We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Microscopic anatomy and fine structure of the skeleton-heart-kidney complex in Saccoglossus mereschkowskii (Hemichordata, Enteropneusta): 1. Stalk skeleton.
- Authors
Ezhova, O.; Malakhov, V.
- Abstract
This is the first paper of the series devoted to the microscopic anatomy and fine structure of the skeleton-heart-kidney complex in the acorn worm Saccoglossus mereschkowskii Wagner 1885. The skeleton of S. mereschkowskii consists of the unpaired anterior plate (lamina imparis) and two posterior horns (corni). The anterior plate bears a pair of lateral wings (alae laterales), the midventral keel (carina ventralis), the central fossa (fossa centralis) with the bordering ridge (crista circumflexa fossae centralis), two symmetrical supporting saucers (subiculi), and the conical rostrum (rostrum). The skeleton is an accretion (overgrowth) of the basal lamina between the epidermis and the endodermal epithelium of the buccal diverticulum (in the anterior part) and between the endodermal epithelia of the buccal diverticulum and the gut (in the posterior part) and consists of collagen fibers, mostly longitudinal. In all representatives of the Enteropneusta studied to date, the skeleton is a wishbone-like structure with the unpaired anterior plate and paired posterior horns, but its components widely vary in shape between species. In the family Harrimaniidae, the horns are long, and the anterior plate is rod-shaped. In the Ptychoderidae, the horns are short, and the anterior plate is rectangular. In the Spengelidae, the skeleton has an intermediate shape.
- Subjects
ENTEROPNEUSTA; HEMICHORDATA; MARINE invertebrate anatomy; HISTOLOGY; MOLECULAR biology; SKELETON; TRANSMISSION electron microscopy; SCANNING electron microscopy
- Publication
Biology Bulletin, 2010, Vol 37, Issue 8, p795
- ISSN
1062-3590
- Publication type
Article
- DOI
10.1134/S1062359010080042