Plaxiphora

Abstract: Plaxiphora boydeni n.sp. from wave‐exposed rocky shores of southern New Zealand is described and illustrated. This is the first published record of the genus from the New Zealand mainland. P. boydeni is readily distinguished from the 2 other New Zealand species of the genus, which occur in the subantarctic region, by the absence of bristle‐tufts on the girdle.

Abstract: A diverse assemblages of well-preserved polyplacophoran shell plates is present in Holocene marine deposits along the Beagle Channel, Tierra delFuego(548S).Theyrepresent thefirstfossilQuaternaryreport ofpolyplacophoransfromsouthernSouthAmerica. The taxainclude Callochiton puniceus (Couthouy MS, Gould), Plaxiphora aurata (Spalowsky), Plaxiphora sp., Tonicia atrata (Sowerby), Tonicia calbucensis Plate, Tonicia chilensis(Frembly), and Tonicia lebruni de Rochebrune. The presence of these taxa in a transitory area between the Atlantic and the Pacific oceans suggests that, in the recent past, the Beagle Channel acted as a path that facilitated faunal dispersion between the two oceans. These records also show an apparent stability of these faunas over a period of several thousand years (from ca. 7500 years BP to present). # 2009 Elsevier Masson SAS. All rights reserved.

Abstract: SUMMARY The present study of the chiton fauna of the Marquesas islands, mostly based upon material collected at Nuku-Hiva, revealed the presence of five species, one new to science: Acantbopleura gemmata (Blainville, 1825), Chiton marquesanus Pilsbry, 1893, Rhyssoplax linsleyi Burghardt, 1973, Plaxiphora gwenae n. sp., and an unrecognized species of Tonicia.