Results for “pair”

hypurapophysis

Paired, bony lateral extensions off the parhypural. Also known as 'parhypurapophysis'.

Used in 8 profiles

isopod

Any member of the crustacean order Isopda, comprising species with 7 pairs of legs and lacking a fully-formed carapace.

Used in 1 profile

mesocoracoid

Paired bone situated in the pectoral girdle, below the cleithrum.

nauplius

First larval stage in certain crustaceans, comprising an unsegmented body with three pairs of appendages. Important constituent of plankton and the diet of some fishes.

palatine

In morphology, a paired lateral bone above the mouth lying between the vomer and maxillary; the presence or absence of teeth on the palatine is a defining character in the classification of some fishes. Also known as autopalatine.

Used in 12 profiles

parhypurapophysis

Paired bony lateral extensions off the hemal arch of the parhypural. Also known as 'hypurapophysis'.

Used in 1 profile

parietal

Of, relating to, or forming the walls or part of the walls of a body part, organ, cavity, or similar structure. Often used specifically in reference to either of a pair of bones forming much of the upper cranium.

Used in 42 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

pelvic fin

Either of the pair of fins, also known as pelvic fins, attached to the pelvic girdle in fishes that help control the direction of movement. Correspond to the hind legs in higher vertebrates and vary in position depending on taxon. Sometimes absent entirely.

Used in 431 profiles

premaxilla

Either of the paired, dermal bones located in front of and between the maxillary bones in the upper jaw. Often bear teeth.

Used in 49 profiles

pterygoid bone

Paired bone in the roof of the mouth connecting the palatine anteriorly to the quadrate posteriorly.

rib

Any of a series of slender curved bones articulated to the spine in pairs, serving to protect the thoracic cavity.

Used in 50 profiles

scapula

Paired bone attached to the pterygials, actinosts or radials of the pectoral fin. Articulates ventrally with the coracoid and anteriorly with the cleithrum.

sneaker male

Subdominant male individual of certain fish species that attempts to sneak into the nest of a spawning pair and fertilise deposited eggs. Typically smaller in size and/or possessing reduced colouration compared with a normal male. Also known as a sneaky male.

t-position

Stance adopted by a spawning pair in certain fish species in which the two individuals come together in such a way as to resemble a capital letter 'T'. Typical in some callichthyid catfishes, for example.

Used in 31 profiles

territory

In biology, area occupied by an individual, pair or group of animals and often physically defended against others of the same sex or species. May be established on a permanent or temporary basis.

Used in 318 profiles

ventral-fin

Either of the pair of fins, also known as pelvic fins, attached to the pelvic girdle in fishes that help control the direction of movement. Correspond to the hind legs in higher vertebrates and vary in position depending on taxon. Sometimes absent entirely.

Used in 74 profiles

anal-fin

A median, unpaired, ventral fin located between the anus and caudal fin, usually in the posterior portion of the body. Used to maintain equilibrium and stability.

Used in 764 profiles

azygos

Used in reference to an unpaired anatomical structure, e.g., an azygos vein.

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