Rhizotrichidae Por, 1986 (Copepoda: Harpacticoida) of Madeira and Porto Santo: description of two new species of the gen
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ORIGINAL PAPER
Rhizotrichidae Por, 1986 (Copepoda: Harpacticoida) of Madeira and Porto Santo: description of two new species of the genus Tryphoema Monard, 1926 Jana Packmor
Received: 1 March 2013 / Revised: 26 April 2013 / Accepted: 14 May 2013 # Senckenberg Gesellschaft für Naturforschung and Springer-Verlag Berlin Heidelberg 2013
Abstract Two new species of the genus Tryphoema Monard, 1926 (Copepoda: Harpacticoida: Rhizotrichidae) are described from sandy sediments in coastal shallow waters of the islands Madeira and Porto Santo. Tryphoema werneri sp. nov. occurs on both islands, while Tryphoema irmgardae sp. nov. was solely found on Madeira. Tryphoema werneri sp. nov. displays one-segmented exopods at the swimming legs 2–4, which are two-segmented in congeners. Tryphoema irmgardae sp. nov. retains four setae on the endopods of the swimming legs 2–4 while all other representatives of the genus display at most 3 setae. Both species differ from each other in many morphological characters especially concerning the armature of the swimming legs 1–4 and their exopodal segmentation, the length of the furcal setae and the ornamentation of the maxilliped. By contrast, some synapomorphies between Tryphoema irmgardae sp. nov. and Tryphoema porca Monard, 1926 (known from shallow waters of the Mediterranean and the English Channel) have been identified and are discussed. Furthermore, a revised key to the species of the genus Tryphoema is provided. Keywords Meiofauna . Shallow water . Morphological taxonomy . Tryphoema irmgardae sp. nov. . Tryphoema werneri sp. nov.
Introduction The genus Tryphoema Monard, 1926 was established based on the type species Tryphoema porca Monard, 1926, which had been found in the Mediterranean Sea (coast of France J. Packmor (*) Senckenberg am Meer, DZMB – Deutsches Zentrum für Marine Biodiversitätsforschung, Südstrand 44, 26382 Wilhelmshaven, Germany e-mail: [email protected]
(Monard 1926, 1928); coast of Algeria (Monard 1937)), and in coastal waters of the English Channel (coast of France (Monard 1935); estuary of the River Exe (Wells 1963)). Monard (1926) placed Tryphoema within the taxon Cletodidae T. Scott, 1905, close to the genus Rhizothrix Sars, 1909. Pennak (1942) established the genus Adelopoda Pennak, 1942 based on the type species Tryphoema (Adelopoda) ramabula (Pennak, 1942) and positioned the genus within the Canthocamptidae Sars, 1906. However, Božić (1953) considered Adelopoda as a subgenus of Rhizothrix while Wells (1963) considered it to be synonymous with Tryphoema and placed Tryphoema as a subgenus within Rhizothrix. Lang (1965) recognised the genera Tryphoema and Rhizothrix as distinct. Por (1986) finally established the family Rhizotrichidae Por, 1986 comprising these two genera. Currently, the genus Tryphoema includes 6 species (Wells 2007), the type species Tryphoema porca, Tryphoema ramabula (Pennak, 1942), which was found at the northeast coast of the United States, Tryphoema bocqueti (Božić, 1953), which is known from the north and south coast of France (Bož
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