Lepidepecreoides chincui, Lowry & Stoddart, 2002

Lowry, J. K. & Stoddart, H. E., 2002, The Lysianassoid Amphipod Genera Lepidepecreoides and Lepidepecreum in Southern Waters (Crustacea: Lysianassidae: Tryphosinae), Records of the Australian Museum 54 (3), pp. 335-364 : 340-343

Lepidepecreoides chincui n.sp.

Figs. 4–6

Type material. HOLOTYPE, female, 5.8 mm, non-ovigerous with long setose oostegites, SMNH 5250; 1 PARATYPE, juvenile, 3.5 mm, SMNH 5251; Bahía Chincuí , Seno Reloneavi, southern Chile, eastern South Pacific Ocean, 41°32'00"S 73°01'30"W, 70–80 m, fine soft grey sand with small stones, 16 July 1949, LUCE stn M145A. —1 PARATYPE, 4.0 mm, AM P57733, Piedra Azul , NW of Punta Quillaipe , Seno Reloneavi, southern Chile, eastern South Pacific Ocean, 41°31'30"S 72°48'15"W, 30 m, hard grey coarse sand, 14 December 1948, LUCE stn M16E .

Type locality. Bahía Chincuí , Seno Reloneavi, southern Chile, eastern South Pacific Ocean, 41°32'00"S 73°01'30"W, 70–80 m depth .

Description. Based on holotype female, 5.8 mm. Head with lateral cephalic lobe subtriangular, apically subacute; eyes apparently absent. Antenna 1 peduncular articles 1 and 2 without anterodistal lobe; accessory flagellum 2-articulate, with terminal article small, offset; flagellum with strong 2- field callynophore; robust setae present on proximal articles; calceoli absent. Antenna 2 flagellum short, calceoli absent. Epistome/upper lip with epistome less produced than upper lip, straight; upper lip produced, rounded apically. Mandible molar columnar with oval, fully triturating surface; palp attached distally, article 3 with proximal A3-seta. Maxilla 1 outer plate with left and right setal-tooth 7 symmetrical, cuspidate distally along inner margin; palp distal margin with apical robust setae. Maxilliped outer plate with 2 (one long slender, one short broad) apical robust setae.

Gnathopod 1 simple; coxa large, about as long as coxa 2, subrectangular with straight anterior margin; basis sparsely setose along anterior margin; ischium short; carpus long (3.0 × breadth), longer than propodus, without posterior lobe; propodus small, margins subparallel, palm absent. Gnathopod 2 palm slightly obtuse. Pereonite 3 dorsally smooth. Pereonite 4 dorsally smooth. Pereopod 4 coxa with a weak posteroventral lobe (posterior margin concave). Pereonite 5 without mid-dorsal carina. Pereopod 5 coxa without distinct lateral ridge; basis about as long as broad, posterior margin with mid-central spine, with well-developed posteroventral lobe. Pereonite 6 dorsally smooth. Pereonite 7 dorsally smooth. Pereopod 7 basis posterodistally produced, not reaching merus, not posterodistally excavate.

Pleonite 1 dorsally smooth. Pleonite 2 dorsally smooth. Pleonite 3 with mid-dorsal carina, dorsally rounded, dorsodistally produced, apically rounded, posterodorsal margin produced. Epimeron 3 posterior margin smooth, posteroventral corner broadly rounded. Urosomite 1 without notch, with a narrow vertically produced recurved acute spine. Uropod 3 outer ramus article 2 short, with plumose setae on each ramus. Telson deeply cleft, with dorsal robust setae, with 1 long apical robust seta on each lobe.

Etymology. Named after Bahía Chincuí, the type locality.

Remarks. Lepidepecreoides chincui is the only species of Lepidepecreoides with a simple gnathopod 1. It is also the only species recorded from less than 100 m depth.

Distribution. Southern Chile, eastern South Pacific Ocean; 30–80 m depth.

Figures

Figure 4. Lepidepecreoides chincui n.sp. Holotype, female, 5.8 mm, SMNH 5250, Bahía Chincuí, Chile.

Figure 5. Lepidepecreoides chincui n.sp. Holotype, female, 5.8 mm, SMNH 5250, Bahía Chincuí, Chile. Scales represent 0.1 mm.

Figure 6. Lepidepecreoides chincui n.sp. Holotype, female, 5.8 mm, SMNH 5250, Bahía Chincuí, Chile. Scales for U1–3 represent 0.1 mm, remainder represent 0.5 mm.