Parribacus antarcticus ( Lund, 1793 )

Parribacus antarcticus ( Lund, 1793) View in CoL ( Figs. 1–2 View Fig View Fig , 4–5 View Fig View Fig )

Material examined: 1 specimen, Dasi fishing port, Yilan County, commercial trawler, 20 September 2023 ( NTOU M02622). BL = 79 mm, CL = 56 mm, CW = 47 mm, TW = 40 mm.

Description: Cephalic shield ( Fig. 4A, B View Fig ): Subrectangular, 1.2 times longer than wider, anterior margin slightly concave.

Antennule ( Fig. 4C View Fig ): 3-segmented, outer flagellum slightly shorter than inner flagellum.

Antenna ( Fig. 4C View Fig ): Segmentation indistinct, broadened at base, lateral triangular process developed, slightly longer than antennule.

Mandible ( Fig. 5A View Fig ): Left incisor process with 5 short strong teeth and 24 setae between incisor and molar processes; right incisor process with 3 strong teeth and 14 setae between incisor and molar processes.

Maxillule ( Fig. 5B View Fig ): Palp absent; coxal endites with 15 setae (2 long, strong terminal setae); basial endite with 8 setae (3 long, strong terminal cuspidate setae) and 1 short seta near posterior margin.

Maxilla ( Fig. 5C View Fig ): Scaphognathite with anterior and posterior parts significantly expanded.

First maxilliped ( Fig. 5C View Fig ): Lobe-like, undeveloped bud.

Second maxilliped ( Fig. 5D View Fig ): 5-segmented, with 0, 0, 2, 18, 5 setae; exopod bud present, coxa with 1 arthrobranch, epipod and podobranch.

Third maxilliped ( Fig. 4 A View Fig ): 6 - segmented with small exopod bud, gill buds present, with 1 pleurobranch, 1 arthrobranch and epipod with podobranch.

Pereiopods and gills ( Fig. 4A, D View Fig ): Endopod of all pereiopods missing. Exopods flagellated distally and each with about 65 annulations; pereiopods I with 1 pleurobranch, 1 arthrobranch and 2 podobranchs; pereiopods II–IV with 2 pleurobranchs, 1 arthrobranch, 2 podobranchs. Pereiopods V with 1 pleurobranch.

Pleon ( Fig. 4A, E–H View Fig ): With 6 somites plus telson, without setae, somites III– V with posterolateral spinous processes; pleopods biramous, endopod with appendix interna; uropod well developed, posterior margin extends beyond tip of telson; posterior margin of telson nearly rectangular.