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Results for “posterior”

Ichthyological terms, not general ones.

Species 56Articles 5Glossary 22

  • posterior

    Located near or towards the rear end; further back in position.

    Used in 396 profiles

  • standard length

    Measurement taken from the tip of the snout to the midlateral, posterior edge of the hypural plate or posterior edge of the last vertebra, thus excluding the caudal fin. May also exclude the length of the lower jaw should it project beyond the snout. It is the standard scientific measurement used for most fish species because the caudal fin easily becomes damaged in preserved specimens. Abbreviated to SL.

    Used in 48 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

  • anguloarticular

    A compound bone formed by the fusion of the dermal angular and the cartilaginous articular and comprising the posterior part of the lower jaw.

    Used in 5 profiles

  • axial

    Located on, around, or in the direction of an axis running antero-posteriorly through the centre of a fish. Opposite of radial.

    Used in 2 profiles

  • cardioid scale

    A scale possessing a distinct notch on the posterior margin.

  • caudal peduncle

    The typically narrow section of the body located between the posterior of the dorsal and anal fins and caudal fin origin. Its depth is measured vertically at the narrowest point.

    Used in 394 profiles

  • ctenoid scale

    Scale type having ctenii on the posterior edge and a consequent rough texture.

    Used in 22 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.

  • epural

    Located on the dorsal side of the caudal fin; elongate bone which supports the caudal fin rays, positioned above the urostyle and posterior to the last neural spine.

    Used in 8 profiles

  • head length

    Normally a straight-line measurement taken from the tip of the upper lip to the posterior edge of the operculum.

    Used in 68 profiles

  • humeral process

    Bony process extending posteriorly from the pectoral girdle, above the base of the pectoral fin. Present only in certain fishes.

    Used in 8 profiles

  • nape

    In fishes, the part of the dorsal surface between the posterior edge of the skull and dorsal fin insertion.

    Used in 37 profiles

  • opercle

    Bone forming the upper, posterior portion of the operculum, sometimes bearing spines or spine-like structures. Normally the largest of the bones comprising the operculum.

    Used in 149 profiles

  • parhypural

    The most posterior hemal arch with an open canal through which the dorsal aorta passes.

  • postdorsal

    Located posterior to the dorsal fin.

    Used in 23 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

  • precaudal

    In front of the caudal fin or posterior end of the body.

    Used in 13 profiles

  • preopercle

    Bone forming the posterior and lower margins of the cheek; the anteriormost bone of the opercle. Also known as the preoperculum.

    Used in 62 profiles