Biological Study of the Japanese House Bat, <I>Pipistrellus abramus</I> (TEMMINCK, 1840) in Kagawa Prefecture

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  • 香川県産アブラコウモリの生物学的研究
  • カガワ ケンサン アブラコウモリ ノ セイブツガクテキ ケンキュウ 1 タイジ
  • Part 1. External, cranial and dental characters of embryos and litters.
  • 1.胎児および新産児における外部形態頭蓋骨の大きさと歯の特徴について

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Five pregnant females of Pipistrellus abramus (TEMMINCK) were collected at Zentsuji City in Kagawa Pref., June 9, 1973.<BR>The parturition and external, cranial and dental characters of embryos and litters were studied. The results can be summarised as follows:<BR>1. The period of parturition was June, 9-13.<BR>2. The embryo-size varies from 2 to 4 with an average 3.0.<BR>3. There was a considerable difference in absolute size of the external characters between embryos and litters. But, their proportions to the size of adults were nearly same between them.<BR>4. The skull in embryos and litters was in a stage more advanced than that of the external characters.<BR>5. The sutura of occipitals in embryos or litters attains to perfection more rapidly than that of frontals.<BR>6. The order of eruption in milk teeth was as follows; first: there are two upper and two lower incisors and one canine in each side of the jaw; second: one premolar erupts both on upper and lower jaw; third: one incisor on lower jaw; fourth: one premolar on lower jaw; and fifth: one premolar on upper jaw.<BR>7. The each crown of dig, di3, dc, dpml, DI1 and DI2 was divided into three lobes. That of DC was L-shaped and that of dpm2, DPM1 and DPM2 was wedge-shaped. The crown of dil with two lobes was observed.

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