PROC. BIOL. SOC. WASH. 96(4), 1983, pp. 675-683 TWO SPECIES OF TYLOS AUDOUIN FROM CHILE, WITH NOTES ON SPECIES OF TYLOS WITH THREE FLAGELLAR ARTICLES (ISOPODA: ONISCOIDEA: TYLIDAE) George A. Schultz Abstract.— Two species of Tylos Audouin are described from Chile including a new species, T. chilensis, based on specimens formerly called T. spinulosus Dana. New specimens which more nearly match the description of T. spinulosus are redescribed under that name. The two species, both with three flagellar articles on the flagellum of antenna 2, are compared with each other and with the three other species of Tylos which also have three flagellar articles. Roman (1977:1 10) listed 24 species of Tylos Audouin (1826) (see Ferrara and Taiti, 1979:91, for explanation of use of Tylos Audouin, 1826), three of which have three flagellar articles on antenna 2. To Roman's list can be added T. marcuzzii Soika, and T. wegeneri Vandel (see Schultz 1974) making a total of at least 26 species in the genus (possible synonyms among them are not considered here). Tylos wegeneri has three flagellar articles and T. marcuzzii has four. The new species described herein and T. wegeneri bring to five the total number of known species of Tylos with three flagellar articles on the flagellum of antenna 2. With length and location they are: T. spinulosus Dana (1853), to 27 mm, central and southern Chile; T. neozelanicus Chilton (1901), to 14 mm, New Zealand; T. exiguus Stebbing (1910), to 4.5 mm. Red Sea; T. wegeneri Vandel (1952), to 22 mm. West Indies and west coast of Costa Rica; and T. chilensis, new species, to 12 mm, central Chile. Only slight morphological differences separate most species of Tylos (except T. wegeneri which has a unique pleotelson) and the species with three flagellar articles on antenna 2 (except T. wegeneri) are no exceptions. The new species described here is based on the specimens called T. spinulosus (Dana) by Schultz (1970). Specimens of a diflferent species (also with three flagellar articles) kindly sent to me by Dr. Eduardo Jaramillo, Universidad Austral de Chile, proved to be more nearly like T. spinulosus Dana than the specimens described by Schultz under that name, and they are described here as T. spinulosus. I thank Dr. Eduardo Jaramillo for sending me the specimens so that accurate identifications could be made of the two species of Tylos from Chile. I also thank Jersey City State Coflege for separately Budgeted Research funds. Tylos spinulosus Dana, 1853 Figs. lA-J, 2A-F, 3A-E Tylus spinulosus Dana, 1853:717, pi. 47, fig. la-c. Tylos spinulosus Y:>3.ndi.-M\Qrs 1877:675. -Budde-Lund 1879:9; 1885:279; 1908: 78.-Stebbing 1893:424.-Chilton 1901:121; 19 10:288.-Van Name 1924:192; 1936:415, 416, fig. 257. nee Tylos spinulosus {D2in2C).—^c\m\\z 1970:302, figs. 18-27.
BioStor
