01638nas a2200181   4500008004100000022001400041245016800055210006900223260000600292300001000298490001400308520098200322100002501304700002101329700002201350700002401372856006001396       2013                        eng d  a1469-776900aRediscovery and augmented description of the HMS ‘Challenger’ acorn worm (Hemichordata, Enteropneusta), Glandiceps abyssicola, in the equatorial Atlantic abyss0 aRediscovery and augmented description of the HMS Challenger acor  c7  a1–90 vFirstView3 aABSTRACT A 2009 oceanographic expedition of the Russian Academy of Sciences collected the anterior region of a single acorn worm (phylum Hemichordata, class Enteropneusta) by trawling at a depth of 5560 m in the Romanche Trench (equatorial Atlantic). The specimen was a ripe female with numerous, relatively small oocytes in each ovary. Phylogenetic analysis of rDNA sequences robustly placed the worm in the family Spengelidae. In addition, morphological features of the proboscis, collar, and anterior trunk region indicated that the worm was Glandiceps abyssicola, a species previously represented solely by the holotype, which had been dredged from the equatorial Atlantic in 1873 by the HMS ‘Challenger’ and subsequently sent to Germany for description by Spengel (1893). The holotype was presumably destroyed by World War II bombing; therefore, we here designate the Romanche Trench specimen as the neotype of G. abyssicola and supply an augmented species diagnosis.1 aHolland, Nicholas, D1 aOsborn, Karen, J1 aGebruk, Andrey, V1 aRogacheva, Antonina  uhttp://journals.cambridge.org/article_S002531541300068402335nas a2200241   4500008004100000022001400041245015500055210006900210300001400279490000800293520152500301653002801826653001801854653002001872100002201892700002101914700002201935700001501957700001701972700002401989700002502013856005502038       2012                        eng d  a1744-741000aObservations on torquaratorid acorn worms (Hemichordata, Enteropneusta) from the North Atlantic with descriptions of a new genus and three new species0 aObservations on torquaratorid acorn worms Hemichordata Enteropne  a244–2570 v1313 aEnteropneusts in the family Torquaratoridae were imaged using still and video cameras in the deep North Atlantic and then collected by remotely operated vehicles. From this material, we describe Yoda purpurata n. gen, n. sp., Tergivelum cinnabarinum n. sp., and Allapasus isidis n. sp. Individuals of the first two species were browsing completely exposed on the sea floor, whereas the specimen of the last species was encountered floating  1 m above the sea floor. Living specimens of Y. purpurata were 12–19 cm long and had a dark reddish-purple proboscis, collar, and genital wings (folded dorsally over the anterior region of the trunk). Members of this species were hermaphrodites (the first ever discovered in the phylum Hemichordata), with numerous separate testes and ovaries in the genital wings. Living specimens of T. cinnabarinum were 12–26 cm long and had a cinnabar-colored proboscis, collar, and back veils (arising from the anterior region of the trunk); sexes were separate, and body shape and internal morphology closely resemble those of its brown congener, T. baldwinae, from the eastern Pacific. The only specimen of A. isidis collected was a male 13 cm long and pale yellow when alive. Its body shape was proportionally shorter and broader than that of its orange congener, A. aurantiacus, from the eastern Pacific, but the internal anatomy of the two species is virtually identical. [Correction made after online publication August 21, 2012 to correct species name in preceding sentence.]10abenthopelagic lifestyle10ahermaphrodite10aTorquaratoridae1 aPriede, Imants, G1 aOsborn, Karen, J1 aGebruk, Andrey, V1 aJones, Dan1 aShale, David1 aRogacheva, Antonina1 aHolland, Nicholas, D  uhttp://dx.doi.org/10.1111/j.1744-7410.2012.00266.x