Stenothoe quabara J. L. Barnard 1974

Stenothoe quabara

DESCRIPTION OF FEMALE.—Lateral cephalic lobe strongly projecting, not submammilliform, apex subtruncate, anteroventral corner of head softly quadrate, then projecting ventrally somewhat posterior to corner; prebuccal mass not bulky, epistomal and labral parts separated by weak notch, epistomal part forming small lamella projecting subconically, midcephalic keel projecting in form of strong and sharp cone slightly forward of epistome; mediodistal part of article 1 on antenna 1 not strongly extended; accessory flagellum weakly barrel-shaped, apparently bipartite, main portion with one long, one short aesthetasc, additional part with long, thick aesthetasc (but one-third size of ordinary flagellar aesthetascs); lobes of upper lip of ordinary size, projecting unequally; inner plate of maxilla 1 asymmetrically ovate, bearing one long stiff seta, palp with about seven marginal spines extending more than halfway basomedially, apicolateral margin beveled, article 1 not tumid; inner plate of maxilla 2 freely projecting, subfalcate, bearing about two medial setae and pair of apical spines, outer plate short, curved medially, some setal spines long; inner plates of maxilliped of medium length, broad, each bearing two setae, outer plate slightly reduced from ordinary size, article bearing outer plate facially naked; coxae 1–4 of ordinary dimensions, ventral margin of coxa 4 convex; article 5 of gnathopod 1 with posterior lobe of medium breadth and scarcely projecting, hand long, palm strongly oblique and weakly marked from posterior margin of hand, dactyl with about two small facial setae (one outer, one inner), inner margin with subapical tooth, anteromedial margin of hand with group of four facial setae; article 4 of gnathopod 2 extended acutely, narrow posterior lobe of article 5 extending out to tooth of article 4, hand elongate, palm very oblique and scarcely distinct from posterior margin of hand, weakly setose, palm defined by one or two, long or short, medial spines and two lateral spines (long or short), dactyl simple, with about two outer setae scarcely facial; pereopods 1–2 not grossly distinct from each other, pair of locking spines on all pereopods composed of thin flexible setae directly adjacent to first regular marginal spine, dactyl with thin, erect distal setule; article 2 of pereopods 4–5 equally broad, anterolateral facial ridge curving posteriorly away from anterior margin at significantly ventrad level; peduncle of uropod 1 lacking ventral tooth, distolateral margin of peduncle usually with one spine, rarely (on holotype, on one side only), with pair of spines closely crowded together, rami of uropod 1 extending equally, each with about three spines, outer ramus of uropod 2 only half as long as inner and usually naked, rarely with one marginal spine, inner ramus with two spines; peduncle of uropod 3 with three dorsomarginal spines and pair of dorsodistal spines, article 1 of peduncle with one dorsal spine, then pair of spines, finally pair of distodorsal spines; telson short and broad, with three spines basolaterally on each side, four distal setules; epimera 1–3 each with small blunt posteroventral tooth, epimeron 1 with several ventral setules or one only.

MALE.—Eyes enlarged, with six rows of ommatidia (4 in female); midcephalic keel much longer and sharper than in female; anterofacial row of setae on hand of gnathopod 1 with five setae, dactyl with two facial and one outer setae; gnathopod 2 with three defining spines medially, dactyl with only one outer seta besides regular basal seta.

JUVENILE (1.7 mm).—Eyes with only three rows of ommatidia; locking spines of pereopods stouter than in adult and more like those shown for S. allinga but dactyl with erect setae as in adult; outer ramus of uropod 1 with one spine, inner with none; peduncle of uropod 3 with two spines, apical position not paired, article 1 of ramus with only one pair of distal spines, no others; telson with two lateral spines on each side.

ILLUSTRATIONS.—The following characteristics have not been illustrated because they correspond to those shown herein for S. allinga: female eye, coxae 1, 2, 4, long setae of anterior margins on article 6 of pereopods 1–2 and posterior margins of pereopods 3–5, epimera; the following parts correspond to those shown for S. ?miersi: inner plate of maxilla 1, palp of maxilla 1 except for presence of two facial setae on palp and article 1 of palp not strongly swollen.

VARIATIONS.—The peduncle of uropod 3 and the telson commonly have the basal spine in each case absent in small adults.

HOLOTYPE.—WAM 131–71, female, 3.0 mm.

TYPE-LOCALITY.—JLB Australia 11, Middleton Beach, Albany, Western Australia, intertidal, wash of algae and rocks, 30 September 1968.

DISTRIBUTION.—South Australia, Pearson Islands, 5–35 m; Western Australia, Cheyne Beach to Cottesloe (Perth), intertidal.