Natatolana caeca

• Main Author: Keable, Stephen J.
• Format: Text
• Language: unknown
• Published: Zenodo 2006
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Cirolanidae; Natatolana; Natatolana caeca; Northeast Atlantic
• Online Access: https://dx.doi.org/10.5281/zenodo.4685507; https://zenodo.org/record/4685507

Natatolana caeca (Dollfus, 1903) Synonymy in Keable & Bruce, 1997: 671, figs. 5–7. Type material . Syntypes: all IOM; 138 specimens, 36 0188, Station 318; 2 specimens, 36 0189, Station 506; 5 specimens, 36 0184, Station 769; 5 specimens, 36 0185, Station 1048; 2 specimens, 36 0186, Station 1.100. All examined. Type locality: all Méditerranée, ( Campagnes de l'Hirondelle et de la Princesse Alice , 38°37'N 13°5'E, 1210 m, [Station 318]; 43°36'N 5°17'E, 1503 m, [Station 506]; 43°28'N 5°25'E, 2368 m, [Station 769]; 41°47'N 4°54'E, 2276 m, [Station 1048]; 43°02'N 6°22'E, 2500 m, [Station 1.100]). Material examined . Listed by Keable & Bruce (1997). Diagnosis . Eyes : absent. Interocular furrow : well developed, forming a ridge that extends across the cephalon; smoothly convex. Frontal lamina : lateral margins straight, narrowing anteriorly. Antenna : c. 0.25× as long as body, reaching to posterior of pereonite 2. Coxal plates : furrows completely absent on all coxae. Pleonite 4 : apex rounded. Pleotelson : broad, length 0.98× basal width; anterodorsal depression absent; anterolateral margins convex; posterolateral margins convex; apex not produced, lateral margins converging smoothly to a point; with 8 RS. Pereopods 1–6 : males with RS on the merus of pereopods 1–3, and carpus of pereopods 4–6, shorter than the propodus. Pereopod 2 : propodus with 2 RS on palm. Pereopod 3 : ischium anterodistal angle produced, but not as produced as on pereopods 1 and 2, similar to pereopod 4. Propodus with 2 RS on palm. Pereopod 7 : basis narrow, width 0.46× length; distance between anterior margin and medial carina less than between posterior margin and medial carina; posterior margin with setae completely absent along entire length. Penes : absent. Pleopod 2 appendix masculina : extending beyond tip of endopod, 1.07× length of endopod; margins very slightly curved laterally; slender; apex not at angle to adjacent margins, bluntly rounded. Uropods : exopod slightly shorter than endopod, 0.81× the length of the endopod. Size . Adults to 15 mm. Remarks . Keable & Bruce (1997) redescribe Natatolana caeca and discuss its identification and character variation. The reduced anterodistal angle of the ischium of pereopod 3 and absence of eyes are particularly useful characters for identifying this species. Distribution . Material recorded by Keable & Bruce (1997) and the records of Hansen (1890) and Monod (1930) are from the northeast Atlantic between c. 18° to 50°N and 6° to 17°W. Only the type material has been recorded from the Mediterranean Sea. Most records are from the vicinity of about 1000 m depth, but the type specimens come from a maximum depth of 2500 m and a reliable minimum depth of 486 m is recorded by Keable & Bruce (1997). : Published as part of Keable, Stephen J., 2006, Taxonomic Revision of Natatolana (Crustacea: Isopoda: Cirolanidae), pp. 133-244 in Records of the Australian Museum 58 (2) on page 164, DOI: 10.3853/j.0067-1975.58.2006.1469, http://zenodo.org/record/4685692 : {"references": ["Dollfus, A., 1903. Note preliminaire sur les especes du genre Cirolana recueillies pendant les campagnes de l'Hirondelle et de la Princesse Alice sous la direction de S. A. S. le Prince Albert Ier, de Monaco. Bulletin de la Societe Zoologique de France 28: 5 - 10.", "Hansen, H. J., 1890. Cirolanidae et familiae nonnulae propinquae Musaei Hauniensis. Det Kongelige Danske Videnskabernes Selskabs Skrifter, Naturvidenskabelig og Mathematisk Afdeling 6 (3): 237 - 426.", "Monod, T., 1930. Contribution a l'etude des Cirolanidae. Annales des Sciences Naturelles Zoologie 13: 129 - 183."]}