The larval development of the spider crab Menaethius monoceros (Latreille, 1825) (Crustacea: Deca... more The larval development of the spider crab Menaethius monoceros (Latreille, 1825) (Crustacea: Decapoda: Brachyura: Majoidea: Epialtinae) is described and illustrated from laboratory-reared larvae. The development consisted of two zoeal stages and one megalopa, following the typical pattern in Majoidea. The duration of the first zoeal stage was 4-11 days, the second zoea appearing 5-12 days and the megalopa 10-18 days after hatching. Both zoeal stages of Menaethius monoceros have a distinct setation on the distal segment of the endopod of maxilliped II. In the megalopa only the setation of the exopod of the antennule is diagnostic among Epialtinae. Comparative analysis revealed that some of the previous descriptions are probably not those of Menaethius monoceros. Based on existing limited information no single morphological feature, or set of features, is apparent that characterizes epialtine larvae.
A new species of Ophryotrocha was discovered on whalebones in Greenland (120 m depth) and at finf... more A new species of Ophryotrocha was discovered on whalebones in Greenland (120 m depth) and at finfish aquaculture sites in Newfoundland (30-70 m depth), where it is considered to be a bioindicator of aquaculture-related organic enrichment. Phylogenetic analyses based on three genes (COI, 16S mitochondrial and H3 nuclear genes) show close affinities with O. lobifera and O. craigsmithi, two species also found on both whalebones and at aquaculture sites (North Sea), and with O. shieldsi from aquaculture sites in Tasmania. The new species is named Ophryotrocha cyclops sp. nov. due to the juxtaposed, quasi-fused central eyes that give the impression of a single eye in live specimens.
The larval development of the spider crab Menaethius monoceros (Latreille, 1825) (Crustacea: Deca... more The larval development of the spider crab Menaethius monoceros (Latreille, 1825) (Crustacea: Decapoda: Brachyura: Majoidea: Epialtinae) is described and illustrated from laboratory-reared larvae. The development consisted of two zoeal stages and one megalopa, following the typical pattern in Majoidea. The duration of the first zoeal stage was 4-11 days, the second zoea appearing 5-12 days and the megalopa 10-18 days after hatching. Both zoeal stages of Menaethius monoceros have a distinct setation on the distal segment of the endopod of maxilliped II. In the megalopa only the setation of the exopod of the antennule is diagnostic among Epialtinae. Comparative analysis revealed that some of the previous descriptions are probably not those of Menaethius monoceros. Based on existing limited information no single morphological feature, or set of features, is apparent that characterizes epialtine larvae.
A new species of Ophryotrocha was discovered on whalebones in Greenland (120 m depth) and at finf... more A new species of Ophryotrocha was discovered on whalebones in Greenland (120 m depth) and at finfish aquaculture sites in Newfoundland (30-70 m depth), where it is considered to be a bioindicator of aquaculture-related organic enrichment. Phylogenetic analyses based on three genes (COI, 16S mitochondrial and H3 nuclear genes) show close affinities with O. lobifera and O. craigsmithi, two species also found on both whalebones and at aquaculture sites (North Sea), and with O. shieldsi from aquaculture sites in Tasmania. The new species is named Ophryotrocha cyclops sp. nov. due to the juxtaposed, quasi-fused central eyes that give the impression of a single eye in live specimens.
Uploads
Papers by Gerhard Pohle