A newly described bacteria species found more than a decade ago inside the gut of a stick insect housed in the Bohart Museum of Entomology petting zoo, now bears the name of two very surprised UC Davis entomologists.

Meet Chryseobacterium kimseyorum, named for UC Davis distinguished professor Lynn Kimsey, director of the Bohart Museum, and her husband, forensic entomologist Robert "Bob" Kimsey, both of the Department of Entomology and Nematology.

“We've had a few things named after us but never bacteria--that's a first,” said Lynn Kimsey.   

The story begins more than a decade ago when then UC Davis doctoral student Matan Shelomi, now an associate professor of entomology at National Taiwan University, Taiwan, was studying the digestive physiology of the stick and leaf insects, Phasmatodea, for his Ph.D, under the guidance of his major professor, Lynn Kimsey. He isolated and cultured bacteria from the guts and cages of the stick insects. Some of the species seemed new to science, but Shelomi had neither the time nor the resources to prove it then. 

He stored the microbes inside the deep freezers of the Phaff Yeast Culture Collection, UC Davis Department of Food Science and Technology. 

The years slipped by. So did the memory of isolating the bacteria.  Then after becoming a professor himself, his graduate student, Chiao-Jung Han, discovered a new bacteria species inside a beetle. That prompted Shelomi to renew his interest in the microbes from the Bohart Museum. 

"Thankfully, I kept all my notes from graduate school," says Shelomi, "so I was able to check and see which strains I had flagged as possibly new species. When I saw one of them was the same genus as the new microbe found in Taiwan, I realized this was an opportunity to describe them both together." So Shelomi emailed Kyria Boundy-Mills, curator of the Phaff Collection, “who had my old specimen revived and shipped across the Pacific.” 

Analysis confirmed two new species. The result: A research article published April 19 in the International Journal of Systemic and Evolutionary Microbiology. The title:“Chryseobacterium oryctis sp. nov., Isolated from the Gut of the Beetle Oryctes rhinoceros, and Chryseobacterium kimseyorum sp. nov., Isolated from a Stick Insect Rearing Cage.” 

Han named his species after the beetle he found it in. Shelomi named his species (which he found in Eurycantha calcarata, commonly known as the "Giant New Guinea Stick Insect” or “Thorny Devil Stick”) after his former bosses. The suffix -orum in kimseyorum indicates that the name honors both Kimseys. “Officially one cannot name a microbe after more than one person, but there is precedent, so the (journal) editors allowed it. My grad student wanted to name her microbe after her dog, BaBa, but the editors did not allow that. Spoil-sports!” 

The abstract begins: “Two strains of Chryseobacterium identified from different experiments are proposed to represent new species. Strain WLa1L2M3^T was isolated from the digestive tract of an Oryctes rhinoceros beetle larva. Strain 09-1422^T was isolated from a cage housing the stick insect Eurycantha calcarata. Sequence analysis of the 16S rRNA and rpoB genes found both strains to be similar but not identical to other Chryseobacterium species. Whole-genome sequencing suggested the isolates represent new species, with average nucleotide identity values ranging from 74.6 to 80.5?%.” 

Other co-authors are Wen-Ming Chen, Hsin-Kuang Chen, all scientists in Taiwan, and Estelle Mühle and Dominique Clermont, both of France. The Ministry of Science and Technology, Taiwan, funded the research in a grant awarded to Shelomi, the principal investigator. 

Tabatha Yang, education and outreach coordinator of the Bohart Museum, relayed the news to a tour group visiting the insect museum on April 20.  “I just used this story today with a tour group,” she told Shelomi. “I mentioned how your student was denied her dog's name. I love how this ties the Bohart and the Phaff Yeast collection together and then California and Taiwan.” 

 As for the stick insect, “It's pretty aggressive for a walking stick,” Lynn Kimsey said, noting that Andy Engilis, curator of the UC Davis Museum of Wildlife and Fish Biology, told her about his work in Papua New Guinea. “These walking sticks would actually chase rodents out of their burrows and take over the burrows to rest in,” she related. “That's pretty tough for a walking stick.” 

Meanwhile, the Kimseys are enjoying their new namesake. Lynn Kimsey already has seven other species named for her: 

1.  Mystacagenia kimseyae Cambra & Wasbauer 2020 (spider wasp)
2.  Oligoaster kimseyae Soliman 2013 (tiphiid wasp)
3.  Exaerate kimseyae Oliviera 2011 (orchid bee)
4.  Spilomena kimseyae Antropov 1993 (solitary wasp)
5.  Manaos kimseyae Smith (argid sawfly)
6.  Spintharina kimseyae Bohart 1987 (cuckoo wasp)
7.  Neodryinus kimseyae Olmi 1987 (dryinid wasp)

Bob Kimsey has as at least two species named for him: Acordulacera kimseyi Smith, 2010 (sawfly) and Grandiella kimseyi Summers & Schuster (mite). 

Shelomi, a Harvard University graduate who received his doctorate from UC Davis in 2014, served as a National Science Foundation postdoctoral fellow at the Max Planck Institute for Chemical Ecology, Germany for two years before accepting a faculty position in 2017 at National Taiwan University. 

Shelomi returned to UC Davis in 2017 to present a seminar on "Revelations from Phasmatodea Digestive Track Transcriptomics,” to the department.