Brucerolis Poore &amp; Storey 2009, gen. n.
Creators: name: Poore, Gary
name: Storey, Melissa
Publisher: name: Zenodo
Year: 2009
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Serolidae
Brucerolis

description: <i>Brucerolis</i> gen. n. urn:lsid:zoobank.org:act: FC4BEA04-0350-49E1-8FA3-01AF4DBB7186 Type species. <i>Brucerolis nowra</i>, sp. n. here designated. <b>Diagnosis.</b> Body deeply incised between extremely long, attenuating, posteriorly directed coxal and epimeral plates; middorsal line without midposterior processes, not elevated in lateral view, or with short triangular middorsal processes on posterior margin of head, pereonites 2–4 and pleonites 1–3, evident in lateral view. Pereonite 6 to pleonite 1 fused middorsally and midventrally. Eyes contiguous with head margin posteriorly, twice as long as wide, reniform. Coxal dorsal plates 2–4 delimited from tergite by suture; coxal dorsal plates 2–6 with anterior blunt process slotting into groove on preceding coxae, isolating an oval aperture between coxae; coxal plate 5 with an intermediate anterior process meeting a similar posterior process on coxal plate 4, so subdividing intercoxal aperture. Pleotelson with horizontal obscure middorsal keel; dorsal surface with flattened plate-like ridges laterally, with rounded ends. Pereonal sternite 1 with sharp medial ridge anteriorly and saddle posteriorly; ventral coxal plates 2–4 meeting in midline, without pair of contiguous teeth on anteromesial corners of sternites 2, smaller pair on sternites 3; pleonal sternites 1–3 with acute posterior ridged margin. Antenna 2 article 5 about 10 times as long as wide. Mandible, incisor smooth, chitinised, hoof-like; left lacinia mobilis expanded, half as wide as mandibular incisor; right lacinia mobilis diverging, with obsolete apical dentition; spine simple; mandibular palp, article 2 with row of setae confined distally along mesial margin. Maxilla 1 inner lobe a simple expanded plate, outer lobe with ̴11 robust terminal setae. Maxilla 2 inner lobe broad, distally richly setose, middle and lateral lobes each with 2 apical setae. Maxilliped, endite with 2 strong distal robust setae; maxillipedal palp of 3 articles; palp article 2 distally dilated, distomesially lobed, with shallow indentation on mesial margin separating two clusters of setae; epipod more or less semicircular. Pereopod 1, palm of propodus with alternating flagellate cylindrical setae and flagellate plate-like setae. Pereopod 2 of male subchelate; palm of propodus with U-shaped row of robust setae; dactylus with small terminal unguis. Pereopod 7 of male sexually differentiated, propodus broader than in female, with felt of fine scale setae, dactylus simple, curved. Pleopod 4 endopod simply triangular, not bilobed. Uropod biramous, inserting sublaterally at about midpoint of pleotelson. Oostegites of female present on pereopods 1–4. <b>Included species</b> (see too Remarks below). <i>Brucerolis bromleyana</i> (Willemöes-Suhm, 1876) (ex. <i>Serolis</i>) comb. n. – Southern Ocean (Indian Ocean sector), 3614 m depth. <i>B. cidaris</i> (Poore &amp; Brandt, 1997) (ex. <i>Acutiserolis</i>) comb. n. – Coral Sea, 891– 1491 m depth. <i>B. macdonnellae</i> (Menzies, 1962) (ex. <i>Serolis</i> (<i>Serolis</i>)) comb. n. – South Atlantic, 2741 m depth. ? <i>B. maryannae</i> (Menzies, 1962 (ex. <i>Serolis</i> (<i>Serolis</i>)) comb. n. – South Atlantic, 3839 m depth. <i>B. nowra</i> sp. n. – south-eastern Tasman Sea, 450–1750 m depth. <b>Etymology.</b> Named for Niel Bruce, Museum of Tropical Queensland, Townsville, formerly of National Institute of Water and Atmosphere, Wellington, in recognition of his extensive contribution to isopod taxonomy and his friendship. <b>Remarks.</b> <i>Acutiserolis</i> is diagnosed above and <i>Cuspidoserolis</i> is placed in synonymy. <i>Brucerolis</i> differs from <i>Acutiserolis</i> in having the coxal dorsal plates 2–6 interacting only by means of key-like lobes, coxal plate 6 exceeding the pleotelson by at least the pleotelson length, middorsal spines absent or obscure, and the pleotelson lacking ridges and keels. All are clearly distinctive autapomorphies different from <i>Acutiserolis</i> and <i>Cuspidoserolis.</i> Brandt (1988) listed five species and Wägele (1994) seven in <i>Acutiserolis</i>; another has been described since (Poore and Brandt 1997). All except the type species are excluded from <i>Acutiserolis</i> above and are candidates for inclusion in the new genus, <i>Brucerolis</i>. <i>Serolis bromleyana</i> Willemöes-Suhm, 1876 and <i>Acutiserolis cidaris</i> Poore and Brandt, 1997, both illustrated in detail by Poore and Brandt (1997), conform well to the generic definition of <i>Brucerolis</i> and are here transferred to join the type species. The illustrations of <i>Serolis</i> (<i>Serolis</i>) <i>macdonnellae</i> Menzies, 1962 show the coxal keys, pereonite 1 and pleotelson in suffi cient detail to be confident that this too belongs to <i>Brucerolis</i>. <i>Serolis</i> (<i>Serolis</i>) <i>maryannae</i> Menzies, 1962 has the general habitus, pleotelson sculpture, elongate bifid pleonal epimera, and acute coxal dorsal plates of <i>Brucerolis</i> and pereonite 1 like <i>B. bromleyana</i>, but coxal keys were not shown in the illustration. If this is an oversight by Menzies or a juvenile feature, the 18.8-mm female would be the smallest individual of the genus known. Th e species is a possible member of <i>Brucerolis</i>. All others listed previously in <i>Acutiserolis</i> are not. <i>Serolis gracilis</i> Beddard, 1884 and <i>S</i>. <i>neaera</i> Beddard, 1884 are similar to each other (Beddard, 1884b) and superficially to species of <i>Brucerolis</i>, sharing acute tapering coxae, elongate coxa 6, prominent interacting coxal keys and notched article 2 of the maxillipedal palp, but there are several important differences. The anterolateral margin of the head is concave in species of <i>Brucerolis</i>, but in <i>Serolis gracilis</i> and <i>S</i>. <i>neaera</i> the anterior margin of the head is strongly convex and the anterolateral corners of the head extend much further laterally than the eyes. Th e pleotelson of <i>S</i>. <i>gracilis</i> and <i>S</i>. <i>neaera</i> are as in <i>Acanthoserolis</i> Brandt, 1988 (type species: <i>Serolis polaris</i> Richardson, 1911) with a proximal, acute spine middorsally and a median transverse ridge produced into acute spines middorsally and midlaterally, and uropods that insert on the pleotelson terminally and point mesially. We examined <i>S. schythei</i> Lütken, 1858 (included in <i>Acanthoserolis</i> by Brandt and Wägele and similar to <i>S. polaris</i>) from the collections of Museum Victoria. Both species lack elongate coxal plates and share a bilobed endopod on pleopod 4. Beddard’s (1884b) descriptions and figures and our own examination of material of <i>Serolis gracilis</i> and <i>S</i>. <i>neaera</i> demonstrate many differences from <i>Acutiserolis</i>, <i>Brucerolis</i> and <i>Acanthoserolis</i>. <i>Serolis neaera</i> and <i>S</i>. <i>gracilis</i> have a dense mat of plumose setae on the male pereopod 2 whereas the three genera are scarcely setose. Th e endopod of pleopod 4 is bilobed in <i>Serolis paradoxa</i> Fabricius, 1775, <i>Acanthoserolis schythei</i>, <i>A</i>. <i>polaris</i>, <i>Serolis neaera</i> (Nordenstam, 1933) and <i>S</i>. <i>gracilis</i> (Beddard, 1884b), earlier observations confirmed by us. Th e endopod of pleopod 4 is not bilobed in <i>Acutiserolis</i> or <i>Brucerolis</i>. Moreira (1977) discussed the resemblance of his species, <i>S. insignis</i>, included in <i>Acanthoserolis</i> by Wägele (1994), to <i>Serolis gracilis</i>. Th ese two and <i>S. neaera</i> are clearly related but their generic placement remains problematic. <i>Serolis margaretae</i> Menzies, 1962 was included in <i>Acutiserolis</i> by Brandt (1991) and Wägele (1994). We agree with Poore and Brandt’s (1997) conclusion that the very small (8.4 mm and smaller) type specimens without elongate coxal plates and epimera could not be assigned to <i>Acutiserolis</i>. Nor do they conform to <i>Brucerolis</i>. Held’s (Held 2000; Held and Wägele 2000; Held 2001) observations on the relationships of <i>Acutiserolis</i> derived from molecular analyses (using the species <i>A. bromleyana</i>) refer to <i>Brucerolis</i>.
description: Published as part of <i>Poore, Gary &amp; Storey, Melissa, 2009, Brucerolis gen. n., and Acutiserolis Brandt, 1988, deep-water southern genera of isopods (Crustacea, Isopoda, Serolidae), pp. 143-160 in ZooKeys 18 (18)</i> on pages 151-153, DOI: 10.3897/zookeys.18.129, http://zenodo.org/record/576499
description: {"references": ["Willemoes-Suhm Rv (1876) Preliminary report to Professor Wyville Th omson, F. R. S., Director of the Civilian Scientific Staff, on Crustacea observed during the cruise of H. M. S. \" Challenger \" in the Southern Sea. Proceedings of the Royal Society of London 24: 585 - 592.", "Poore GCB, Brandt A (1997) Crustacea Isopoda Serolidae: Acutiserolis cidaris and Caecoserolis novaecaledoniae, two new species from the Coral Sea. In: Crosnier, A. (ed.), Resultats des Campagnes MUSORSTOM, vol. 18. Memoires du Museum National d'Histoire Naturelle, Paris 176: 151 - 168.", "Menzies RJ (1962) Th e isopods of abyssal depths in the Atlantic Ocean. Vema Research Series 1: 79 - 206.", "Brandt A (1988) Antarctic Serolidae and Cirolanidae (Crustacea: Isopoda): new genera, new species, and redescription. Koeltz Scientific Books, Konigstein, 143 pp.", "Wagele J-W (1994) Notes on Antarctic and South American Serolidae (Crustacea, Isopoda) with remarks on the phylogenetic biogeography and a description of new genera. Zoologische Jahrbucher Abteilung fur Systematik 121: 3 - 69.", "Beddard FE (1884 a) Preliminary notice of the Isopoda collected during the voyage of H. M. S. ' Challenger' - Part I. Serolis. Proceedings of the Zoological Society of London 23: 330 - 341.", "Beddard FE (1884 b) Report on the Isopoda collected by H. M. S. Challenger during the years 1873 - 76. Part I. - The genus Serolis. Report on the Scientific Results of the Voyage of HMS Challenger during the years 1873 - 76 Zoology 11: 1 - 85, pls I-X.", "Richardson H (1911) Isopodes du Sandwich du Sud. Anales de la Sociedad Cientifica Argentina, Buenos Aires 21: 395 - 400.", "Lutken CF (1858) Beskrivelse av en ny Serolis - Art, Serolis schythei Ltk. Videnskabelige Meddelelser fra Dansk Naturhistorisk Forening i Kjobenhavn: 98, pl 91.", "Fabricius JC (1775) Systema Entomologiae, sistens Insectorum Classes, Ordines, Genera, Species, adjectis Sysnonymis, Locis, Descriptionibus, Observationibus. Kortii, Flensburgi et Lipsiae.", "Nordenstam A (1933) Marine Isopoda of the families Serolidae, Idotheidae, Pseudidotheidae, Arcturidae, Parasellidae and Stenetriidae mainly from the South Atlantic. Further Zoological Results of the Swedish Antarctic Expedition, 1901 - 1903 3: 1 - 284, 282 pls, errata.", "Moreira PS (1977) Crustacea Isopoda collected during the oc / s`Almirante Saldanha' cruises in southern South America. Additions to the species of Serolis (Flabellifera, Serolidae). Boletim do Instituto Oceanografico, Sao Paulo 26: 257 - 271.", "Brandt A (1991) Zur Besiedlungsgeschichte des antarktishcen Schelfes am Beispiel der Isopoda (Crustacea, Malacostraca). Berichte zur Polarforschung 98: 1 - 240.", "Held C (2000) Phylogeny and biogeography of serolid isopods (Crustacea, Isopoda, Serolidae) and the use of ribosomal expansion segments in molecular systematics. Molecular Phylogenetics and Evolution 15: 165 - 178.", "Held C, Wagele J-W (2000) Temperature and extinction: molecular evidence for extinction and radiation events in Antarctic Serolidae (Crustacea, Isopoda). Zoology (Jena) 103 Supplement III: 102.", "Held C (2001) No evidence for slow-down of molecular substitution rates at subzero temperatures in Antartic serolid isopods (Crustacea, Isopoda, Serolidae). Polar Biology 24: 497 - 501."]}