Leptanthura argentinae Kensley 1982

Leptanthura argentinae

MATERIAL.—Holotype: USNM 185021, Sta WHOI 245, 1 ovig. , 5.9 mm. Allotype: USNM 185022, Sta WHOI 245, 1 , 7.5 mm. Paratypes: USNM 185023, Sta WHOI 245, 2 ovig. , 5.4–5.5 mm, 4 , 6.0–7.5 mm, 70 non-ovig. and juvs; ZMC: Sta WHOI 245, 1 ovig. , 5.5 mm, 1 , 7.5 mm, 5 non-ovig. . Additional material: SIO: Sta WHOI 237, 2 ovig. , 8.0–8.8 mm, 4 , 7.9–8.8 mm, 8 non-ovig. and juvs; Sta WHOI 262, 1 ovig. 6.4 mm; Sta WHOI 259, 1 ovig. , 6.0 mm, 3 , 6.5–7.0 mm, 9 non-ovig. and juvs.

DESCRIPTION.—Ovigerous Female: Integument thin, delicate, non-indurate. Proportions: C < 1 = 2 = 3 < 4 = 5 > 6 > 7. Rostrum reaching as far as rounded dorsolateral lobes of cephalon. Pleonites 1–4 subequal in length; pleonites 5 and 6 subequal, longer than preceding segments. Telson parallel-sided, with broad hyaline margin, distal margin broadly and evenly rounded; large single proximal statocyst present.

Antennular peduncle with basal segment longer and broader than three distal segments together; flagellum of four articles. Antennal flagellum of three articles. Mandibular palp with second segment twice length of first; third segment with two terminal spines. Maxilliped with obsolete endite; palp with four setose articles beyond endite. Pereopod 1 propodus with triangular proximal “thumb,” palm very slightly concave, with nine multidentate sensory spines; carpus with two sensory spines. Pereopods 2–3 propodi not as large as in pereopod 1, palm straight, with seven multidentate sensory spines; carpi with two sensory spines. Pereopods 4–7 with unguis about one-sixth length of dactylus; propodus with four spines on posterior margin; carpus with two spines. Pleopod 1 exopod operculiform; endopod slightly shorter and less than half of exopod. Uropodal exopod broadly oval, with hyaline margin fringed with plumose setae; endopod triangular, distally narrowly rounded, setose, subequal in length to basis, about half its length beyond telsonic apex.

Male: Body more elongate than in female. Antennular flagellum of 10 to 12 articles bearing whorls of fine aesthetascs. Pleonites relatively more elongate than in female. Pleopod 2 with copulatory stylet slender, cylindrical, extending beyond endopodal apex. Uropodal endopod relatively more elongate and setose than in female; exopod relatively wider than female, with longer straight margin. Telson tapering to narrowly rounded apex.

Leptanthura argentinae là một loài chân đều trong họ Leptanthuridae. Loài này được Kensley miêu tả khoa học năm 1982.

1002-4392