Parasites find it counterproductive to kill their hosts; parasitoids live to kill their hosts/kill their hosts to live. Biologists who gather June bug grubs to rear for experiments often find themselves with a wasp collection instead. Their antennae are long and the females have an elongated, cylindrical, articulated metasoma. American Pelecinid wasps ( Pelecinus polyturator) (APWs) are one of the BugLady’s favorite insects. Along with the label parasitoid, they are also classed as endoparasites (endo meaning that the larva is feeding from the inside).
Previous Post. Mom reaches down into the soil with that wonderful, jointed, flexible abdomen and determines the presence of the larva (grub) of a May/June beetle. Wasp larva scavenges remains and pupates there in soil. Some parasitoids prefer live food and eat around their host’s vital organs until it’s time for the End Game. It is so strange that it is placed in its own family, the Pelecinidae. Along with the label parasitoid, they are also classed as endoparasites (endo meaning that the larva is feeding from the inside). Not only is their habit considered highly evolved, they often co-evolved with their hosts. The female uses her long abdomen to deposit eggs underground and the larvae feed upon the grubs of June Beetles. APWs are relatively common from Argentina through Canada, in woodlands, grasslands and gardens, from mid-summer to early fall. North of the Rio Grande. The term necrotroph from the Greek nekros (dead body) and trophe (nourishment) applies. She deposits her egg directly into/onto the grub and goes her merry way, and when her larva hatches, it dives in. The only question is—how fast. Biologists who gather June bug grubs to rear for experiments often find themselves with a wasp collection instead. Furthermore, only the females are commonly seen, leading to speculation that at least temperate climate populations reproduce without males. APWs do the deed quickly because they don’t mind eating dead tissue. A female may measure almost 2 ½ inches long, and her abdomen is five times the length of the rest of her body; males are only about an inch long. 2 I like This They belong in the family Pelecinidae, and they are a New World wasp (with distant, fossilized/amber-ized relations from the Old World). Of the 18,000 species of ants, bees and wasps in North America, the pelecinid wasp is among the most interesting. These beauties are sometimes called scorpionflies, a nod to their long, curved abdomens. But don't worry, that 'stinger' isn't what it … Image Credit: Shannon Z. from Winnipeg, Manitoba, Updated: 7/22/2019; In North American populations, males are rare--just a few examples here: In temperate populations reproduction is apparently largely by parthenogenesis / thelytoky (Brues 1928). This insect is so unusual it shares its family (Pelecinidae) with just three other species in the world, with no others in North America. Ah, the surprising American Pelecinid wasp! She then lays one egg on … Surprising because it is an impressive insect to see flying through the air; because despite similarities in size and shape, it is not a damselfly; because it appears to have a fierce stinger but appearances can be deceiving; because it is the lone remaining genus in its family; and because it’s got that parthenogenesis thing going.
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