✦ LIBER ✦

New developments in vertebrate cytotaxonomy VI. Cytotaxonomy and evolution of lower chordates

✍ Scribed by D. Colombera

Publisher: Springer Netherlands
Year: 1982
Tongue: English
Weight: 292 KB
Volume: 58
Category: Article
ISSN: 0016-6707
DOI: 10.1007/bf00056776

No coin nor oath required. For personal study only.

✦ Synopsis

A correlation between evolutionary trends and karyotype has been recognized in tunicates. In the ambit of lower chordates and related species, Hemichordata, Cephalochordata and, in the Tunicata, some ascidians seem to maintain a primitive organization of chromosomes: haploid numbers around 20, absence of sex chromosomes, and rod-shaped bivalents. Within the class Ascidiacea, at the karyological level Ctavelina lepadiformis seems to be very specialized and the family Perophoridae (suborder Phlebobranchiata) very primitive. Thaliacea and Larvacea appear specialized in comparison with the primitive ascidians.

📜 SIMILAR VOLUMES

New developments in vertebrate cytotaxon

New developments in vertebrate cytotaxonomy V. Cytotaxonomy of lampreys

✍ I. C. Potter; E. S. Robinson 📂 Article 📅 1981 🏛 Springer Netherlands 🌐 English ⚖ 155 KB

Few papers on the chromosomes of cyclostomes have been published since our last review (Potter & Robinson, 1973), and subsequent work has concentrated on those of the lampreys (Petromyzoniformes) rather than the hagfishes (Myxiniformes). This brief account provides a summary of recent information an

New developments in vertebrate cytotaxon

New developments in vertebrate cytotaxonomy VIII. A current list of references on avian karyology

✍ L. E. M. Boer 📂 Article 📅 1984 🏛 Springer Netherlands 🌐 English ⚖ 300 KB