Dr. Ivan Magalhaes 🕷️
@6eyes8legs.bsky.social
researcher at Museo Argentino de Ciencias Naturales, CONICET • spider nerd • taxonomy, systematics, biogeography • he/él • views my own • 🇧🇷🇦🇷
Touring Western Australia
October 31, 2025 at 2:52 AM
Touring Western Australia
A dream come true: seeing a pelican spider (Archaeidae) in the field
Austrarchaea griswoldi, found in Eungella National Park, Queensland
Austrarchaea griswoldi, found in Eungella National Park, Queensland
October 21, 2025 at 7:55 AM
A dream come true: seeing a pelican spider (Archaeidae) in the field
Austrarchaea griswoldi, found in Eungella National Park, Queensland
Austrarchaea griswoldi, found in Eungella National Park, Queensland
Also with a nice biogeographic history, including a dispersal event from South America to Australia via Antarctica around ~40 million years ago:
September 29, 2025 at 6:39 PM
Also with a nice biogeographic history, including a dispersal event from South America to Australia via Antarctica around ~40 million years ago:
Beautiful work by Ortiz et al. on the phylogenomics of zodariid spiders. Nice way of summarizing topological conflict among datasets and analyses!
resjournals.onlinelibrary.wiley.com/doi/10.1111/...
resjournals.onlinelibrary.wiley.com/doi/10.1111/...
September 29, 2025 at 6:27 PM
Beautiful work by Ortiz et al. on the phylogenomics of zodariid spiders. Nice way of summarizing topological conflict among datasets and analyses!
resjournals.onlinelibrary.wiley.com/doi/10.1111/...
resjournals.onlinelibrary.wiley.com/doi/10.1111/...
Monjaraz-Ruedas et al. on genetic diversity of several mygalomorph species. Body size and ecological niche do not predict genetic diversity or structure, because ALL species are highly structured and isolated by distance. Mygals don't like moving...
onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com/doi/10.1111/...
September 24, 2025 at 6:00 PM
Monjaraz-Ruedas et al. on genetic diversity of several mygalomorph species. Body size and ecological niche do not predict genetic diversity or structure, because ALL species are highly structured and isolated by distance. Mygals don't like moving...
onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com/doi/10.1111/...
Nice paper by Lima et al. on the origins of the endemic birds of the Caatinga dry forests. They have been arriving since 12 million years ago, mostly from nearby dry/open areas (niche conservatism!). Interestingly, the most threatened birds are generally the older endemics... doi.org/10.1111/jbi....
September 2, 2025 at 8:07 PM
Nice paper by Lima et al. on the origins of the endemic birds of the Caatinga dry forests. They have been arriving since 12 million years ago, mostly from nearby dry/open areas (niche conservatism!). Interestingly, the most threatened birds are generally the older endemics... doi.org/10.1111/jbi....
Loxosceles galianoa, una nueva especie de araña del noroeste árido argentino. Bautizada en honor a María Elena Galiano, es pariente cercana de L. laeta, pero vive en ambientes naturales. En el artículo, también discutimos la evolución de la genitalia femenina en Loxosceles.
doi.org/10.1071/IS24...
doi.org/10.1071/IS24...
May 13, 2025 at 6:15 PM
Loxosceles galianoa, una nueva especie de araña del noroeste árido argentino. Bautizada en honor a María Elena Galiano, es pariente cercana de L. laeta, pero vive en ambientes naturales. En el artículo, también discutimos la evolución de la genitalia femenina en Loxosceles.
doi.org/10.1071/IS24...
doi.org/10.1071/IS24...
Aspidolasius branicki, the cat-face spider
March 5, 2025 at 8:47 PM
Aspidolasius branicki, the cat-face spider
female spider genitalia seen in a scanning electron microscope
February 27, 2025 at 5:13 PM
female spider genitalia seen in a scanning electron microscope
black & gold Oxyopes from Entre Ríos, Argentina
February 10, 2025 at 6:18 PM
black & gold Oxyopes from Entre Ríos, Argentina
The process of drawing a spider male genitalia for taxonomic description. ~2:30 hours in total (only the filling; the lines in the camera lucida might have taken an additional hour or so).
January 31, 2025 at 9:53 PM
The process of drawing a spider male genitalia for taxonomic description. ~2:30 hours in total (only the filling; the lines in the camera lucida might have taken an additional hour or so).
Su nombre, elegido por voto popular, honra a Rita Schiapelli, pionera en aracnología, celebrando su colaboración con Berta Gerschman de Pikelin, a quien el género fue dedicado.
El artículo se puede leer gratuitamente desde la web del MACN:
revista.macn.gob.ar/ojs/index.ph...
El artículo se puede leer gratuitamente desde la web del MACN:
revista.macn.gob.ar/ojs/index.ph...
December 27, 2024 at 6:44 PM
Su nombre, elegido por voto popular, honra a Rita Schiapelli, pionera en aracnología, celebrando su colaboración con Berta Gerschman de Pikelin, a quien el género fue dedicado.
El artículo se puede leer gratuitamente desde la web del MACN:
revista.macn.gob.ar/ojs/index.ph...
El artículo se puede leer gratuitamente desde la web del MACN:
revista.macn.gob.ar/ojs/index.ph...
Con gente del MACN, CEPAVE y Uruguay, recién describimos la araña Pikelinia schiapelliae (Filistatidae), hallada en arenales de Argentina y Uruguay. Muy simpática!
(foto 1 por Damián Hagopián)
(foto 1 por Damián Hagopián)
December 27, 2024 at 6:31 PM
Con gente del MACN, CEPAVE y Uruguay, recién describimos la araña Pikelinia schiapelliae (Filistatidae), hallada en arenales de Argentina y Uruguay. Muy simpática!
(foto 1 por Damián Hagopián)
(foto 1 por Damián Hagopián)
Actinopus cordobensis, a trapdoor spider from Argentina.
December 2, 2024 at 8:02 PM
Actinopus cordobensis, a trapdoor spider from Argentina.
que fotaça!! esse ataque da aranha é para enrolar a presa super rápido usando uma glândula de seda modificada que só essa família tem.
as "bisnaguinhas de confeiteiro" finas são por onde saem os fios de seda comuns, e as grossas são por onde sai uma substância pegajosa que usam pra enrolar a presa
as "bisnaguinhas de confeiteiro" finas são por onde saem os fios de seda comuns, e as grossas são por onde sai uma substância pegajosa que usam pra enrolar a presa
September 26, 2024 at 4:57 PM
que fotaça!! esse ataque da aranha é para enrolar a presa super rápido usando uma glândula de seda modificada que só essa família tem.
as "bisnaguinhas de confeiteiro" finas são por onde saem os fios de seda comuns, e as grossas são por onde sai uma substância pegajosa que usam pra enrolar a presa
as "bisnaguinhas de confeiteiro" finas são por onde saem os fios de seda comuns, e as grossas são por onde sai uma substância pegajosa que usam pra enrolar a presa
estou tentando encontrar meus contatos da outra rede por aqui para seguir. quem anda por aqui?
Pavocosa gallopavo (Lycosidae) usando seus bebês como chapéu para chamar atenção
Pavocosa gallopavo (Lycosidae) usando seus bebês como chapéu para chamar atenção
September 11, 2024 at 6:26 PM
estou tentando encontrar meus contatos da outra rede por aqui para seguir. quem anda por aqui?
Pavocosa gallopavo (Lycosidae) usando seus bebês como chapéu para chamar atenção
Pavocosa gallopavo (Lycosidae) usando seus bebês como chapéu para chamar atenção
spider alignment chart. thanks to all the photographers.
September 18, 2023 at 8:03 PM
spider alignment chart. thanks to all the photographers.
7 months later I upload a few photos of my last fieldwork to my website: ilfmagalhaes.wixsite.com/home/fieldwork
Titanattus andinus, a salticid that looks like a weird teenager, for attention
Titanattus andinus, a salticid that looks like a weird teenager, for attention
September 14, 2023 at 9:13 PM
7 months later I upload a few photos of my last fieldwork to my website: ilfmagalhaes.wixsite.com/home/fieldwork
Titanattus andinus, a salticid that looks like a weird teenager, for attention
Titanattus andinus, a salticid that looks like a weird teenager, for attention
Sad to hear about the passing of Dr. Mike Gray from the Australian Museum. Mike was the first to do a phylogeny of Filistatidae, the family I studied for my PhD. Early during my studies I started corresponding with him and he was always very kind and thoughtful.
Photo from his obituary, by H. Smith
Photo from his obituary, by H. Smith
August 23, 2023 at 6:57 PM
Sad to hear about the passing of Dr. Mike Gray from the Australian Museum. Mike was the first to do a phylogeny of Filistatidae, the family I studied for my PhD. Early during my studies I started corresponding with him and he was always very kind and thoughtful.
Photo from his obituary, by H. Smith
Photo from his obituary, by H. Smith
This cool spider is Galianoella leucostigma, the only member of Gallieniellidae in America—all other spiders in the family live in southern Africa and Madagascar.
This species only eats ants, and its name honors María Elena Galiano, one of the first and most important arachnologists in Argentina.
This species only eats ants, and its name honors María Elena Galiano, one of the first and most important arachnologists in Argentina.
July 31, 2023 at 6:50 PM
This cool spider is Galianoella leucostigma, the only member of Gallieniellidae in America—all other spiders in the family live in southern Africa and Madagascar.
This species only eats ants, and its name honors María Elena Galiano, one of the first and most important arachnologists in Argentina.
This species only eats ants, and its name honors María Elena Galiano, one of the first and most important arachnologists in Argentina.
I'm here for the spiders
July 26, 2023 at 5:18 PM
I'm here for the spiders