Jpn. J. Limnol., 54, 2, 141-150, 1993 Review Checklists of Trichoptera in Japan 1. Hydroptilidae and Lepidostomatidae Tomiko ITO, Kazumi TANIDA and Takao NOZAKI Abstract This is the first in a series of checklists which will review taxonomical, biogeogra- phical and ecological publications on Japanese Trichoptera. This part deals with 10 species belonging to 4 genera of Hydroptilidae and 31 species belonging to 5 genera of Lepidostomatidae. In Hydroptilidae we suggest four taxonomical problems: 1) Hydroptila itoi KOBAYASHIand Stactobia japonica IWATAshould be compared with similar species from the adjacent country; 2) descriptions of Hydroptila usuguronis MATSUMURAand Oxyethi- ra angustella MARTYNOVare insufficient for species identification; 3) many descriptions of larvae and cases are also insufficient for species identification; 4) four undescribed species are in the collections of the authors. The Japanese Lepidostomatidae have been intensively studied in recent years . However, two taxonomical problems remain: 1) generic status of four species, Dinarth- rodes albardanus (ULMER), D. albicorne (BANKS), D. elongatus MARTYNOVand D. kasugaensis TANI, has not been clarified; 2) nine undescribed species have been co- llected. Key words: Trichoptera, checklists, fauna, Japan Hydroptilidae and Lepidostomatidae. 1. Introduction Many researchers have studied the Tri- 2. Bibliography choptera fauna of Japan and adjacent regions. In this checklist, genera and species are Among the studies, only some revisional ones arranged alphabetically within each family or on adults (TSUDA, 1942b; TANI, 1977) and on subfamily. The recorded districts and the larvae (TSUDA, 1959; TSUDA and AKAGI, 1962; Japanese names of each species are shown in TANIDA, 1985) have been conducted. TANIDA brackets. Where no existing Japanese names (1987) provided a tentative list of Trichoptera are designated, we provide new names, which genera, based on an examination of all refe- we have marked with asterisks. The publica- rences to their taxonomy and fauna. How- tions listed are basically concerned with taxo- ever, knowledge of Japanese Trichoptera nomy, but some publications of biogeographical remains unsatisfactory and disorganized due to and biological importance are also included. the lack of both revisional studies of families and reliable checklists. We will present provi- 3. Family Hydroptilidae STEPHENS sional but up-to-date lists of Japanese Tri- 3-1. Subfamily Hydroptilinae STEPHENS choptera for future studies. The first of those Seven species of Hydroptilinae have been lists is presented here, and it deals with the described from Japan since the work on larvae 142 1TO, TANIDA and NOZAKI by IWATA (1927). However, the specific and were described but these characters are insuffi- sometimes generic identifications were insuffi- cient for species identification. The holotype cient, probably because reliable textbooks have is deposited in the collection of the Entomologi- not been available until recently. Four taxo- cal Institute of Hokkaido University, Sapporo. nomic problems still regarding Japanese Hydroptila sp. OA [Honshu (Hyogo)] Hydroptilinae: (1) Hydroptila itoi KOBAYASHI TANIDA,1985, 189. and Stactobia japonica IWATAhave not been Orthotrichia sp. OA: TETSUKAWA,1965, 42-44, compared with similar species on adjacent dis- larva, case; transferred by TANIDA,1985. tricts; (2) descriptions of both Hydroptila Hydroptila sp. [Honshu (Gifu)] usuguronis MATSUMURAand Oxyethira angustella Orthotrichia tetensii KOLBE:IWATA, 1927, 206, MARTYNOV,described only females, which is larva, case. (Misidentification). insufficient for species identification; (3) the The description of larva and case by IwATA larvae and cases of two `species' with only (1927) clearly shows that the larva belongs to tentative alphabetic designations of Hydroptila the genus Hydroptila, but the species identifica- and Oxyethira (TETSUKAWA,1962, 1965) and tion is impossible from the description.O three unnamed `species' of Hydroptila, Orthotri- . tetensii (presently named O. costalis) is the chia and Stactobia (IWATA,1927; TANIDA,1985) European species (ILLIES,1967). As with the are not identifiable as species, since larvae and other species described in IWATA(1927, 1930), cases are presently indistinguishable within this one also was wrongly assinged to a Euro- each genus of this subfamily; (4) four unde- pean species based only on larval characters. scribed species are in the collections of the Orthotrichia sp. authors. TANIDA,1985, 188-189, larva, case. Hydroptila itol KOBAYASHI,1977 [Hokkaido Oxyethira acuta KOBAYASHI,1977 [Hokkaido (Iburi); Numa-himetobikera] (Iburi); Hagoita-himetobikera] KOBAYASHI,1977, 5-6, male, female; ITO and KOBAYASHI,1977, 6-7, male, female; ITo and KAWAMURA(KAWAMULA), 1980, 113-118, pupa, KAWAMULA,1984, 313-314, pupa, larva, case, larva, case, habitat, life cycle; ITo and habitat, life cycle. KAWAMULA,1984, 315. Oxyethira angustella MARTYNOV,1933 [Hon- Oxyethira ezoensis KOBAYASHI,1977, 5-6, male; shu (Nagano); Hoso-himetobikera*] synonymized by ITo and KAWAMULA,1984. MARTYNOV,1933, 139-140, female. This species had previously been recorded Venation of hind wing and general features of only from Hokkaido, but a male has recently forewing, antenna, palpi, head and thorax of been collected from Honshu (TANIDA,unpu- female were described but the characters are blished). The specific status of this species insufficient for species identification. should be confirmed by comparing with conti- Oxyethira sp. OA [Honshu (Hyogo)] nental species. TETSUKAWA,1962, 45-46, larva, case. Hydroptila matsuli KOBAYASHI,1974 [Honshu Stactobia japonica IWATA, 1930 [Honshu (Nagano), Kyushu (Fukuoka); Matsui - (Gifu, Nagano, Nara) ; Kaku-himetobikera] himetobikera] IWATA,1930, 59, larva, case; TETSUKAWA,1965, KOBAYASHI,1974, 67-68, male. 39-42, larva, case; BOTOSANEANU,1990, 47-48. Hydroptila oguranis KOBAYASHI,1974 [Hon- Stactobia Sp. [Honshu (Kyoto)] shu (Kanagawa); Ogura-himetobikera*] TANIDA, 1985, 188-189, larva and case; KOBAYASHI,1974, 68-69, male. BOTOSANEANU,1990, 47-48. Hydroptila usuguronis MATSUMURA,1931 [Ho- Only the larvae of the genus Stactobia has kkaido (Ishikari) Honshu (locality unknown); been recorded in Japan. Since S. makartschen- Usuguro-himetobikera] koi BOTOSANEANUand LEVANIDOVA,1988 was MATSUMURA,1931, 1136-1137, female. recently described from Kunashir Island, these Colour, size and wing venation in females Oriental species should be compared with each 143 Checklists of Trichoptera in Japan 1 other in both adult and larval stages. (1) Generic assignment of four species, 3-2. Subfamily Ptilocolepinae MARTYNOV Dinarthrodes albardanus (ULMER),D. albicorne In the Ptilocolepinae, three species of (BANKS), D. elongatus MARTYNOVand D. Palaeagapetus were recently described (ITO and kasugaensis TANI,is not yet clarified. HATTORI,1986; ITO, 1991a, 1991b). This primi- The generic classification of this family is tive genus is represented by seven species, in- fairly confused, particularly in Asia, mainly for cluding one fossil species from Baltic amber, two reasons. (a) Male secondary sexual three extant from Japan, one from Russia characters have been proposed as the basis of (Primorye) and two from North America genera by early authors (e. g., MOSELY,1939- (MARSHALL,1979; Ito, 1991b). Palaeagapetus is 1949; ULMER,1951; TANI, 1971). However, these more diverse in the Far East, particularly in characters have little correlation to male geni- Japan, than anywhere else in the world. tal, female and larval characters, as shown in Palaeagapetus flexus ITO, 1991 [Hokkaido the North American and Japanese Lepido- (Nemuro, Tokachi, Sorachi, Hidaka, Ishikari, stomatids (Ross, 1944; ITO, 1984b). (b) Iburi), Russia (Sakhalin); Magari-kamenoko- Although the importance of larval characters in himetobikera] establishing true affinities has been emphasized ITO,1991b, 431-438, male, female, pupa, larva, by MOSELY(1939), Ross (1946), WIGGINS(1977) egg, case, habitat, life cycle; VSHIVKOVA,in and ITO (1984b), assignment to genera has been press. recognized without any consideration of larval Palaeagapetus ovatus ITO and HATTORI,1986 characters even in recent time (WEAVER,1985; [Hokkaido (Ishikari, Iburi, Oshima), Honshu KUMANSKIand WEAVER,1992). Furthermore, (Akita, Tochigi); Kamenoko-himetobikera] several species have been assingned to different ITO and HATTORI,1986, 143-149, male, female, genera, despite the fact that their larvae so pupa, larva, egg, case; Ito, 1988, 150-154, life closely resemble each other as to be undistingui- cycle. shable in the present state of the taxonomy: i.e., Palaeagapetus parvus ITO, 1991 [Honshu Dinarthrodes albardanus (ULMER)and Goerodes (Hyogo, Ishikawa) ; Kogata-kamenoko- japonicus (TsuDA); Dinarthrodes elongatus himetobikera] MARTYNOV,Goerodes hiurai (TANI), Goerodes ITO,1991a, 359-365, male, female, pupa, larva, kanbaranus (KOBAYASHI)and Goerodes orientalis egg, case, habitat. (TSUDA) (KUMANSKIand WEAVER, 1992). 3-3. Genera of other families originally Although the possibility of parallelism in larval assigned to Hydroptilidae. morphology can not be completely ruled out, we Tsukushitrichia KOBAYASHI,1964a. Transferr- believe these species should be assigned to a ed to Psychomyiidae and synonymized with single genus in the future, since different genera Melanotrichia (BARNARDand DUDGEON,1984). of all other families of Trichoptera show some Uenotrichia TSUDA, 1942a. Recorded from distinct discriminative characters at the larval Korea, transferred