By David Chiszar, Charles W. Radcliffe, Kent M. Scudder, David Duvall (auth.), Dietland Müller-Schwarze, Robert M. Silverstein (eds.)
The first quantity during this sequence seemed in 1977, the second one in 1980. From those volumes and the current one, a little analysis developments in chemical verbal exchange could be perceived. within the 1977 quantity, stories on thirteen animal taxa have been said. within the current quantity, the quantity is 25. This taxonomie diversi fication of study because the first quantity of this sequence demon strates the wide range of ecological adaptions, even supposing no new common rules of chemical verbal exchange have ernerged. extra extra, divergences in chemical comrnunication less than the species point became extra obvious. commonly, extra subtle observa tions and methods have resulted in larger information of the com plexities in chemical communique. As such knowledge has additionally constructed within the box of insect chemical verbal exchange, there was a corresponding bring up within the id of the chemicals concerned. even though, within the vertebrates, no such correlation exists; within the current quantity, conclusive chemical identifications of semiochemicals are impressive via their paucity.
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21:418-425. , Radcliffe, C. , and Smith, H. , 1978, Chemosensory searching for wounded prey by rattlesnakes is released by striking: A replication report, Herpetol. , 9:54-56. , Radc1iffe, C. , Smith, H. , 1981, Effect of prolonged food deprivation in response to prey odors by rattlesnakes, Herpetologica, 37:237-243. Chiszar, D. and Scudder, K. , 1980, Chemosensory searching by rattlesnakes during predatory episodes, in: "Chemical Signals: Vertebrates and Aquatic Invertebrates," D. Muller-Schwarze and R.
Incisive foramina indicated by arrow. Fr~m Duvall (1982a), courtesy of The Smithsonian Institution Press. What about the mammal-like reptiles? Not much can be hypothesized about the pelycosaurs based upon fossil morphology, since they had not evolved a secondary palate. However, as soon as the s e condary palate begins to appear in fossil r emains of the theraps ids, an accepted homology with the same structure in mammals, so do maxi llary/premaxillary incisive foramina (see Broom, 1937; Duvall, 1982a).
Both of which suggest that some sort of "suckling", and even maternal care may have characterized patterns of therapsid or even early mammalian parental investment (Brink, 1957; Duvall, 25 D. DUVALL ET AL 26 t ' Prototheria 1 t Theria / Earliest Mammals . ) Fig. 1. A dendrogram of tentative relations of basal repti1es, synapsids, and mammals. A. , 7:413-417. 1982a; Guillette, 1982; Pond, 1977). Our goal here is to draw attention to another likely aspect of the pa1eobiology of synapsids, and therapsids in particular.