Results for “anterior”

anterior

Located near or towards the head; forward in position.

Used in 401 profiles

anterior margin

Used to refer to the margin of a fin from its origin to its apex.

Used in 22 profiles

terminal

In ichthyology, situated at or forming the end of, e.g., a 'terminal' mouth is located at the anterior-most part of the head.

Used in 25 profiles

terminal mouth

Mouth located at the anterior-most part of the head with upper and lower jaws of equal length.

Used in 18 profiles

anal-fin origin

Anteriormost point at which the anal fin base is attached to the body.

Used in 108 profiles

ascending process

A vertical process on the anterior part of the premaxillary bone in most teleosts.

Used in 4 profiles

body depth

The vertical distance between the dorsal and ventral margins of the body measured at the base of the pectoral fin where it joins the body. In most icthyological works the greatest dimension, normally anterior to the dorsal fin, is taken but in some cases body depth is measured at the origin of pectoral, pelvic and first anal. Fins or fin bases are not included in the measurement, however.

Used in 85 profiles

coracoid

Paired endochondral bone located at the base of the pectoral fin upon which rest the pterygials or actinosts. Attaches to the cleithrum anteriorly.

Used in 18 profiles

dentary

Anterior, largest and usually only tooth-bearing bone in the mandible.

Used in 59 profiles

dorsal-fin

Median, rayed, unpaired fin located on the dorsal surface (back) of most fishes. Its main purpose is to prevent the animal rolling and enable it to turn sharply. Some species possess more than one dorsal fin, in which case the anterior one is referred to as the first.

Used in 860 profiles

ethmoid

Unpaired skull bone located on the anterior part of the neurocranium and forming a section of the nasal cavity.

Used in 15 profiles

gonopodium

Modified anal fin used in copulation for the transfer of male gametes to a female. In many cases only the anterior part of the fin is modified.

Used in 24 profiles

lacrimal

Bone forming the lower, anterior section of the eye socket and normally the largest of the suborbital bones. Also known as the lachrymal or preorbital.

Used in 1 profile

nasal canal

Section of the cephalic lateral line canal anterior to the eyes.

Ostariophysan

Fish of the superorder Ostariophysi, members of which are characterised by possession of a Weberian apparatus, i.e., the anterior four or five vertebrae are modified as a protective casing for the bony ossicles which connect the inner ear and swim bladder. The order contains such orders as Cypriniformes, Characiformes, Gymnotiformes, and Siluriformes.

pectoral girdle

Bony or cartilaginous structure supporting the forelimbs or anterior fins in vertebrates.

Used in 26 profiles

pectoral-fin

Anterior, paired fin attached to the pectoral girdle of fishes, usually just behind the opercle and corresponding to the forelimbs of higher vertebrates. Assists in controlling direction of movement and swimming speed. Frequently abbreviated to 'P' or 'P1' in scientific papers.

Used in 508 profiles

postoral pouch

A transverse, hollow, pouch-like structure opening anteriorly and located on the ventral surface, immediately posterior to the mouth, in some members of certain balitorid genera, e.g., Gastromyzon, Neogastromyzon.

Used in 13 profiles

pre-

Anterior; in front of.

preanal

Area or region anterior to the anus.

Used in 3 profiles