第20届国际介形类大会1号通知（First Circular of ISO 20） 

国际介形类大会第一次落地中国，将于2026年8月17-21日在北京举行

Ostracoda, belonging to the subphylum Crustacea of the phylum Arthropoda, thrive in a wide range of modern aquatic environments. With a long evolutionary history extending from the Ordovician to the present and exceptionally rich modern and fossil records, they serve as an important archive for studies of biological evolution, environmental and climatic change. The first International Ostracod Symposium was held in 1963, and the meeting has since convened every four years, with 19 editions successfully organized to date. The 20th International Symposium on Ostracoda (20th ISO) will be held in Beijing, China, from August 17^th to 21^st, 2026.

The habitable Earth and its evolutionary history are major scientific issues of common concern in the fields of Earth science and life science. Ostracoda is the most widely distributed biological group with calcareous shells on earth, playing an irreplaceable role in revealing the evolution of the Earth’s ecosystem in modern and geological history. The theme of the ISO 20 is “Ostracoda: A key of the habitable Earth”.

We cordially welcome scientists and researchers worldwide working on ostracods to join this prestigious gathering.

General information

Congress dates: August 17^th-21^th, 2026

Congress location: Beijing, China

Contact: iso20th@163.com

Organizing Committee Chairs: Dangpeng Xi and Yaqiong Wang

Congress Schedule

Summary of deadlines

November 28^th 2025 First Circular–Pre-registration form, suggestions for workshops.

January 15^th 2026 Second Circular–Symposium and field-trip(s) registrations, opening of abstract submission.

March 31^st 2026 Deadline for abstract submission.

April 30^th 2026 Decisions on abstracts and deadline for payment of reduced fees for symposium and field-trip(s).

July 5^th 2026 Third Circular–Full program of the Symposium and field trips.

December 31^st 2026 Deadline for submission of the manuscript for the conference proceedings.

For additional details regarding field, accommodation and dining arrangements, registration fees, and other logistical information, please refer to the attached document “ISO20- First Circular”.

附件：

ISO20-First Circular.

pdfISO20-pre-registration.pdf