# New Insights into Diversity of Myanmarinidae (Hyenoptera: Apocrita), with Description of Two New Species from Mid-Cretaceous Myanmar Amber

## TL;DR

Two new species of an extinct wasp family from mid-Cretaceous Myanmar amber are described, highlighting their unique features and diversity.

## Contribution

Description of two new species in Myanmarinidae with detailed morphological comparisons and updated species key.

## Key findings

- Myanmarina simplex sp. nov. is characterized by a small head and 13-segmented antennae.
- Myanmarina grandis sp. nov. has a large head and 11-segmented antennae with distinct tibial features.
- The study reveals high species-level diversity within the Myanmarinidae family.

## Abstract

Hymenoptera are well represented in the fossil record, particularly in the mid-Cretaceous amber from northern Myanmar, representing a geographic isolation and endemism. Two new fossil taxa of the extinct family Myanmarinidae, Myanmarina simplex sp. nov. and M. grandis sp. nov., are described and illustrated from mid-Cretaceous Kachin amber. The notable endemic characters revealed are summarized for comparison; they also suggest the high species-level diversity of Myanmarinidae.

Two new species assigned to the genus Myanmarina of the family Myanmarinidae are described and figured from male specimens preserved in Upper Cretaceous ambers from the Hukawng Valley of northern Myanmar. Myanmarina simplex sp. nov. can be distinguished by a small head, 13-segmented antennae, the first flagellomere equal to the second one in length and protibiae with a bifurcated spur. Myanmarina grandis sp. nov. is established based on a large head, 11-segmented antennae, the first flagellomere shorter than the second one and all tibiae with a spur and dorso-apical tooth. In addition, the key to known species of Myanmarina was updated.