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Issue: Vol. 5296 No. 3: 29 May 2023
Type: Article
Published: 2023-05-29
DOI: 10.11646/zootaxa.5296.3.6
Page range: 421-445
Abstract views: 356
PDF downloaded: 23

An unexpected diversity of Cyphophthalmi (Arachnida: Opiliones) in Upper Cretaceous Burmese amber

Freie Universität Berlin; Institute of Geological Sciences; Palaeontology Section; Malteserstraße 74-100; D-12249 Berlin; Germany
Museum für Naturkunde; Leibniz Institute for Evolution and Biodiversity Science; Invalidenstraße 43; D-10115 Berlin; Germany
Museum of Comparative Zoology and Department of Organismic and Evolutionary Biology; Harvard University; 26 Oxford Street; Cambridge; MA 02138; USA
Opiliones Biogeography Cenomanian fossils Stylocellidae

Abstract

Ten new Cyphophthalmi specimens (Arachnida: Opiliones) from the Upper Cretaceous (Lower Cenomanian) Burmese amber of northern Myanmar are described. Seven of these are placed in Stylocellidae, the predominant extant family found today in Southeast Asia. Sirocellus iunctus gen. et sp. nov. represents the first fossil with a combination of sironid and stylocellid characters, suggesting a still ongoing transition in some lineages during the Upper Cretaceous. Mesopsalis oblongus gen. et sp. nov. represents a second fossil with elongated ozophores, a character not known from modern species. Leptopsalis breyeri sp. nov. is the first Cretaceous cyphophthalmid assignable to an extant genus. The species Foveacorpus cretaceus gen. et sp. nov. and F. parvus gen. et sp. nov., which cannot be placed in an extant family, show morphological novelties for Cyphophthalmi such as numerous pits covering the whole body. The possible function of these pits is discussed. Three more adult males with unique adenostyles and two juveniles are not formally named but further indicate an already highly diverse cyphophthalmid fauna during the Cretaceous. The total number of named Burmese amber Cyphophthalmi species is raised from one to six, and the total fossil record for this suborder now stands at eight.

 

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