pair
A male and a female organism of the same species. Also see breeding pair.
Used in 866 profiles
Results for “pair”
Ichthyological terms, not general ones.
paired fins
The pectoral and pelvic/ventral fins, both of which occur in pairs and are analogous to the fore and hind limbs in higher animals.
Used in 58 profiles
unpaired fins
The dorsal, caudal, anal and, if present, adipose fins.
Used in 61 profiles
acid
A substance that can donate protons or accept pairs of electrons. The chemical opposite of a base. Acids have a pH of less than 7.
Used in 123 profiles
antorbital
A small, paired dermal bone lying lateral to the nasal bone in front of the eye.
Used in 2 profiles
arthropod
Any member of the phylum Arthropoda, these being characterised by a (usually) chitinous exoskeleton and segmented body to which jointed appendages are attached in pairs. Arthropods include the insects, crustaceans, arachnids, myriapods, and extinct trilobites, and comprise the largest phylum in the animal kingdom.
Used in 3 profiles
base
The bottom or lowest part of something. Biology. The point of attachment of a part or organ, e.g., a fin. Chemistry. A substance that can accept protons or donate pairs of electrons. The chemical opposite of an acid. Bases have a pH greater than 7.0 and a solution containing one or more bases is often referred to as an alkali.
Used in 1,187 profiles
basipterygium
Basal bone or cartilage located at the base of the paired fins in some fishes.
Used in 2 profiles
branchiostegal ray
One of the dermal, bony (sometimes cartilaginous), bilaterally paired, flattened struts inserting on the epihyal and/or ceratohyal (sometimes the interhyal and hypohyal) that supports the branchiostegal membranes.
Used in 4 profiles
clavicle
Refers to the collar bone in human anatomy. Present in the pectoral girdle of some fishes as a paired, dermal bone ventral to or fused with the cleithrum.
Used in 1 profile
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
couplet
A pair of descriptive statements. Often used in species identification keys to offer the reader a choice resulting in identification of a species or continuation to the next couplet.
decapod
Any member of the crustacean order Decapoda, comprising species possessing 5 pairs of jointed, thorassic limbs such as crabs, crayfish, lobsters and shrimp. Also used historically in reference to molluscs of the Cephalopod superorder Decapodiformes, members of which have 8 short limbs plus 2 longer tentacles and include cuttlefish and squid.
dichotomous key
Species identification key comprising pairs of alternative choices arranged in a series of couplets, used commonly in ichthyological papers.
ectopterygoid
A membrane, paired, bone in the upper jaw, located ventrally on the skull. Some fishes, such as serrasalmids, possess small tooth-like projections known as ectopterygoid teeth on this bone.
Used in 4 profiles
epibranchial organ
Present in some microphagous fishes and comprises a paired dorsal diverticulum located towards the posterior of the pharynx. In the majority of species it's divided into two sections by additional gill rakers which trap small food particles.
F0
Not an official term in genetics, but often used in reference to the founder, or parental, generation in a line of captive-bred organisms. Also used in aquarium literature to refer to wild caught fishes or a pair or group of assumedly unrelated individuals being used for breeding purposes.
fin-spine
Unsegmented and unbranched, bony structure supporting the fins in teleosts. Usually hard, rigid and pointed and may have a smooth or serrated edge. Not laterally-paired like rays, and in some species modified to form a protective structure.
Used in 15 profiles
frontal
Either of the two dermal bone on top of the skull, above the eyes. May be paired or fused.
Used in 42 profiles
hyoid arch
Either of the second pair of pharyngeal or gill arches. Supports part of the tongue and the branchiostegal rays.