Review and phylogeny of the Recent Polycopidae Os

Authors: Ivana Karanovic Simone Nunes Brandão

Publish Date: 2012/03/14

Volume: 42, Issue: 3, Pages: 329-393

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Abstract

Polycopidae Sars 1866 ostracods from the DIVA II expedition of the RV “Meteor” at the Cape Angola and Guinea basins are presented here They were collected between 26 February and 30 March 2005 from depths between 5047 and 5150 m Metapolycope divae sp nov belongs to the subfamily Polycopsisinae Chavtur 1983 and stands apart from the other representatives of the genus by the morphology of the uropodal lamellae The remaining eight new species described herein belong to the subfamily Polycopinae Sars 1866 The genus Archypolycope Chavtur 1981 is represented in the investigated area by four new species A atlantica sp nov A brandtae sp nov A louisi sp nov and A martinezi sp nov With the addition of these four new species this genus is redefined to include six Recent and three fossil species Archypolycope atlantica is the only representative in the family with six bristles ventrally on the first segment of the mandibula The other three new species stand apart by the specific shell ornamentation chaetotaxy of the maxillula and morphology of the uropodal lamellae Archypolycope cornea Chavtur 1981 and A rotunda Chavtur 1981 both described from the abyssal depths of the KurilKamchatka trench are here excluded from the genus The decision is based on the absence of the peculiar morphology of the fifth limb endopod which is shared by all other Archypolycope These species are transferred to the genus Pseudopolycope Chavtur 1981 because they have a fifth limb endopod consisting of a segment and one terminal bristle but are placed in separate new subgenus Divacope subgen nov The new subgenus differs from the nominotypical subgenus by a much shorter fusion of the two bristles on the Bellonci Organ and by the presence of hooks on the male antenna Besides Pseudopolycope D cornea Chavtur 1981 comb nov and P D rotunda Chavtur 1981 comb nov the subgenus has been defined to include one more member P D chavturi sp nov which is also described from the deep South Atlantic and designated the type species of the new subgenus It is most closely related to P D cornea but differs from it by the chaetotaxy of the antennula and morphology of the exopod mandibula Two new species P P quasivitjazi sp nov and P P spio sp nov from the deep South Atlantic are added to the nominotypical subgenus which now has 15 Recent species One of the new species described here could not be accommodated into any of the known Polycopinae genera so the new genus Hyphalocope gen nov was erected for it and defined by the following autapomorphies completely flat dorsal margin of the shell presence of the bifurcated bristles on the shell elongated antennula and very long Bellonci Organ Presently Hyphalocope dorsoithys gen et sp nov is known only from females We provide a key to genera of the family Polycopidae and keys to species of the genera Metapolycope Archypolycope and Pseudopolycope In order to learn about the phylogenetic relationships and to point out some current problems of polyphyletic and paraphyletic genera in the subfamily Polycopinae we perform a cladistic analysis based on 29 morphological characters scored for 91 Recent species Two species from the genus Metapolycope are chosen as outgroups Extensive discussion on the distribution and suitability of morphological characters in this family is also provided All Recent species of Polycopidae are listed at the end with information about their geographic and bathymetric distributions habitat presence of sexes and body lengthThis project is partly accomplished from the CeDAMar funding for the taxonomic description The junior author is currently the Alexander von Humboldt postdoctoral fellow and the paper was partly written while the senior author was also a fellow of this organization We would like to thank Ms Renate Walter ZMH for her help with the SEMSummary of biogeography and ecology of Recent Polycopidae species In male and female columns + means that the adults of these sexes have been described – means that the morphology of this sex is unknown The coordinates are approximate and correspond with the type locality other possible findings are not given since they are always in close proximity of the type locality An asterisk indicates that the coordinates were not given by the original author but approximated by ourselves

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