Invertebrate Systematics Invertebrate Systematics Society
Systematics, phylogeny and biogeography

Invertebrate Systematics

Invertebrate Systematics

Invertebrate Systematics publishes significant contributions and reviews on the systematics, phylogeny and biogeography of all invertebrate taxa. Read more about the journalMore

Editor-in-Chief: Gonzalo Giribet

Current Issue

Invertebrate Systematics

Volume 31 Number 6 2017

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Filistatinella spiders are found in semiarid areas of North America, and represent an ancient branch of the spider tree of life. After investigating specimens deposited in scientific collections, seven new species were discovered, and their morphology suggests Filistatinella are relatives of Pholcoides from Asia. This study suggests that many Filistatidae species remain to be discovered, and adds yet another piece to the puzzle of early spider evolution.

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Neotropical insects are so poorly known that we keep discovering new taxa there, often of a puzzling nature. With the aid of morphology-based phylogenetic analysis, we describe such a rove beetle, a new genus and species placed in the south temperate subtribe Amblyopinina. This is a step towards elucidating Neotropical biodiversity and appreciation of the biogeographic complexity of its core, the tropical Andes.

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We describe a novel genus and species of soft coral from North Carolina. This species was not previously reported in the South Atlantic Bight, suggesting it may not be native to the region. The discovery of this species underscores the value of taxonomic work and highlights the need to investigate and document understudied taxa, including soft corals.

IS16091Astrocoryne cabela, gen. nov. et sp. nov. (Hydrozoa : Sphaerocorynidae), a new sponge-associated hydrozoan

Davide Maggioni, Paolo Galli, Michael L. Berumen, Roberto Arrigoni, Davide Seveso and Simone Montano
pp. 734-746
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All the species belonging to the hydrozoan family Sphaerocorynidae live in association with sponges and often show a confusing taxonomic history. According to both morphological and molecular analyses, we herein describe the new genus and species Astrocoryne cabela from the Red Sea and Maldives. The present study suggests that a comprehensive revision of the family is needed to clarify the diversity and evolution of this taxon.

IS17001Taxonomic reassessment of species within the chrysaoros group of Calisto (Lepidoptera : Nymphalidae : Satyrinae)

Rayner Núñez Aguila, Antonio R. Pérez-Asso and Julio A. Genaro
pp. 747-764
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We reassess the taxonomic status of several Calisto Hübner taxa included in the archebates and hysius species groups. By using COI barcodes and morphological evidence, we recognise Calisto clydoniata Schwartz & Gali and C. chrysaoros Bates as valid species and propose C. clenchi, syn. nov., C. galii galli, syn. nov. and C. galii choneupsilon, syn. nov. as synonyms of C. chrysaoros. Further work must be focused on other species group members to reassess their affinity.

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The distinctive ant genus Leptomyrmex Mayr, 1862 had been thought to be endemic to Australasia for over 150 years, but enigmatic Neotropical fossils have challenged this view for decades. Our results highlight the importance of securing sufficient taxon sampling for extant lineages when incorporating fossils and underscore the utility of diverse character sources in accurate placement of fossil terminals. Specifically, we find that fossil placement in this group is influenced by the inclusion of male-based characters and the newly discovered Neotropical ‘Lazarus taxon’.


Velvet worms are a primitive invertebrate group, restricted to forested environments and characterised by limited dispersal. In the present study, the population genetic structure of two velvet worm species was examined. Results demonstrated marked species diversity and genetic structure among forest patches, indicating that forest patches need higher conservation prioritisation.

IS16058The identity of Monomia argentata (Crustacea : Brachyura : Portunidae) resolved by X-ray, computed tomography scanning and molecular comparisons

Milan Koch, Seyit A. Kamanli, Oliver Crimmen, Chia-Wei Lin, Paul F. Clark and Zden?k ?uriš
pp. 797-811
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The taxonomic status and identity of Monomia argentata was confused for long time; previously published studies indicated a presence of its species complex, without resolving the original form. The aim of this study was to examine the type specimen of M. argentata by traditional and modern diagnostic methods, and to clarify its taxonomic position. The type specimen was examined by X-ray and CT-technology, compared with fresh material, and redescribed.

Paper By Paper

The peer-reviewed and edited version of record published online as it becomes available

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This study is the first attempt to delimit Cryptocercus species on a large scale, including different species delimitation analysis methods. We aim to find the unrecognized diversity of Cryptocercus in the Hengduan Mountains, then we combined our data with biogeography to interpret the rich diversity of Cryptocercus in China. Our results have shed new light on the diversity of Cryptocercus.

Published online 09 January 2018

IS17028Molecular phylogeny of branchiobdellidans (Annelida : Clitellata) and their host–epibiont association with Austropotamobius freshwater crayfish

I. Šarić, G. Klobučar, M. Podnar, A. Štambuk and I. Maguire
pp. 55-68
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Branchiobdellidans are ectosymbiotic annelids associated with freshwater crayfish. Here, we inferred, using mtDNA COI sequences, the phylogenetic relationships of branchiobdellidans from the genus Branchiobdella living on the Austropotamobius crayfish, from Dinaric and Alpine regions of Europe. High intraspecific p-distance values were observed, indicating the existence of cryptic taxa within genus Branchiobdella, while congruent phylogenetic patterns within Austropotamobius and branchiobdellidans indicate similar evolutionary histories and imply their coevolution. Photograph: Branchiobdella parasite, by G. Klobučar.

Published online 09 January 2018

IS17021The zoogeography of extant rhabdopleurid hemichordates (Pterobranchia : Graptolithina), with a new species from the Mediterranean Sea

Elena Beli, Giorgio Aglieri, Francesca Strano, Davide Maggioni, Max J. Telford, Stefano Piraino and Christopher B. Cameron
pp. 100-110
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Rhabdopleura is a colonial, tubicolous animal with a near half billion-year old fossil record. Here we use morphology and molecules to describe a fifth living species, named R. recondita, that inhabits dead bryozoan skeletons. The habitat of rhabdopleurids, the ability to form buds from cells protected inside of the tubes, and clonal reproduction may have contributed to Rhabdopleura’s longevity.

Published online 09 January 2018

IS17038Further polyphyly of pinnotheroid crabs: the molecular phylogenetic position of the polychaete-associated Aphanodactylidae

Ling Ming Tsang, Shane T. Ahyong, Hsi-Te Shih and Peter K. L. Ng
pp. 92-99
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Pea crabs, Pinnotheroidea, being highly specialised to live symbiotically (obligate commensalism) with other marine invertebrates, were long thought to have a common ancestor. Our molecular analysis shows that the lineage symbiotic with medusa worms, Aphanodactylidae, evolved independently of other pea crabs and is more closely related to the free-living ghost and sentinel crabs. This indicates that obligate commensalism has evolved independently at least three times within the crabs.

Published online 08 January 2018

IS17035Cosmopolitan polychaetes – fact or fiction? Personal and historical perspectives

Pat Hutchings and Elena Kupriyanova
pp. 1-9

Until the 1980s ‘cosmopolitan’ species were considered common among polychaetes. We examine how this idea originated and argue that while wide distributions are possible in the deep sea and as a result of bioinvasions, they are rare. We suggest the measures needed to revolve the status of reportedly cosmopolitan species and stress the value of museum vouchers associated with DNA sequences.

Published online 08 January 2018

IS16071Taxonomic revision and insights into the speciation mode of the spider Dysdera erythrina species-complex (Araneae : Dysderidae): sibling species with sympatric distributions

Milan Řezáč, Miquel A. Arnedo, Vera Opatova, Jana Musilová, Veronika Řezáčová and Jiří Král
pp. 10-54
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Sibling species provide insights into the mechanisms involved in speciation. Here, we integrate information from morphology and molecular and chromosome markers to discover and delimit twenty sibling species within the woodlouse hunter spider Dysdera erythrina complex. Our results suggest that the combination of rapid chromosome differentiation and the dietary specialisation stands behind the origin of this remarkable, and so far mostly overlooked, diversity.

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