Stenothoe species

Krapp-Schickel, T., 2013, New or amended data on Mediterranean Amphipoda: genera Dexamine, Ericthonius and Stenothoe, Zootaxa 3613 (2), pp. 125-145 : 142-143

Key to eight Mediterranean Stenothoe species with spinose telson

1. Gn 2 in both sexes propodus with semicircular excavation.......... S. dollfusi Chevreux, 1887 (3–4 mm, below 4 m depth)

- Gn2 not as above...................................................................................... 2

2. Gn1 carpus with free disto-posterior margin parallel to anterior one.............................................. 3

- Gn1 carpus triangular, without free posterior margin.......................................................... 4

3. A1, 2 short and robust. P7 merus not reaching distal end of carpus. Gn 2 male, female with convex serrated palm................................................................ S. antennulariae Della Valle, 1893 (1.5 mm, with hydroids)

- A1, 2 long, slender. P7 merus reaching distal end of carpus. Gn 2 male, female propodus palm linear or concave, serrated (fem.) or with strong humps (male)............................. S. bosphorana Sowinsky, 1898 (3–4mm, on muddy bottoms)

4. Gn 2 in both sexes propodus harmonically rounded, without excavation or protuberances............................................................................................... S. tergestina ( Nebeski, 1880) (3mm, in algae)

- Gn 2 male with serrations, excavations or dentation........................................................... 5

5. Gn2 palm regularly serrated without prominent elevation.................. S. marina ( Bate, 1856) (4mm, with hydroids) - Gn 2 male propodus palm straight and setose, distally with one or two teeth........................................ 6

6. U3 peduncle article 3 in male slightly curved and rugose, art 2 in adult with marginal and distal spines. Gn 2 female propodus hind margin regularly rounded................................... S. cattai Stebbing, 1906 (3–3.5 mm, upper littoral)

- U3 peduncle art 3 straight and smooth, Gn 2 female propodus hindmargin not regularly rounded.......................7

7. Gn1 length of merus subequal to the one of carpus; Gn 2 male dactylus and propodus beset with long, dense setae, propodus distally without incision; Gn 2 female with small triangular elevation on distal half of palm; U3 peduncle art 2 spines also marginally............................................. S. eduardi Krapp-Schickel, 1976 (4mm, in epiphytes on ships)

- Gn 1 male, female merus much longer than carpus; Gn 2 male dactylus and propodus with short setae; U3 peduncle art 2 spines only distally......................................... S. valida Dana, 1855 (5–6mm, typical for fouling, in harbours)