Richardsonorchestia rupestris ( Richardson, 1993 )

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 : 383

Richardsonorchestia rupestris ( Richardson, 1993)

( Figs 2 , 5 )

Eorchestia rupestris Richardson, 1993: 274 , figs 4–6.

Type locality. Fortescue Bay , Tasman Peninsula, Tasmania

Holotype. Australian Museum P41266.

Diagnostic description. Antenna 1 long, extending to distal end of antenna 2 article 5; flagellum exceeding length of peduncle. Antenna 2 medium, flagellum 1.5 x length of peduncle. Mandible left lacinia mobilis 4-dentate. Maxilliped palp stout, article 4 distinct, longer than basal width. Male and female gnathopod 1 merus, carpus and propodus each with palmate lobe. Male gnathopod 2 carpus small, cup-shaped; propodus large pyriform, palm very oblique with about 11strong robust setae. Female gnathopod 2 mitten-shaped, merus, carpus and propodus each with palmate lobe. Pereopod 7 slightly longer than pereopod 6. Pleopods subequal, long, peduncular margins naked. Uropod 1 peduncle longer than rami, distolateral robust seta nearly half length of exopodite; rami subequal; exopodite margins without marginal robust setae; endopodite with 3 marginal robust setae. Uropod 2 exopodite without marginal robust setae, endopodite with 4 robust setae. Uropod 3 peduncle with three subdistal robust setae; ramus three-quarters length of peduncle without marginal robust setae. Telson entire, a little broader than long and narrowing distally with a pair of unequal terminal robust setae and one pair of weak marginal setae on each side. Coxal gills plate-like, unlobed. Oostegite setae with curl tips.

Habitat. In reeds and vegetation litter at extreme high water; under rocks and gravel at high water, under cast kelp on boulders and sand, on beach under rocks at low tide.

Distribution. Tasmania: Fortescue Bay, Tasman Peninsula; Swan Island, Bass Strait; Little Chinaman Bay, Forestier Peninsula; Cascades Bay, Koonya; Blackmans Bay; Cockburn Cove; Kelly Basin; Port Davey.

Remarks. For differences between this species and R. palustris , see remarks section under that species.

Figures

FIGURE 2. Male gnathopod 2 of A. Microrchestiinae; B. Protorchestiinae. M. bousfieldi Lowry & Peart, 2010; C. notabilis (Barnard, 1935); R. rupestris (Richardson, 1993); E. rectipalma (Barnard, 1940); E. P. nitida (Dana, 1852). All redrawn from the authorities original illustrations, except P. nitida, from Bousfield (1982).

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).