Biomaterial Database

[Embryonic development of Taenia pisiformis and T. hydatigena (Cestoidea, Cyclophyllidea)]. 1988

L N Romanenko, and S O Movsesian

A description of the consecutive stages of ripening of ovary cells of early fission and gastrulation of T. pisiformis and T. hydatigena, peculiar to the common type of fission of Cyclophyllidea is given. The fission has signs of double spiral fission which takes place in primitive Turbellaria. The primitiveness of early embryogenesis is reflected in early determination of macromeres, in the absence of strict regulation in the location of blastomeres, in the formation of blastula and unipolar gastrulation with the absence of morphological differentiation of ectoderm and mesenchyme.

UI	MeSH Term	Description	Entries
D001757	Blastomeres	Undifferentiated cells resulting from cleavage of a fertilized egg (ZYGOTE). Inside the intact ZONA PELLUCIDA, each cleavage yields two blastomeres of about half size of the parent cell. Up to the 8-cell stage, all of the blastomeres are totipotent. The 16-cell MORULA contains outer cells and inner cells.	Blastocytes,Blastocyte,Blastomere
D002970	Cleavage Stage, Ovum	The earliest developmental stage of a fertilized ovum (ZYGOTE) during which there are several mitotic divisions within the ZONA PELLUCIDA. Each cleavage or segmentation yields two BLASTOMERES of about half size of the parent cell. This cleavage stage generally covers the period up to 16-cell MORULA.	Segmentation Stage, Ovum,Cleavage Stages, Ovum,Ovum Cleavage Stage,Ovum Cleavage Stages,Ovum Segmentation Stage,Ovum Segmentation Stages,Segmentation Stages, Ovum
D004285	Dogs	The domestic dog, Canis familiaris, comprising about 400 breeds, of the carnivore family CANIDAE. They are worldwide in distribution and live in association with people. (Walker's Mammals of the World, 5th ed, p1065)	Canis familiaris,Dog
D005314	Embryonic and Fetal Development	Morphological and physiological development of EMBRYOS or FETUSES.	Embryo and Fetal Development,Prenatal Programming,Programming, Prenatal
D005775	Gastrula	The developmental stage that follows BLASTULA or BLASTOCYST. It is characterized by the morphogenetic cell movements including invagination, ingression, and involution. Gastrulation begins with the formation of the PRIMITIVE STREAK, and ends with the formation of three GERM LAYERS, the body plan of the mature organism.	Archenteron,Blastopore,Gastrocoele,Primitive Gut,Archenterons,Blastopores,Gastrocoeles,Gastrulas,Gut, Primitive,Guts, Primitive,Primitive Guts
D000818	Animals	Unicellular or multicellular, heterotrophic organisms, that have sensation and the power of voluntary movement. Under the older five kingdom paradigm, Animalia was one of the kingdoms. Under the modern three domain model, Animalia represents one of the many groups in the domain EUKARYOTA.	Animal,Metazoa,Animalia
D013621	Taenia	A genus of large tapeworms.	Taeniarhynchus,Taenias