A new Ingolfiellid (Crustacea, Amphipoda, Ingolfiellidae) from an anchialine pool on Abd al Kuri Island, Socotra Archipelago, Yemen

Abstract

Ingolfiella arganoi sp. n. from Abd al Kuri Island in the Arabian Sea is described from two specimens, a male and a female. The western shore of the Indian Ocean was hitherto a vacant spot in the distribution of circumtropical shallow marine interstitial ingolfiellids and therefore the location of the new species fills a meaningful gap in the geography of the family. Morphologically, the new species shows close affinities with Ingolfiella xarifae from the Maldives.

Microcharon quilli, a new asellote isopod crustacean from interstitial spaces in shallow coralline sands off St. Eustatius, Caribbean Netherlands

“…However, where Microcharon has its main species radiation in continental groundwater (Coineau and Botosaneanu 1973), and but a few species present in the littoral fringe, the ingolfiellid amphipods occur mainly in marine environments (Rubal and Larsen 2012;Vonk and Jaume 2014a, b) and also in deep oceanic seafloor habitats, with freshwater representatives in near-coastal continental groundwater (Ruffo and Vonk. 2001) and brackish water inhabitants in anchialine pools (Vonk and Iannilli 2013). As isopods are supposed to be much older (Carboniferous) than amphipods (Late Eocene), according to their fossil record (Schram 1986;Weitschat and Wichard 2010), the differences in distribution may reflect how the typical and vertically restricted habitat type of the shallow marine interstitial is shared by crustaceans with origins of different stages in the Earth's history in that particular ecological niche.…”

A new genus and species of Ingolfiellidae (Crustacea, Ingolfiellida) from the hyporheic zone in the Sierra de la Ventana, and its biogeographic relevance

“…sp., are: the presence of a terminal structure of unknown function at the end of the flagellum of both antennae and at the accessory flagellum of antenna 1. In some species, like I. alba and I. arganoi, the authors (Iannilli et al 2008;Iannilli & Vonk 2013) describe this structure on the last article of the flagellum of antenna 2 as an aesthetasc. The new taxon here described has mandibles with molar processes vestigial and serrated on one side, spine rows with two bladelike and plumose spines.…”