Ichthyological terms, not general ones.
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
Length of a fish specimen measured from the tip of the snout to the end of the medial caudal fin rays, i.e., the deepest point of the 'fork' formed by the fin. Tends not to be used in systematics.
Either of the second pair of pharyngeal or gill arches. Supports part of the tongue and the branchiostegal rays.
Of, relating to, forming or being one of the partially-fused hemal spines that support the caudal fin rays in most teleosts.
Used in 19 profiles
Series of bones to which the caudal fin rays are attached.
Located between two fin rays or spines.
Used in 2 profiles
The membrane connecting fin rays and spines in fishes.
Used in 15 profiles
Bony process or plate at the base of the first ( unbranched ) and second ( first branched ) ray of the pectoral-fin in most male specimens of the family Cobitidae. It is also known as 'Canestrini's scale'.
Used in 24 profiles
Lance or spear-shaped; gradually tapering to a point. Used to describe the shape of a caudal fin with long central rays.
Used in 19 profiles
Bony structures that form segments of the soft fin rays in Osteichthyes.
Used in 1 profile
A countable trait, e.g., the number of rays in a fin, gill rakers, lateral line scales, etc..
Used in 4 profiles
In ichthyology, the counting of quantitative characters, such as the number of fins, fin rays or scales.
Used in 8 profiles
Tooth-shaped scale-type found in certain fishes, e.g., sharks, rays. Structurally homologous with vertebrate teeth.
Of fin rays, inclined forwards or placed progressively farther forwards.
Used in 1 profile
Bony or cartilaginous structures via which the rays of the median fins articulate and connect to the body.
Used in 31 profiles
In ichthyology, a bony or cartilaginous support for a fin ray or spine.
Used in 15 profiles
Invisible, continuous spectrum of light having a wavelength just shorter than the violet end of the visible spectrum but longer than that of x-rays.
Any member of the predominantly aquatic arthropod grouping Crustacea which currently contains almost 70,000 recognised species, including all crabs, lobsters, crayfish, shrimp, krill and barnacles. It's difficult to define their characteristics since the group is of arguable hierarchical status, generally regarded to represent either a Phylum or Subphylum.
Used in 421 profiles
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.
Large filter particularly suitable for outdoor ponds and large aquaria, consisting of a series of vertically-arranged chambers filled with one or more types of media. Water is pumped to the top chamber where it is dispersed, most often using a spray bar. It then percolates down through the other chambers via gravity before being returned to the pond or aquarium.