Morphological variation of Eucyclops elegans (Herrick, 1884) (Copepoda: Cyclopoida) in the Americas and comments on records of Eucyclops conrowae Reid, 1992

Based on an examination of material from different areas of the American continent, we evaluate the morphological variations of Eucyclops elegans (Herrick, 1884) with an emphasis on characters used in the current taxonomy of the genus. Eucyclops elegans is clearly a member of the serrulatus group. Differences in both female and male specimens from North America and South America and the lack of records in southern Mexico and Central America suggest that it is possible that this nominal species contains at least two taxa. Characters such as the ornamentation of the antennal basis and coxa of P4 are described for the tropical species E. conrowae Reid, 1992. This species is clearly not a member of the serrulatus group and differences with respect to the type specimens indicate that records of E. conrowae in Mexico do not correspond to this taxon and should be reassigned to other species.     

West Indian Neoathyreus and their over-water dispersal (Coleoptera: Scarabaeidae: Geotrupinae)

Neoathyreus androsensis n.sp., is described from Andros Is. in the Bahamas and from Cayo Coco, Cuba. The new species and four other previously described species, now known to occur in the West Indies, are briefly described, keyed and figured. One species, Neoathyreus lanei (Martínez) occurs in the Lesser Antilles and also in northern South America. The four other species occurring on either Cuba, the Bahamas, or Hispaniola are closely related to each other and somewhat less so to the Neoathyreus hamifer complex, known from Mexico and Central America. A minimum of two or three over-water dispersals by ancestral forms seem to be necessary to explain the current distributions of at least some of these West Indian species.     

A new Stelis (Dolichostelis) from northern Colombia (Hymenoptera: Megachilidae): first records for South America and a synopsis of the bee fauna from the Caribbean region of Colombia

The cleptoparasitic anthidiine bee genus Stelis Panzer is primarily Holarctic in distribution, extending as far south as Costa Rica. A new species of Stelis subgenus Dolichostelis Parker and Bohart is described and illustrated based on females collected in dry forests of the Caribbean region of Colombia. Stelis (Dolichostelis) costaricensis Friese is also recorded from dry forests but in western Colombia. These are the first records of the genus, as currently recognized, for South America. An updated key to the species of Dolichostelis and a synopsis of the diversity and biogeography of the bee fauna from the Caribbean region of Colombia are provided. Based on reports from the literature and data from collections, we provide a checklist consisting of 125 species in 48 genera of five families. The complex composition of this bee fauna parallels that of the flora, with taxa having the following origins or distributions: West Indian, North or Central American, Andean, xeric or temperate South American, and Neotropical widespread. A brief account on the contribution of George Salt to the knowledge of the biology of this Colombian bee fauna is also provided.     

Introduced and exported American Scolytidae (Coleoptera)

Fourteen North, Central, and South American Scolytidae have reached areas outside of America, namely Hawaii (5), Australia (3), Southeast Asia (2), Africa (7), Europe (1), and worldwide (1). The 44 species introduced into North and Central America have originated in South America (10), Southeast Asia (15), Africa (14), or Europe (7). Four North and Central American species have extended their ranges into new territory within this region. Most of the species that breed in the bole or roots of their host were imported more than a half century ago; those imported since 1950 breed mostly in seeds, pods, dry fruits, or small branches. Forty - five of the 62 species apparently can reproduce by means of facultative arrhenotokic parthenogenesis.     

First record of the genus Leptodactylus (Anura: Leptodactylidae) in Cuba: Leptodactylus fragilis,a biological invasion?

The Neotropical genus Leptodactylus is currently represented by three species in the West Indies (Leptodactylus albilabris, Leptodactylus fallax and Leptodactylus validus). Based on morphological, acoustic and molecular evidence, we document the presence of a fourth species in the Caribbean region, Leptodactylus fragilis (Brocchi, 1877). The species was found at two localities in western Cuba, and molecular data suggest a northern South American origin, possibly Venezuela, for these populations. We discuss the potential invasive status of L. fragilis, based on its known distribution, relative abundance, behaviour and possible impacts on native species of Cuban amphibians.     

New Neotropical Haplothripini (Thysanoptera: Phlaeothripidae) with a key to Central and South American genera

The tribe Haplothripini includes a large diversity of Thysanoptera–Phlaeothripinae, comprising more than 550 species in about 35 genera. They are characterised by having a maxillary bridge in the head, prosternal basantra well developed and fore wings with a median constriction. Members of this group are present in all geographical regions, but are particularly poorly studied in Central and South America. In this study, we describe a new genus and species, Myrciathrips variabilis gen. et. sp. nov., and a new Haplothrips species; and propose two new combinations: Karnyothrips grassoi (De Santis), and Mirothrips vespicola (De Santis). A key to the nine Haplothripini genera now recognised from Central and South America is provided, together with an updated key to Haplothrips and Mirothrips species. A total of 45 species of Haplothripini are now recognised from Central and South America, and a list of these and their distributions is given. The genera Karnyothrips, Haplothrips and Leptothrips are the most commonly encountered, and some exotic species such as Androthrips ramachandrai and Dolichothrips indicus are now widespread in the Americas.     

Zoogeography and evolutionary ecology of the genus Platorchestia (Crustacea,Amphipoda, Talitridae)

ABSTRACT

Species of the genus Platorchestia occur both in the northern hemisphere (18 species) and southern hemisphere (three species plus a synanthropically introduced species in South America and South Africa). The greater number of endemic Platorchestia species in the North Pacific Ocean suggests that it could be the epicentre of evolution for this genus. North-western Pacific Platorchestia includes 15 species which occupy five ecotopes: wrack (seven species), terrestrial leaf litter (five species), freshwater (one species), marsh (one species) and tentatively present in caves (one species). North-eastern Pacific Platorchestia includes only one putative driftwood specialist, with no other species found in North American coastal habitats. This compares with three good endemic Platorchestia species (plus two putative additional species) and only two ecotopes: wrack (three species) and freshwater (two species) from the North Atlantic Ocean, inclusive of the Gulf of Mexico and Mediterranean Sea. Insufficient data is available to consider Platorchestia zoogeography for the Arabian Sea and Bay of Bengal. Synanthropic dispersal involving Platorchestia in Polynesian outrigger canoes, or in solid ballast carried in the holds of wooden sailing ships has been identified as a potential complicating factor in the zoogeography of this genus. Platorchestia is proposed to have arisen on Laurasia and is therefore basically a northern hemisphere genus. Questions concerning Platorchestia zoogeography and evolutionary ecology are posed and two methods (more intensive field sampling and molecular genetics) are suggested to be the way to solve them.     

The distribution of New Zealand and Australian terrestrial flatworms (Platyhelminthes: Turbellaria: Tricladida: Terricola) in the British Isles—the Scottish survey and MEGALAB WORMS

The New Zealand flatworm, Artioposthia triangulata, and the Australian flatworm, Caenoplana alba, have become quite widespread in the British Isles since their introduction, probably in the early 1960s. They are considered as pest species since they eat earthworms and consequently may affect soil structure and fertility. The distribution of the two species has been recorded by two surveys: a Scottish survey between 1991 and 1993, and a national survey, MEGALAB WORMS, in March 1995. The latter was organized as part of National Science Week by BBC TV Tomorrow's World, The Daily Telegraph newspaper and the Office of Public Service and Science. Results of both surveys are presented as distribution maps of confirmed records. New Zealand flatworms are common and widespread in Northern Ireland and Central Scotland, and occur less commonly in other parts of Scotland, and in Northern England. There are a few scattered records from Southern England. The Scottish survey has resulted in retrospective distribution maps. Australian flatworms are widespread in South West England, and are found in several places in North West England. There are also records from South and North Wales, Northern Ireland and one from Southern Scotland. There were many false and negative reports. There are records of both species from the Republic of Ireland.     

Revision of the American Pupisoma species (Gastropoda: Pupilloidea)

The American species of Pupisoma Stoliczka (Gastropoda: Pupilloidea) are revised. Five species are recognized. Pupisoma puella Hylton Scott has been synonymized with P. dioscoricola (C. B. Adams). This species occurs from southern USA through the Caribbean and Central America to the Galapagos Islands and to southern Brazil and northern Argentina. Pupisoma galapagorum Pilsbry, P. bailyi Pilsbry, and P. latens Hylton Scott have been synonymized with P. comicolense H. B. Baker. This species is distributed from Mexico to the Galapagos Islands, southern Brazil, and northern Argentina. Pupisoma costulata sp. n. from Andean forests in Colombia is described as new. The range of P. macneilli (Clapp) extends from southern USA through the Caribbean and Central America to southern Brazil and northern Argentina. A neotype has been designated for P. mediamericanum Pilsbry. Pupisoma michoacanense Pilsbry is a synonym of this species. This species occurs from Mexico to Colombia and on Jamaica.     

Two new Mastigodiaptomus (Copepoda,Diaptomidae) from southeastern Mexico,with a key for the identification of the known species of the genus

Two new species of the freshwater planktonic copepod genusMastigodiaptomus—M. maya and M. reidae—are described from material collected in southeastern Mexico. This neotropical genus is known to be distributed mainly in the southern part of the United States, Mexico and Central America, and now embraces eight species. Of these, six occur in Mexico. Both new species seem to be closely related to M. texensis and M. albuquerquensis. It is probable that this group of Mexican species represents a northwards radiation from the Proto-Antilles-Central America region into the continent, eventually reaching North America. A key for the identification of the known species of the genus is provided.     

On the genus Penthesilenula Rossetti and Martens, 1998 (Crustacea,Ostracoda, Darwinulidae) from (semi-) terrestrial habitats in São Paulo State (Brazil), with the description of a new species

Three species of darwinulid ostracods, belonging to the genus Penthesilenula, are reported from terrestrial and semi-terrestrial habitats in São Paulo State (Brazil). Penthesilenula reidae n. sp. is here described as new to science. It belongs to the africana-group in the genus and was found exclusively in bromeliad pouches. Penthesilenula aotearoa (in the incae-group) was previously known from New Zealand only and is here reported for the first time from South America. The third species, Penthesilenula brasiliensis, is here described from leaf litter in forests, constituting the first darwinulid taxon to be found in fully terrestrial habitats. The morphological diversity within P. brasiliensis s. l. is discussed and various lineages on different continents are retained within this species. The evolutionary significance of the high incidence of teratologies in the Darwinulidae is discussed. A tentative homology for the apical chaetotaxy of A2 between Darwinulidae and Cyprididae is offered.     

On a new and puzzling American rotifer (Rotifera: Monogononta,Lecanidae)

A new species of monogonont rotifer, Lecane difficilis n.sp., is described from French Guyana. The taxon also occurs in Brazil and North Carolina, USA, following reassessment of illustrated literature records. The superficial similarity of L. difficilis with the Old World tropical L. unguitata (Fadeew) may account for some non-verifiable records of the latter from the New world.     

Systematics and biology of the Rhinocolinae (Homoptera: Psylloidea)

Based on a cladistic analysis, the subfamily Rhinocolinae is redefined to comprise 13 genera and 39 species, of which two genera and eight species remain unnamed. Four new genera and 14 new species are described; one subfamily and one genus are synonymized, and two species are recombined; one lectotype is designated. The subfamily is divided into two groups, one with a Gondwanan distribution comprising four genera in Australia, New Zealand, South America and Africa, and another with Laurasian distribution in the Palaeotropics, the Western Palaerctic and North America comprising nine genera. Twenty-one species develop on host plants in the Rutales, three on Asteraceae, three on Cistaceae and one on Zygophyllaceae. The genus Pistacia (Anacardiaceae) in particular hosts six species whose biology is discussed.     

Helminth biodiversity of Costa Rican Anurans (Amphibia: Anura)

One hundred and sixty-three frogs representing 21 species collected in Costa Rica were examined for helminths. Those found were: one species of Digenea (Mesocoelium monas), one species of Cestoda (Cylindrotaenia americana), 15 species of Nematoda, 11 species represented by gravid individuals (Aplectana hylambatis, Aplectana incerta, Aplectana itzocanensis, Capillaria recondita, Cosmocerca parva, Cosmocerca podicipinus, Falcaustra costaricae, Hedruris heyeri, Oswaldocruzia costaricensis, Oswaldocruzia nicaraguensis, Rhabdias savagei) and four species represented by larvae (Physaloptera sp., Porrocaecum sp., Spirocamallanus sp., Ascarididae gen. sp.) and three species of Acanthocephala, one species represented by gravid individuals (Anuracanthorhynchus lutzi) and two species by cystacanths (Centrorhynchidae gen. sp. and Oligacanthorhynchidae gen. sp.). Mean helminth diversity (number of helminth species) per frog species was 2.4 ± 0.3 SE, range: 1–6. Forty-nine new host records are reported. Costa Rican frogs are infected by generalist helminths, which infect other species of frogs from Central and South America.     

Further morphological and molecular studies of driftwood hoppers (Crustacea: Amphipoda: Talitridae) from Mediterranean/north-east Atlantic coastlines

An unknown talitrid was discovered in 2011 in the Swale, UK, living in driftwood. Sequencing of multiple mitochondrial and nuclear genes (cytochrome oxidase I, 18S rDNA and 28S rDNA) confirms that the unknown taxon was close to Orchestia mediterranea A. Costa 1857. The driftwood in which it was found was of Douglas fir (Pseudotsuga menziesii), probably imported from North America. Relative growth methods allow us to reject the null hypothesis that the unknown taxon was a juvenile Orchestia mediterranea. This is because the unknown taxon initiates sexual maturation at an earlier moult number (neoteny) and is predicted to reach terminal moult stages at a much smaller size (dwarfism) than its closest relative O. mediterranea. Both molecular and morphological data confirm that the unknown taxon from the Swale, UK, is a new driftwood specialist taxon, distantly related to the driftwood specialist genus Macarorchestia. Additional data for body length and sex ratios are presented for Macarorchestia. In addition, relative growth methods have shown that the driftwood species Orchestia microphtalma Amanieu and Salvat 1964 is closer to the genus Macarorchestia rather than to the wrack generalist one, Orchestia. This evidence is in line with the molecular results that do not cluster morphologically defined species of Orchestia monophyletically.     

Insular species of Neotropical freshwater crabs (Crustacea: Brachyura)

One species of Trichodactylidae and four species of Pseudothelphusidae are present on continental islands in three areas of Central and South America. (1) Trinidad and Margarita Island have, in common with the Venezuelan mainland, the pseudothelphusid Eudaniela garmani (Rathbun, 1898); additionally, Trinidad shares with the mainland the trichodactylid Dilocarcinus dentatus (Randall, 1839). These disjunct distributions can be attributed to changes in sea level during the Quaternary, but the presence of the endemic pseudothelphusid Microthelphusa odaelkae (Bott, 1970) in Trinidad probably reflects an older connection with the continent. (2) A new species, Potamocarcinus roatensis, was found on Roatan Island, off the coast of Honduras. A cladistic analysis of the genus Potamocarcinus (H. Milne Edwards, 1853) revealed a close association of P. roatensis with P. magnus (Rathbun, 1896), a widely distributed Central American pseudothelphusid. Possibly both species originated in a pre-Quaternary vicariant event. (3) Another pseudothelphusid, Hypolobocera gorgonensis von Prahl, 1983, inhabits disjunct areas on Gorgona Island, off the Pacific coast of Colombia, and on the mainland of Ecuador, reflecting either a wider distribution before the last Holocene transgression or accidental dispersal through natural rafts.     

Improved geographic sampling provides further evidence for the separation of Glossiphonia complanata and Glossiphonia elegans (Annelida: Clitellata: Glossiphoniidae)

Historically, there has been much confusion surrounding the identity and separation of European and North American species of Glossiphonia (Annelida: Clitellata: Glossiphoniidae). Using cytochrome c oxidase subunit I (COI) sequences from newly collected specimens of Glossiphonia complanata and Glossiphonia elegans from a broad geographic range covering southern Canada, parts of the US, Slovenia and Croatia, we confirm that G. complanata is likely confined to Europe. The species is phylogenetically distinct from G. elegans, which seems to exclusively inhabit North America. Parsimony and maximum likelihood of the COI locus show the European samples placing as the sister group to an unidentified species of Glossiphonia from Russia, while the North American samples are the sister group to all other Glossiphonia species. We also investigate the consistency of number of crop cecae for separating these species and contrary to previous reports, this character shows no differences between our specimens of the two species. Additionally, the trees show evidence of subdivisions within both G. complanata and G. elegans, with some sequences separated by high ‘intraspecific’ distances. Forces might be shaping population structure and/or potential incipient speciation within these species, emphasizing the need for future research into the biogeography and population genetics of Glossiphonia.     

Two new species of Clinocentrus Haliday (Hymenoptera: Braconidae) from Argentina,with notes on South American species

The Argentine species of the genus Clinocentrus Haliday are revised. Two new species are described, Clinocentrus mamull sp. nov. and Clinocentrus roigi sp. nov., which represent the southernmost records of the genus in South America. Additionally Clinocentrus nigripectus Enderlein is redescribed and a key to known South American species is provided.