hatching membrane
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hatching gland — a transversely oriented set of cells located deep to the enveloping layer on the pericardial membrane, especially during the pharyngula period because of the brightly refractile cytoplasmic granules containing hatching enzymes in the cells … Dictionary of ichthyology
pronymphal membrane — Embryonic cuticle covering the pronymphs with simple (hemimetabolus) or sometimes complete (holometabolus) metamorphosis, which are shed by a process similar to molting before or shortly after hatching; embryonic cuticle; paraderm … Dictionary of invertebrate zoology
Life Sciences — ▪ 2009 Introduction Zoology In 2008 several zoological studies provided new insights into how species life history traits (such as the timing of reproduction or the length of life of adult individuals) are derived in part as responses to… … Universalium
orthopteran — /awr thop teuhr euhn/, adj. 1. orthopterous. n. 2. an orthopterous insect. [1895 1900; < NL Orthopter(a) (see ORTHOPTERON) + AN] * * * ▪ insect Introduction broadly, any member of one of four insect orders. Orthopteran has come to be regarded… … Universalium
Anura — ▪ amphibian order Introduction also called Salientia one of the major extant orders of the class Amphibia (amphibian). It includes the frogs (frog) and toads (toad), which, because of their wide distribution, are known by most people around… … Universalium
Egg tooth — In some egg laying animals, the egg tooth is a small, sharp, cranial protuberance used by offspring to break or tear through the egg s surface during hatching. It is present in most birds and reptiles, and similar structures exist in monotremes,… … Wikipedia
animal development — Introduction the processes that lead eventually to the formation of a new animal starting from cells derived from one or more parent individuals. Development thus occurs following the process by which a new generation of organisms is produced by … Universalium
Egg (food) — Chicken egg redirects here. For the causality dilemma, see Chicken or the egg. On the left a chicken egg, the egg most commonly e … Wikipedia
Chicken — Gallus gallus domesticus redirects here. For other subspecies, see Red Junglefowl. Chooks redirects here. For the fast food chain, see Chooks Fresh Tasty. This article is about the animal. For chicken as human food, see Chicken (food). For other… … Wikipedia
arthropod — /ahr threuh pod /, n. 1. any invertebrate of the phylum Arthropoda, having a segmented body, jointed limbs, and usually a chitinous shell that undergoes moltings, including the insects, spiders and other arachnids, crustaceans, and myriapods. adj … Universalium
