Serejorchestia lakei ( Richardson, 1996 )

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 lakei ( Richardson, 1996)

( Figs 3–5 )

Protorchestia lakei Richardson, 1996: 574 , figs 1–4.

Type locality. Maatsuyker Island , Tasmania .

Holotype. Australian Museum P45574.

Diagnostic description. Antenna 1 medium, extending halfway along 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, longer than basal width. Gnathopod 1 merus, carpus and propodus each with palmate lobe. Male gnathopod 2 carpus small, cup-shaped; propodus large pyriform, palm very oblique with many strong robust setae. Female gnathopod 2 mitten-shaped, merus, carpus and propodus each with palmate lobe. Pereopod 7 a little longer than pereopod 6. Pleopods subequal, long, peduncular margins naked. Uropod 1 peduncle longer than subequal length rami; distolateral robust seta less than half length of exopodite; endopodite with 2 marginal robust setae, exopodite without marginal robust setae. Uropod 2 exopodite without marginal robust setae, endopodite with 2 marginal robust setae. Uropod 3 peduncle with one marginal and two subdistal robust setae; ramus three quarters length of peduncle without marginal robust setae. Telson strongly cleft, a little longer than broad, narrowing and with separated lobes distally with a pairs 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 vegetation and seepage near sea-bird rookery, in thin films of water over stones and wood.

Distribution. Known only from the type locality.

Remarks. For differences between this species and S. ceduna (Serejo & Lowry) see the remarks under that species.

Figures

FIGURE 3. Oostegites of A. Microrchestinae and B. Protorchestinae. Cochinorchestia metcalfeae redrawn from Lowry & Peart (2010); Microrchestia bousfieldi redrawn from Lowry & Springthorpe (2015); Protorchestia nitida redrawn from Bousfield (1982); Lowryorchestia campbelliana redrawn from Bousfield (1964); Richardsonorchestia palustris redrawn from Richardson (1993); Serejorchestia lakei redrawn from Richardson (1996).

FIGURE 4. Antenna 1 and antenna 2 of Protorchestiinae. P. nitida Bousfield redrawn from Bousfield (1982); R. palustris redrawn from Richardson (1993); S. lakei redrawn from Richardson (1996).

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).