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not native and usually not yet well established, as exotic plants or animals.
an adventive plant or animal.
Historical Examples

Denmark (Henriksen, 1939): adventive ; origin mostly Jamaica.
The Biotic Associations of Cockroaches Louis M. Roth

England (Bunting, 1955): adventive, on bananas from Dominica.
The Biotic Associations of Cockroaches Louis M. Roth

Hormetica laevigata, Wales (Sandemann, 1934): adventive, in pile of banana sacks.
The Biotic Associations of Cockroaches Louis M. Roth

Euphyllodromia angustata, Sweden (Princis, 1947): adventive.
The Biotic Associations of Cockroaches Louis M. Roth

Neoblattella fratercula, Nebraska (Hebard, 1916b): adventive.
The Biotic Associations of Cockroaches Louis M. Roth

Nauphoeta flexivitta, Denmark (Vestergaard, 1958): adventive.
The Biotic Associations of Cockroaches Louis M. Roth

Capucinella delicatula, California (Caudell, 1931): adventive.
The Biotic Associations of Cockroaches Louis M. Roth

In addition to these, other adventive cockroaches appear from time to time in ports to which they have been carried by ships.
The Biotic Associations of Cockroaches Louis M. Roth

adventive, applied to foreign plants accidentally or sparingly introduced into a country, but hardly to be called naturalized.
The Elements of Botany Asa Gray

Hormetica ventralis, Sweden (Princis, 1947): adventive, in local warehouse of banana company.
The Biotic Associations of Cockroaches Louis M. Roth

adjective
(of a species) introduced to a new area and not yet established there; exotic
noun
such a plant or animal
adventive
(ād-věn’tĭv)
Not native to and not fully established in a new habitat or environment. An adventive plant may be locally or temporarily naturalized without finding conditions that allow it to spread more widely.