Jump to content

Acromantis japonica (Japanese boxer mantis)

Recommended Posts


  • Scientific and common name: Acromantis japonica (Japanese boxer mantis)
  • Physical description/appearance: L1 nymphs are black and look like tiny ants. Their legs have bands of alternating color (black/brown on gray/tan). As they age they develop a light brown color overall, and the top of their thorax and wings turn green. On the sides of their wings a bright green stripe is visible. Adult females are about 1" (2.5 cm) in size, and adult males are about 3/4" (2 cm).
  • Native range: Southeast Asia - China, Japan, Korea, and Taiwan
  • Difficulty level: Beginner


  • Rate of growth and factors involved: Even though they are a tropical species, room temperature of 72 F (22 C) degrees does not seem to slow their growth (5 months); however, higher temperatures will likely speed it up.
  • Longevity: 10-12 months for females and 7-8 months for males are average.
  • Molting observations: Like most mantids they prefer to molt from the lid of their enclosure.


  • Degree of activity: Very active as nymphs love to run everywhere they can, but with adults they are content to hang from a stick or their enclosure lid. If handled will explore hands and arms.
  • Degree of aggression or timidity: Slightly timid species, likely due to their size.
  • Propensity to cannibalize: Unknown (Always kept separate after L1/L2)
  • Dynamics of threat display: Unknown. If they are startled or frightened, they will run or jump to escape.

Captive Environment

  • Temperature range and humidity levels: 72 to 85 F (22 to 30 C) temperatures, with 60-80% humidity (with the higher humidity for molting nymphs).
  • Type and size of enclosure(s) used: A plastic container that is 3" x 3" x 3" (7.5cm x 7.5cm x 7.5cm) in size is enough for any nymph or adult. I raised mine in Solo 9oz cups, a 32oz deli cup is however more ideal for size.
  • Substrate or lack thereof: I kept a 1/4" (0.6cm) to 1/2" (1.2cm) of coconut fiber, or sphagnum peat moss to help with humidity and for cleaning insets (springtails only, I find isopods are too large for this mantid species as they seem to be stressed out by them).
  • Cage furnishings, e.g. molting surfaces, perches, décor, plants, etc.: They prefer a stick/twig to perch on. Often they will flatten themselves out on it to hide, and to sleep on - typically on the backside.
  • Communal housing if applicable: Unknown (Always kept separate after L1/L2)


  • Feeding response: They like to wait ambushing the prey, but will also actively stalk prey occasionally. Females will accept larger prey than males, even compared to their size.
  • Type and size of prey used and/or refused for various instars: Melanogaster fruit flies for the first few instars, followed by Hydei fruit flies. Adults will eat Blue or Green bottle flies, and crickets to about 1/2" (1.2cm) in size.
  • Quantity and frequency of feedings: I feed mine small amounts daily. As nymphs I fed them about 4-6 fruit flies. Adult females can eat 2 to 3 green/blue bottle flies daily, or a small cricket. Adult males typically eat every 2-3 days, although I try to feed them daily along with my females. I have not noticed this species to become overweight/obese from overeating, as my mantids once full will throw away their food.


  • Sexing/sexual dimorphism (explanation of physical differences and/or adult sizes of the sexes): Females are larger than the males, typically 1/4" (0.6cm) in length, and have a larger girth than the males. The females also have a much rounder abdomen. Segment counting works as expected, with females having 5 (6) and males having 7 (8) segments (depends on if you count the last walking leg segment or not).
  • Time needed from last molt to copulation: 2 weeks.
  • Tips: give us your methodology: I make sure to feed my female all she can eat for several days before breeding. Using a small bamboo skewer, or small sticks or dowel rods, I help to move and position the mantids. I use a 1 quart or larger container for breeding, with plenty of fake ivy and flowers inside for the male to hide when done. I put the female inside on a large stick/branch and offer her a small cricket. Once she is eating I place the male behind her facing her.
  • Tips for inducing copulation and fecundity: If breeding is a issue increasing their breeding container temperature to about 80 F (27 C) makes them more willing to breed.
  • Tips for inducing female to lay oothecae: Provide extra sticks/twigs hot glued to their lids, and at least 1 to 2 running the vertical length as well. The females will lay the ooths usually near a fork of the stick, or at the base of a stick.


  • Physical description and average size: Brown in color (light to dark brown). Measures about 0.19" (5mm) wide, and can range in length from 1/2" (1.2cm) to nearly 1" (2.5cm).
  • Diapause if necessary: Is not needed and will simply kill the eggs - do not diapause.
  • Incubation time and temperature: About 30 days with temperatures of 75 F (24 C).
  • Observed number/s and range of hatching nymphs: 20 to 50 nymphs


  • Health Issues: infections or illnesses encountered: none.
  • Additional Observations: pertinent information which doesn't neatly fit anywhere else: As this is a boxer mantid, nymphs will wave their enlarged femur forearm at one another occasionally. Also both, adult females and adult males, will also participate in a mating dance with their forearms when their habitats are placed side by side.

Contributors: CosbyArt and dmina






Edited by CosbyArt
  • Upvote 2
Link to post
Share on other sites
  • 5 years later...



  • Rate of growth and factors involved: Even though they are a tropical species, room temperature of 72 F (22 C) degrees does not seem to slow their growth (5 months); however, higher temperatures will likely speed it up. "

Hmmm... I don't think Acromantis japonica is tropical.  Technically I think they are "subtropical", which means they live in climates that have freezes during winter. 


Here in Daejeon, South Korea, where I am from it is a temperate climate (I haven't seen any Acromantis when I was there in South Korea, so they might not range as far north as Daejeon.):

Google search "Daejeon Climate": 

     Daily   High/Low
January 38° / 18°3 days

February 43° / 22°3 days

March 54° / 31°7 days

April 67° / 42°8 days

May 76° / 52°7 days

June 82° / 63°8 days

July 86° / 71°16 days

August 86° / 71°15 days

September 79° / 59°10 days

October 69° / 45°4 days

November 55° / 33°7 days

December 43° / 22°6 days
Edited by happy1892
Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...