Description Caterpillar

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crochets on caterpillar s prolegs



larvae of craesus septentrionalis, sawfly showing 6 pairs of pro-legs.


caterpillars have soft bodies can grow rapidly between moults. size varies between species , instars (moults) small 1 mm 14 cm. head capsule hardened. mandibles tough , sharp chewing (this contrasts adult lepidoptera, have highly reduced or soft mandibles). behind mandibles of caterpillar spinnerets, manipulating silk. antennae present on either side of labrum, small , relatively inconspicuous.


some larvae of hymenoptera order (ants, bees , wasps) can appear caterpillars of lepidoptera. such larvae seen in sawfly suborder. while these larvae superficially resemble caterpillars, can distinguished presence of prolegs on every abdominal segment, absence of crochets or hooks on prolegs (these present on lepidopteran caterpillars), 1 pair of prominent ocelli on head capsule, , absence of upside-down y-shaped suture on front of head.


lepidopteran caterpillars can differentiated sawfly larvae by:



the numbers of pairs of pro-legs; sawfly larvae have 6 or more pairs while caterpillars have maximum of 5 pairs.
the number of stemmata (simple eyes); sawfly larvae have two, while caterpillars have six.
the presence of crochets on prolegs; these absent in sawflies.
sawfly larvae have invariably smooth head capsule no cleavage lines, while lepidopterous caterpillars bear inverted y or v (adfrontal suture).




^ hall, donald w. (september 2014). featured creatures: hickory horned devil, citheronia regalis . university of florida, entomology , nematology department. retrieved 19 september 2017. 
^ caterpillar head anatomy . deviantart.com. 
^ scoble, mj. 1995. lepidoptera: form, function , diversity. oxford univ. press. isbn 0-19-854952-0






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