Cristian Grismado

• Dr.
• Profesional principal CPA Conicet at Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"

We revise the spider genus Cybaeolus Simon, 1884, endemic to Chile and Argentina, including three species, Cybaeolus delfini (Simon, 1904), Cybaeolus pusillus Simon, 1884, and Cybaeolus rastellus (Roth, 1967). The genus Clitistes Simon, 1902 is synonymized with Cybaeolus, and its type species Clitistes velutinus Simon, 1902 is synonymized with Cyba...

We present a systematic study of the South American genus Ciniflella Mello-Leitão, 1921, endemic to southeastern Brazil and northeastern Argentina. The genus can be distinguished from other cribellate members of Zoropsidae by the cribellum with two small, widely spaced patches of spigots, and the male palpal retrolateral tibial apophysis with regul...

The identification of spider species presents many challenges, since in most cases the characters used are from genital structures that are only fully developed in the adult stage, hence the identification of immatures is most often not possible. Additionally, these structures usually also present some intra-specific variability, which in some case...

The Avellaneda and Quilmes coastal biocorridor is part of one of the areas with the greatest diversity of plant and animal species in the Buenos Aires Metropolitan Area (AMBA). There are two main factors that can explain these high levels of biodiversity: its geographical location and its environmental heterogeneity. The corridor is geographically...

Arachnida La selva en galería, pastizales y bosques del Corredor costero de Avellaneda y Quilmes son hábitats que albergan una interesante diversidad y resultan propicios para un grupo muy importante de invertebrados: los arácnidos. Se trata de artrópodos de hábitos terrestres, grupo dentro del cual se destacan animales tan conocidos como los escor...

Capítulo 15 → Inventario Algunas cuestiones básicas de nomenclatura biológica. Una especie desde el punto de vista biológico es un conjunto de organismos que pueden reproducirse entre sí y dejar descendencia fértil. Para poder comunicarse correctamente los científicos utilizan un sistema de cla-sificación jerárquico propuesto por Carlos Linneo, un...

Batesian mimicry is an impressive example of convergent evolution driven by predation. However, the observation that many mimics only superficially resemble their models despite strong selective pressures is an apparent paradox. Here, we tested whether inaccurate mimicry represents an optimized or transitional stage at the macro-evolutionary scale...

Compilation of the taxa described by the members of the MACN during 2022.

The genus Coenypha Simon, 1895 is composed of species distributed on the Southern Andean Region and Patagonia, and presents remarkable somatic morphologies, such as the flattened habitus, enlarged femora I, and a wide opisthosoma. Molecular and morphology-based phylogenies have revealed the close relationship of this genus with sympatric species pr...

Abstract: The study of some museum collections with materials collected in India resulted in the descriptions of a new species of the genus Paramolotra Tong & Li from West Bengal (the genus was previously known only from China), as well as a new species of Aprusia Simon, and also the female of Aprusia kerala Grismado & Deeleman, from the Western Gh...

A faunistic survey in the Maule region in central-southern Chile resulted in the discovery and description of a new species of the spider genus Osornolobus: O. violetaparra n. sp., based on males collected using pitfall traps in the province of Talca. This is the northernmost record of the genus in Chile, previously known from Ñuble to Magallanes.

Los bosques australes de Argentina están en su mayoría representados por especies latifoliadas del género Nothofagus, conformando bosques puros y mixtos. Existen pocos estudios ecológicos sobre la araneofauna de estos bosques. En este trabajo se analizó la diversidad (abundancia, riqueza, índices de diversidad y composición) de arañas colectadas en...

Fire is one of the main disturbances in northeastern Patagonia. Wildfires are becoming more frequent and severe, threatening the sustainability of local ecosystems. Arachnids respond markedly to environmental modifications and can regulate processes linked to lower trophic levels. Assessing changes in arachnid diversity is useful to understand the...

The systematics of Philodromidae is far from complete, especially for the Neotropical genera. Among these, PetrichusSimon, 1886 is a poorly known genus restricted to arid and semi-arid environments of South America. In this work, we performed a total-evidence analysis to assess the phylogenetic relationships of Petrichus and revised the taxonomy. P...

“Pioneers: Women Scientists of the Museo Argentino de Ciencias Naturales’’ is a cycle that began in March 2019 within the framework of the International Women’s Day. It began as an initiative of a self-convened group of working women of the Museum, with the aim of recognizing and honoring the trajectories of the first women who carried out scientif...

The present corrigendum corrects errors that occured in Machado M., Viecelli R., Guzati C., Grismado C.J. & Teixeira R.A. 2021. Kryptochroma: a new genus of bark-dwelling crab spiders (Araneae, Thomisidae). European Journal of Taxonomy 778: 26–70. https://doi.org/10.5852/ejt.2021.778.1565

A recent phylogenetic analysis has shown that the genus Stephanopis comprises several different lineages of bark-dweller crab spiders. The ones with South American distribution that present a close relationship with other Neotropical genera like Epicadus, Onocolus, Rejanellus and Epicadinus were recovered in a single clade, with good support and st...

1. Major floods of riparian and grassland habitats may lead to a shift in the availability of resources (e.g., food, space) that produces cascading effects on the organisms that rely on it. After flooding occurs, particularly in natural grasslands or agricultural fields, massive aggregative spider webs are occasionally observed. However, given it i...

The genus Meriola Banks currently includes 24 known species of spiders distributed across America, especially in southern South America. They have a nearly straight and narrower posterior eye row compared to other American genera of Trachelidae, and elongated and sharply tipped ventral leg cuspules. The study of specimens of Meriola available in co...

Variable retention mitigates negative effects of traditional harvesting on biodiversity, maintaining legacies in harvested forests as habitat for sensitive species, and generating other habitats for early-seral species. Their assessment, including drivers, has a high concern for society. Likewise, species association with ecosystems in the landscap...

Dos arañas exóticas se reportan por primera vez en Argentina: Ozyptila praticola (C.L. Koch) (Thomisidae) y Microctenonyx subitaneus (O. Pickard-Cambridge) (Linyphiidae), constituyendo la primera de ellas el primer registro conocido para el hemisferio sur. Los especímenes fueron hallados en hojarasca y bajo corteza de árboles en ambientes modificad...

The new genus and species Myrmecicultor chihuahuensis Ramírez, Grismado, and Ubick is described and proposed as the type of the new family, Myrmecicultoridae Ramírez, Grismado, and Ubick. The species is ecribellate, with entelegyne genitalia, two tarsal claws, without claw tufts, and the males have a retrolateral palpal tibial apophysis. Some morph...

ABSTRACT. The Malagasy species of the filistatid spider genus Andoharano Lehtinen are revised. The four previously known species, all from caves, are redescribed and have their type material illustrated. The paratypes of A. milloti Legendre are not conspecific with its holotype and are herein described as A. rollardae sp. nov. The first epigean rep...

We present an annotated taxonomic check-list, the result of a spider fauna survey in the Municipal Natural Historical Reserve and Wildlife Refuge Vuelta de Obligado, San Pedro, Buenos Aires province, situated in the Middle Parana River Delta region, in Argentina; the material was collected by hand and by means of foliage beating, sweeping nets, and...

A new genus of gnaphosid spiders, Almafuerte, gen. nov., is described for seven species from Southern South America. The new genus is diagnosed by a conspicuous retrolateral tegular projection on the male palp, and by having three teeth on the cheliceral retromargin. It comprises six species from Argentina, A. peripampasica sp. nov. (type species),...

The taxonomy of the poorly known South American goblin spider genus Birabenella Grismado (Araneae: Oonopidae) is updated in light of recently collected material. Three new species are described: B. kamanchaca, from northern Chile, B. portai, from northwestern Argentina, and B. chincha, from southern Peru, where the genus is reported for the first t...

We present a phylogenetic analysis of spiders using a dataset of 932 spider species, representing 115 families (only the family Synaphridae is unrepresented), 700 known genera, and additional representatives of 26 unidentified or undescribed genera. Eleven genera of the orders Amblypygi, Palpigradi, Schizomida and Uropygi are included as outgroups....

A new species of the zodariid Neotropical genus Epicratinus Jocqué & Baert, 2005, E. santacruz, is described from Santa Cruz Department, Bolivia. This is the fifth species described for the genus, and the first zodariid known from Bolivia.

A faunistic survey on Chañaral Island, Atacama, near the northern Pacific coast of Chile, allowed the discovery and description of a new species of the spider genus Cyrioctea: C. islachanaral sp. nov., based on females collected by pitfall traps. Strikingly, this new species shares morphological characters with some Southern African representatives...

Three new species of the uloborid genus Orinomana Strand, O. penelope n. sp.from Ecuador, O. viracocha n. sp.from Peru, and O. florezi n. sp.from Colombia, are described. Additionally, the male of O. ascha Grismado, from Northwestern Argentina, is described for the first time. This material includes the first males known of the genus, providing dia...

Two new species of Otiothops MacLeay, 1839 (O. atalaia sp. n. and O. goytacaz sp. n.), a new species of Fernandezina Birabén, 1951 (F. jurubatiba sp. n.) as well as the female of F. tijuca Ramírez & Grismado, 1996 are described from the Atlantic Rainforest of southeastern Brazil, in the state of Rio de Janeiro. Scanning electron microscope images o...

Two new genera in the family Lycosidae Sundevall, 1833 from Argentina are proposed. Lobizon gen. nov. comprises five species: Lobizon corondaensis (Mello-Leitão, 1941) comb. nov. (type species), L. minor (Mello Leitão, 1941) comb. nov., and L. humilis (Mello-Leitão, 1944) comb. nov., all these with a wide distribution in Argentina, and two new spec...

A new species of the spider genus Castianeira (Araneae: Corinnidae) from Argentina, C. coquito, is described on the basis of male and female specimens collected in northeastern Buenos Aires Province and the Ciudad Autónoma de Buenos Aires, Argentina. This new species is characterized by its diminutive size and by the very globose copulatory bulb wi...

A new species of the hard-bodied oonopid genus Trilacuna Tong & Li is described from a cave in Kohgiluyeh and BoyerAhmad Province, southwestern Iran. Trilacuna qarzi sp. nov. is the first troglobiont species known of the genus, and is also the fifth oonopid species to be reported from Iran. Relationships of this new species are briefly discussed in...

The male of the Chilean zodariid spider Cybaeodamus lycosoides (Nicolet, 1849) is described and illustrated for the first time. New records for this species are provided, including the first from Peru, as also new localities from Argentina for C. meridionalis Lise, Ott & Rodrigues.

A new genus of soft-bodied oonopids, Gradunguloonops, is established for a group of goblin spiders found in the Amazonian rainforests of northern South America. Members of this genus differ from other oonopids in that the proclaw of tarsi I and II is notably larger than the corresponding retroclaw, a putative synapomorphy of the group. Gradunguloon...

A new genus of soft-bodied oonopids, Gradunguloonops, is established for a group of goblin spiders found in the Amazonian rainforests of northern South America. Members of this genus differ from other oonopids in that the proclaw of tarsi I and II is notably larger than the corresponding retroclaw, a putative synapomorphy of the group. Gradunguloon...

The male of the Chilean zodariid spider Cybaeodamus lycosoides (Nicolet, 1849) is described and illustrated for the first time. New records for this species are provided, including the first from Peru, as also new localities from Argentina for C. meridionalis Lise, Ott & Rodrigues.

Verita williamsi, new genus and species (Araneae, Gnaphosidae) is described from specimens recently collected in Northern Santa Fe Province, Argentina. The peculiar combination of having only two piriform gland spigots, aligned setae on the leg scopulae, and anterior lateral spinnerets not widely spaced suggests that the species is probably a close...

The present paper compiles taxonomic information of spider species from Costanera Sur Ecological Reserve (RECS), Buenos Aires City, Argentina. The list is composed by published records, as well as data from new samplings obtained during the last eight years and other material deposited in the collection of the Museo Argentino de Ciencias Naturales...

Resumen Se proporciona un breve resumen introductorio de las características generales de morfología y biología del orden Araneae, poniendo énfasis en sistemática, taxonomía y diversidad de las especies presentes en Argentina. Araneae es uno de los órdenes megadiver-sos del reino Animal y está representado en todo el mundo por 112 familias, unos 3...

We revise the relationships of the spider genus Cryptothele after reexamination of the morphology of the spinnerets, leg tarsal claws and maxillae with scanning electron microscopy. Cryptothele species have a particular conformation of the spinning field of the anterior lateral spigots that is typical of zodariids and close relatives: the field of...

The taxonomy of the genus Latonigena Simon is updated after the study of the collection of the Museo Argentino de Ciencias Naturales (Buenos Aires). Two new species are described: L. pampa, n. sp., from Buenos Aires Province, Argentina, and L. pittieri, n. sp., from Aragua, Venezuela (the first record of a member of this genus from that country). T...

A new species of the genus Neotrops (Araneae: Oonopidae) from Colombia, N. ramirezi, is described on the basis of male and female specimens collected in Yotoco Natural Reserve (Valle de Cauca). It is the third species of the genus reported for the country. Una nueva especie del género Neotrops (Araneae: Oonopidae) de Colombia, N. ramirezi se descri...

The study of many museum specimens of goblin spiders from the Himalayan range and neighboring countries allows for the description of new taxa of the family Oonopidae. The genus Dysderoides Fage is taxonomically reviewed. It comprises small, blind, loricate troglobitic spiders: the type species (D. typhlos Fage, from India) and at least five new sp...

Resumen Se presenta una breve síntesis del conocimiento de las especies argentinas de las familias de arañas migalomorfas agrupadas en el clado Rastelloidina (Actinopodidae, Migidae, Idiopidae y Cyrtaucheniidae), conocidas usualmente como “arañas albañiles”. Se trata de arañas robustas, sedentarias, de patas relativamente cortas y fuertemente armad...

Resumen Se revisa el conocimiento taxonómico de las familias de arañas migalomorfas Nemesiidae y Microstigmatidae en la fauna argentina. Ambas comparten un cefalotórax más bien bajo, uñas tarsales superiores anchas y bipectinadas, uña del palpo de la hembra con dientes en el promargen, y las hileras más cortas que en Dipluridae. Las Microstigmatida...

Resumen Se revisa el conocimiento taxonómico de la familia Austrochilidae en la Argentina, un grupo de arañas araneomorfas de considerable tamaño, cribeladas, con ocho ojos, tejedoras de grandes telas en forma de sábana con un refugio tubular. Se trata de un grupo relictual, registrado únicamente en los bosques australes de Chile, Argentina y Tasma...

Resumen Las familias de arañas Mecicobothriidae, Hexathelidae y Dipluridae comprenden arañas migalomorfas tejedoras de telas en forma de sábana con embudos, de tamaño variable y similares superficialmente por la presencia de hileras laterales largas a muy largas. Las Mecicobothriidae (cuatro géneros y nueve especies descriptas, siete de ellas exclu...

Resumen Se revisa el conocimiento taxonómico de la familia Diguetidae en la Argentina, un grupo de arañas araneomorfas de mediano tamaño, haploginas, ecribeladas, con seis ojos, típicas de ambientes áridos. Es un pequeño grupo (dos géneros, 13 especies) exclusivamente americano, del cual la única especie conocida en Argentina es Diguetia catamarque...

Resumen La superfamilia Dysderoidea incluye arañas araneomorfas haploginas, ecribeladas, con seis ojos y espiráculos traqueales en posición avanzada (contiguos al surco epigástrico), y cuya principal característica diagnóstica es la de poseer un receptáculo posterior en los genitales femeninos, lo que constituye un carácter sinapomórfico. Está comp...

A new genus of soft-bodied oonopids, Neotrops, is established for a large assemblage of goblin spiders found in all tropical and subtropical areas of the Neotropical region, from Panama to Uruguay and central Argentina. Members of Neotrops have spinose forelegs, and share a general palpal morphology with those of Heteroonops Dalmas, but have a prol...

The male of Latonigena auricomis Simon, 1893 is described for the first time and the female is redescribed. New records are provided for Argentina, Brazil and Uruguay. Notes on the natural history and a potential distribution model of the species are presented in the Neotropical Region.

The araneomorph spider family Palpimanidae is reported from Bolivia for the first time. Two new species: Otiothops kathiae and O. naokii are described and illustrated based on specimens recently collected in Santa Cruz Department. Additionally, Fernandezina pulchra Birabén, 1951 previously known only from Formosa, in northern Argentina, is newly re...

The Neotropical genus Zimiromus Banks, 1914 was first revised by Platnick & Shadab (1976) and comprised at that time 21 species distributed from Mexico to Brazil. It was diagnosed by the combined presence of a strongly procurved posterior eye row (Figs. 5, 6), dentate tarsal claws, tarsi without false articulations, three promarginal cheliceral tee...

Based on a survey of a wide variety of oonopid genera and outgroups, we hypothesize new synapomorphies uniting the Oonopidae (minus the South African genus Calculus Purcell, which is transferred to the Orsolobidae). The groundplan of the tarsal organ in Oonopidae is hypothe sized to be an exposed organ with a distinctive, longitudinal ridge origina...

The south Asian goblin spider genus Aprusia Simon (Araneae: Oonopidae) consists of five species and is found in southwestern India and Sri Lanka. Although the type species A. strenuus Simon is known only from two juvenile syntypes, new topotypical material from Sri Lanka allowed a redefinition of the genus and species. Ischnothyreus vestigator Simo...

Resumen -Se efectuó un relevamiento de la fauna de arañas (Arachnida: Araneae) en la Reserva Natural Otamendi, en el nordeste de la Provincia de Buenos Aires. Se recolectó mediante diversos métodos durante seis meses, entre Febrero y Julio de 2007. Se obtuvieron 2916 especímenes de 158 morfoespecies pertenecientes a 32 familias. Dentro del material...

A new genus, Birabenella, is erected for three new soft-bodied oonopid species from Coquimbo Region, Chile (B. homonota, the type species, B. elqui, and B. pizarroi) and one from Catamarca Province, Argentina: B. argentina (Birabén, 1955), here transferred from Oonopinus Simon. The new genus is supported and diagnosed by the tarsal claws with one r...

The male of Oonops nigromaculatus Mello-Leitão 1944 is described for the first time and the female is redescribed from recently collected specimens. New records from Argentina and Uruguay are provided.

3 Abstract The genus Stedocys was known only from males. Here we describe the first females of the genus. Stedocys genitalia are atypical for Scytodidae. Males are distinguished by having the papal tarsus subequal or smaller than the tegulum, not prolonged apically, without prolateral blunt macrosetae; the tegulum long, inserted apically on the tar...

The genus Stedocys was known only from males. Here we describe the first females of the genus. Stedocys genitalia are atypical for Scytodidae. Males are distinguished by having the papal tarsus subequal or smaller than the tegulum, not prolonged apically, without prolateral blunt macrosetae; the tegulum long, inserted apically on the tarsus; embolu...

Two new genera in the family Lycosidae Sundevall, 1833 from Argentina are proposed. Lobizon gen. nov. comprises five species: Lobizon corondaensis (Mello-Leitão, 1941) comb. nov. (type species), L. minor (Mello Leitão, 1941) comb. nov., and L. humilis (Mello-Leitão, 1944) comb. nov., all these with a wide distribution in Argentina, and two new spec...

Labarque, Facundo M., Grismado, Cristian J. (2009): Description of a new species of armored spider from Myanmar (Araneae: Tetrablemmidae). Zootaxa 2143: 55-58, DOI: 10.5281/zenodo.188615

The Tetrablemmidae is a family of small to very small haplogyne, ecribellate, three-clawed spiders characterized mainly by the complex pattern of abdominal scuta (with dorsal, lateral and ventral plates) which justifies their common name “armoured spiders” (Shear 1978, Lehtinen 1981, Jocqué & Dippenaar-Schoeman 2006). They have a dorsal shield of p...

Austrochilus forsteri new species, (Araneae, Austrochilidae, Austrochilinae) is described and illustrated based on specimens collected in Malleco Province, Chile. RESUMEN Austrochilus forsteri, nueva especie, (Araneae, Austrochilidae, Austrochilinae) es descripta e ilustrada sobre la base de especímenes colectados en la provincia de Malleco, Chile.

Sybota atlantica nueva especie es descripta para la costa atlántica de la provincia de Buenos Aires, Argentina. La morfología genital y cefálica sugiere que la nueva especie forma un grupo monofilético con S. mendozae Opell 1979 y S. rana (Mello-Leitão 1941). Los órganos genitales femeninos muestran un inusual grado de enteleginia, con los conducto...

We report on the natural history and web building behavior of the South American austrochilids Thaida peculiaris and Austrochilus forsteri, relatively basal lineages within Araneomorphae. Species of these two cribellate genera construct large, two-dimensional sheet webs with a funnel retreat. When combing cribellate silk, austrochilids use both fou...

Two new genera in the family Lycosidae Sundevall, 1833 from Argentina are proposed. Lobizon gen. nov. comprises five species: Lobizon corondaensis (Mello-Leitão, 1941) comb. nov. (type species), L. minor (Mello Leitão, 1941) comb. nov., and L. humilis (Mello-Leitão, 1944) comb. nov., all these with a wide distribution in Argentina, and two new spec...

The male of Oonops nigromaculatus Mello-Leitão 1944 is described for the first time and the female is redescribed from recently collected specimens. New records from Argentina and Uruguay are provided. Resumen: Primera descripción del macho de Oonops nigromaculatus Mello-Leitão, 1944 (Araneae: Oonopidae) con la redescripción de la hembra y nuevos r...

FIGURES 1 – 2. Tetrablemma thamin n. sp. Genitalia. 1 male right palp, retrolateral view (ARAMR 000120); 2 female vulva, dorsal view (ARAMR 000125). Abbreviations: (ARP) acute retrolateral processes, (B) bulb, (E) embolus, (IVP) inner vulval plate, (PAP) pre-anal plate, (PVP) postgenital ventral plate, (S) seminal receptacle, (T) tibia, (Tf) transv...

FIGURES 3 ─ 4. Tetrablemma thamin n. sp. Genitalia. 3 male left palp, embolus detail, dorsal view (ARAMR 000120); 4 female genitalia, detail of genital opening, ventral view (ARAMR 000838). Abbreviations: (ARP) acute retrolateral processes, (SO) subterminal outlet. Scale bars: 150 µm; 220 µm.

FIGURES 6 – 11. Tetrablemma thamin n. sp. Preserved specimens. 6 – 9 male holotype (ARAMR 000301) (6 dorsal, 7 ventral habitus, 8 prosoma lateral, * in horn, 9 ditto, frontal). 10 – 11 female paratype (ARAMR 000300) (10 dorsal, 11 ventral habitus). Abbreviations: (PVP) postgenital ventral plate. Scale bars: 6 – 7 = 0.5 mm, 8 – 11 = 0.25 mm.

FIGURES 1 – 2. Lobizon gen. nov., photographs of life specimens. 1, Lobizon ojangureni sp. nov., female from Parque Nacional Calilegua; 2, Lobizon corondaensis (Mello-Leitão), male from San Rafael.

FIGURES 39 – 44. Genitalia of Lobizon humilis (Mello-Leitão). 39 – 40, female from Reserva Natural Otamendi (MACN-Ar 16239); 41, male from Don Torcuato (MACN-Ar 16277); 42, female from Las Gamas (MACN-Ar 16275); 43 – 44, male from Don Torcuato (MACN-Ar 16268); 39, epigyne, ventral; 40, 42, vulvae, cleared, dorsal; 41, dissected embolic division (as...

FIGURES 49 – 54. Lobizon ojangureni sp. nov., habitus of preserved specimens from Parque Nacional Calilegua. 49, 51, 53, female paratype (MACN-Ar 18318); 50, 52, 54, male holotype (MACN-Ar 18319); 49 – 50, dorsal; 51 – 52, lateral; 53 – 54, ventral.

FIGURES 65 – 68. Lobizon otamendi sp. nov. 65, female paratype (MACN-Ar 16307), epigyne, ventral; 66, female from Caseros (MACN-Ar 16308), vulva, cleared, dorsal; 67 – 68, male holotype (MACN-Ar 16309); 67, left palp, retrolateral, 68, same, ventral.

FIGURES 83, 84. Geographic distribution of Lobizon gen. nov. 83, Lobizon corondaensis (Mello-Leitão), 84, Lobizon minor (Mello-Leitão).

FIGURES 85, 86. Geographic distribution of Navira gen. nov. and Lobizon gen. nov. 85, Lobizon humilis (Mello- Leitão), 86, Lobizon ojangureni sp. nov. (triangles), L. otamendi sp. nov. (squares) and Navira naguan gen. nov. sp. nov. (circles).

FIGURES 9 – 14. Female genitalia of Lobizon gen. nov. and Navira gen. nov .. 9 – 10, L. corondaensis (Mello-Leitão) from Parque Nacional Chaco, Laguna Carpincho (MACN-Ar 13618); 11 – 12, L. humilis (Mello-Leitão) from Reserva Natural Otamendi (MACN-Ar 16240); 13 – 14, Navira naguan sp. nov. from Bosque Alegre, 20 km de Carlos Paz (MACN-Ar 16282); 9...

FIGURES 27 – 32. Lobizon corondaensis (Mello-Leitão), variability. 27 – 31, epigynes of five specimens collected together in Parque Nacional Chaco (MACN-Ar 13618); 32, male from Suipacha (MACN-Ar 16220), showing the whitish setae on cephalic area.

FIGURES 33 – 38. Lobizon humilis (Mello-Leitão), habitus of preserved specimens from Reserva Natural Otamendi. 33, 35, 37, female (MACN-Ar 16239); 34, 36, 38, male (MACN-Ar 16257); 33 – 34, dorsal; 35 – 36, lateral; 37 – 38, ventral.

FIGURES 59 – 64. Lobizon otamendi sp. nov., habitus of preserved specimens from Reserva Natural Otamendi. 59, 61, 63, female paratype (MACN-Ar 16307); 60, 62, 64, male holotype (MACN-Ar 16309); 59 – 60, dorsal; 61 – 62, lateral; 63 – 64, ventral.

FIGURES 69 – 74. Navira naguan sp. nov., habitus of preserved specimens from Merlo. 69, 71, female paratype (MACN-Ar 16280); 70, 72 – 74, male holotype (MACN-Ar 16281); 69 – 70, dorsal; 71 – 72, ventral; 74, lateral; 73, detail of the ocular area and the clypeal condyle.