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Series:

Edited by Charles Fransen

This volume is dedicated to the memory of the eminent carcinologist Michael Türkay, of the Research Institute and Natural History Museum Senckenberg, Frankfurt am Main, Germany. It is a tribute to his outstanding international contribution to the study of decapod crustaceans. An extensive account of Michael’s life and achievements is presented, along with thirty-one scientific papers by 62 of his friends and colleagues from around the world. The book’s focus is almost entirely on decapod crustaceans, and covers a variety of topics, including taxonomy, systematics, zoogeography, morphology, palaeontology, genetics, general biology and ecology. Numerous new taxa are described from a number of marine and freshwater groups, including one new genus and 13 new species named in honour of Michael himself.

The contents of this volume were originally published in 2017 in Crustaceana volume 90, issue 7-10.

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Tohru Naruse and Daisuke Uyeno

Abstract

A new species of aphanodactylid genus Ankerius Ng, Rahayu & Shih, 2016, is described from Iriomote Island, Ryukyu Islands, Japan. Ankerius grusocurare n. sp. is distinct from the only congener, A. aenigmaticus, by the shape of the lateral corner of the front (= supraorbital tooth), proportionally wider carapace, and the fewer number of the teeth along the upperflexor margin of the ambulatory meri. The present study brings the number of aphanodactylid taxa to 13 species.

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Peter K. L. Ng, Paul F. Clark, Santanu Mitra and Appukuttannair Biju Kumar

Abstract

The identity of the pea crab, Arcotheres borradailei (Nobili, 1906) is clarified. The holotype female is re-diagnosed, figured and its recent generic assignment to Arcotheres Manning, 1993, is discussed. A second poorly known species from India and Sri Lanka that resembles A. borradailei, Pinnotheres ridgewayi Southwell, 1911, is redescribed and assigned to Arcotheres. In addition, Pinnotheres sinensis atrinae Sakai, 1939, and Pinnotheres cyclinus Shen, 1932, from East Asia are re-examined and also referred to Arcotheres.

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S. A. Sudnik

Abstract

The size-sex structure and reproduction of the pelagic shrimp Oplophorus spinosus (Brullé, 1839) in the northwestern African continental slope is described herein. A total of 175 males and 53 females were caught by pelagic and bottom trawls at depths of 354-913 m in October-May 2003-2005. Total book-body length (TL) was 20-55.5 mm in males and 28.5-54 mm in females. Female TL at first maturity was 31 mm, the TL of ovigerous females ranged from 39.5-54 mm. Fecundity varied from 5 to 25 eggs with an outer diameter of 3.21 ± 0.19 mm at the beginning of embryogenesis and 3.14 ± 0.16 mm at half-time. O. spinosus has a continuous spawning period with a possible peak in spring. Its main reproductive traits are similar to those of this species from the Pacific and are comparable with the other species of this genus. In general, Oplophorus spp. are typical K-strategists with large-sized eggs and low fecundity.

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Raquel C. Buranelli and Fernando L. Mantelatto

Abstract

Population genetic studies on marine taxa, specifically in the field of phylogeography, have revealed distinct levels of genetic differentiation in widely distributed species, even though they present long planktonic larval development. A set of factors have been identified as acting on gene flow between marine populations, including physical or physiological barriers, isolation by distance, larval behaviour, and geological and demographic events. In this way, the aim of this study was to analyse the genetic variability among populations of the crab species Sesarma rectum Randall, 1840 along the western Atlantic in order to check the levels of genetic diversity and differentiation among populations. To achieve this purpose, mtDNA cytochrome-c oxidase subunit I (COI) (DNA-barcode marker) data were used to compute a haplotype network and a Bayesian analysis for genetic differentiation, to calculate an Analysis of Molecular Variance (AMOVA), and haplotype and nucleotide diversities. Neutrality tests (Tajima’s D and Fu’s Fs) were accessed, as well as pairwise mismatch distribution under the sudden expansion model. We found sharing of haplotypes among populations of S. rectum along its range of distribution and no significant indication for restricted gene flow between populations separately over 6000 km, supporting the hypothesis of a high dispersive capacity, and/or the absence of strong selective gradients along the distribution. Nevertheless, some results indicated population structure suggesting the presence of two genetic sources (i.e., groups or lineages), probably interpreted as a result of a very recent bottleneck effect due to habitat losses, followed by the beginning of a population expansion.

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Moritz Sonnewald and Michael Türkay

Abstract

This study comprises and compares epibenthic samples of the marine crustacean decapod megafauna, taken with a beam trawl at numerous stations in the German Exclusive Economic Zone of the North Sea in the years 1987, 1990, 2007 and 2013. All decapod crustacean species were recorded quantitatively. An overview of the decapod faunal composition with respect to changes in space, species and abundance with time is given. A time-dependent decrease of rare and often northern species at the research area is obvious, as a result of an increase of some dominant species concentrating in coastal areas. In 2013, a more uniform species composition seems to have developed. Decapod species and abundance depletions may be influenced by many factors, among them also climate change and fisheries.

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Sancia E. T. van der Meij

Abstract

A new gall crab species is described from the stony coral genus Caulastraea, a new host coral genus for Cryptochiridae crabs. Specimens were collected during fieldwork off Kudat (Malaysian Borneo) and Okinawa (Japan). Further material was retrieved from the collections of the Institute of Oceanography in Nha Trang (Vietnam). The new species, here named Lithoscaptus tuerkayi sp. nov., is the tenth assigned to the genus in which it is tentatively placed. It can be separated from its congeners by the strongly demarcated, inverted V-shaped protuberance flanking the mesogastric region, with denuded spots on the anterolateral sides of this inverted V-shape, as well as the denuded area just below the frontal margin. Based on morphology and COI sequence data, the closest species to L. tuerkayi sp. nov. is determined to be Lithoscaptus helleri (Fize & Serène, 1957).

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Bernd Werding and Alexandra Hiller

Abstract

A new species of porcellanid crab from the southern Caribbean Sea is described. Pachycheles tuerkayi n. sp. has been confused with P. serratus (Benedict, 1901) since the 1950s because the two species are morphologically and ecologically similar and have overlapping distributions in the southern Caribbean. P. tuerkayi n. sp. is restricted to the coasts of Costa Rica, Panamá and Colombia. P. serratus ranges from Puerto Rico and the Virgin Islands to the coasts of Panamá, Colombia and Venezuela. Genetic differences based on DNA sequences of the mitochondrial 16S rDNA gene from the two species surpassed those estimated for geminate porcellanids on each side of the Isthmus of Panamá. Field observations where P. tuerkayi n. sp. and P. serratus overlap indicated that the two species come into contact when sharing the same substrate. The total number of porcellanid species in the western Atlantic rises to 50.

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R. N. Burukovsky

Abstract

The food composition of the shrimp Crangon allmanni from the Helgoland Trench (North Sea) and Onega Bay (White Sea) is described. The main food items (>60%) include detritus, representatives of about 30 benthic species, dominated by polychaetes, malacostracans, ophiuroids, bivalves and ophistobranchs (Cylichna, Diaphana spp.) as well as plant remains. In the North Sea, C. allmanni is closer to an attacking predator than to a predator-gatherer like in the White Sea. This difference may be caused by diverging habitat- and community characteristics and dissimilar size composition of the two studied shrimp populations. Moreover, C. allmanni changes its foraging mode (grazing, gathering, attacking) during ontogenesis. A comparison of the obtained food composition data of C. allmanni with literature data on six other species of the same genus showed all to be benthos feeders, predator-gatherers with elements of detrito- and necrophagia, using grains of sand as millstones in their gastric mill.

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Carola Becker and Michael Türkay

Abstract

Pinnotherids, or pea crabs, are symbionts of invertebrates used for shelter and as food source. Feeding strategies and morphological adaptations to food uptake are important to understand host relations and how the host specificity is determined. We herein re-examine the host range of pinnotherids based on long-term collections from different localities in European waters. Both species of Pinnotheres are restricted to bivalves. Pinnotheres pisum infests mussels, oysters, the noble pen shell Pinna nobilis and other bivalves. Pinnotheres pectunculi is symbiotic with Glycymeris glycymeris and several other species of venerids. Nepinnotheres pinnotheres infests ascidians and Pinna nobilis. Observations on feeding in Pinnotheres reveal how mucus strings are brushed from the host gills with a setal comb in the chelipeds, which we describe by using scanning electron microscopy. Our observations on feeding structures are discussed in relation to the host specificity of each species and compared to other pinnotherid taxa, taking additional factors of host choice into account.