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BackgroundThe genus    Aegialoalaimus    de Man, 1907 includes 12 nominal species, of which three species are considered valid, two species were transferred to other genera and seven species have uncertain taxonomic status.New informationNew species,    Aegialoalaimus   bratteni    sp. n. was found in Skagerrak off the west coast of Sweden. It is particularly characterized by the 1.5-1.8 mm long body, short papilliform cephalic sensilla, excretory pore opening just posterior to nerve ring level, spicules that are straight in shape, supplements and gubernaculum absent, separating it from other valid species of the genus. It can be further differentiated from    Aegialoalaimus   elegans    in having longer body (1.5-1.8 mm in    A.   bratteni    sp. n.  vs  0.8-1.3 mm in    A.   elegans   ), shape and size of spicules (straight and 22-29 µm long in    A.   bratteni    sp. n.  vs  arcuate and 34 µm long in    A.   elegans   ), absence of precloacal supplements ( vs  seven-eight in    A.   elegans   ), absence of gubernaculum ( vs  present in    A.   elegans   ); from    A.   setosa    in having shorter tail (c´=2.6-3.1 in    A.   bratteni    sp. n.  vs  c´=4.2 in    A.   setosa   ), shorter cephalic sensilla (0.5-1.0 µm in    A.   bratteni    sp. n.  vs  9 µm in    A.   setosa   ), shape and size of spicules (straight and 22-29 µm long in    A.   bratteni    sp. n.  vs  arcuate and 40-45 µm long in    A.   setosa   ), absence of precloacal supplements ( vs  eight in    A.   setosa   ), absence of gubernaculum ( vs  present in    A.   setosa   ); from    A.   leptosoma    in having longer body (1.5-1.8 mm in    A.   bratteni    sp. n.  vs  0.5-0.7 mm in    A.   leptosoma   ) and other measurements, shape of spicules (straight in    A.   bratteni    sp. n.  vs  arcuate in    A.   leptosoma   ), absence of precloacal supplements ( vs  three-five in    A.   leptosoma   ), absence of gubernaculum ( vs  present in    A.   leptosoma   ). Type specimens of    Aegialoalaimus   cylindricauda    Allgén, 1933 and    A.   paratenuicaudatus    Allgén, 1959 are redescribed and taxonomic status of these two species is re-evaluated. A taxonomic review, tabular compendium and identification key for species of the genus    Aegialoalaimus    are also given.

Description of Aegialoalaimus bratteni sp. n. from Skagerrak and a review of the genus ( Aegialoalaimidae , Nematoda incertae sedis)