setae and pair of terminal setae, one elongate, outer plate long and thin, curving medially, with some setae elongate; inner plates of maxilliped slightly elongate and widened apicalwards, bearing three or four apical setae, outer plate of ordinary size, article bearing outer plate lacking facial setae; coxae 1–4 of ordinary dimensions, ventral margin of coxa 4 convex; article 5 of gnathopod 1 scarcely lobate, article 5 trianuglar, hand short, palm oblique, dactyl with one outer seta, inner margin lacking tooth, anteromedial margin of hand with transverse row of three setae and one other seta; gnathopod 2 ordinary, article 4 with sharp posterodistal corner, palm oblique but well marked from posterior margin of hand, dactyl lacking tooth and outer seta; pereopod 2 grossly distinct from pereopod 1, stouter and shorter and more strongly spinose, pereopods 4–5 like pereopod 2 but pereopod 3 somewhat intermediate in stoutness and spination between pereopods 1 and 2, article 2 of pereopod 4 narrower than that of pereopod 5 but not strongly so, anterolateral ridge of pereopod 5 scarcely diverging from anterior margin, obsolescent on pereopod 4, pair of locking spines on all pereopods distinct from adjacent marginal spines, slightly blunted, dactyls of all pereopods with subdistal membranous setule tightly recumbent; peduncle of uropod 1 lacking ventral tooth, distolateral margin with two apical spines slightly crowded together, rami extending subequally, both spinose, outer ramus of uropod 2 shortened but both rami spinose; peduncle of uropod 3 with one or two dorsal marginal spines and one dorsodistal spine, article 1 of ramus with pair of distal spines; telson with two or three mediolateral spines on each side, with or without one or two distal setules; epimera 1 and 3 with softly quadrate posteroventral corner, epimeron 2 with small posteroventral cusp, epimeron 1 with about four ventral setules.

MALE.—Unknown.

JUVENILE (1.6 mm).—All rami of uropods 1–2 with one spine each except outer ramus of uropod 1 with two spines; telson with three spines on each side.

HOLOTYPE.—WAM 132–71, female, 2.7 mm.

TYPE-LOCALITY.—JLB Australia 4, Sugarloaf Rock, Cape Naturaliste, Western Australia, intertidal, wash of algae, mainly green Caulerpa species 1 September 1968.

RELATIONSHIP.—This species resembles S. woka, new species, but coxa 4 is normal, pleonite 4 is not elongate and scarcely crested, the outer ramus of uropod 2, though short, has two spines in the adult (against 0 or 1), the peduncle of uropod 3 has three spines instead of one, article 1 of the ramus has two spines instead of a setule, the ocular lobe is produced only weakly, and granules are absent on the pereopods. Article 2 of pereopod 4 is wider and better ornamented than it is in S. woka.

Because article 2 of pereopod 4 is narrower than article 2 of pereopod 5, this species appears similar to S. monoculoides (Montagu) of the North Atlantic; the outer ramus of uropod 2 on S. nonedia is also slightly shortened as in S. monoculoides but the following distinctions hold for S. nonedia: article 4 of gnathopod 1 underrides article 5, the telson and rami on uropod 2 have spines and the ocular lobe is truncate.

MATERIAL.—JLB Australia 4 (2).

DISTRIBUTION.—Cape Naturaliste, Western Australia, intertidal.