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edited Jan 12, 2022 at 20:33

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Short answer

I think this could possibly be the nymph of some sort of cockroach.

Long answer

I initially thought these were aphids of some type due to their pear-like body shapes and the small pair of upright projections coming off their backsides (possibly cornicles?).

However, zooming into some of your more-detailed specimens in the 2nd photo immediately made me questions this:

Your specimen appears to lack a prominent cauda sticking off the center of their backside; further, they appear to have some sort of palps around the mouth and a fairly hypognathus head -- all of these characteristics are inconsistent with any aphids I know.

Lack of a furcula (among other details) rules out springtails.

Your specimens appear to have filiform antennae, which doesn't preclude aphids or many other insect orders including beetles, roaches, and orthopterans (e.g., grasshoppers).

Your one specimen appears theyto have a prominent posterior femur (upper part of leg), suggesting these insects may be good jumpers. However, it could be that the enlarged region is in fact a coxa or that other enlarged femurs are simply less apparent from your photo. Regardless, given the enlarged leg and your observed running behavior, I'd guess these are cursorial legs adapted for -- in fact -- running! [See here for more on legs].

Running vs jumping rules out orthoptera nymphs of any kind.

Given the head type, body shape, mouth parts, rear projections (likely cerci not cornicles), and rear leg anatomy, I suppose this is some sort of cockroach (Blattodea) nymph.

Here is an example:

^{Ectobius pallidus - young nymph (<3mm) ; Source: JungleDragon}

Due to the poor quality of the photo, I think I'll stop here. You'll have to explore possible species based on your ability to ascertain in-person detail.

Alternatively, someone else might know a more specific group/species and/or may propose another order of insect all together. We'll see..

I'll consider updating if you provide additional detail.

^{Also, I'm going to pitch the informative Insects information page from NC State University: https://content.ces.ncsu.edu/extension-gardener-handbook/4-insects}

Short answer

I think this could possibly be the nymph of some sort of cockroach.

Long answer

I initially thought these were aphids of some type due to their pear-like body shapes and the small pair of upright projections coming off their backsides (possibly cornicles?).

However, zooming into some of your more-detailed specimens in the 2nd photo immediately made me questions this:

Lack of a furcula (among other details) rules out springtails.

Your specimens appear to have filiform antennae, which doesn't preclude aphids or many other insect orders including beetles, roaches, and orthopterans (e.g., grasshoppers).

Your one specimen appears they have a prominent posterior femur (upper part of leg), suggesting these insects may be good jumpers. However, it could be that the enlarged region is in fact a coxa or that other enlarged femurs are simply less apparent from your photo. Regardless, given the enlarged leg and your observed running behavior, I'd guess these are cursorial legs adapted for -- in fact -- running! [See here for more on legs].

Running vs jumping rules out orthoptera nymphs of any kind.

Given the head type, body shape, mouth parts, rear projections (likely cerci not cornicles), and rear leg anatomy, I suppose this is some sort of cockroach (Blattodea) nymph.

Here is an example:

^{Ectobius pallidus - young nymph (<3mm) ; Source: JungleDragon}

Due to the poor quality of the photo, I think I'll stop here. You'll have to explore possible species based on your ability to ascertain in-person detail.

Alternatively, someone else might know a more specific group/species and/or may propose another order of insect all together. We'll see..

I'll consider updating if you provide additional detail.

^{Also, I'm going to pitch the informative Insects information page from NC State University: https://content.ces.ncsu.edu/extension-gardener-handbook/4-insects}

Short answer

I think this could possibly be the nymph of some sort of cockroach.

Long answer

I initially thought these were aphids of some type due to their pear-like body shapes and the small pair of upright projections coming off their backsides (possibly cornicles?).

However, zooming into some of your more-detailed specimens in the 2nd photo immediately made me questions this:

Lack of a furcula (among other details) rules out springtails.

Your specimens appear to have filiform antennae, which doesn't preclude aphids or many other insect orders including beetles, roaches, and orthopterans (e.g., grasshoppers).

Your one specimen appears to have a prominent posterior femur (upper part of leg), suggesting these insects may be good jumpers. However, it could be that the enlarged region is in fact a coxa or that other enlarged femurs are simply less apparent from your photo. Regardless, given the enlarged leg and your observed running behavior, I'd guess these are cursorial legs adapted for -- in fact -- running! [See here for more on legs].

Running vs jumping rules out orthoptera nymphs of any kind.

Given the head type, body shape, mouth parts, rear projections (likely cerci not cornicles), and rear leg anatomy, I suppose this is some sort of cockroach (Blattodea) nymph.

Here is an example:

^{Ectobius pallidus - young nymph (<3mm) ; Source: JungleDragon}

Due to the poor quality of the photo, I think I'll stop here. You'll have to explore possible species based on your ability to ascertain in-person detail.

Alternatively, someone else might know a more specific group/species and/or may propose another order of insect all together. We'll see..

I'll consider updating if you provide additional detail.

^{Also, I'm going to pitch the informative Insects information page from NC State University: https://content.ces.ncsu.edu/extension-gardener-handbook/4-insects}

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created Dec 26, 2021 at 23:33

theforestecologist ♦

30.4k
10
124
208

Short answer

I think this could possibly be the nymph of some sort of cockroach.

Long answer

I initially thought these were aphids of some type due to their pear-like body shapes and the small pair of upright projections coming off their backsides (possibly cornicles?).

However, zooming into some of your more-detailed specimens in the 2nd photo immediately made me questions this:

Lack of a furcula (among other details) rules out springtails.

Your specimens appear to have filiform antennae, which doesn't preclude aphids or many other insect orders including beetles, roaches, and orthopterans (e.g., grasshoppers).

Running vs jumping rules out orthoptera nymphs of any kind.

Given the head type, body shape, mouth parts, rear projections (likely cerci not cornicles), and rear leg anatomy, I suppose this is some sort of cockroach (Blattodea) nymph.

Here is an example:

^{Ectobius pallidus - young nymph (<3mm) ; Source: JungleDragon}

Due to the poor quality of the photo, I think I'll stop here. You'll have to explore possible species based on your ability to ascertain in-person detail.

Alternatively, someone else might know a more specific group/species and/or may propose another order of insect all together. We'll see..

I'll consider updating if you provide additional detail.

^{Also, I'm going to pitch the informative Insects information page from NC State University: https://content.ces.ncsu.edu/extension-gardener-handbook/4-insects}