Passalidae

{{Short description|Family of beetles}}

{{Automatic taxobox

| image = Beetle-Bessbug.jpg

| image_caption = Adult Odontotaenius disjunctus

| image2 = Eastern Bess Beetle Larva (14463143929).jpg

| image2_caption = Larva of Odontotaenius disjunctus

| oldest_fossil = Cenomanian

| taxon = Passalidae

| authority = Leach, 1815

| display_parents = 3

| diversity_link =

| diversity = > 500 species

| subdivision_ranks = Genera

| subdivision =

Didimus

Mastochilus

Odontotaenius

Passalus

Pharochilus

Ptichopus

:many more

}}

Passalidae is a family of beetles known variously as "bessbugs",{{cite web |url=http://eny3005.ifas.ufl.edu/lab1/Coleoptera/Passalid.htm |title=Family Identification. Coleoptera: Passalidae |author=John L. Foltz |publisher=University of Florida |date=2001-07-08 |url-status=dead |archive-url=https://web.archive.org/web/20081218143544/http://eny3005.ifas.ufl.edu/lab1/Coleoptera/Passalid.htm |archive-date=2008-12-18 }} "bess beetles", "betsy beetles", "betsy bugs", or "horned passalus beetles". Nearly all of the 500-odd species are tropical; species found in North America are notable for their size, ranging from 20 to 43 mm, for having a single "horn" on the head, and for a form of social behavior unusual among beetles.

Bodies are elongate-cylindrical and black overall; ventral surfaces may be covered with yellow setae. The head is narrower than the thorax, with antennae consisting of 10 antennomeres with a three-segment club. The elytra are elongate with parallel sides, and heavily striated.

They are quasisocial (common nest + brood caring) beetles that live in groups within rotting logs or stumps.{{Cite web|url=http://www.museum.unl.edu/research/entomology/Guide/Scarabaeoidea/Passalidae/Passalidae-Overview/PassalidaeO.html|title=Generic Guide to New World Scarab Beetles-Scarabaeoidea-Passalidae Overview|website=www.museum.unl.edu|access-date=2017-01-22}} The beetles will excavate tunnel systems within rotting wood where the females then lay their eggs.{{Cite news|url=http://insects.about.com/od/beetles/p/Bess-Beetles-Family-Passalidae.htm|title=What Are Bess Beetles?|newspaper=About.com Education|access-date=2017-01-22}} They care for their young by preparing food for them and helping the larvae construct the pupal case. Both adults and larvae must consume adult feces which have been further digested by microflora for a time; an arrangement that might be described as a sort of external rumen.

They are also able to produce fourteen acoustical signals, more than many vertebrates. Adults produce the sounds by rubbing the upper surface of the abdomen against the hind wings. The larvae produce the sounds by rubbing the third leg against a striated area on the coxa of the second leg.

While the taxonomy of Nearctic species is well-known (four species in the US, and 90 in Mexico), bess beetles in other parts of the world need further study.

Of North American species, Odontotaenius disjunctus (synonym: Popilius disjunctus) is the familiar bessbug found throughout the eastern US and Canada, while O. floridanus has only been found in Florida on sand hills that used to be islands when Florida was flooded thousands of years ago. Ptichopus angulatus was recently{{When|date=March 2023}} discovered near the border of Mexico in Arizona. Its habitat is south to Colombia and it is commonly associated with the detritus chambers of leafcutter ant nests (Atta spp.). Two other species were reported from Arizona at the beginning of the 20th century, but have not been seen there since that time; they may have been brought from Mexico by a train hauling firewood.

The oldest records of the family go back to the Cretaceous, with the genus Ceracyclus known from two species found in the Cenomanian aged Burmese amber; the genus appears to be closely related to the living genus Cylindrocaulus.{{Cite book |last=Boucher |first=Stéphane |url=https://www.researchgate.net/publication/320557651 |title=Ceracyclini, tribe nov. of Passalidae Aulacocyclinae for Cylindrocaulus Fairmaire and Ceracyclus, gen. nov., with two new species from the Cenomanian Burmese amber (Coleoptera, Scarabaeoidea) |last2=Bai |first2=Ming |last3=Wang |first3=Bo |last4=Monteuil |first4=Oliver |publisher=Les Cahiers Magellanes |year=2017 |isbn=978-2-35387-135-3 |oclc=1098209160}} The family has been suggested to have a close relationship with the extinct family Passalopalpidae.{{Cite journal|last1=Boucher|first1=Stéphane|last2=Bai|first2=Ming|last3=Wang|first3=Bo|last4=Zhang|first4=Weiwei|last5=Yang|first5=Xingke|date=September 2016|title=†Passalopalpidae, a new family from the Cretaceous Burmese amber, as the possible sister group of Passalidae Leach (Coleoptera: Scarabaeoidea)|url=https://linkinghub.elsevier.com/retrieve/pii/S0195667116300477|journal=Cretaceous Research|language=en|volume=64|pages=67–78|doi=10.1016/j.cretres.2016.03.017|bibcode=2016CrRes..64...67B |url-access=subscription}}