Ichnopus Costa 1853

Lowry, J. K. & Kilgallen, N. M., 2014, A generic review of the lysianassoid family Uristidae and descriptions of new taxa from Australian waters (Crustacea, Amphipoda, Uristidae), Zootaxa 3867 (1), pp. 1-92 : 31

Ichnopus Costa 1853

( Fig. 18 )

Ichnopus Costa 1853: 169 .— Costa, 1857: 188.— Boeck, 1871: 98.— Sars, 1890: 39.— Della Valle, 1893: 800 (in part).— Stebbing, 1906: 52.— Chevreux & Fage, 1925: 46.— Stephensen, 1929: 60.— Pirlot, 1936: 269.— Gurjanova, 1951: 219.—J.L. Barnard, 1969: 346.— Lincoln, 1979: 94.— Ledoyer, 1986: 760.— Diviacco & Ruffo, 1989. 486— Barnard & Karaman, 1991: 491.— Lowry & Stoddart, 1992: 191 (key).— Lowry & Stoddart, 2003: 282 (catalogue).

Glycera Haswell, 1879: 256 (homonym Polychaeta ) (type species, Glycera tenuicornis Haswell, 1879 , monotypy.

Glycerina Haswell, 1882: 256 (new name for Glycera Haswell, 1879 ).— Stebbing, 1906: 60.— Pirlot, 1936: 270.—J.L. Barnard, 1969: 345.— Barnard & Karaman, 1991: 488.

Type species. Ichnopus taurus Costa, 1853 , monotypy .

Included species. Ichnopus includes 18 species: I. annasona Lowry & Stoddart, 1992 ; I. capricornis Lowry & Stoddart, 1992 ; I. caritus Lowry & Stoddart, 1992 ; I. comorensis Lowry & Stoddart, 1992 ; I. cribensis Lowry & Stoddart, 1992 ; I. macrobetomma Stebbing, 1917 ; I. malpatun Lowry & Stoddart, 1992 ; I. parriwi Lowry & Stoddart, 1992 ; I. pelagicus Schellenberg, 1926a ; I. pseudoserricrus Ledoyer, 1986 ; I. serricrus Walker, 1909 ; I. spinicornis Boeck, 1861 ; I. taurus Costa, 1853 ; I. tenuicornis ( Haswell, 1879 a) ; I. teretis ( Andres, 1981) ; I. walkeri G. Vinogradov, 2004 ; I. wardi Lowry & Stoddart, 1992 ; I. woodmasoni ( Giles, 1890) .

Diagnostic description. Antenna 1 peduncle article 1 without anterodistal lobe; accessory flagellum not forming cap covering callynophore. Antenna 2 with brush setae. Mandible molar setose with variously reduced triturating surface. Maxilla 1 outer plate a well developed 7/4 crown. Maxilla 2 inner plate slightly shorter than outer plate. Gnathopod 1 simple; coxa 1 large, subrectangular with concave anterior margin; ischium long (length 2 × to 4 × breadth); carpus long (length 2 to 4 × breadth) to very long; propodus margins subparallel; dactylus with complex spination on posterior margin. Uropod 2 inner ramus constricted. Telson moderately to deeply cleft.

Remarks. Based on the simple first gnathopods, with a long ischium and long to very long carpus and a dactylus with complex spination, Ichnopus is most similar to Eclecticus and Nagada . Ichnopus differs from both genera in having a deep to moderately cleft telson.

Distribution. Temperate/tropical cosmopolitan.

Figures

FIGURE 18. Ichnopus taurus Costa, 1853, female, 15 mm, AM P35698; male, 12 mm, AM P35699; from the Gulf of Naples, Mediterranean Sea. Scales bars: A1, female A2, gnathopods, 0.5 mm; remainder, 0.2 mm.