The hypobranchial and the ceratobranchial form the lower limb of a branchial arch
and the epibranchial forms the upper limb (Sakamoto 1984).
Msx appears to be critical for the differentiation of first branchial arch
ectoderm-mesenchyme leading to various craniofacial structures (14).
The base is fixed to the branchial arch
by connective tissues and perforated by nutrient canals along the entire basal edge.
Other noteworthy features that further distinguish the new species from most Melanotaenia include the combination of 15-16 circumpeduncular scales and 18-20 total gill rakers on the first branchial arch
, both values that are relatively high for the genus compared to counts of 11-14 and 1318 respectively for most other species.
The defect is basically related to maldevelopment of first branchial arch
According to Myers, "I've done concentration series, where we give sets of embryos exposures at increasing concentrations, and we get a nice linear curve out of it: more alcohol leads to increasing frequency and severity of midline and branchial arch
With the stylohyoid ligament and the small horn of the hyoid bone, the styloid process forms the stylohyoid apparatus, which arises embryonically from the Reichert cartilage of the second branchial arch
Gillrakers on first branchial arch
5-9+27-31, total 33-40 (modally 8+29, total 36).
6) It is not known which branchial arch
failure is responsible.
Gill-rakers were counted on first left branchial arch
Five new species of genus Astyanax Baird & Girard, 1854 from Rio Iguacu, Parana, Brazil (Ostariophysi, Characiformes, Characidae)/ Cinco novas especies do genero Astyanax Baird & Girard, 1854 do Rio Iguacu, Parana, Brasil (Ostariophysi, Characiformes, Characidae)
As development progresses, the second branchial arch
proliferates caudally and encloses the second, third, and fourth branchial clefts creating an ectodermally lined cavity, the cervical sinus.
In this case, each branchial arch
was composed of a cartilaginous structure, vascular and muscle tissue supporting the branchial filaments (Figure 1).
First branchial arch
anomalies can extend deeply into the neck.
A sudden increase in flow speed marked the correct insertion point, as the flow probe was not in contact with oropharyngeal roof or branchial arch
tissue at this location.
Distinguished from all other congeners by the combination of the following features: anterior portion of trunk slightly deeper than wide, jaws short, snout blunt, tip of anal fin rounded in male, caudal fin rounded in male, pelvic-fin tip not reaching anus in male, dorsal-fin origin on vertical between base of last 3rd and 4th anal-fin rays, dorsal-fin rays 7-8, anal-fin rays 12-14, frontal squamation E-patterned, frontal scales arranged circularly, canal preopercular short and opened, contact organs absent, longitudinal series of scales 37-40, gill rakers of first branchial arch
1-2 + 8, red stripes on flank, jaws not distinctively pigmented, and round black spot on dorsal portion of caudal fin in female.