Guernea (Guernea) endota J. L. Barnard 1972

Guernea endota

DIAGNOSIS (of female; male unknown).—Accessory flagellum well developed, antenna 2 unlobed; mandibular incisor with 2–4 teeth, 1 spine in spine row, molar with several setae; inner lobes of lower lip well developed and distinctly separate, weakly appressed; palp of maxilla 1 exceeding apex of outer plate, uniarticulate; inner plate of maxilla 2 reaching about 90 percent along outer plate, much thinner than outer plate and bearing 3 apicomedial and 2 medial setae; inner plate of maxilliped of medium development, palp slightly exceeding outer plate; gnathopods 1–2 equally broad; posterior lobe of coxa 5 scarcely longer than anterior lobe anterior lobe of coxa 6 of medium size; anterior setae on article 2 of pereopod 3 sparse and shorter than article 3, article 6 not elongate; pereopod 5 with large dactyl; inner rami of uropods 1–2 subequal in length to outer rami; peduncle of uropod 2 with 2 dorsal spines; telson 1.7 times as long as broad; epimeron 3 with weak posteroventral notch and sharp tooth urosomite 1 with strong dorsal hump, urosomites 2–3 (fused) low and elongate, forming stairstep, each dorsolateral ridge with about 5 spines in adult, ridges weakly serrate, medial depression between ridges covered with long setae; cuticle of body and coxae strongly polygonal.

DESCRIPTION.—Eyes with dark magenta cores in alcohol; upper lip normally rounded below; palp of maxilla 1 with distal cone, 2 apical and 1 subapical setae; base of gnathopod 1 article 2 normally S-shaped; gnathopods 1–2 with 5 medial prickle spines on hands, palms weakly scalloped, dactyls with only large inner tooth; posterior margin of article 2 on pereopod 5 minutely and irregularly serrate; apical spine of telsonic lobe surrounded by alae; uropod 1 with 5 long ventrolateral setae; urosomite 1 ventrally naked.

HOLOTYPE.—WAM, female, 3.0 mm.

TYPE-LOCALITY.—Slack-Smith 1, Cheyne Beach, east of Albany, Western Australia, intertidal, weedy rocks, 4 December 1968.

RELATIONSHIP.—This species differs from any known member of Guernea, Dexamonica, and Prinassus in the spiny and setose urosome and in the odd telsonic apices, both characters of which give G. endota the appearance of a distinct genus.

Other characters in G. endota differing from 4 other known species of Guernea in the southern hemisphere (the 3 herein plus G. timaru J. L. Barnard, in press, from New Zealand) are the fairly high dorsal hump of urosomite 1 and the plumosity (prickles) on the spines of the hands on gnathopods 1–2 (found on G. unchalka only, on setae near the dorsal margin of the hand).

MATERIAL.—The type-locality (3).

DISTRIBUTION.—Southwestern Australia, intertidal.