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Hokkaido, Japan

Ito T.,Hokkaido Aquatic Biology | Wisseman R.W.,Aquatic Biology Associates Inc. | Morse J.C.,Clemson University | Colbo M.H.,Acadia University | Weaver III J.S.,U.S. Department of Agriculture
Zootaxa | Year: 2014

The genus Palaeagapetus Ulmer (Trichoptera, Hydroptilidae, Ptilocolepinae) is revised in North America. Descriptions of the western species, P. nearcticus Banks 1938, are provided with the first descriptions of the female, pupa, larva, egg and case and with notes on food, habitat and annual life cycle. The male and female of the eastern species, P. celsus Ross 1936, are described or redescribed with some ecological notes. Distributions of the two species are summarized. Copyright © 2014 Magnolia Press.

A new species of hydroptilid caddisfly, Palaeagapetus fukuiensis sp. nov., is described based on adult and immature stages from Japan. The habitat and food of this species are noted. This species is more closely similar to the Russian Far Eastern species of Palaeagapetus than to the Japanese species. © The Japanese Society of Limnology 2009.

Ito T.,Hokkaido Aquatic Biology
Pan-Pacific Entomologist | Year: 2016

Protogyny is uncommon in caddisflies (Trichoptera) but does occur. I found protogyny in Lepidostoma satoi (Kobayashi, 1968) and L. complicatum (Kobayashi, 1968), while the congeneric L. itoae (Kumanski & Weaver, 1992) had a simultaneous emergence pattern of males and females. Dissection of the female internal reproductive organs revealed that the former two species had rather immature eggs, while the latter species had nearly mature eggs in the ovaries at emergence. Immature eggs needed 3 to 5 days to mature, but nearly mature eggs needed only 0 to 2 days. The mean longevity of females was 11.6 days in L. satoi, 10.4 days in L. complicatum, and 13.7 days in L. itoae. Male longevity in the former two species (4.6 days and 6.6 days, respectively) was less than the latter species (15.8 days). These results suggest that protogyny in L. satoi and L. complicatum is advantageous, allowing males to mate with mature females in a more timely manner, as the males can mate from the day of emergence. Protogyny at emergence may synchronize the mating period of the both sexes.

Ito T.,Hokkaido Aquatic Biology | Ohkawa A.,Hokkaido University | Hattori T.,Komagata dori
Zootaxa | Year: 2011

The Japanese species of Hydroptila Dalman (Trichoptera, Hydroptilidae) are reviewed, confirming 10 described species, and introducing 2 new species. For clear comparisons and to include new details, males and females of all species, including the 2 new species, H. ogasawaraensis Ito and H. nanseiensis Ito, are redescribed or described anew. Hydroptila itoi Kobayashi is synonymized with H. dampfi Ulmer and H. thuna Oláh and H. botosaneanui Kumanski are recorded for the Japanese fauna for the first time. Hydroptila usuguronis Matsumura is reassigned to the genus Psychomyia Latreille (Psychomyiidae). © 2011 Magnolia Press.

Ito T.,Hokkaido Aquatic Biology | Ohkawa A.,Hokkaido University
Zootaxa | Year: 2012

The tropical-subtropical caddisfly genus Ugandatrichia Mosely (Hydroptilidae) is recorded from Japan for the first time, with 2 species. Ugandatrichia nakijinensis Ito sp. nov. is described from Okinawa-jima and Amami-oshima, in the south of Japan, based on adults and immature stages. Ugandatrichia taiwanensis Hsu and Chen, originally described from Taiwan, is recorded and redescribed based on material from Iriomote-jima and Ishigaki-jima, in the southernmost part of Japan. Larvae of both live on smooth rock surfaces in very fast flowing waters. Copyright © 2012 · Magnolia Press.

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