A new species of Lynceus Müller, 1776 from New Caledonia (Crustacea: Branchiopoda: Laevicaudata) from dolines, with remarks on zoogeography

Abstract

Abstract.A new species of laevicaudatan branchiopod, Lynceus insularis sp. nov., is described. It is reported from five sinkholes (dolines) in the southern part of New Caledonia. Lynceus insularis sp. nov. is closest to Lynceus species from Australia, but can be separated from these on the basis of clasper morphology and the form of the lamina abdominalis. Lynceus insularis sp. nov. is the first record of a remote insular endemic laevicaudatan. The habitats of the species may be threatened due to hydrological changes, reduction of water supply, acidification of fresh water, invasive species, and/or mining activities in the vicinity.

A revision of the genus Disparalona (Cladocera, Chydorinae) in South America

“…Alona is a genus of another subfamily. Phrixura is an invalid taxon according to the International Commission of Zoological Nomenclature (ICNZ) and Lynceus Müller, 1776 is a genus of Laevicaudata Linder, 1845 branchiopod (Olesen et al 2016). Among all genera cited by Fryer (1968), Alonella presents more superficial morphological similarities to Disparalona (Frey 1959(Frey , 1961.…”

A new Northeast Asian Lynceus (Crustacea: Branchiopoda: Laevicaudata) with uniquely modified thoracopods and an evaluation of DNA barcoding for clam shrimp species identification

“…Thoracopod II (Fig. 8C): not modified, typical for genus (see Olesen et al, 2016;Sigvardt et al, 2019) however, endite 2 and 3 elongate rounded and epipod relatively long.…”

“…3B, 5A, I, J). 12 pairs, serially similar, unmodified, claspers absent; typical for genus (see Olesen et al, 2016;Sigvardt et al, 2019). Thoracopods IX and X with exopods distally modified into curved lobes, dorsally with minute setae clustering together in groups of ~4, apex with tuft of setose setae used to attach egg clutches.…”

“…Despite being globally distributed, the seasonally astatic nature of their freshwater habitat makes the group challenging to study because collecting fresh material is difficult. A few key authors have revised and described most Laevicaudata taxa (Daday, 1927;Martin and Belk, 1988;Timms, 2013), and minor revisions and single species descriptions have been produced in the last few years (Pessacq et al, 2011;Olesen et al, 2016;Sigvardt et al, 2019;Shu et al, 2019), including a catalogue summarizing current taxonomy (Rogers and Olesen, 2016). Lynceus species are morphologically similar but can typically be distinguished by a combination of characters including: male and female rostrum, male claspers (first pair of modified thoracopods), and female laminae abdominalis (lamellae used to support egg clutches).…”

Keys to the Australian clam shrimps (Crustacea: Branchiopoda: Laevicaudata, Spinicaudata, Cyclestherida)

“…A key to these six species is available in Timms 2013. Recently a new species with Australian affinities was described from nearby New Caledonia (Olesen et al, 2016).…”