Female with small orifice of cement gland located on median line of anterior sole region (Fig.
Cement gland in pedal sole described above (head-foot) (Figs 22, 23: eg).
This adhesive is produced in cement gland cells and conducted through a canal system to the area of attachment.
For statistical analysis, the structured-walk technique known as the Richardson plot (Mandelbrot, 1967) was used to compare the ruggedness of the nuclear membrane of the young (n = 10) and the mature (n = 10) cement gland cells.
We made gross morphologic measurements of body length (rostral tip of the cement gland to the tip of the tail), interocular distance (between the medial edges of the eyes), and body shape (presence of abnormal dorsal curvature).
Abnormalities that included malformed cement glands (chicken beaks) pronounced dorsal flexure, poorly developed somites, swollen guts, or sloughing of epidermal cells (Figure 2) were evident in embryos exposed to 5 lam concentrations of estrogenic compounds ([E.
development, ovary maturation and reproductive cycles in the American lobster Homarus americanus.
This fine branch splits again before reaching the duct, and minor branches project toward both the cement gland
and the muscular sac.
Proboscis receptacle is double walled; lemnisci slightly unequal testes in the anterior trunk; four tubular cement glands
; Saefftigen's pouch and cement glands
elongated; bursa is well developed and muscular.
Thereupon, cement glands
in the antennae secrete a strong adhesive that securely anchors the creature's head to the substrate.
By extracting the contents of cement glands
from thousands of marine worms, scientists have identified a component of silk and two unusual proteins used for making the worms' tubes.
These sequences, which represent the first three proteins identified in the American species, were chosen because they are among the most abundantly expressed in the cement glands
(Wang and Stewart, 2012), and because they are each representative of one category of adhesive proteins (i.