Revision of Testechiniscus Kristensen, 1987 (Heterotardigrada: Echiniscidae) refutes the polar-temperate distribution of the genus

Zootaxa ◽  
2018 ◽  
Vol 4472 (2) ◽  
pp. 261 ◽  
Author(s):  
PIOTR GĄSIOREK ◽  
DANIEL STEC ◽  
KRZYSZTOF ZAWIERUCHA ◽  
REINHARDT MøBJERG KRISTENSEN ◽  
ŁUKASZ MICHALCZYK
Keyword(s):  
Morphological Variability ◽  
Light And Electron Microscopy ◽  
Nominal Species ◽  
Northern Ethiopia ◽  
Molecular Tools ◽  
Microscopy Imaging ◽  
Antarctic Species ◽  
The Family ◽  
Bipolar Distribution ◽  
First Time

The family Echiniscidae comprises limno-terrestrial heterotardigrades with a strongly sclerotised dorsum, typically covered with plates. Among other members of the Echiniscus evolutionary line, the genus Testechiniscus Kristensen, 1987 stands out with well-developed ventral armature and polygonal sculpturing of the dorsal plates. It has alleged bipolar distribution (with satellite alpine records in the Holarctic). Thanks to fresh material from terra typica (Svalbard), we integratively redescribe (i.e. using light and electron microscopy imaging, morphometry, and molecular methods) the nominal species for the genus, Testechiniscus spitsbergensis (Scourfield, 1897). A comparison of the neotype series with a number of Holarctic records revealed morphological variability suggesting that the species may encompass several taxa, which, most likely, will be possible to delineate primarily with molecular tools. Moreover, based on material from Simien Mountains (Northern Ethiopia), we describe a new sibling subspecies, Testechiniscus spitsbergensis tropicalis ssp. nov. Extensive morphometric datasets are provided for the genus members for the first time. A new generic definition is proposed, embracing the two subspecies of T. spitsbergensis and T. laterculus (Schuster et al., 1980), but excluding two circum-Antarctic species, T. macronyx (Richters, 1907) and T. meridionalis (Murray, 1906). The later species are likely to be erected in the future as separate genera, and their autapomorphies are described here. In the light of our findings, the genus          Testechiniscus should be recognised as a native element of the Northern Hemisphere, with mainly circum-Arctic distribution and additional, insular alpine records from the Nearctic, Palearctic and Eastern Afrotropic. 

Cymatosirella Dąbek, Witkowski & Sabbe gen. nov., a new marine benthic diatom genus (Bacillariophyta) belonging to the family Cymatosiraceae

Phytotaxa ◽  
2014 ◽  
Vol 183 (2) ◽  
pp. 120
Author(s):  
PRZEMYSŁAW DĄBEK ◽  
KOEN SABBE ◽  
ANDRZEJ WITKOWSKI ◽  
COLIN ARCHIBALD ◽  
KRZYSZOF J. KURZYDŁOWSKI ◽  
...  
Keyword(s):  
New Genus ◽  
Light And Electron Microscopy ◽  
Benthic Diatom ◽  
Western Cape ◽  
Western Cape Province ◽  
Line Drawings ◽  
The Family ◽  
Diatom Genus ◽  
Electron Microscopical ◽  
First Time

We present a new marine benthic diatom genus Cymatosirella gen. nov. The genus belongs to the family Cymatosiraceae and has been assigned to the subfamily Extubocelluloideae on the basis of ultrastructural cell wall features. It has isovalvate cells with undulate valves and is characterized by the absence of tubular processes and the occurrence of hollow spines which are observed for the first time in the Cymatosiraceae. The new genus contains four species, two of which are transferred from the genus Cymatosira, viz. Cymatosirella capensis comb. nov. and Cymatosirella minutissima comb. nov., and two which are new to science, viz. Cymatosirella benguelensis sp. nov. and Cymatosirella taylorii sp. nov. Cymatosirella capensis is chosen as the generitype. The new genus includes a group of very small taxa inhabiting the intertidal zone of the Atlantic Ocean with three species in South Africa and one in Europe. C. capensis was originally described by Giffen from Langebaan Lagoon (a shallow marine inlet in the southern part of Saldanha Bay, Western Cape Province), on the basis of light microscopy only, and has to date only been illustrated by line drawings. C. minutissima, so far only known from the Westerschelde estuary (The Netherlands), has previously been documented in more detail using both light and electron microscopy. Here, we present the results of detailed light and electron microscopical investigations of C. capensis, both from its original type material and from recently collected samples from the type locality and neighboring littoral areas in the Western Cape Province, and of the new species C. benguelensis and C. taylorii, also from Western Cape localities. All species are compared with similar small taxa belonging to the Cymatosiraceae, subfamily Extubocelluloideae.

Colleters in the vegetative axis of Aechmea blanchetiana (Bromeliaceae): anatomical, ultrastructural and functional aspects

2018 ◽  
Vol 66 (5) ◽  
pp. 379 ◽  
Author(s):  
Igor Ballego-Campos ◽  
Elder Antônio Sousa Paiva
Keyword(s):  
Developmental Stages ◽  
Light And Electron Microscopy ◽  
Secretory Activity ◽  
Functional Roles ◽  
Reproductive Axis ◽  
Functional Aspects ◽  
The Family ◽  
Marginal Cells ◽  
First Time

Colleters are common among eudicotyledons, but few records exist for monocotyledons and other groups of plants. For Bromeliaceae, mucilage secretions that protect the young portions of the plant have been observed only in the reproductive axis, and little is known about the secretory systems behind this or even other kind of secretions in the family. We aimed to describe, for the first time, the occurrence of colleters associated with the vegetative shoot of Aechmea blanchetiana (Baker) L.B.Sm., and elucidate aspects of their structure, ultrastructure and secretory activity. Samples of various portions of the stem axis were prepared according to standard methods for light and electron microscopy. Colleters were found compressed in the axillary portion of leaves and in all leaf developmental stages. Secretory activity, however, was found to be restricted to young and unexpanded leaves. The colleters displayed a flattened hand-like shape formed by a multiseriate stalk and an expanded secretory portion bearing elongated marginal cells. Ultrastructural data confirmed that the secretory role of the colleters is consistent with mucilaginous secretion. The functional roles of the colleters are discussed with regard to environmental context and intrinsic features of the plant, such as the presence of a water-impounding tank.

A taxonomic review of the fish parasitic isopod family Cymothoidae Leach, 1818 (Crustacea: Isopoda: Cymothooidea) of India

Zootaxa ◽  
2019 ◽  
Vol 4622 (1) ◽  
pp. 1-99 ◽  
Author(s):  
S. RAVICHANDRAN ◽  
P. VIGNESHWARAN ◽  
G. RAMESHKUMAR
Keyword(s):  
Morphological Variability ◽  
Marine Fishes ◽  
Valid Species ◽  
Indian Species ◽  
Nominal Species ◽  
Host Preferences ◽  
As Species ◽  
The Family ◽  
Species Inquirenda ◽  
Parasitic Isopod

The parasitic isopod family Cymothoidae Leach, 1818 of the India exclusive economic zone is reviewed. A total of 56 nominal species corresponding to 48 valid species belonging to sixteen genera are reviewed from 73 host species belonging to 35 families. Mothocya plagulophora (Haller, 1880), Nerocila depressa Milne Edwards, 1840, Nerocila loveni Bovallius, 1887, Nerocila trichiura (Miers, 1877), Norileca triangulata (Richardson, 1910) and Ryukyua globosa Williams & Bunkley-Williams, 1994 are redescribed. Indusa pustulosa Pillai, 1954 is synonymised with Agarna malayi Tiwari, 1952; Cymothoa krishnai Jayadev Babu & Sanjeeva Raj, 1984 is synonymised with Cymothoa eremita (Brünnich, 1783) and Nerocila priacanthusi Kumari, Rao & Shyamasundari, 1987 is synonymised with Nerocila arres Bowman & Tareen, 1983. Ourozeuktes bopyroides (Lesueur, 1814) is revised and excluded from the Indian fauna. The Indian cymothoid species Agarna bengalensis Kumari, Rao & Shaymasundari, 1990, Cymothoa asymmetrica Pillai, 1954 and Nerocila hemirhamphusi Shyamasundari, Rao & Kumari, 1990 are regarded here as species inquirenda. A key to the Indian genera of the family Cymothoidae and keys to the Indian species of the genera Cymothoa, Joryma, Mothocya, and Nerocila are presented. A checklist of the valid Cymothoidae species until now reported from Indian marine fishes are compiled. Host preferences, morphological variability and distribution are discussed. 

An integrative study of some species of Gonaxia Vervoort, 1993 from off New Caledonia, with the establishment of Gonaxiidae as a new family of thecate hydroids (Cnidaria: Hydrozoa)

Zootaxa ◽  
2021 ◽  
Vol 5004 (3) ◽  
pp. 401-429
Author(s):  
HORIA R. GALEA ◽  
DAVIDE MAGGIONI
Keyword(s):  
Genetic Characterization ◽  
New Caledonia ◽  
Nominal Species ◽  
New Family ◽  
Deep Waters ◽  
The Family ◽  
Morphological Approach ◽  
Integrative Study ◽  
First Time

Ten species belonging to the genus Gonaxia Vervoort, 1993 occur in recent collections gathered by KANACONO (2016), KANADEEP (2017) and KANADEEP 2 (2019) expeditions of the French Tropical Deep-Sea Benthos Program in deep waters of the New Caledonian region. They were studied using the classical, morphological approach, supplemented by the first genetic characterization of the genus undertaken so far. Two species are previously undescribed, namely G. incisa Galea, sp. nov. and G. solenoscyphoides Galea, sp. nov. Additional notes on the remaining species are provided, notably the discovery of the female gonothecae of G. crassicaulis Vervoort, 1993 and G. perplexa Vervoort, 1993. Lofty colonies, with distinctive cladia-bearing branches spirally-arranged around the stem, assignable to the recently-described G. plumularioides Galea, 2016 actually represent fully-developed colonies of G. errans Vervoort, 1993, as demonstrated using molecular markers, the latter nominal species having priority. Its unusual, club-shaped, longitudinally-ridged gonothecae, fully free from the stem, are described for the first time. Supplementary notes on the hydrotheca of G. crassicaulis Vervoort, 1993 are provided, together with the description of a distinctive gutter of perisarc channeling the coenosarc of the colony along the lumen of both the stem and cladia. A multi-locus phylogenetic hypothesis of the Macrocolonia supports the establishment of the family Gonaxiidae Maggioni, fam. nov., to accommodate the species dealt with herein.

A REVISED CLASSIFICATION OF THE PIOPHILIDAE, INCLUDING ‘NEOTTIOPHILIDAE’ AND ‘THYREOPHORIDAE’ (DIPTERA: SCHIZOPHORA)

1977 ◽  
Vol 109 (S103) ◽  
pp. 1-66 ◽  
Author(s):  
J. F. McAlpine
Keyword(s):  
Sister Group ◽  
Systematic Position ◽  
Valid Species ◽  
Nominal Species ◽  
British Guiana ◽  
Evolutionary Changes ◽  
The Family ◽  
British Honduras ◽  
New Synonymy ◽  
First Time

AbstractThe systematic position of the Piophilidae sens. lat. within a group of nine schizophorous families with tephritid-like ovipositors (Lonchaeidae, Otitidae, Platystomatidae, Pyrgotidae, Tephritidae, Tachiniscidae, Richardiidae, Pallopteridae, and Piophilidae) is elucidated. It is shown to be a sister-group of the Pallopteridae, and these two families together with the Richardiidae comprise a monophyletic suprafamily unit within the larger group of families. The evolutionary changes that occurred within the Piophilidae are analyzed and the supposed phylogeny of its component taxa is portrayed. The family is redefined to include neottiophilids and thyreophorids and is classified into two subfamilies, Neottiophilinae and Piophilinae; the latter is divided into two tribes, Mycetaulini and Piophilini (with subtribes Piophilina and Thyreophorina). Twenty-three genera are recognized and taxonomically defined; this includes description of two new genera, Neopiophila and Parapiophila. Clusina Curran is synonymized withProtopiophila Duda (new synonymy), and four nominal species are placed in synonymy for the first time, i.e. Piophila anomala Malloch and Piophila setosa Melander and Spuler = Parapiophila vulgaris (Fallén) (new synonymy), Piophila flavifacies Brunetti = P. casei (Linnaeus) (new synonymy), and Mycetaulus pulchellus Banks = Mycetaulus longipennis Loew (new synonymy). Six new species, Actenoptera avalona (Newfoundland), Neopiophila setaluna (Northwest Territories), Protopiophila atrichosa (Peru and British Honduras), Protopiophila pallida (Peru and British Guiana), Prochyliza azteca (Mexico), and Prochyliza inca (Peru) are described. The following 20 new combinations are made: Mycetaulus lituratus (Melander and Spuler), Allopiophila testacea (Melander), Protopiophila nigriventris (Curran), Prochyliza lundbecki (Duda), nigricornis (Meigen), nigricoxa (Melander and Spuler) and nigrimana (Meigen), Arctopiophila arctica (Holmgren), Parapiophila atrifrons (Melander and Spuler), calceata (Duda), coerulescens (Zetterstedt), dudai (Frey), flavipes (Holmgren), lonchaeoides (Zetterstedt), nitidissima (Melander and Spuler), pectiniventris (Duda), penicillata (Steyskal), vulgaris (Fallén), and xanthopoda (Melander and Spuler). In all, 67 valid species are placed, their geographic distributions are outlined, and the zoogeographic implications are discussed. A lectotype is designated for Piophila flavitarsis Meigen = Madiza glabra Fallén (Milichiidae).A key to subfamilies, tribes, and genera is provided, and keys to world species are given where needed. An annotated world list of all names referred to the family (sens. lat.) is provided. The paper includes 58 figures, two tables, and 122 literature references.

Cymatosirella Dąbek, Witkowski & Sabbe gen. nov., a new marine benthic diatom genus (Bacillariophyta) belonging to the family Cymatosiraceae

Phytotaxa ◽  
2013 ◽  
Vol 121 (1) ◽  
pp. 42 ◽  
Author(s):  
PRZEMYSŁAW DĄBEK ◽  
KOEN SABBE ◽  
ANDRZEJ WITKOWSKI ◽  
COLIN ARCHIBALD ◽  
KRZYSZOF J. KURZYDŁOWSKI ◽  
...  
Keyword(s):  
New Genus ◽  
Light And Electron Microscopy ◽  
Benthic Diatom ◽  
Western Cape ◽  
Western Cape Province ◽  
Line Drawings ◽  
The Family ◽  
Diatom Genus ◽  
Electron Microscopical ◽  
First Time

We present a new marine benthic diatom genus Cymatosirella gen. nov. The genus belongs to the family Cymatosiraceae and has been assigned to the subfamily Extubocelluloideae on the basis of ultrastructural cell wall features. It has isovalvate cells with undulate valves and is characterized by the absence of tubular processes and the occurrence of hollow spines which are observed for the first time in the Cymatosiraceae. The new genus contains four species, two of which are transferred from the genus Cymatosira, viz. Cymatosirella capensis comb. nov. and Cymatosirella minutissima comb. nov., and two which are new to science, viz. Cymatosirella benguelensis sp. nov. and Cymatosirella taylorii sp. nov. Cymatosirella capensis is chosen as the generitype. The new genus includes a group of very small taxa inhabiting the intertidal zone of the Atlantic Ocean with three species in South Africa and one in Europe. C. capensis was originally described by Giffen from Langebaan Lagoon (a shallow marine inlet in the southern part of Saldanha Bay, Western Cape Province), on the basis of light microscopy only, and has to date only been illustrated by line drawings. C. minutissima, so far only known from the Westerschelde estuary (The Netherlands), has previously been documented in more detail using both light and electron microscopy. Here, we present the results of detailed light and electron microscopical investigations of C. capensis, both from its original type material and from recently collected samples from the type locality and neighboring littoral areas in the Western Cape Province, and of the new species C. benguelensis and C. taylorii, also from Western Cape localities. All species are compared with similar small taxa belonging to the Cymatosiraceae, subfamily Extubocelluloideae.

Nematodes of the family Neotylenchidae (Tylenchida:Nematoda) from the Canadian high Arctic

1969 ◽  
Vol 47 (6) ◽  
pp. 1261-1268 ◽  
Author(s):  
R. H. Mulvey
Keyword(s):  
New Species ◽  
High Arctic ◽  
Nominal Species ◽  
Canadian High Arctic ◽  
Taxonomic Key ◽  
The Family ◽  
Two New Species ◽  
First Time

Six species of nematodes in the family Neotylenchidae, including two new species, are reported from the Canadian high Arctic for the first time. Hadrodenus n. gen. is established for species similar to Deladenus Thorne, 1941, but with a more anterior vulva and a postuterine sac. Deladenus saccatus Andrássy, 1954 is transferred to this genus. H. megacondylus n. sp. and Nothotylenchus attenuatus n. sp. are described and illustrated. Measurements and illustrations of the known species N. acris, N. acutus, N. danubialis, and Stictylus mucronatus, and a taxonomic key to the nominal species of these genera, are provided.

Bacterial leaf glands in Styrax camporum (Styracaceae): first report for the family

Botany ◽  
2014 ◽  
Vol 92 (5) ◽  
pp. 403-411 ◽  
Author(s):  
Silvia Rodrigues Machado ◽  
Simone de Pádua Teixeira ◽  
Tatiane Maria Rodrigues
Keyword(s):  
Developmental Stages ◽  
Light And Electron Microscopy ◽  
Secretory Cells ◽  
Intercellular Spaces ◽  
Secretory Body ◽  
Mature Leaves ◽  
The Family ◽  
Abundant Cytoplasm ◽  
Intact Surface ◽  
First Time

In this study, we recorded, for the first time, the occurrence of leaf glands in a member of Styracaceae and their association with bacteria. Samples of Styrax camporum Pohl shoot apices and leaves at different developmental stages were prepared according to the conventional techniques for light and electron microscopy. Glands are emergences constituted by epidermal and parenchyma cells and are differentiated into a secretory body on a short nonsecretory stalk supplied with phloem. Actively secreting glands occur from leaf primordia to mature leaves and produce mucilage that accumulates inside schizogenous intercellular spaces. The epidermal secretory cells have abundant cytoplasm rich in hyperactive dictyosomes, an extensive endoplasmic reticulum, and modified plastids. Bacteria enter the gland via the intact surface and proliferate in the intercellular spaces of the glands. Once inside the intercellular spaces of the glands, bacteria enter the cells owing to the weakening of the anticlinal and inner periclinal cell walls and by phagocytosis. Strands of actin filaments occur near the endocytical vesicles containing degenerating bacteria. Accumulations of phenolic compounds and callose could explain the absence of bacteria in the stalk cells. The presence of bacteria inside the leaf glands of S. camporum is a regular and cyclic trait. The significance of the bacteria (not yet identified) and the type of interaction between these two organisms remain unknown.

DIGAMASELLUS BERLESE, 1905, AND DENDROLAELAPS HALBERT, 1915, WITH DESCRIPTIONS OF NEW TAXA OF DIGAMASELLIDAE (ACARINA: MESOSTIGMATA)

1975 ◽  
Vol 107 (1) ◽  
pp. 1-43 ◽  
Author(s):  
Evert E. Lindquist
Keyword(s):  
Type Species ◽  
Sensu Stricto ◽  
Species Group ◽  
Nominal Species ◽  
Comprehensive Description ◽  
The Family ◽  
The Status ◽  
Relationship Of ◽  
New Synonymy ◽  
First Time

AbstractConceptual and nomenclatural problems of Digamasellus Berlese, 1905 and Dendrolaelaps Halbert, 1915 are reviewed. It is shown that Digamasellus punctum (Berlese, 1904) is conspecific with D. perpusillus Berlese, 1905, the type-species of Digamasellus Berlese, 1905 (new synonymy). Hence, the genus in which punctum is included must take the name Digamasellus.A new case is made for recognizing Digamasellus and Dendrolaelaps as distinct genera in the Digamasellidae. Two other genera of Digamasellidae are recognized, Dendroseius Karg, 1965 and a broadened concept of Longoseius Chant, 1961. Two new subgenera are proposed, Dendrolaelaspis in the genus Dendrolaelaps, and Longoseiulus in the genus Longoseius. Diagnoses, descriptions, and a key to these genera and subgenera of Digamasellidae, along with a comprehensive description of the family, are presented. The phylogenetic relationship of the Digamasellidae in the Rhodacaroidea, and some thoughts on phylogeny within the Digamasellidae are given.A second species of Digamasellus sensu stricto, D. australis, is described as new, and the female and male adults of the type-species of Longoseius, L. (L.) cuniculus Chant, are described for the first time. New combinations include: Dendrolaelaps (Dendrolaelaspis) orientalis (Bhattacharyya), Longoseius (Longoseiulus) longulus (Hirschmann), L. (L.) ornatus (Hirschmann), L. (L.) aberrans (Hirschmann), and L. (L.) brachypoda (Hurlbutt).The absence of the protonymphal seta, md, from the telotarsi of legs II to IV is noted as a singular deficiency in the leg setation of Longoseius cuniculus Chant. This seta is not known to be absent in any other species among the families of Gamasina.A paper published by Hirschmann while the present work was in press is considered in an addendum to this paper. The subgeneric name Dendrolaelaps (Tridendrolaelaps) Hirschmann, 1974 is an objective junior synonym of Digamasellus Berlese, 1905, and the latter also has priority over Dendrolaelaps Halbert, 1915 so long as both names are applied within the same genus. A lectotype is designated for the nominal species Digamasellus punctum (Berlese). The status of the subgenus Dendrolaelaps (Multidendrolaelaps) Hirschmann, 1974 is problematic, pending a more comprehensive diagnosis providing data sufficient to indicate whether this is a monophyletic group. The quadrisetus group is newly proposed for some of the species placed by Hirschmann in the armatus group of Multidendrolaelaps. Digamasellus badenhorsti (Ryke) is tentatively considered as the second known species of Dendroseius Karg. Hirschmann's opinion, that Longoseius Chant warrants no more than a species-group in Dendrolaelaps, is disputed.

SYSTEMATICS OF NEARCTIC SCYTHRIDIDAE (LEPIDOPTERA: GELECHIOIDEA): PHYLOGENY AND CLASSIFICATION OF SUPRASPECIFIC TAXA, WITH A REVIEW OF DESCRIBED SPECIES

1991 ◽  
Vol 123 (S160) ◽  
pp. 3-341 ◽  
Author(s):  
Jean-François Landry
Keyword(s):  
Type Species ◽  
Cladistic Analysis ◽  
Valid Species ◽  
Nominal Species ◽  
Undescribed Species ◽  
The Family ◽  
The Status ◽  
Unique Shape ◽  
Species Groups ◽  
First Time

AbstractGenera and previously described species of Nearctic Scythrididae are revised for the first time, based on the study of adult structures. About 90 percent of the Nearctic fauna known in collections consists of undescribed species. The supraspecific taxa treated in this work encompass less than half of the Nearctic species diversity. Only six new species are described, all within the largest and structurally most diverse genus. The status of all nominal species is revised. Valid species are redescribed and their features illustrated. General problems in the systematics of the Scythrididae are discussed. A description of adult features of the family Scythrididae is providad. Extra-limital genera are briefly reviewed. A key to the Nearctic genera and informal supraspecific lineages is provided.Six genera, including three new, are treated: Areniscythris Powell, 1976, Arotrura Walsingham, 1888, Asymmetrura gen. nov., Neoscythris gen. nov., Rhamphura gen. nov., and Scythris s. str. Hübner, [1825]. Areniscythris includes a single described species, Areniscythris brachypteris Powell, but is defined more broadly to account for a number of undescribed species. Arotrura is divided into nine informal species groups with the following included species: Arotrura atascosa sp. nov., Arotrura balli sp. nov., Arotrura divaricata (Braun) comb, nov., Arotrura eburnea Walsingham, Arotrura formidabilis sp. nov., Arotrura hymenata sp. nov., Arotrura longissima sp. nov., Arotrura oxyplecta (Meyrick) comb, nov., Arotrura powelli sp. nov., and Arotrura sponsella (Busck) comb. nov. Asymmetrura includes: Asymmetrura albilineata (Walsingham) comb. nov., Asymmetrura graminivorella (Braun) comb. nov., Asymmetrura impositella (Zeller) comb. nov. and type species, Asymmetrura matutella (Clemens) comb, nov., Asymmetrura reducta (Braun) comb, nov., and Asymmetrura scintillifera (Braun) comb. nov. Neoscythris includes: Neoscythris confinis (Braun) comb, nov., Neoscythris euthia (Walsingham) comb. nov., Neoscythris fissirostris (Meyrick) comb. nov. and type species, and Neoscythris planipenella (Chambers) comb. nov. Rhamphura includes: Rhamphura altisierrae (Keifer) comb, nov., Rhamphura ochristriata (Walsingham) comb. nov. and type species, Rhamphura perspicillella (Walsingham) comb. nov., Rhamphura suffusa (Walsingham) comb. nov., and the extra-limital Rhamphura immunis (Meyrick) comb. nov. from Peru. Scythris s. str. includes: Scythris immaculatella (Chambers) rev. stat., Scythris limbella (Fabricius), Scythris mixaula Meyrick, Scythris trivinctella (Zeller), and Scythris ypsilon Braun. A further eight species are phylogenetically distinct from Scythris s. str. but provisionally are only assigned to five informal monophyletic lineages until their cladistic relationships are more firmly established. These are: the Scythris basilaris lineage including Scythris basilaris (Zeller), Scythris eboracensis (Zeller), and Scythris fuscicomella (Clemens); the Scythris interrupta lineage including Scythris interrupta Braun; the Scythris inspersella lineage including Scythris inspersella (Hübner) and Scythris noricella (Zeller); the Scythris anthracina lineage including Scythris anthracina Braun; and the Scythris charon lineage including Scythris charon Meyrick. Three species are incertae sedis: Scythris inornatella (Chambers) comb, nov., Scythrispilosella (Zeller), and Scythris piratica Meyrick.Coleophora albacostella Chambers and Coleophora inornatella Chambers are transferred from the Coleophoridae. Scythris arizoniella (Kearfott) is transferred to the Coleophoridae [Coleophora arizoniella (Kearfott) comb. nov.].The following new synonymy is proposed: Colinita Busck, 1907 = Arotrura Walsingham, 1888; Gelechia aterrimella Walker, 1864 and Scythris epilobiella McDunnough, 1942 = Scythris inspersella [Hübner, (1817)]; Scythris magnatella Busck, 1904 = Scythris noricella (Zeller, 1843); Scythris pacifica McDunnough, 1927 = Scythris immaculatella (Chambers, 1875); Coleophora albacostella Chambers, 1875 and Scythris hemidictyas Meyrick, 1928 = Neoscythris planipenella (Chambers, 1875).A cladistic definition of the family is presented for the first time. The monophyly of the Scythrididae is supported by the following synapomorphies: very narrow ductus bursae, broad ductus seminalis anastomosed with the oviduct and the corpus bursae, lack of signum, unique shape of the apophyses of the metathoracic furca, tarsomeres 1–4 with two subapical spurs, aedeagus ankylosed, and origin of forewing veins R4 and R5 on a common stalk with R4 extended to the costa and R5 to the termen. Relationships of the Scythrididae within the Gelechioidea are discussed. Based on the cladistic analysis of 52 structural characters, phylogenetic relationships of supraspecific taxa are inferred. Two cladograms, one for the genera and one for the species groups of Arotrura, are presented and used in deriving the classification.

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