Bioacoustics of Stenothoe frecanda

6. Gn 2 propodus male with one acute distal tooth followed by deep incision and 1–2 blunt elevations near dactylus insertion; in female blunt elevation in the middle of palm; Cx 3 rectangular .......................... S. kaia Myers, 1985 ( 4.2 mm ) - Gn 2 propodus male without acute tooth; Cx 3 trapez-shaped, distad widening ... 7 7. Gn 2 in male propodus hind margin with many small ‘warts’ (sometimes also found on peduncle A 2) ................. S. verrucosa Krapp-Schickel, 2009c ( 3.5 mm ) - Gn 2 propodus in male on distal end of smooth and straight hind margin with one triangular elevation near dactylus insertion. S. frecanda Barnard, 1962 ( 3.6 mm ) Key to Stenothoe from Australia and New Zealand 1. Telson naked; Gn 2 male palm with two deep excavations .................................. ................................................. S. hansgeorgi Krapp-Schickel, 2006b ( 3.5–4 mm ) - Telson with spines and setae; Gn 2 never deeply excavated .............................. 2 2. U 3 ramus art 1 with three groups of spines along the margin ............................ ........................................................................ S. quabara Barnard, 1974 ( 3 mm ) - U 3 ramus art 1 only distal spines ..................................................................... 3 3. Gn 1 length of merus, carpus and propodus subequal. Gn 2 palm in both sexes coarsly serrated. Trapez-shaped Cx 3 on distal margin stiffened by ‘stridulation ridges’. P 7 basis posteriorly broadened and much lengthened, merus distally reaching proximal end of propodus ........... S. penelopae Krapp-Schickel, 2006b ( 2–3 mm ) - Gn 1 propodus always longer than carpus and merus. Gn 2 palm with or without distal tooth, but never regularly serrated. P 7 basis neither much broadened nor much lengthened, merus never reaching propodus ............................................ 4 4. Gn 2 palm distally with one (more or less) prominent tooth..........................5 - Gn 2 palm smooth ............................................................................................. 6 5. Gn 2 propodus also in adults with few short setae and small triangular hump distally ................................................. S. aucklandica Stephensen, 1927 ( 2.5 mm ) - Gn 2 propodus of adults with long setae, distal tooth followed by V-shaped incision ........................................................... S. miersi ( Haswell , 1879) ( 3.5 mm ) 6. P 3–4 carpus disto–posterior margin and P 5–7 carpus disto-anterior margin with stridulating humps; merus poorly produced ....... S. moe Barnard, 1972a ( 3 mm ) - P 3–7 carpus smooth ......................................................................................... 7 7. U 2 rami subequal; A 1 <A 2; T ratio l: w = 9: 4. S. allinga Barnard, 1974 ( 4 mm ) - U 2 rami clearly unequal; A 1 subequal A 2; T ratio l: w = 9: 5 ........................ .......................................................................... S. nonedia Barnard , 1974 ( 3 mm ) Key to Stenothoe species from the Indian Ocean 1. Telson naked. P 3–7 naked. U 3 naked, ramus art 2 straight and smooth .......... .......................................................................... S. inermis Ledoyer, 1979 ( 3 mm ) - Telson, peraeopods and U 3 with spines ........................................................... 2 2. U 3 ramus art 2 slender, along the distal ¾ of inner margin fine transverse sculptures ...................................................... S. gallensis Walker, 1904 ( 5–6 mm ) - U 3 ramus art 2 in male medially thickened, with thick sculptures .................. 3 3. U 3 ramus art 2 in male medially widened, distad gently narrowing; U 1 without peduncular spur. Gn 2 in both sexes propodus narrow, palm somewhat convave .............................................................................. S. andamanensis n. sp. ( 2 mm ) - U 3 ramus art 2 in male medially abruptly narrowing, second half of article with only 1/3 of width of the first one. U 1 with peduncular spur. Gn 2 female propodus regularly rounded ................................... S. himyara n. sp. ( 1.5–2 mm ) Key to Stenothoe species from the Subantarctis 1. Gn 2 propodus posterior margin in both sexes beset with long dense setae, at about anterior third (female) or anterior quarter (male) an acute and clearly prominent long tooth .......................... S. sivertseni Stephensen, 1949 ( 2.5–3 mm ) - Gn 2 propodus sculptured, but without prominent tooth .................................. 2 2. Gn 2 palm in both sexes with defined palmar corner, remaining hind margin of propodus about same length as palm. U 3 peduncle length subequal to ramus, on peduncle one distal and one medial group of spines. Eyes normal, rounded ....... ............................................................. S. magellanica Rauschert, 1998 ( 2.2 mm ) - Gn 2 palm without palmar corner, dactylus subequal in length to total propodus hind margin. U 3 peduncle unusually lengthened and thickened, along the margin beset with about 7 spines. Eyes very large ................. S. adhaerens Stebbing, 1888 ( 4 mm ) Among the material from Senegal , I found still another species, formerly placed within the genus Stenothoe :