Hoho fenwicki, Hughes, 2011

HUGHES, L. E., 2011, New species of Hoho, Mallacoota and Parelasmopus (Maeridae: Amphipoda) from Australian waters, Zootaxa 2955 (1), pp. 1-79 : 8-11

Hoho fenwicki sp. nov.

(Figs 4, 5)

Type material. Holotype, male, 5.9 mm, 3 slides, AM P.85184 . Paratypes: 1 male, 7.1 mm, 4 slides, AM P.85185; female, 7.0 mm, 3 slides, AM P.85186 20+ specimens, AM P.77490, north-east side of Little Broughton Island, north-east of Port Stephens , New South Wales (32°37”05’S 152°20”06’E), 17.3 m, orange curly bryozoans, 11 March 2006, coll. S. Keable, RV Baragula ( NSW 2933 ) .

Additional material examined. South Australia: 2 males, 6 females, SAMA C6584 , approximately 3 km west north-west of Margarett Brock Lighthouse, off Cape Jaffa (36°57’9”S 139°39’51”E), 13–19 m, reef, ridges, crevices, overhangs and a few sand pockets, 17 February 1989, coll. W. Zeidler and K.L. Gowlett-Holmes.

Western Australia: 6 males, 4 females, AM P.79399, 1 km west of Red Bluff, Kalbarri (27°42'S 114°09'E), 18 m, kelp bed Ecklonia sp. , rocky bottom, curly bryozoans, 9 January 1984, coll. J.K. Lowry (WA 452); 30 specimens, AM P. 79320, 500 m off Chinaman's Rock, Kalbarri (27°42'S 114°09'E), 6 m, rocky bottom, pink curly bryozoans (Mapletsonia sp., Thalamoporella sp. and Orthoscuticella sp. Id: P.S. R. Nair), 10 January 1984, coll. R. T. Springthorpe (WA 460); 1 males, 4 females, AM P.79402, off south-east corner of Michealmas Island, King George Sound (35°03'S 118°00'E), 18 m, curly red bryozoans, 17 October 1983, coll. J.K. Lowry (WA 197); 4 males, 7 females, AM P.79403, off south-east corner of Michealmas Island, King George Sound (35°03'S 118°00'E), 18 m, curly red bryozoans, 17 October 1983, coll. J.K. Lowry (WA 197); 1 male specimen, AM P.79390 West Island, south-east of Hopetoun (33°57' S 120°07'E) 15 m, on algae, 12 May 1973, coll. S. Shepherd (WA 5); 1 male, 2 females, MV J62165 , eastern end Thistle Cove, (34°00’S 122°12’E), 10 m, 11 April 1984 ( SWA 31).

Type locality. North-east side of Little Broughton Island, north-east of Port Stephens , New South Wales (32°37”05’S 152°20”06’E).

Etymology. Named for Graham Fenwick, co-author of the genus Hoho .

Description. Based on male, 5.9 mm, AM P.85184.

Head. Eyes ovate; lateral cephalic lobe broad, truncated, anteroventral margin with notch/slit. Antenna 1 longer than antenna 2; peduncular article 1 subequal in length to article 2, with 3 robust setae along posterior margin; article 2 longer than article 3; flagellum articles longer than broad, with 18+ articles; accessory flagellum minute with 2 articles. Antenna 2 peduncular article 2 cone gland reaching at least to end of peduncular article 3; article 4 longer than article 5; flagellum with 8 articles. Lower lip outer lobes with two pair of ducts, mandibular lobes apically rounded or subacute. Mandible accessory setal row well developed with 3 setae; molar well developed, triturative; mandibular palp reduced, 1-articulate; article 1 about 4 times as long as broad.

Pereon. Gnathopod 1 coxa anterior margin concave, anteroventral corner produced, rounded; carpus about twice as long as broad, subequal in length to propodus; propodus medial surface with comb, palm acute, convex, entire, defined by posterodistal corner, with 1 robust setae. Gnathopod 2 subchelate; basis slender, anterodistal corner with well developed rounded paired lobes; merus with rounded distoventral corner; carpus compressed, lobate, projecting between merus and propodus; propodus massive, with clusters of long slender setae along posterior margin, palm straight, sculptured, about half length of propodus, subquadrate distomedial shelf with 9 robust setae, palmar margin with 2 excavations, 1 subacute tooth bearing 3 robust setae, subpalmar surface with dense medial setal bunch, palm defined by subacute posteroventral tooth, without posterodistal robust setae; dactylus with posteroproximal shelf, apically subacute, closing along palm. Pereopod 4 coxa posteroventral lobe well developed, with subrectangular posteromedial corner. Pereopods 5–7 basis slightly expanded, posterior margin minutely castelloserrate, without long slender setae; merus and carpus not broadened; propodus not expanded posterodistally; dactylar ungues simple. Pereopods 5–6 basis, posterior margin straight, posteroventral corner broadly rounded. Pereopod 7 basis posterior margin convex, posteroventral corner broadly rounded. Pereonite 7 without carina.

duced. Urosomite 1 bicarinate, carinae subtriangular. Urosomites 2–3 without carina. Uropod 1 peduncle with 1 basofacial seta; outer ramus slightly shorter than inner ramus. Uropod 2 outer ramus slightly shorter than inner ramus. Uropod 3 rami distally truncated, apical robust setae long; inner ramus short, (length twice the breadth), subequal to outer ramus; outer ramus longer than peduncle. Telson deeply cleft, lobes divergent, tapering distally, with longer outer and shorter inner apical conical extensions, each lobe with three long and one short apical robust setae.

Female (sexually dimorphic characters), based on AM P.85186. Gnathopod 2 carpus short, not lobate,

enclosed by merus and propodus; propodus linear, with slender setae along posterior margin, palm about one third length of propodus, without distomedial shelf, palmar without teeth, margin lined with a row of robust setae, defined by posteroventral corner, with 4 posterodistal robust setae; dactylus without posteroproximal shelf.

Remarks. Hoho fenwicki sp. nov. has the male gnathopod 2 propodus palm with a well developed midpalmar tooth and palm defining posterodistal tooth which distinguish it from all other Hoho species. Three species, H. fenwicki sp. nov., H. tricarinata sp. nov. and H. wittecarra sp. nov. have carinations on pleonites 1 to 2, which are bicarinations in H. fenwicki sp. nov. and H. wittecarra sp. nov. and tricariante in H. tricarinata sp. nov.

Distribution. Australia. New South Wales: Port Stephens. South Australia: Cape Jaffa. Western Australia: Kalbarri; King George Sound (current study).