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2024
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| Online Access: | https://doi.org/10.5281/zenodo.10988710 |
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| author | Olesen, Jørgen Grygier, Mark J. |
| author_facet | Olesen, Jørgen Grygier, Mark J. |
| contents | <p>Y-nauplius <b>Type N*</b></p><p>Figs 2, 17F–I</p><p>Type N* – Dreyer <i>et al.</i> 2023a: figs 3, 5a, c, tables s1–s2.</p><p><b>Material examined</b></p><p>JAPAN – <b>Okinawa, Sesoko I., laboratory pier, 26°38ʹ09.4ʺ N, 127°51ʹ55.2ʺ E</b> • 1 LSN; 1991–2005 • 19 LSN, 8 of which molted to cyprids; 2018–2019 (Tables 1 and S1).</p><p><b>Description</b></p><p>LAST-STAGE NAUPLIUS (LSN). Lecithotrophic. Body ovate in dorso-ventral view; about 1.6 times as long as wide; lateral margins with only little discontinuity in body outline between cephalic shield and trunk. In lateral view, trunk axis downturned 45° with respect to cephalic axis. Length 220–240 µm (without dorso-caudal spine), greatest width ca 150 µm, greatest dorso-ventral thickness ca 70 µm. Labrum produced as sub-trapezoidal elevation; surface divided into facets by cuticular ridges; pores not examined in detail but at least with one pore in posterior half of midline and additional pair of pores in postero-lateral corners. Caudal end nearly acute, terminating in ca 20 µm long, robust, conical dorso-caudal spine, axis of which upturned 25° with respect to trunk axis, and pair of triangular furcal spines ca 5 µm long.</p><p>CYPRID VIEWED THROUGH CUTICLE OF LSN. Body generally transparent but many specimens with brown telson. Cephalic shield typically with 2–3 pairs of transparent lipid vesicles along lateral margins and 1–2 smaller pairs along frontal margin. Telson triangular, approximately as long as wide, about half as long as thorax.</p><p><b>Identification and variation</b></p><p>Recognizable by the combination of its ovate/triangular shape in ventral view, degree of bending between cephalon and trunk (bent more than Type O*) and robust, conical dorso-caudal spine. Variation was noted in developing cyprids; a few lack brown coloration of the telson or have fewer vesicles than usual along the cephalic margin.</p><p><b>Distribution</b></p><p>Japan (Sesoko Island, Okinawa).</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_10988710 |
| institution | Zenodo |
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| publishDate | 2024 |
| publisher | Zenodo |
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| spellingShingle | Hansenocaris undetermined Olesen, Jørgen Grygier, Mark J. Biodiversity Taxonomy Animalia Arthropoda Maxillopoda Hansenocarididae Hansenocaris Hansenocaris undetermined <p>Y-nauplius <b>Type N*</b></p><p>Figs 2, 17F–I</p><p>Type N* – Dreyer <i>et al.</i> 2023a: figs 3, 5a, c, tables s1–s2.</p><p><b>Material examined</b></p><p>JAPAN – <b>Okinawa, Sesoko I., laboratory pier, 26°38ʹ09.4ʺ N, 127°51ʹ55.2ʺ E</b> • 1 LSN; 1991–2005 • 19 LSN, 8 of which molted to cyprids; 2018–2019 (Tables 1 and S1).</p><p><b>Description</b></p><p>LAST-STAGE NAUPLIUS (LSN). Lecithotrophic. Body ovate in dorso-ventral view; about 1.6 times as long as wide; lateral margins with only little discontinuity in body outline between cephalic shield and trunk. In lateral view, trunk axis downturned 45° with respect to cephalic axis. Length 220–240 µm (without dorso-caudal spine), greatest width ca 150 µm, greatest dorso-ventral thickness ca 70 µm. Labrum produced as sub-trapezoidal elevation; surface divided into facets by cuticular ridges; pores not examined in detail but at least with one pore in posterior half of midline and additional pair of pores in postero-lateral corners. Caudal end nearly acute, terminating in ca 20 µm long, robust, conical dorso-caudal spine, axis of which upturned 25° with respect to trunk axis, and pair of triangular furcal spines ca 5 µm long.</p><p>CYPRID VIEWED THROUGH CUTICLE OF LSN. Body generally transparent but many specimens with brown telson. Cephalic shield typically with 2–3 pairs of transparent lipid vesicles along lateral margins and 1–2 smaller pairs along frontal margin. Telson triangular, approximately as long as wide, about half as long as thorax.</p><p><b>Identification and variation</b></p><p>Recognizable by the combination of its ovate/triangular shape in ventral view, degree of bending between cephalon and trunk (bent more than Type O*) and robust, conical dorso-caudal spine. Variation was noted in developing cyprids; a few lack brown coloration of the telson or have fewer vesicles than usual along the cephalic margin.</p><p><b>Distribution</b></p><p>Japan (Sesoko Island, Okinawa).</p> |
| title | Hansenocaris undetermined |
| topic | Biodiversity Taxonomy Animalia Arthropoda Maxillopoda Hansenocarididae Hansenocaris Hansenocaris undetermined |
| url | https://doi.org/10.5281/zenodo.10988710 |