Results for “type designation”

type designation

Determination and selection of the type of a taxon.

seine

Type of net designed to hang vertically in the water with the ends being manually drawn together to catch fishes, and which usually has weights at the lower edge and floats at the top; to fish with such a net.

syntype

Any specimen within a type series if no holotype or lectotype has been designated, the syntypes collectively representing the name-bearing type.

Used in 2 profiles

type series

Series of specimens which either constitutes the name-bearing type of a nominal species or subspecies, or from which the name-bearing type has been or may be designated

Used in 120 profiles

holotype

The single specimen designated as the name-bearing type of a nominal species or subspecies.

Used in 36 profiles

neotype

A single specimen designated as the name-bearing type of a species subsequent to its description, most often when the holotype, lectotype, and syntype no longer exist.

Used in 14 profiles

designation

In icthyology, the nomenclatural act by which the type specimen of a previously or newly-established genus, subgenus, species, or subspecies is fixed via an express statement.

Used in 6 profiles

bioball

Type of biological filter medium consisting of a plastic ball designed in such a way that the available surface area for bacterial colonisation is maximised. The precise form differs depending on manufacturer.

lectotype

In zoological nomenclature, a syntype specimen selected as the name-bearing type of a nominal taxon in the absence of a designated holotype.

Used in 6 profiles

heater

Thermostatically-controlled device used to maintain constant water temperature in an aquarium or pond, also known as a heaterstat. Depending on design, may be installed submersed within the aquarium, sump or substrate (see heating cable) or inline with tubing attached to an external filter. Some types of the latter also have a heating element built in.

Used in 42 profiles

wet/dry filter

Type of filter normally placed under the aquarium, and often home-made. The basic premise is that water trickles vertically downards through separated compartments containing mechanical and biological filter media with spaces inbetween so that it is also exposed to the air briefly. It then collects in a base chamber or sump from where it is pumped back to the main aquarium. There are many commercial designs available, some of which are more effective than others. Not popular in marine reef aquaria due to the associated accumulation of nitrates as by-product.