Abstract
Tisbe furcata (Baird, 1837) is redescribed in particular detail from a laboratory stock raised from individuals collected from the rocky intertidal of Helgoland (North Sea). This detailed description has revealed the following new characters: labrum rectangular caudally with about 20 dentiform spinules; mandibular exopodite with two aesthetasc-like bluntshaped setae, its endopodite with three groups of three setae each which are confluent at their bases, segment III P 1 endopodite with an outer spinule row on anterior face (instead of a spine-like seta) and a tube-pore subterminally; P2-4 endopodite and exopodite inner setae ringed in distal portion; inner two setae of P 5 baseoendopodite with common base; terminal seta of male P 5 spiniform with a weakly chitinized distal third and a terminal spinule. A phylogenetic evaluation confirms the T. holotburiae-group and T. gracilis-sroup of species defined by Volkmann-Rocco (1973 a and 1972 b respecively) and reveals T. furcata as belonging to the sister-group of these latter two groups together. A new group, the T. furcata-group of species, is proposed comprising the following species: T, furcata, T. celata, T. variana, T. ianthina, T. carolinensis, T. bocqueti, T. lagunaris, T. bulbisetosa.
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