The functional-morphological adaptive strategy of digestive organs ofdecapodiform cephalopods

Journal of Veterinary Medical Science

Ayano OMURA¹  Hideki ENDO² 

[1] Graduate School of Agricultural and Life Sciences, The University Museum, The University of Tokyo, 7�?3�?1 Hongo, Bunkyo-ku, Tokyo 113�?0033, Japan;The University Museum, The University of Tokyo, 7�?3�?1 Hongo, Bunkyo-ku, Tokyo 113�?0033, Japan

关键词: cecum;    decapodiform;    digestive organ;    locomotion;    stomach;   

DOI  :  10.1292/jvms.15-0185

学科分类：兽医学

来源: Japanese Society of Veterinary Science

【 摘 要 】

References(21)The digestive organs in decapodiform cephalopod species morphologically vary byindividual lifestyle. We examined the following six species of adult decapodiformescephalopods representing different habitats: Todarodes pacificus, Loligobleekeri, Loligo edulis, Wataseniascintillans (pelagic), Sepia lycidas and Euprymnamorsei (benthic). L. bleekeri and L. edulispossess a bursiform cecal sac connected to the cecum. Pelagic species have a singledigestive gland smaller than in benthic species. T. pacificus has an ovaldigestive gland larger than that of L. bleekeri and L.edulis, which possess withered-looking and smaller digestive glands. Incontrast, the digestive glands in benthic species are paired. S. lycidasand E. morsei have well-developed and larger digestive glands than thoseof the pelagic species. Well-developed digestive duct appendages are found in benthicspecies. In qualification of the mass of digestive organs, pelagic species have smallerstomachs, digestive glands and digestive ducts�? appendages than benthic species. Becausepelagic species need to swim, they may possess smaller stomachs and larger cecums for morerapid digestion. A smaller digestive gland may have the advantage of reducing the bodyweight in pelagic species for rapid swimming. In contrast, since benthic species require alonger time for digestion than pelagic species, they compact more food in their stomachsand absorb nutrients via more organs, such as the digestive grand and digestive ductappendages, in addition to cecum.

【 授权许可】

Unknown