Redescription of \u3ci\u3eDeltamysis holmquistae\u3c/i\u3e Bowman & Orsi, 1992 (Crustacean: Mysida: Mysidae), a Mysid Species New to the Atlantic Ocean With Observations On the Taxonomic Status of \u3ci\u3eKochymysis\u3c/i\u3e Panampunnayil & Biju, 2007

The first occurrences of the estuarine mysid Deltamysis holmquistae Bowman & Orsi from the Atlantic Ocean are documented from sites on the eastern Florida and northwest Gulf of Mexico (Texas) coasts of North America. Based on examination of type material and specimens from Florida and Texas, considerable morphological variability and additional characters were observed necessitating a rediagnosis of the monotypic genus Deltamysis and a redescription of D. holmquistae. As a result of these new taxonomic criteria, the Indian Ocean species, Kochimysis pillaii Panampunnayil & Biju, described from southwest coastal India, is subsumed as a junior synonym of D. holmquistae. The current distribution of this apparently invasive species is probably due to maritime commerce. The geographical location of the endemic or source populations of D. holmquistae remains undetermined; however, its co-occurrence in California with three introduced Asian mysids suggests a northern Indian Ocean or northwest Pacific origin

Deltamysis Bowman & Orsi 1992

Genus <i>Deltamysis</i> Bowman & Orsi, 1992 <p> <b>Synonym:</b> <i>Kochimysis</i> Panampunnayil & Biju, 2007</p> <p> <b>Emended diagnosis</b> (Based on adult <i>D. holmquistae</i> paratypes and western Atlantic material): Carapace with anterior margin produced into a short, rounded rostrum. Male antennular peduncle, article 3 with reduced, rounded, sometimes indistinct, setiferous lobe. Antennal scale with transverse suture, separating short distal article. Thoracic endopod 2 with carpus and propodus simple in female; with papillations on lateral margins in male. Thoracic endopod 3 not stouter than other thoracic endopods. Thoracic endopods 3 and 4 with carpopropodus divided into 3 subarticles. Thoracic endopods 5–8 with carpopropodus divided into 4 subarticles. Pleopods rudimentary in both sexes. Uropodal endopod without spiniform setae along medial margin in region of statocyst. Penis of moderate size, extending forward to bases of thoracopods 4–5. Telson entire, lateral margins armed along posterior 0.25–0.37 length with 6–9 spiniform setae per margin (including apical setae); apex with 2 pairs of spiniform setae, inner pair 0.25–0.50 times as long as outer pair.</p> <p> <b>Remarks:</b> We compared our morphological observations on the paratypes of <i>D. holmquistae</i> from northeastern Pacific (California) and northwest Atlantic specimens (Florida and Texas) examined during the present study with the specific description of <i>K. pillaii</i> from the northern Indian Ocean. There was a significant degree of intraspecific morphological variation observed within the type series of <i>D. holmquistae</i>, as well as, in specimens from the northwest Atlantic (see Table 1). These observations demonstrated a high degree of overlap for the characters used in the generic and specific designations for <i>K. pillaii</i> and these findings strongly indicate that the two taxa represent a single variable and geographically dispersed species (see Discussion). Based on these comparisons and the morphological similarities, we herein formally subsume the monotypic genus <i>Kochimysis</i> Panampunnayil & Biju, 2007, as a junior subjective synonym of <i>Deltamysis</i> Bowman & Orsi, 1992.</p>Published as part of <i>Scripter, Matthew J., Price, W. Wayne & Heard, Richard W., 2020, Redescription of Deltamysis holmquistae Bowman & Orsi, 1992 (Crustacea Mysida: Mysidae), a mysid species new to the Atlantic Ocean with observations on the taxonomic status of Kochimysis Panampunnayil & Biju, 2007, pp. 501-518 in Zootaxa 4729 (4)</i> on page 504, DOI: 10.11646/zootaxa.4729.4.3, <a href="http://zenodo.org/record/3753414">http://zenodo.org/record/3753414</a&gt

<p><strong>Redescription of <em>Deltamysis</em> <em>holmquistae</em> Bowman & Orsi, 1992 (Crustacea: Mysida: Mysidae), a mysid species new to the Atlantic Ocean with observations on the taxonomic status of <em>Kochimysis</em> Panampunnayil & Biju, 2007</strong></p>

The first occurrences of the estuarine mysid Deltamysis holmquistae Bowman &amp; Orsi from the Atlantic Ocean are documented from sites on the eastern Florida and northwest Gulf of Mexico (Texas) coasts of North America. Based on examination of type material and specimens from Florida and Texas, considerable morphological variability and additional characters were observed necessitating a rediagnosis of the monotypic genus Deltamysis and a redescription of D. holmquistae. As a result of these new taxonomic criteria, the Indian Ocean species, Kochimysis pillaii Panampunnayil &amp; Biju, described from southwest coastal India, is subsumed as a junior synonym of D. holmquistae. The current distribution of this apparently invasive species is probably due to maritime commerce. The geographical location of the endemic or source populations of D. holmquistae remains undetermined; however, its co-occurrence in California with three introduced Asian mysids suggests a northern Indian Ocean or northwest Pacific origin. </jats:p

Hydrologic characteristics of selected alluvial aquifers in the North Platte Natural Resources District, western Nebraska /

Shipping list no.: 2002-0131-P.Includes bibliographical references (p. 23-24).Mode of access: Internet