Japanese cockroach

Initial first-instar nymphs are dark brown, with white or brownish white tips of the maxillary and labial palps. Adults measure {{convert|25–35|mm|cm|frac=16}} in length, and have a shiny, uniformly black to blackish-brown body, with brown tarsi and maxillary and labial palps. The adult male's wings extend slightly beyond the body's length, while the female's wings are around half the body's length.

Unlike most cockroaches, the major hydrocarbon in P. japonica’s cuticular lipids is {{visible anchor|cis-9-nonacosene}}.{{cite book|author=Morris Rockstein|title=The Physiology of Insecta|url=https://books.google.com/books?id=_AUQ_wntE8gC&pg=PA236|access-date=9 December 2013|date=2 December 2012|publisher=Elsevier Science|isbn=978-0-323-16157-2|page=236}} Males have significant amounts of {{visible anchor|cis-9-heptacosene}} not found on females, as do P. australasiae and P. fuliginosa males and females. Glucose, myo-inositol, scyllo-inositol and trehalose were found in overwintering nymphs and are thought to be a factor in their freeze tolerance.

Nymphs have been observed in the wild hibernating in subfreezing temperatures during winter in snow-covered habitats.{{cite journal|last1=Yuichiro|first1=Tabaru|last2=Atsushi|first2=Kobayashi|title=Outdoor hibernation of Periplaneta japonica (Blattaria: Blattidae) in snowy area|journal=Japanese Journal of Sanitary Zoology|volume=22|issue=2|year=1971|pages=76–77|language=ja, en|url=http://ci.nii.ac.jp/els/110003822562.pdf?id=ART0004993145&type=pdf&lang=jp&host=cinii&order_no=&ppv_type=0&lang_sw=&no=1386583586&cp=|access-date=9 December 2013}} Overwintering nymphs were able to survive laboratory supercooling experiments in the {{convert|-5 to -8|C}} temperature range, enduring 12 hours of tissue freezing,{{cite journal | last1 = Tanaka | first1 = Kazuhiro | last2 = Tanaka | first2 = Seiji | date = October 1997 | title = Winter Survival and Freeze Tolerance in a Northern Cockroach, Periplaneta japonica (Blattidae : Dictyoptera) | journal = Zoological Science | publisher = The Zoological Society of Japan | volume=14 | issue=5 | pages=849–853 | issn=0289-0003 | url=http://ci.nii.ac.jp/naid/110003323491 | access-date = 9 December 2013 | doi=10.2108/zsj.14.849| doi-access = free }} as well as recover from burial in ice.{{cite journal | last1 = Tanaka | first1 = S | date=May 2002 | title=Temperature acclimation in overwintering nymphs of a cockroach, Periplaneta japonica: walking on ice | journal=Journal of Insect Physiology| volume=48 | issue=5 | pages=571–583 | doi=10.1016/s0022-1910(02)00077-x| pmid = 12770085 }} The ability to walk on ice was also found to be unique among several cockroach species tested.

Primarily an outdoors species, populations are adaptable to living indoors in houses and buildings where food is stored, prepared, or served.

A P. japonica nymph alone or in sparse populations accumulates a viscous secretion along its rear dorsal surface, droplets of which it can be splashed some distance toward a threat through a shaking action. The presence of an aggressive species of ant, Formica exsecta, triggered this defensive response, rendering the ants helpless.{{cite journal |last1=Ichinose |first1=T |last2=Zennyoji |first2=K |year=1980 |title=Defensive behavior of the cockroaches, Periplaneta fuliginosa Serville and P. japonica Karny (Orthoptera: Blattidae) in relation to their viscous secretion |url=http://www.cabdirect.org/abstracts/19810584258.html |journal=Applied Entomology and Zoology |volume=15 |issue=4 |pages=400–408 |doi=10.1303/aez.15.400 |issn=0003-6862|access-date=9 December 2013|doi-access=free }}

Originally from Japan, P. japonica has spread to China, Korea and far eastern Russia, though it is considered a common pest primarily in central and northern Japan.{{cite book|last=Robinson|first=William H.|title=Urban Insects and Arachnids: A Handbook of Urban Entomology|url=https://books.google.com/books?id=aluUgDVYJ8wC&pg=PA56|access-date=9 December 2013|date=14 April 2005|publisher=Cambridge University Press|isbn=978-0-521-81253-5|page=56}}{{cite book|last1=Resh|first1=Vincent H.|last2=Cardé|first2=Ring T. |title=Encyclopedia of Insects|url=https://books.google.com/books?id=Jk0Hym1yF0cC&pg=PA110|access-date=9 December 2013|date=22 July 2009|publisher=Academic Press|isbn=978-0-08-092090-0|page=110}}{{cite web|website=Catalogue of Life|title=Catalogue of Life – 19th November 2013: Species details|url=http://www.catalogueoflife.org/col/details/species/id/12679594|access-date=9 December 2013|archive-date=13 December 2013|archive-url=https://web.archive.org/web/20131213124334/http://www.catalogueoflife.org/col/details/species/id/12679594|url-status=dead}}

The species was found in New York City in 2013 by Evangelista et al.,{{cite book | last1=Foottit | first1=R. | last2=Adler | first2=Peter H. | title=Insect Biodiversity : Science and Society | publication-place=Hoboken, NJ, USA | isbn=978-1-118-94556-8 | oclc=972640368 | edition=2 | date=2017 | pages=xxxi+867}} {{isbn|978-1-78064-537-7}}. {{isbn|9781118945537}}.{{rp|page=581}}{{cite book | last=Dhang | first=Partho | title=Climate Change Impacts on Urban Pests | publication-place=Boston, MA, USA | date=2016 | isbn=978-1-78064-538-4 | oclc=950084506 | series=CABI Climate Change Series – Climate and Weather Series | volume=10 | pages=ix+189}} {{isbn|9781780645377}}.{{rp|page=40}}{{cite journal | last1=Evangelista | first1=Dominic | last2=Buss | first2=Lyle | last3=Ware | first3=Jessica L. | title=Using DNA Barcodes to Confirm the Presence of a New Invasive Cockroach Pest in New York City | journal=Journal of Economic Entomology | publisher=Entomological Society of America (OUP) | volume=106 | issue=6 | date=2013-12-01 | issn=0022-0493 | doi=10.1603/ec13402 | pages=2275–2279| pmid=24498724 | doi-access=free }} the first time the species was found in the United States. It was found by an exterminator beneath plantings in High Line, a Manhattan park, and was able to survive over a cold winter.{{cite book|last1=Frishman|first1=Austin M.|last2=Bello|first2=Paul J.|title=The Cockroach Combat Manual II|date=October 2013 |url=https://books.google.com/books?id=qU1AAQAAQBAJ&pg=PA8|access-date=9 December 2013|publisher=Author House|isbn=978-1-4918-2064-3|page=8}} Scientists who confirmed the identity of the species through genetic testing theorize that it may have been imported in the soil of ornamental plants used in the park.{{cite news | author= | date=9 December 2013 |title=Cockroach that can endure cold moves into NYC |url=https://www.usatoday.com/story/news/nation/2013/12/09/invasive-cockroach-nyc/3914719/ |newspaper=USA Today |access-date=9 December 2013}} This identification demonstrates the use of DNA barcoding for urban pest control.

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Category:Cockroaches

Category:Insects described in 1908