Beetles “in red”: are the endangered flat bark beetles Cucujus cinnaberinus and C. haematodes chemically protected? (Coleoptera: Cucujidae)

Figures & data

Figure 1. Cucujus haematodes (left) and C. cinnaberinus (right) adults. Scale bar: 1 mm.

Table I. Chemical compounds identified in adults of Cucujus haematodes and C. cinnaberinus (tR = retention time).

Peak no.	tR	Compound	Chemical group	C. haematodes ♂♂	C. cinnaberinus ♂♂
1	9.5	Tetradecanal	Aldehyde		X
2	9.76	Unidentified ester	Ester		X
3	10.2	Atraric acid	Ester	X
4	11.59	Benzene, (1-methyldodecyl)-	Hydrocarbon		X
5	11.62	Heptadecanal	Aldehyde	X
6	11.83	n-Hexadecanoic acid	Organic acid	X	X
7	12.26	Octadecanal	Aldehyde		X
8	12.91	Oleic acid	Organic acid	X	X
9	13.04	Octadecanoic acid	Organic acid	X	X
10	13.82	Unidentified hydrocarbon	Hydrocarbon		X
11	14.35	Unidentified hydrocarbon	Hydrocarbon		X
12	14.71	Dehydroabietic acid	Organic acid	X	X
13	14.92	Unidentified hydrocarbon	Hydrocarbon	X	X
14	16.33	Unidentified hydrocarbon	Hydrocarbon	X
15	16.6	Unidentified hydrocarbon	Hydrocarbon	X
16	16.8	Unidentified hydrocarbon	Hydrocarbon	X
17	18.1	Unidentified hydrocarbon	Hydrocarbon	X
18	18.3	Unidentified hydrocarbon	Hydrocarbon	X
19	18.7	Unidentified hydrocarbon	Hydrocarbon	X
20	19.07	Unidentified hydrocarbon	Hydrocarbon	X
21	19.24	Unidentified hydrocarbon	Hydrocarbon	X
22	21.03	Unidentified hydrocarbon	Hydrocarbon	X
23	21.82	Cholesterol	Sterol		X
24	22.02	Unidentified hydrocarbon	Hydrocarbon	X	X

Figure 2. Chemical profiles of C. haematodes male (above) vs C. cinnaberinus male (below).