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Table I
Preliminary assessment of the conservation status (IUCN, 2001, 2008) of bumblebee species across their entire ranges in relation to complete extinction (so species that are threatened in some European countries but which have unthreatened Asian populations may be considered of least concern). Many provisional judgments (marked *) are based on the frequency with which recent specimens have been seen in collections around the world. All species not listed here are considered to be of LEAST CONCERN.
| Category | Bombus species | Criterion | Source | Location |
|---|---|---|---|---|
| EXTINCT | rubriventris | unrecorded since Lepeletier, 1835 (date of specimen unknown) | Williams, 1998 | Brazil or Caribbean |
| melanopoda | unrecorded since Cockerell, 1910 (date of specimen 1878–1883) | Williams, 1998 | S Sumatra | |
| CRITICALLY ENDANGERED | franklini | A2: > 80% population reduction since 1995 (inferred), causes may not be reversible and may not yet have ceased, based on few records of individuals in the last 4 years | IUCN, 2008; Thorp, 2005; Thorp & Shepherd, 2005 | S Oregon + N California |
| affinis | A2: > 80% population reduction since 1995 (inferred), causes may not be reversible and may not yet have ceased, based on very few records of individuals in the last 4 years | Thorp & Shepherd, 2005; Colla & Packer, 2008 | E North America | |
| ENDANGERED | terricola (including the western colour form occidentalis) | A2: > 50% population reduction since 1995 (inferred), causes may not be reversible and may not yet have ceased, based on very few records of individuals in the last 4 years, at least in the south-eastern and south-western quarters of its range | Thorp & Shepherd, 2005; Colla & Packer, 2008 | North America |
| VULNERABLE | confusus, cullumanus, fragrans | A2: substantial decline in area of occurrence and numbers of records in > 50% of the range since 1950 | * | Europe |
| genalis, irisanensis | A2: no records known since 1983 | * | Asia | |
| NEAR THREATENED | gerstaeckeri, inexspectatus, mucidus, pomorum, sulfureus, velox | small area of occurrence (most 1-2 grid cells), few sites since 1980, habitat at least potentially under human threat | * | Europe |
| haueri, macgregori, trinominatus | small area of occurrence (most 1-2 grid cells), few records since 1980, habitat at least potentially under human threat | * | Central America | |
| abnormis, angustus, braccatus, makarjini, mirus, monozonus, simillimus | small area of occurrence (most 1-2 grid cells), few records since 1980, habitat at least likely to be under human threat | * | Asia (incl. China) | |
| atripes, sporadicus | formerly widespread, no records seen since 1995, habitat at least likely to be under human threat | * | China | |
| LEAST CONCERN | mlokosiewitzii, perezi | small area of occurrence (1-2 grid cells), some records since 1980 or else habitat inaccessible, and habitat not known to be under immediate human threat | * | Europe |
| avinoviellus, beaticola, fedtschenkoi, formosellus, himalayanus, kotzschi, luteipes, parthenius, pressus, obtusus, oceanicus, richardsiellus, semenovianus, sonani, superbus, tanguticus | small area of occurrence (1-2 grid cells), some records since 1980 or else habitat inaccessible, and habitat not known to be under immediate human threat | * | Asia |