パンカラマイマイConiglobus batanicus pancalus(SCHMACKER & BOTTGER)及びコウトウシヨマイマイC.b.boteltobagoensis KURODAの形態學的研究並にドングリマイマイ屬Coniglobusの分類學上の意義
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External features and anatomical structures of Coniglobus batanicus pancalus (SCHMACKER & BOTTGER) and C. batanicus boteltobagoensis KURODA, collected respectively from Kotosyo, Formosa, were compared, and their systematic position and the significance of the group were discussed. These two forms agree well both in most features of the shell and in the organization of the genitalia: 1. The shell is thick, sinistral, globose in shape, and its diameter is always larger than the height, the base is rather flattened, the umbilicus is narrowly perforated, the whorls 5-2/3 in number. C. b. boteltobagoensis is higher than C. b. pancalus. The ratios of the height to the diameter are shown in table 1 and 2. 2. The surface of the shell is smooth, shining and colored with greenish straw, banded with dark brown with the formula of 1 2 3 0. 3. The genital system is devoid of dart-sac and mucous glands (fig. 1 A). 4. The proximal part of the penis is strikingly thickened, where the appendix is not defined externally, but coalesces so intimately with the penis that the section merely shows a small lumen of the appendix beside that of the penis (fig. 1 B). 5. The epiphallus opens directly into the penis and not through the appendix as in the case of Ganesella. 6. The genitalia of C. b. pancalus is larger than that of C. b. boteltobagoensis. 7. The radular formulae of the two forms are as follows: In C. b. pancalus; C((1)+1+(1))/1・ L((1)+1+(1))/(18)・MI(1+1+(1))/(13)・ME((1+1+(1))/(23)・(2+1+2)/3) = 115 In C. b. boteltobagoensis; C((1)+1+(1))/1・L((1)+1+(1))/(17)・MI((1)+1+(1))/(19)・ME((1+1+(1))/8・(1+1+2)/6) = 101 8. The jaw of C. b. pancalus consists of 13 small plates, of which the marginal four are connected closely with, and the other five separated from, each other (fig. 2 A). T. KURODA and Iw. TAKI (1933) were of the opinion that Eulota mercatoria and Eulota yaeyamensis should belong to the genus Coniglobus, by reason of their characteristic sculpture of the embryonic shell and the organization of the genitalia. But regarding these features there is no difference between Ganesella and the two species of Eulota. The granular structure on the embryonic shell found in the type of Coniglobus is not peculiar to this group, this being also found in some members of Ganesella. It is, therefore, more reasonable to transfer the above two species of Eulota to the genus Ganesella. Since genitalia of the group Couiglobus differs from that of Ganesella as mentioned above, it seems to be natural to treat is as a genus and to place it near Ganesella in the family Pleurodontidae. The genus Coniglobus may be diagnosed as follows, basing principally on the anatomical structures: Shell thick, globose-conical shaped with rather flattened base; surface smooth, lustrous, generally banded; peristome thick, reflexed outside; umbilicus narrow; genitalia devoid of dart-sac and mucous glands, having a small flagellum; appendix not defined externally as being coalesced with penis; epiphallus continuous directly with penis; small plates of jaw free at the middle, connected together on both sides.
- 社団法人日本動物学会の論文
- 1937-01-15