Politolana Bruce 1981, sensu

• Main Authors: Frutos, Inmaculada, Sorbe, Jean Claude
• Format: Text
• Language: unknown
• Published: Zenodo 2010
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Malacostraca; Isopoda; Cirolanidae; Politolana; Barents Sea; Hoek; Seta; Hale
• Online Access: https://dx.doi.org/10.5281/zenodo.6210535; https://zenodo.org/record/6210535

Key to the world species of Politolana Bruce 1981 (modified from Riseman & Brusca 2002; completed from data in Riseman et al. 2001) This key considers exclusively species that belong to Politolana sensu stricto (see Riseman & Brusca 2002), characterized by the frontal lamina being narrow and blade-like (length about 4–5 times width) or highly reduced. In the case of P. sanchezi sp. nov. , this key can be used for adult males and females as well as for mancas down to a minimum TL of 5.1 mm. Figure 6 shows the geographical distribution of all known species in this genus, most of them from North America. 1 Pereopod 1 with superior distal angle of merus produced into a small lobe just reaching the base of the propodus and equalling only one-quarter the length of the merus; coxae 4–6 without oblique impressions; cuticular ridge of cephalon frontal margin laterally reaching, but not dividing eyes......................................................................................... 2 - Pereopod 1 with superior distal angle of merus produced into a large recurved lobe reaching beyond the midpoint of the propodus and equalling half the length of the merus; coxae 4–6 with distinct or weak oblique impressions; cuticular ridge of cephalon frontal margin laterally reaching and dividing eyes............................................................... 5 2 Frontal lamina greatly reduced to a small ridge sitting deep between the antennae; ventral margin of eyes with fringe of simple setae; setation of antenna 2 peduncle dense, article 5 with cluster of about 15 stiff simple setae................. ............................................................................................................................................... P. polita (Stimpson 1853) northwestern Atlantic (from Bay of Fundy to about 38 °N), 0–86 m - Frontal lamina narrow, length about 4–5 times width, ventral margin of eyes without fringe of simple setae; antenna 2 peduncle article 5 with cluster of about 6 or fewer stiff simple setae....................................................................... 3 3 Pleotelson posterior margin convex (juveniles) or emarginate (adults); uropod exopod length subequal to endopod length, narrow and rounded in cross section ................................................................ P. concharum (Stimpson 1853) northwestern Atlantic (from Nova Scotia to about 22 °N), 0–317 m - Pleotelson posterior margin evenly convex or narrowly truncate; uropod exopod length shorter than endopod length, flattened with convex lateral margins........................................................................................................................... 4 4 Antennae 2 reaching middle of pereonite 2; pleon epimere flanges with ventral posterior angle produced into a fine point; pleotelson posterior margin evenly convex; pereopod 4 propodus with sparse setae on superior margin.......... .............................................................................................................................. P. impostor Riseman & Brusca 2002 northwestern Atlantic (from Nova Scotia to about 38 °N), 29–587 m - Antennae 2 laterally reaching anterior region of pereonite 1; pleon epimere flanges with ventral posterior angle blunt or rounded; pleotelson posterior margin narrowly truncate; pereopod 4 propodus without setae on superior margin. ..................................................................................................................................... P. microphthalma* (Hoek 1882) northeastern Atlantic (from Barents Sea to northern North Sea), 82–440 m 5 Pereon-pleon articulation tight, with pleonite 1 visible, not completely overlapped by pereonite 7; pleon convex like pereon such that ventral flanges are hidden by epimera; uropod endopod apex subacute, with distomedial margin slightly concave, apex with cluster of long simple setae............................................................................................. 6 - Pereon-pleon articulation loose, with pereonite 7 overhanging and overlapping pleonite 1 and sometimes pleonite 2; pleon more dorsoventrally compressed than pereon such that epimeres are laterally flared and do not hide the ventral flanges; uropod endopod apex broadly rounded or truncate, apex with or without cluster of long simple setae........ 7 6 Body without chromatophores; molar process anterior margin with teeth widely spaced, not touching at their base; apex of uropod endopod with 2 short robust setae; pleotelson posterior margin evenly and narrowly rounded.......................................................................................................................................... P. haneyi Riseman & Brusca 2002 Gulf of California, Gulf of Mexico and Florida, 92–311 m - Body with chromatophores on the cephalon, pereon, pleon and telson; molar process anterior margin with teeth closely spaced, touching at their base; apex of uropod endopod with 1 robust seta; pleotelson broadly convex with small median point.......................................................................................................................... P. sanchezi sp. nov. southern Bay of Biscay and west Galicia, 480–829 m 7 Uropod exopod long, reaching beyond endopod and pleotelson, lateral margins relatively straight, tapering evenly; pereonite 1 anterolateral margin sinuate, forming acute anterior point; pleotelson posterior margin medially produced into acute point; pereopods 5–7 posterior distal margin of ischium with simple acute robust setae; pleopod 1 peduncle width nearly twice length; pleopod 1 endopod width greater than half the width of exopod........................................................................................................................................................................ P. eximia (Hansen 1890) off Brazilian coast**, 50–380 m - Uropod exopod shorter than or subequal to endopod, with lateral margins slightly convex; pereonite 1 anterolateral margin straight, forming rounded or blunt anterior angle; pereopods 5–7 posterior distal margin of ischium with studded-biserrate setae; pleopod 1 peduncle subquadrate, or with length only slightly less than width; pleopod 1 endopod width about one half width of exopod.......................................................................................................... 8 8 Cephalon with additional transverse cuticular ridge present between frontal ridge and the interocular furrow; pereopod 7 coxa with distinct oblique impressions; antenna 2 not reaching pereonite 2; frontal lamina narrow, usually spatulate (anteriorly widened); pleotelson posterior margin with plumose marginal setae and four small robust setae; pereopods 4–7 posterior distal margin of ischium with studded-biserrate setae............................................................ ................................................................................................................ P. tricarinata Riseman, Pires & Brusca 2001 off Brazilian coast**, 15–48 m - Cephalon without transverse cuticular ridge between frontal ridge and the interocular furrow; pereopod 7 coxa with or without residual oblique impressions, never complete and distinct; antenna 2 reaching pereonite 2; frontal lamina narrow with slight hourglass shape or evenly wide; pleotelson posterior margin with plumose marginal setae, with or without minute robust setae; studded-biserrate setae absent on posterior distal margin of pereopod 4 ischium, present on ischium of pereopods 5–7...................................................................................................................................... 9 9 Eyes present, darkly pigmented ........................................................................................... P. impressa (Harger 1883) northwestern Atlantic (from Massachusetts to Florida), NE Gulf of Mexico, 73–700 m - Eyes wanting or greatly reduced......................................................... P. wickstenae Wetzer, Delaney & Brusca 1987 N Gulf of Mexico, 488–600 m : Published as part of Frutos, Inmaculada & Sorbe, Jean Claude, 2010, Politolana sanchezi sp. nov. (Crustacea: Isopoda: Cirolanidae), a new benthic bioturbating scavenger from bathyal soft-bottoms of the southern Bay of Biscay (northeastern Atlantic Ocean), pp. 20-34 in Zootaxa 2640 on pages 28-29, DOI: 10.5281/zenodo.198554 : {"references": ["Bruce, N. L. (1981) Cirolanidae (Crustacea: Isopoda) of Australia: diagnoses of Cirolana Leach, Metacirolana Nierstraz, Neocirolana Hale, Anopsilana Paulian and Debouteville, and three new genera - Natatolana, Politolana and Cartetolana. Australian Journal of Marine and Freshwater Research, 32, 945 - 966.", "Riseman, S. F. & Brusca, R. C. (2002) Taxonomy, phylogeny and biogeography of Politolana Bruce, 1981 (Crustacea: Isopoda: Cirolanidae). Zoological Journal of the Linnean Society, 134, 57 - 140.", "Riseman, S. F., Pires, A. M. & Brusca, R. C. (2001) A new species of Politolana Bruce 1981 (Isopoda: Flabellifera: Cirolanidae) from the south Brazilian shelf. In: B. Kensley & R. C. Brusca (Eds.), Isopods Systematics and Evolution, Crustacean Iss. 13, Balkema, Rotterdam, pp. 57 - 140.", "Hoek, P. P. C. (1882) Die Crustaceen, gesammelt waerhend der Fahrten des \" Willem Barents \" in den Jahren 1878 und 1879. Niederlandisches Archiv Fur Zoologie, Supplement-band 1 (7), 1 - 75.", "Wetzer, R., Delaney, P. M. & Brusca, R. C. (1987) Politolana wickstenae new species, a new cirolanid isopod from the Gulf of Mexico, and a review of the \" Conilera genus-group \" of Bruce (1986). Contributions in Science, Natural History Museum of Los Angeles County, 392, 1 - 10."]}