(n.) An animal having six feet; one of the Hexapoda.
Example Sentences:
(1) The cercal system, which may have evolved with the first terrestrial hexapods, reaches its zenith in the orthopteroid insects, but was replaced in holometabolan insects by visual startle mechanisms with descending giant interneurons.
(2) Maximum parsimony analyses and monophyly testing within arthropods indicate that myriapods (millipedes and centipedes) form a sister group to all other assemblages, whereas crustaceans (shrimps and lobsters) plus hexapods (insects and allied groups) form a well-supported monophyletic group.
(3) Recaptured migrants with infected ticks indicate that they transmit B. burgdorferi to hexapod larvae.
(4) Parsimony analysis further suggests that onychophorans form a sister group to chelicerates (spiders and scorpions) and crustaceans plus hexapods, but this relationship is not well supported by monophyly testing.
(5) The vectors are the hexapod larvae of Rhipicephalus sanguineus, R. turanicus and H. truncatum; the filarial infective stages appear during the larval-nymph moult of the vector (11 days at 26 degrees C).
(6) Histological and ultrastructural analysis of the development of C. roussilhoni--a filarial parasite of A. africanus with skin-dwelling microfilariae--in the hexapod, larva of R. sanguineus.
Tetrapod
Definition:
(n.) An insect characterized by having but four perfect legs, as certain of the butterflies.
Example Sentences:
(1) In tetrapods, there are at least three possibilities.
(2) The saccular orientations are significantly different from those in tetrapods.
(3) We speculate, therefore, that the putative gene duplication that led to pancreatic polypeptide in the higher vertebrates took place after the time of divergence of fish and tetrapods.
(4) One of the divergent domains (DD8) consists of two regions of length variation separated by a short segment that is conserved at least throughout tetrapods.
(5) The phylogenetic and ontogenetic changes in the octavolateralis system of sarcopterygian fish and tetrapods, presumed to be important for the formation of an amphibian auditory system, are reviewed.
(6) The diversity of tetrapods increased from the Devonian to the Permian, remained roughly constant during the Mesozoic, and then began to increase in the late Cretaceous, and continued to do so during the Tertiary.
(7) Renin and JGC have been found in the kidneys of tetrapods and teleostean fishes.
(8) A tetrapod-like hypothalamo-hypophysial portal system and a persistent bucco-hypophysial canal are present in Megalops cyprinoides.
(9) Also, the evolution of hypercalcemic regulation in tetrapods will be discussed in the light of recent developments.
(10) These data, correlated with previous ones obtained on tetrapods, affirm the principle that there is a phylogenetic decline in the quantitative innervation of the vertebrate appendage.
(11) It appears that in non-mammalian tetrapods, namely birds and amphibians, the proteolytic processing of the pro-vasotocin involves only one cleavage, releasing the hormone moiety and a "big" neurophysin with two domains homologous to mammalian MSEL-neurophysin and copeptin, respectively.
(12) However, the fossil record of tetrapods has the advantages that it is easier to establish a phylogenetic taxonomy than for many invertebrate groups, and there is the potential for more detailed ecological analyses.
(13) The glycoconjugates of the extrapulmonary airways of 11 tetrapode vertebrates have been characterized by means of both conventional and lectin histochemistry.
(14) In some respects, Torpedo appeared closer to tetrapods than trout.
(15) The tetrapod and teleost PRLs share 34 common residues and these conserved residues are clustered in six domains (PD1 to PD6), suggesting that these common residues, or at least part of them, are responsible for the activities common to all PRLs.
(16) Comparable right and left wing bones of three species of bats failed to demonstrate one-sided dominance, although such dominance is widespread in tetrapods.
(17) Among living fish, the coelacanth Latimeria chalumnae (Actinistia), which is the only recent representative of the Crossopterygii (Actinistia and Rhipidistia), the lungfish (Dipnoi) and ray-finned fish (Actinopterygii), have each been considered as sister-groups of the tetrapods.
(18) The appearance of the membrane-bounded granules depends on the fixative used; after fixation with glutaraldehyde the granules are of a size and electron-density comparable to that found in tetrapod Merkel cells, but after fixing in osmium tetroxide the granules are inconspicuous.
(19) Meyer and Wilson's (1990) 12S rRNA phylogeny unites lungfish and tetrapods to the exclusion of the coelacanth.
(20) MCH stimulates melanosome aggregation within teleost melanocytes but also exhibits MSH-like (melanosome dispersing) activity on tetrapod (frog and lizard) melanocytes.