ivb_134_3_oc_OC.qxd 8/18/2015 10:23 AM Page 1 Invertebrate Invertebrate Biology wileyonlinelibrary.com/journal/ivb VOLUME 134 | NUMBER 3 | 2015 VOLUME 134 NUMBER 3 2015 | | Biology CONTENTS 181–188 Ultrastructure of the rotifer integument: peculiarities of Sinantherina socialis (Monogononta: Invertebrate Biology Gnesiotrocha) Rick Hochberg, Adele Hochberg, and Courtney Chan 189–202 Linking zebra mussel growth and survival with two cellular stress indicators during chronic VOLUME temperature stress Jennifer A. Jost, Emily N. Soltis, Marshall R. Moyer, and Sarah S. Keshwani 134 203–213 Sex‐specific reproductive investment of summer spawners of Illex argentinus in the southwest | NUMBER Atlantic Dongming Lin, Xinjun Chen, Yong Chen, and Zhou Fang 3 – | 214 230 Immunohistochemical investigations of the development of Scoloplos armiger (“intertidalis clade”) 2015 indicate a paedomorphic origin of Proscoloplos cygnochaetus (Annelida, Orbiniidae) Conrad Helm, Anne Krause, and Christoph Bleidorn 231–241 Effects of tidal height and wave exposure on cirrus and penis morphology of the acorn barnacle Tetraclita stalactifera J. Matthew Hoch and Kevin V. Reyes 242–251 The distribution of cave twilight‐zone spiders depends on microclimatic features and trophic supply Raoul Manenti, Enrico Lunghi, and Gentile Francesco Ficetola 252–259 A non‐destructive tissue sampling technique for holothurians to facilitate extraction of DNA for genetic analysis Samantha J. Nowland, Dean R. Jerry, and Paul C. Southgate 260 Erratum COVER ILLUSTRATION Cave habitats are unusual among terrestrial habitats because most of their trophic resources are ultimately derived by transport from surface communities. The amount and distribution of these resources in caves may have strong effects on the biology of cave-dwelling species. In this issue, Manenti et al. (pp. 242–251) surveyed the “twilight zones” of many caves in two regions of Italy for the presence and abundance of a large invertebrate predator, the spider Meta menardi. An adult of that species ~17 mm in body length (excluding legs) is shown on our cover. They also quantified a variety of cave physical parameters and the abun- dance of a prey species, the fly Limonia nubeculosa. Across all caves surveyed, spiders were most likely to be found in caves with the highest abundance of prey species. Their results suggest that the distribution of trophic resources plays a large role in con- An international journal of the American Microscopical Society trolling the distribution of this predator; further, they suggest that the abundance of the easily surveyed spider may be a good indicator of the quantity of trophic resources available in a cave. (Photograph by Enrico Lunghi.) and the Division of Invertebrate Zoology/SICB ISSN (Print): 1077-8306 ISSN (online): 1744-7410.