계림갈퀴노래기(Anaulaciulus koreanus koreanus) 촉각 감각모의 미세구조
Microstructure of the Antennal Sensilla in the Millipede Anaulaciulus koreanus koreanus (Julida: julidae)
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노래기는 눈의 기능이 퇴화된 야행성 동물로서, 외부 환경으 로부터 오는 자극을 감지하는 발달된 촉각을 가진 대표적인 절 지동물이다. 계림갈퀴노래기 촉각의 미세구조를 주사전자현미경 을 이용하여 분석한 결과, 대형의 말단원추 감각기 (AP) 4개와 모상 감각모 (CS), 관상 감각모 (TS), 추상 감각모 (BS) 등 3종류 의 감각모가 구분되었다. 기계적 자극을 수용하는 모상 감각모와 관상 감각모는 말단 마디를 제외한 모든 마디에 고루 분포되어 있었고, 화학적 자극을 수용하는 추상 감각모는 제5마디부터 제7 마디까지의 원위 말단부에 형성된 큐티클 함몰부에서만 특이적 으로 관찰되었다. 추상 감각모는 미세구조적 특징에 따라 다시 3 종류가 구분되었는데, 길이가 긴 제1형 (BS1)은 제5마디에 분포 되어 있었고, 길이가 짧은 제2형 (BS2)은 제6마디에, 그리고 가시 모양의 제3형 (BS3)은 제7마디에만 분포되어 있음이 확인되었다. 특히, 노래기 종류에 따라 촉각에 분포된 추상 감각모의 개수와 분포 양상 등은 종간의 차이가 현저하여 분류학적 형질로 적용 할 수 있을 것으로 사료된다.
Abstract
The antennae of millipedes have a prominent function in detecting various types of environmental stimuli, and structural modification of the antennae is closely associated with the degree of sense recognition. Although the biological significance of the antennal sensillae to millipedes are widely understood, the structure and function of the antennal sensillae are still not clear and more precise analysis is required. We have analysed the ultrastructural characteristics of the antennal sensillae in a millipede Anaulaciulus koreanus koreanus using field emission scanning electron microscopy (FESEM). According to their morphological and substructural features, we could identify three different types of antennal sensillae as follows: trichoid sensilla (TS), chaetiform sensilla (CS) and basiconic sensilla (BS). The TS on the articles are long, blunt-tipped, almost straight hairs with deep longitudinal grooves in their lower parts whereas, the CS are long, sickleshaped bristles with longitudinal grooves acuminating toward the tip. The BS can be subdivided further into three subtypes which are the large-sized basiconic sensilla (BS1), the small-sized basiconic sensillae (BS2) and the spiniform basiconic sensillae (BS3). The BS between the terminal segment and distal margins of the other segments are clearly discriminated in this species.
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