著者

村上,好央

出版者

東京動物學會

雑誌

動物学雑誌

巻号頁・発行日

vol.75, no.2, 1966-02-15

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1. Dimorphodesmus, gen. nov. Related to Eucondylodesmus and Kylindogaster but is distinguished from these genera by the number of body segments, the shape of tubercles on the metatergites, and in having a modification on the anal segment of the abult male. In number of body segments it is near Doratodesmus (Jeekel, 1955) but differs in that the metatergites are without mid-dorsal processes. Body composed of 19 segments in the male and 20 in the female. The segments with low and rounded tubercles, which are arranged in 2 series on each of most metatergites. In the adult male the posterior margin of the anal seegment is modified in a peak-shape. The structure of male gonopods are clear. Telopodit distad of prefemur is broadened and lamellate, the femur with a process on the distal side, and tibiotarsus with some acute processes. Type species: Dimorphodesmus peculiaris, sp. nov. Dimorphodesmus peculiaris sp. nov. General color pale brown, the antennae whitish. Length about 4 mm in male, 5 mm in female. Head and antennae are very similar to those of Eucondylodesmus. Collum is subtrapezoid, narrower than the next segment, the upper irregularly granulate, and lateral angle areas conspicuously tuberculate. The second tergite is flattend and narrow at the middle dorsum, with three series of tubercles laterally. The keels are greatly enlarged and with 4 large, unequal scutellated tubercles. Third and fourth deels are simple and anterior margin serrulated. The succeeding keels are moderately enlarged, but the penult keels are conspicuously reduced in adult male. All keels with a incision on each of the posterior margin, and lateral ends of typical keels indistinctly 2-1obed. Repugunatorial pores open on the central tubercles of the keels of segments 5, 7, 10, 12, 13 and 15-18 (19 in female). Anal tergite of female is triangular and with tubercles. In adult male it is steep dome-shaped, smooth and with a post-marginal L-shaped peak in. The peak is as illustrated in figures 1 and 2. Gonopods as figured (Fig. 1, I-K). The femoral process shows some minute individual variations in length and shape, and seminal groove runs in the base of the process. Holotype: 1♂ (4.2 mm in Length); Allotype: 1♀ (5.0 mm in Length); Other specimens 7 ♂, 12♀. All the types collected by the author. Type locality: Oshima, Niihama, Ehime Pref. Through May 1964. Other record: Kinsha, Iyo-Mishima, Ehime Pref. May 17, 1963. Types are preserved in the author's collection. 2. Archandrodesmus kumamotensis, sp. nov. This species is distinguished from the related A. japanicus by the details of the male gonopods. Colour in life cinnabar-red. Length about 5 mm in male, 5.5 mm in female. Somatic characters are as described for A. japonicus, but without nodules of tarsal setae on the last two pairs of legs. Male gonopod is small, granulated, with two prefemoral branches, a leaf-shaped tibiotarsus and a ligulate branch. Figure 3 shows a different view of the left gonopod. Holotype: 1♀ (5 mm in Length); Allotype 1♀ (about 5.5 mm in Length). 7 other specimens. All types are collected by the author. Type locality: The remins of Kumamoto Castle, Kumamoto Pref., Aug. 10, 1964. Types are preserved in the author's collection.