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Immature Stages of Orussidae


Detailed information on immature stages of Orussidae is being acquired.  However, Clausen (1940) noted that the mature larva of Oryssus occidentalis Cress. (Fig. 7) (Rohwer & Cushman 1917; H. L. Parker 1934) bears a considerable resemblance to a chalcidoid larva of the same instar.  It is subcylindrical, with 13 body segments, the legs indicated by sclerotized disks, and each segment bears a transverse row of 4-5 short, stout spines at each side of the dorsal median line.  There are 10 pairs of spiracles, located on the last 2 thoracic and the 1st 8 abdominal segments.  Those of the metathorax, which Parker does not diagram, are rudimentary and nonfunctional.  The head is small , with tubercle-like antennae, and the mandibles are narrow and tridentate.


The pupa of the female bears the ovipositor over the dorsum, and it extends forward slightly beyond the head.  The 2nd to 8th abdominal tergites bear transverse rows of spines at the sides.


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  References:   Please refer to  <biology.ref.htm>, [Additional references may be found at: MELVYL Library ]