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Results for “pH”

Ichthyological terms, not general ones.

Species 113Articles 21Glossary 250

  • oesophagus

    Muscular tube through which food passes from mouth to stomach in vertebrates; the gullet. Also spelled 'esophagus'.

  • oligotroph

    An organism able to live in oligotrophic environments.

  • oligotrophic

    Refers to bodies of water containing few nutrients and supporting little in the way of plant life. Opposite of copiotrophic.

    Used in 2 profiles

  • oophagy

    Feeding on eggs either inside or outside the mother's body

  • Ostariophysan

    Fish of the superorder Ostariophysi, members of which are characterised by possession of a Weberian apparatus, i.e., the anterior four or five vertebrae are modified as a protective casing for the bony ossicles which connect the inner ear and swim bladder. The order contains such orders as Cypriniformes, Characiformes, Gymnotiformes, and Siluriformes.

  • ovophilous

    Of or relating to ovophily.

    Used in 17 profiles

  • ovophily

    Reproductive strategy whereby the eggs are laid on a solid surface where they are immediately collected and brooded in the mouth of one or both parents. Seen in some Geophagus spp., for example.

  • paedomorphic

    Of, relating to, or concerned with paedomorphism.

    Used in 16 profiles

  • paleogeography

    Study of the geography of ancient times or epochs, often in relation to geological events.

  • parasphenoid

    Elongate bone located in the base of the skull in many vertebrate organisms.

    Used in 7 profiles

  • parhypurapophysis

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

    Used in 1 profile

  • periphyton

    Sessile, aquatic organisms that live attached to submerged surfaces in aquatic environments. Often complex in form and may comprise organisms from several groups including algae, cyanobacteria, other microbes, and detritus.

    Used in 8 profiles

  • plesiomorphy

    In cladistics, a character or trait shared by two or more taxonomic groups but derived from a remote or much earlier common ancestral form and therefore cannot be used to define a clade. Also known as an ancestral state and generally appears at the base level of a cladogram.

    Used in 2 profiles

  • polymorphism

    The occurrence of different forms, stages, or types in individuals or multiple organisms of the same species independent of sexual variation.

    Used in 2 profiles

  • polyphagous

    Feeding on numerous food types; having a generalistic diet.

  • polyphyletic

    Relating to or characterised by descent from more than one ancestral form. A polyphyletic taxon is therefore one whose members' last common ancestor is not a member of the taxon.

    Used in 275 profiles

  • pterygiophore

    Bony or cartilaginous structures via which the rays of the median fins articulate and connect to the body.

    Used in 31 profiles

  • rheophile

    An organism living or thriving in running water.

    Used in 71 profiles