Sri Lanka is a tropical island situated close to the southern tip of India. The invertebrate fauna is as large as it is common to other regions of the world. There are about 2 million and counting species of arthropods found in the world. Due to this, it is very difficult to summarize the exact number of species found within a certain region.

The following list is about some minor insect orders recorded in Sri Lanka.

Jumping bristletails
Phylum: Arthropoda
Class: Insecta
Order: Archaeognatha

Archaeognatha, are an insect order of the subclass Apterygota, which means they are insects without wings at any stage of the lifecycle. In the evolution of insects, Archaeognatha are the most primitive insects currently exists in the world. They have elongated bodies and arched backs. They have three long caudal filaments, where two lateral filaments are known as cerci, and the medial one is an epiproct. 350 species of Jumping bristletails belong to two families have been identified. Two species are known from Sri Lanka.

Family: Machilidae
 Graphitarsus phillipsi
 Graphitarsus schmidi

Silverfish
Phylum: Arthropoda
Class: Insecta
Order: Zygentoma

Zygentoma is an insect order of the subclass Apterygota. The order includes silverfish, fishmoths, and the firebrats. All Zygentoma species have three long caudal filaments, where two lateral filaments are known as cerci, and the medial one is an epiproct or appendix dorsalis. There are five families in the order. 3 species are known from Sri Lanka.

Family: Ateluridae
 Assmuthia escherichii

Family: Lepismatidae
 Ctenolepisma calva
 Namunukulina funambuli

Webspinners
Phylum: Arthropoda
Class: Insecta
Order: Embioptera

The order Embioptera, commonly known as webspinners, are a small group of mostly tropical and subtropical insects, classified under the subclass Pterygota. The order has also been referred to as Embiodea or Embiidina. The name Embioptera ("lively wings") comes from Greek, εμβιος, embios meaning "lively" and πτερον, pteron meaning "wing", a name that has not been considered to be particularly descriptive for this group of fliers, perhaps instead referring to their remarkable speed of movement both forward and backward.

Over 360 embiopteran species have been described, along with estimates of around 2000 species being in existence today. There is some debate as to the exact phylogenetic classification of Embioptera, with the order having been classed as a sister group to both orders Zoraptera, and Phasmatodea,

The following list provide the lacewings currently identified in Sri Lanka. Only four species found from this order within the country.

Endemic species are denoted as E.

Family: Oligotomidae
Aposthonia ceylonica
Aposthonia minuscula
Oligotoma humbertiana
Oligotoma saundersii

Booklice
Phylum: Arthropoda
Class: Insecta
Order: Psocoptera

Psocoptera are an order of insects that are commonly known as booklice, barklice or barkflies.  They first appeared in the Permian period, 295–248 million years ago.  They are often regarded as the most primitive of the hemipteroids. Their name originates from the Greek word ψῶχος, psokos meaning gnawed or rubbed and πτερά, ptera meaning wings. There are more than 5,500 species in 41 families in three suborders. Many of these species have only been described in recent years.

The Order Psocoptera is divided into three suborders. According to checklists by Smithers in 1967 and New in 1977, there are 67 accepted species of booklice found from Sri Lanka. The checklist of New was advanced with the full description of two subfamilies Epipsocidae and Pseudocaeciliidae, from Sri Lanka.

Family: Amphientomidae - tropical barklice

Paramphientomum nietneri
Seopsis metallops
Seopsis superba
Seopsis vasantasena
Syllysis caudata
Syllysis erato
Syllysis ritusamhara
Tineomorpha greeniana

Family: Amphipsocidae - hairy-winged barklice
Taeniostigma elongatum

Family: Archipsocidae - ancient barklice
Archipsocopsis biguttata
Archipsocopsis fernandi

Family: Caeciliusidae - lizard barklice

Caecilius  sp.
Coryphosmila dolabrata
Dypsocus coleoptratus
Enderleinella ceylonica
Isophanes palliatus
Valenzuela aridus
Valenzuela maculistigma

Family: Calopsocidae - common barklice
Calopsocus infelix

Family: Ectopsocidae - outer barklice
Ectopsocus aethiops
Ectopsocus piger

Family: Elipsocidae - damp barklice
Elipsocus boops
Elipsocus impressus
Nepiomorpha crucifera

Family: Epipsocidae - elliptical barklice
Epipsocopsis delicata
Epipsocopsis greeni
Epipsocopsis hakgalensis
Epipsocopsis peradenayensis
Epipsocopsis taprobanensis

Family: Hemipsocidae - leaf litter barklice
Hemipsocus chloroticus
Hemipsocus roseus

Family: Lepidopsocidae - scaly-winged barklice

Echmepteryx mihira
Echmepteryx sericea
Lepium chrysochlorum
Lepium luridum
Lepolepis ceylonica
Nepticulomima chalcomelas
Nepticulomima essigkeana
Nepticulomima jacobsoni
Nepticulomima sakuntala
Perientomum acutipenne
Perientomum argentatum
Perientomum ceylonicum
Perientomum chrysargyrium
Perientomum greeni
Perientomum gregarium
Perientomum morosum
Perientomum trichopteryx
Perientomum triste
Proentomum personatum
Soa flaviterminata
Scolopama halterata
Lepolepis ceylonica

Family: Liposcelididae - booklice
Embidopsocus minor
Embidopsocus oleaginus

Family: Myopsocidae - mouse-like barklice
Myopsocus unduosus

Family: Peripsocidae - stout barklice
Peripsocus milloti
Peripsocus pauliani

Family: Philotarsidae - loving barklice
Aaroniella maligawa
Haplophallus orientalis

Family: Pseudocaeciliidae - false lizard barklice

Allopsocus medialis
Heterocaecilius ornatus
Mesocaecilius pictipennis
Ophiodopelma hieroglyphicum
Ophiodopelma multipunctatum
Pseudocaecilius cribrarius
Pseudocaecilius lanatus
Pseudocaecilius molestus
Pseudocaecilius ornatus
Pseudocaecilius paraornatus
Pseudocaecilius zonatus

Family: Psocidae - common barklice
Atrichadenotecnum quinquepunctatum
Blaste obtusa
Copostigma trimaculatum
Psocidus consitus
Psocidus oblitus
Psococerastis taprobanes
Trichadenotecnum circulare

Family: Stenopsocidae - narrow barklice
Stenopsocus apertus
Stenopsocus uniformis

Thrips
Phylum: Arthropoda
Class: Insecta
Order: Thysanoptera

Thrips (order Thysanoptera) are minute, slender insects with fringed wings (thus the scientific name. Other common names for thrips include thunderflies, thunderbugs, storm flies, thunderblights, storm bugs, corn flies and corn lice. Thrips species feed on a large variety of plants and animals by puncturing them and sucking up the contents. A large number of thrips species are considered pests, because they feed on plants with commercial value. Some species of thrips feed on other insects or mites and are considered beneficial, while some feed on fungal spores or pollen. Approximately 6,000 species have been described. Thrips are generally tiny (1 mm long or less) and are not good flyers, although they can be carried long distances by the wind. In the right conditions, like indoor grow rooms or greenhouses, many species can exponentially increase in population size and form large sw