Serejorchestia ceduna ( Serejo & Lowry, 2008 )

Myers, Alan A., Park, Eunji & J. - P, Olivier, 2025, A revision of the family Protorchestiidae (Amphipoda: Talitroidea) with the description of two new subfamilies, three new genera and one new species, Zootaxa 5725 (3), pp. 371-390 : 387

Serejorchestia ceduna ( Serejo & Lowry, 2008)

( Fig. 5 )

Protorchestia ceduna Serejo & Lowry, 2008: 196 : figs 27–29

Type locality. Ceduna, Ayr Peninsula, South Australia.

Holotype. Australian Museum P69066.

Diagnostic description. Antenna 1 long, extending to the distal end of article 5 of antenna 2; flagellum subequal in length with peduncle. Antenna 2 short, flagellum a little longer than peduncle. Mandible left lacinia mobilis 5- dentate. Maxilliped palp stout, article 4 distinct, very small. Gnathopod 1 merus, carpus and propodus each with palmate lobe. Male gnathopod 2 carpus small, cup-shaped; propodus large pyriform, palm oblique with about 8 strong robust setae and 8 smaller robust setae. Female gnathopod 2 mitten-shaped, merus, carpus and propodus each with palmate lobe. Pereopod 7 only just longer than pereopod 6. Pleopods subequal, long, peduncular margins naked. Uropod 1 peduncle subequal to rami, distolateral robust seta one third to one half length of exopodite; rami subequal; endopodite with 3 marginal robust setae, exopodite margins without marginal robust setae. Uropod 2 endopodite with 3 marginal robust setae, exopodite with 1 or 2 marginal robust setae. Uropod 3 peduncle with one marginal and two subdistal robust setae; ramus slender, subequal in length with peduncle without marginal robust setae. Telson strongly cleft, much longer than broad, narrowing and with separated lobes distally, with a pair of unequal terminal robust setae on each side. Coxal gills plate-like, unlobed. Oostegite setae with curl tips.

Habitat. Mangrove and marshes

Distribution. South Australia: Ceduna ( 32 o 8.87 ’ S 133 o 40.24E), Baird Bay, ( 33 o 43’S 134 o 16.63’E); North Beach, Wallaroo ( 33 o 54.51’S 137 o 37.77’E); Franklin Harbour, Cowell ( 33 o 41.26’S 136 o 55.65’E). Victoria: Port Albert ( 38 o 40.23’S 146 o 41.86’E).

Remarks. Serejorchestia ceduna ( Serejo & Lowry, 2008) differs from S. lakei (Richardson) in its longer antenna 1 which extends to the end of article 5 of antenna 2 (extending only about half way along article 5 of antenna 2 in S. lakei ), in having marginal robust setae on the exopodite of uropod 2 (marginally naked in in S. lakei ) and in having a slender uropod 3 ramus subequal in length with the peduncle (broader and about three quarters length of peduncle in S. lakei ).

Figures

FIGURE 5. Telsons of species of A) Serejorchestia gen. nov., B) Richardsonorchestia gen. nov. and C) Lowryorchestia gen. nov. S. lakei redrawn from Richardson (1996); S. ceduna redrawn from Serejo & Lowry (2008); R. rupestris and R. palustris redrawn from Richardson (1993); L. campbelliana redrawn from Bousfield (1964).