The biggest and smallest in different families.
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Polyderus or Gehringia are smallest carabid, and either Mouhotia or Hyperion the largest.
Polyderus and Hyperion are from Australia.
(Kippling Will)

I have seen Cyrtinus beckeri, Cyrtinus sp. indet (from Ecuador), Amphicnaeia sp. indet. from Ecuador and Sarillus pymaeus all at between 2.5 and 3 mm in length.

Species in several different genera may vie for the title of "world's smallest cerambycid beetle", and measurements cited in literature may not be completely accurate, nor comparable, but recent publications have consistently used millimeters as the scale of measurement, so these may be evaluated as follows: Zayas (1975. Revisión de la Família Cerambycidae. La Habana. Acad. Cienc. Cuba, 443 pp., 38 pls) gives 2.75 mm as the lower size limit for two species, Cupeyalia subterranea and Zaplous baracuteyi; Breuning ( 1971. Revision des espèces américaines de la tribue des Apomecynini Lac. Entomol. Abh. St. Mus. Tierk., Dresden, 37(3):209-335, 21 figs.) gives "2 1/2 mm" as the smallest size for both Amphicnaeia pusilla and Acestrilla minima; Linsley & Chemsak (1995. The Cerambycidae of North America, Part VII, No. 2. Taxonomy and Classification of the Subfamily Lamiinae, Tribes Acanthocinini through Hemilophini. Univ. Calif. Publ. Entomol., Berkeley, 114: xi + 292 pp., 55 figs.) cite the lower size limit for both Cyrtinus beckeri and C. pygmaeus as being 2.3 mm overall length. However, Chalumeau & Touroult (2005. Les longicornes des Petites Antilles, taxonomie, éthologie, biogéographie. Series Faunistica No. 51, Pensoft Publ., Bulgaria. 241 pp., XVIII b&w illus., 132 figs.) give the size limits for Decarthria stephensii and D. albofasciata as "1,5 - 2 mm" and "1,7 - 2,25 mm" respectively, indicating that neither of these ant-mimicking species attains the length of the smallest measured specimen of any other described species. These, then, would appear to be the smallest recorded specimens of New World Cerambycidae. Note that these are all Lamiinae. The smallest species of several genera (Obrium, Methia, Hovorea, Euderces) may be less than 4 mm in length, but I have found nothing which approaches the sub-2 mm standard attributed to Decarthria.
I cannot personally verify the accuracy of any of the published measurements, but I think that we can assume that recent papers have been carefully prepared in this regard. This brief summary does not include any Old World taxa, many of which are quite small, perhaps 1.5 mm or less.

(Frank Hovore)

We have collected a Cerambycidae in Paraguay, probably of the genera Eupogonius ? (of 2,5 mm) but we don't know if it is among the smallest Cerambycidae, greetings Carlos

The smallest Cerambycid in my collection ist Decarthria stephensi Hope,1834 from Guadeloupe (described from St. Vincent). My specimens are 2 mm in body lenght. According to A. Villiers 1980, Ann. Soc. ent. Fr. 16 : 589 it goes down to 1,5 mm.
It belongs to the Tribe Cyrtinini of Lamiinae. I think there are not many Cermbycids smaller than this.
Wolfgang Schiller

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