Ovaries of Tubificinae (Clitellata, Naididae) resemble ovary cords found in Hirudinea (Clitellata) [0.03%]
环节动物 clitellata 门 naididae 科 tubificinae 属的卵巢与 hirudinea 亚纲的卵巢索相似
Anna Z Urbisz,Mariola Krodkiewska,Piotr Swiątek
Anna Z Urbisz
The ultrastructure of the ovaries and oogenesis was studied in three species of three genera of Tubificinae. The paired ovaries are small, conically shaped structures, connected to the intersegmental septum between segments X and XI by thei...
Carlos A Díaz-Balzac,Wigberto Mejías,Luis B Jiménez et al.
Carlos A Díaz-Balzac et al.
Catecholamines have been extensively reported to be present in most animal groups, including members of Echinodermata. In this study, we investigated the presence and distribution of catecholaminergic nerves in two members of the Holothuroi...
Neuroanatomy of the tube feet and tentacles in Holothuria glaberrima (Holothuroidea, Echinodermata) [0.03%]
光滑光萼星的步带足和腕神经解剖学（海参纲，棘皮动物门）
Carlos A Díaz-Balzac,José E Abreu-Arbelo,José E García-Arrarás
Carlos A Díaz-Balzac
Echinoderms are a key group in understanding the evolution of the nervous system in the Metazoa. Remarkably, little is known about echinoderm neurobiology. The echinoderm podia, which are unique echinoderm modifications and comprise structu...
Anatomical and gravitational influences on cardiac displacement in snakes (Lepidosauria, Serpentes) [0.03%]
解剖和重力对蛇心脏位移的影响(Lepidosauria，Serpentes)
B A Young,S L Street,R J Wassersug
B A Young
Radiographs of live, unanesthetized snakes were used to document the position of the heart in the body cavity during horizontal, head-up, and head-down postures. The extent of cardiac displacement observed during these postural changes diff...