再びナベカ Dasson elegans (STEINDACHNER) 及びイソギンポ Blennius yatabei JORDAN et SNYDER に就いて
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概要
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Concerning the external features of the female urogenital opening of Dasson elegans (Zool. Mag. Tokyo, '50, 59, 220) and Blennius yatabei (ibid., '50, 59, 222) following statements were made:-"there is a tiny pointed or round papilla on the dorsal side of the opening (D. elegans), situated between the paired soft swallings which extend to the proximal part of the anteriormost flexibe spine of the anal fin, " and "the features of the urogenital opening (B. yatabei) are very much like those of the female of D. elegans." After further observation, the papilla stated above was identified as the distal end of the 1st anal spine, the greater part of which is embedded in the soft swellings. Furthermore, the anteriormost flexible spine of the preceding report actually turned out to be the 2nd flexble spine. Consequently the ray designated as the 2nd anal spine (2. sp) in the figures of the female urogenital opening of the two species needs to be corrected as the 1st articulate anal ray. It will be added that the young females of these two species about 25 mm long to the caudal base have already acquired almost the same features of the opening as those of the adult. Such features are also seen in D. trossulus JORDAN et SNYDER) (ibid., '51, 60, 161), but not so distinct in the females shorter than 45 mm in length. In the mature male of D. elegans a distinct knob develops near the tip of each articulate anal ray during the spawning season (Fig. 1). In the case of B. yatabei, in stead of the knob, a keel develops at the corresponding site accompanied proximally by a pair of soft swellings on the both sides of each articulate ray (Fig. 2).
- 社団法人日本動物学会の論文
- 1952-01-15
著者
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