35 research outputs found
Two new Mediterranean Stenothoe (Crustacea, Amphipoda) from the coast of Israel
Within collections along the Mediterranean coast of Israel, two new species of Stenothoe (Amphipoda) were found. They were found to be living on sand or mud and probably licking the surface of grains
Foreword to the special issue "new frontiers for monitoring European biodiversity: The role and importance of amphipod crustaceans"
[No abstract available
Cryptic species in a well-known habitat: applying taxonomics to the amphipod genus Epimeria (Crustacea, Peracarida)
Taxonomy plays a central role in biological sciences. It provides a communication system for scientists as it aims to enable correct identification of the studied organisms. As a consequence, species descriptions should seek to include as much available information as possible at species level to follow an integrative concept of âtaxonomicsâ. Here, we describe the cryptic species Epimeria frankei sp. nov. from the North Sea, and also redescribe its sister species, Epimeria cornigera. The morphological information obtained is substantiated by DNA barcodes and complete nuclear 18S rRNA gene sequences. In addition, we provide, for the first time, full mitochondrial genome data as part of a metazoan species description for a holotype, as well as the neotype. This study represents the first successful implementation of the recently proposed concept of taxonomics, using data from highthroughput technologies for integrative taxonomic studies, allowing the highest level of confidence for both biodiversity and ecological research
<strong>New or amended data on Mediterranean Amphipoda: genera <em>Dexamine</em>, <em>Ericthonius</em> and <em>Stenothoe</em></strong>
Krapp-Schickel, T. (2013): New or amended data on Mediterranean Amphipoda: genera Dexamine, Ericthonius and Stenothoe. Zootaxa 3613 (2): 125-145, DOI: http://dx.doi.org/10.11646/zootaxa.3613.2.
Ericthonius didymus Krapp-Schickel 2013, sp. n.
<i>Ericthonius didymus</i> sp. n. <p>Fig. 5–8</p> <p> <b>Type material:</b> Holotype male 4.5mm Laguna di Venezia, Malamocco, 1m depth. slide MVCr 7396-7397 (Museum of Verona).</p> <p>Paratype female 6mm, same locality, slide MVCr 7398 (Museum of Verona).</p> <p>Additional material: a rich series in alcohol, in the Verona Museum.</p> <p> <b>Description</b> (difference to <i>E. argenteus</i> in bold letters)</p> <p> Adult males <b>3–4.5mm</b>. <i>Head</i> elongate, lateral cephalic lobes strongly rounded (containing the oval dark eye). Rostrum small, short. <i>Antennae:</i> A1<A2; A1 peduncle art 1 somewhat shorter than the subequal arts 2,3; flagellum with 9 arts. A2: art 2 with short prolongation, art 4 <art 5, flagellum with 7 and more arts.</p> <p> <i>Mouthparts:</i> Labrum (=UL) with acute epistome. Md palp art 2 the longest, art 3 spatulate, molar triturative. Mx1 inner plate triangular with few lateral setae. Mx2 inner plate with mediofacial setae. Labium (=LL) with acute mandibular process. Mxp art 4 (= dactylus) more than half length of art 3 (= propodus).</p> <p> <i>Gnathopods:</i> Cx1 clearly smaller than Cx2; <b>Gn1 basis unexpanded, slender</b>, carpus triangular, propodus about 4/5 of carpus length, widest distally, posterior margin with many small indentations where bundles of setae are inserted. Cx2 broader than deep, with “stridulating” ridges on lower margin. <b>Gn 2</b> basis bottle-shaped, elongate, narrowing proximally; merus posterodistally rounded; carpus about twice as long as wide, anterior margin smoothly convex, posterodistal tip acutely elongated, clearly longer than second tooth of bifurcation (which can be rounded or acute); <b>propodus about twice as long as broad</b> and clearly shorter than carpus, palm straight; dactylus slender, about 3/4 of propodus length, densely beset with long setae, also distally.</p> <p> <i>Peraeopods:</i> P3, 4 basis bottle-shaped rounded, distally widest. Coxae 5, 6 beset with setae, anteriorly rounded, posterior part produced to narrow lobe, inferoposteriorly excavated. <b>P5</b> twisted; <b>basis posterior margin rather straight, posterodistal corner lengthened to narrow lobe defined by semicircular excavation near insertion of ischium.</b> P6, 7 basis rectangular, with rounded posterodistal corner.</p> <p> <i>Uropods:</i> U1,2 peduncle longer than subequal rami; inner ramus inner margin densely beset with short robust setae, outer ramus inner margin finely serrated. U3 ramus less than half length of peduncle.</p> <p> <i>Telson</i> with cuticular hooks.</p> <p>Ovigerous females 3.5– 6mm: Coxae densely beset with setae. Cx2 with stridulating ridges. Gn2 carpus anteriorly about half length of propodus, posteriorly acutely lengthened, length growing with age, tip reaching half of propodus posterior margin in large females. P5 subquadrate, posterodistal corner right-angled, not lengthened to lobe nor excavated.</p> <p>Colour: brownish, with many dark patches.</p> <p> <b>Etymology.</b> This species is very similar to <i>E. argenteus</i> and females are quite difficult to separate; the specific name stresses this fact, using the latizined form of didymos (Greek for twin) as noun in apposition.</p>Published as part of <i>Krapp-Schickel, T., 2013, New or amended data on Mediterranean Amphipoda: genera Dexamine, Ericthonius and Stenothoe, pp. 125-145 in Zootaxa 3613 (2)</i> on pages 131-136, DOI: 10.11646/zootaxa.3613.2.2, <a href="http://zenodo.org/record/5280169">http://zenodo.org/record/5280169</a>
Dexamine Leach 1814
Key to the 4 Mediterranean species of Dexamine: 1. Basis of P7 linear, propodus of Gn 1 male with a deep sinus in the anterior margin... Dexamine thea Boeck, 1861 (3â4 mm) - Basis of P7 expanded, Gn 2 male propodus without sinus...................................................... 2 2. Pleon segment 3 dorsally tridentate............................... Dexamine spiniventris (A. Costa, 1853) (5â9 mm) - Pleon segment 3 dorsally unidentate....................................................................... 3 3. Coxae distally and facially setose; P6 basis hind margin straight....................... Dexamine filiola sp.n. (3â6 mm) - Coxae distally naked or with rare setae; P6 basis hind margin excavated...... Dexamine spinosa (Montagu, 1813) (9â12mm)Published as part of Krapp-Schickel, T., 2013, New or amended data on Mediterranean Amphipoda: genera Dexamine, Ericthonius and Stenothoe, pp. 125-145 in Zootaxa 3613 (2) on pages 130-131, DOI: 10.11646/zootaxa.3613.2.2, http://zenodo.org/record/528016
Stenothoe dollfusi Chevreux 1887
<i>Stenothoe dollfusi</i> Chevreux, 1887 <p>Fig. 10</p> <p>Chevreux, 1887: 327, p. XXXIII, fig. 8; 1891: 260, fig. 6–8, 10 (not fig. 9); 1900: 53, pl. 8, fig. 1; Chevreux & Fage, 1925:135, fig. 134: all but Gn 2 male</p> <p>Krapp-Schickel, 1976: 12, fig. 11–13 (fig. 13 not Gn 2 male); 1993: 697 fig. 477: all but Gn 2 male</p> <p> Chevreux, 1891 illustrated in his original description (as well as the following ones in 1900 and Chevreux & Fage, 1925) not only the male of his new species <i>St. dollfusi</i> (in fig. 6), but additionally also of the much later described <i>St. eduardi</i> Krapp-Schickel, 1976 (in Chevreux 1887 fig. 9), causing the repetition of this confusion even in the same paper Krapp-Schickel 1976: 12, fig. 13 as well as in Krapp-Schickel 1993: 697, fig.477. Of course the allometry of Gn2 propodus could have led to a longer size and slimmer width, but the very typical semicircular excavation, shown in fig. 6, is totally lost in his fig. 9, which he does not discuss.</p> <p>Fact is, that both sexes have quite similar second gnathopods with the typical excavation, which is shallow in juveniles.</p> <p>Here finally the correction of this more than 100 years old mistake.</p>Published as part of <i>Krapp-Schickel, T., 2013, New or amended data on Mediterranean Amphipoda: genera Dexamine, Ericthonius and Stenothoe, pp. 125-145 in Zootaxa 3613 (2)</i> on page 139, DOI: 10.11646/zootaxa.3613.2.2, <a href="http://zenodo.org/record/5280169">http://zenodo.org/record/5280169</a>