Moss carder bee (Bombus muscorum)

Moss carder bee (Bombus muscorum). Photo credit: Dorothy Breckenridge.

 

Species distribution map from https://nbnatlas.org
Red: records 2000-present. Yellow: pre-2000 records.*

A scarce but widespread all-ginger carder bumblebee, found in open flower-rich grasslands where it shows a strong preference for clover, knapweed, red bartsia and similar flower species. The species is more frequent in the north and west, and is largely coastal in the south. Males, workers and queens are similar in appearance, ginger-brown all over with no clearly-delineated tail. The abdomen is usually paler than the thorax, and almost appears blonde in some specimens, often with a more intense colour on the second abdominal segment.

Moss carder bees. Photo credits: James Riall (left), Gordon Drummond (right).

Only three species (Common carderBombus pascuorum; Moss carder, Bombus muscorum; and Brown-banded carder) are all-ginger, and consequently the trio can be easily split off from other bumblebees. A few others (notably the Great yellow bumblebee (Bombus distinguendus) and the Field cuckoo bumblebee (Bombus campestris) can look unicolorous, but these are yellow, rather than ginger, and always have a dark bar between the wing bases.

Separating the three ginger carders can be considerably harder. The Moss carder bee has no black hairs on the abdomen (unlike the Common carder) and also has no black hairs on the thorax (Brown-banded carder bee has a thin scattering of black hairs around and above the wing bases). The presence or absence of a dark abdominal band is not a reliable feature for splitting the species. Males can be separated by their genital capsules.

For more photos visit: https://www.flickr.com/photos/63075200@N07/sets/72157631532901863/
For more detailed information visit: http://www.bwars.com/index.php?q=bee/apidae/bombus-muscorum

* This map displays the data currently publically available on the NBN Atlas website at http://www.nbnatlas.org. Data have been contributed by a range of organisations: see here for the full list.  Please note that records from the national recording body (BWARS) are not yet available on the NBN so this map may appear incomplete.

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