Jeanjustia pedra, Lowry & Myers, 2003

Lowry, J. K. & Myers, A. A., 2003, New Amphipod Crustaceans From The Indo-West Pacific (Amathillopsidae: Eusiridae: Iphimediidae), Raffles Bulletin of Zoology 51 (2), pp. 219-256 : 221-222

Jeanjustia pedra , new species

( Figs. 2-4 )

Material examined. – Holotype – female, 5.4 mm, AM P64442, 94.5 km south south-east of Southeast Cape, V Seamount, 1400 to 1650 m, SSO1/97, stn 69(v).

Type locality. – V Seamount , 44 24.0’S 147 09.0’E – 147 10.8’E, Southern Ocean .

Description. – Head laterocephalic lobe triangular and subacute; subocular margin without notch; eyes lacking. Antenna 1 peduncle more than three times as long as h e a d; p e d u n c u l a r a r t i c l e 2 w i t h o u t s h a r p s p i n e s; accessory flagellum present, with 1 article. Mandible incisor broad, toothed, laminate; accessory setal row present; molar well developed, triturating; palp inserted distally, article 3 exceptionally elongate. Labium outer lobes not notched; inner lobes present; mandibular processes short, subacute distally. Maxilla 1 inner plate broad, subrectangular, with apical setal row; palp not flabellate, well developed, 2-articulate, article 1 short. M a x i l l a 2 i n n e r p l a t e w i t h o u t o b l i q u e s e t a l r o w. Maxilliped palp elongate, raptorial; palp with 4 welldeveloped articles; article 2 not produced.

Pereon. Body without robust setae, without spines, without carina, with single, pereonal and pleonal middorsal processes. Gnathopod 1 similar in shape to gnathopod 2, similar in length to gnathopod 2; simple, not flagellate; coxa directed ventrally, tapering and pointed; ischium short; carpus not lobate; propodus narrow, rectilinear. Gnathopod 2 simple; coxa similar in length to coxa 1, tapering, blunt ventrally; ischium short; carpus medium in length; not lobate along posterior margin of propodus; propodus narrow, rectilinear. Pereopods 3–7 merus without posteroventral lobe. Pereopod 3 coxa tapering, blunt ventrally. Pereopods 4–5 coxae not forming ventral crescentic curve. Pereopod 4 coxa with 1 ventral point. Pereopod 5 coxa without ventral points. Pereopod 6 coxa without ventral points.

Pleon. Epimeron 3 with 1 spine on posterior margin; posteroventral corner produced into a short spine. Urosomite 1 elongate, more than 3 x length of urosomite 2. Telson entire, with 2 robust setae.

Remarks. - Currently the genus Jeanjustia is monotypic. J e a n j u s t i a p e d r a d i f f e r s f r o m a l l s p e c i e s o f Amathillopsis , in the simple gnathopods 1 and 2.

Distribution. - Pedra Seamount, Southern Ocean.

Habitat. - The seamount habitat, where not destroyed by fishermen trawling for the deep water “commercial” fish species such as Orange Roughy, Hoplostethus atlanticus ( Koslow et al., 2001) , is dominated by the hard coral Solenosmilia variablilis , but includes other macroinvertebrates such as gorgonian and antipatharian corals, hydroids, sponges, ophiuroids and seastars.

Etymology. - Named for Main Pedra Seamount, near the type locality.

Figures

Fig. 2. Jeanjustia perda, new genus, new species, female, 5.4 mm, AM P64442; 94.5 km south south-east of Southeast Cape, V Seamount.

Fig. 3. Jeanjustia perda, new genus, new species, female, 5.4 mm, AM P64442; 94.5 km south south-east of Southeast Cape, V Seamount. Scale bar = 0.2 mm; antennae = 0.5 mm.

Fig. 4. Jeanjustia perda, new genus, new species, female, 5.4 mm, AM P64442; 94.5 km south south-east of Southeast Cape, V Seamount. Scale bar = 0.5mm; uropods, Telson = 0.2mm.