Hrútagil (Mókollsdalur) (Miocene of Iceland)

Where: Iceland (65.5° N, 21.5° W: paleocoordinates 65.5° N, 21.5° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Skarðsströnd–Mókollsdalur Formation, Tortonian (11.6 - 7.2 Ma)

• The fossil insects are found ca. 50 m below the top of the succession, in a 40–80 cm thick unit composed mostly of alternating fine to coarse ash layers. The age of these sedimentary rocks is between 9 and 8 Ma.

• bed-level stratigraphic resolution

Environment/lithology: crater lake; lithified, diatomaceous tuff

• The sedimentary rocks at Hrútagil apparently accumulated in a large caldera lake and are over 120 m thick.
• The insects are preserved in the finest ash layers. These layers have a minor component of fine clastic material and diatom remains.

Size class: macrofossils

Preservation: adpression

Collection methods: Repository: Icelandic Institute (Museum) of Natural History (IMNH)

Primary reference: O. E. Heie and W. L. Friedrich. 1971. A fossil specimen of the North American hickory aphid (Longistigma caryae Harris), found in Tertiary deposits in Iceland. Entomologica Scandinavica 2:74-80 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 154940: authorized by Matthew Clapham, entered by Matthew Clapham on 21.03.2014

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names
Branchiopoda
 Cladocera - Daphniidae
Daphniidae indet.2
Daphniidae indet.2 Strauss 1820 water flea
>50 ephippia on a slab together
Insecta
 Hymenoptera -
Ichneumonoidea indet.2, Aculeata indet.2
Ichneumonoidea indet.2 Latreille 1802 wasp
IMNH 9129
Aculeata indet.2 Latreille 1802 wasp
IMNH 9143
 Coleoptera - Curculionidae
Curculionidae indet.2
Curculionidae indet.2 Latreille 1802 snout beetle
IMNH 9125, 9135
 Coleoptera - Carabidae
? Carabidae indet.2
? Carabidae indet.2 Latreille 1802 ground beetle
IMNH 9211
 Dicondylia -
Trichoptera indet.2
Trichoptera indet.2 Kirby 1815 caddisfly
IMNH 9304, 9134 (pupae)
 Trichoptera - Limnephilidae
Drusinae indet.2
Drusinae indet.2 Banks 1916 caddisfly
IMNH 9257(9271)
 Hemiptera -
Cercopoidea indet.2
Cercopoidea indet.2 Leach 1815 froghopper
IMNH 9409
 Hemiptera - Aphididae
Longistigma caryae
Longistigma caryae Harris 1841 aphid
IMNH 594
 Dermaptera -
Neodermaptera indet.2
Neodermaptera indet.2 Engel 2003 earwig
IMNH 9147
 Dicondylia -
Plecoptera indet.2
Plecoptera indet.2 Burmeister 1839 stonefly
IMNH 9308
 Diptera -
Brachycera indet.2
Brachycera indet.2 Zetterstedt 1842 fly
IMNH 9146
 Diptera - Bibionidae
Penthetria sp.1, Bibio sp.2, Bibio edda n. sp.1, Dilophus sp.2
Penthetria sp.1 Meigen 1803 march fly
IMNH 9131(9181) - part of Bibio sp. in Wappler et al. (2014)
Bibio sp.2 Geoffroy 1762 march fly
IMNH 9150, 9157, 9164, 9179, 9199, 9218, 9219, 9221, 9223, 9238, 9239, 9240, 9246, 9248, 9258, 9259, 9268, 9273, 9275, 9279, 9283, 9284, 9285, 9286, 9295, 9296, 9303, 9306, 9310 (all others reassigned by Skarveit et al., 2017)
Bibio edda n. sp.1 Skartveit et al. 2017 march fly
IMNH 9151; 74, 75, 9136, 9165, 9217, 9228, 9234, 9298; 594, 9100, 9124, 9127, 9144, 9148, 9152, 9155, 9158, 9161, 9162, 9165, 9172, 9178, 9182, 9200, 9203, 9212, 9214, 9215, 9216, 9217, 9220, 9222, 9224, 9225, 9226, 9227, 9232, 9236, 9237 (three specimens), 9241, 9242, 9249, 9250, 9253, 9255, 9256, 9263, 9267, 9272, 9276, 9278, 9280, 9288, 9291, 9292, 9293, 9297 (three specimens), 9299, 9305, 9311, 9312, F-1
Dilophus sp.2 Meigen 1803 march fly
IMNH 9156
 Diptera - Chironomidae
Orthocladiinae indet.2
Orthocladiinae indet.2 Lenz 1921 non biting midge
IMNH 9153, 9154, 9180, 9194, 9195, 9197, 9114, 9206, 9121, 9132, 9133, 9252
1Skartveit et al. 2017; 2Wappler et al. 2014