Nathan K. Lujan
@DrNathanLujan
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Assoc. Curator of Fishes @ROMtoronto | Asst. Professor @eebtoronto | River Guardian: https://t.co/qGeA50OQCC | @IUCN FW Fish Specialist Group | IG: @potamophile
Toronto, ON
Joined October 2014
Come find me at the other place for more fish, fieldwork, and natural history museum content.
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RT @UNBiodiversity: 🚨Insects are disappearing and it is a huge biodiversity loss! 🦋🐝🪰 Find out more about the global threats to insects.…
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Among the programs affected by the possible freeze of American foreign aid are those that establish and support overseas national parks and conservation areas.
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At 1432 valid species, Gobiidae has a long ways to go to catch up with cichlids and carps.
@DrNathanLujan So many unknown gobies from mesophotic reefs! 🪸
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Catalog of Fishes reports a current total of 1786 valid species in Cyprinidae, not including the 702 valid species of Leuciscidae.
@DrNathanLujan Is that true post Leucisicidae split? I have to imagine Cyprinidae is no longer #1 after losing hundreds of species
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Finally having the first lab meeting of 2025, with presentations on Acestrorhamphidae alpha taxonomy from Tiago Faria and 3D shape variation in loricariid opercles from Mikhail Clare!
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Catalog of Fishes is a more rigorously curated database, and is the reference researchers interested in fish systematics should use. It’s not perfect, but we’re lucky to have such a resource for Ichthyology - it’s better than is available for any other vertebrate group.
@DrNathanLujan Do you think the 1931 species listed here are not all valid?
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Actually, now that Characidae has been broken up, Loricariidae slides into the number 4 slot, superseded only by Cyprinidae, Cichlidae, and Gobiidae.
The suckermouth armored catfish family Loricariidae spans over 1,050 species, making it the fifth most diverse family of vertebrates.
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Globally, slightly more fish species are recognized from freshwater habitats than marine habitats.
@DrNathanLujan I'm quite surprised that all three families are freshwater fishes, as I thought that an oceanic fish family would get the crown.
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Cichlidae and Cyprinidae are practically tied for most diverse vertebrate family, each with ~1760 valid species.
@DrNathanLujan Who's number 1?
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What can I say…..god loves invertebrates more. There are 400,000 species of beetles.
@DrNathanLujan Damn, I'm surprised that "only" 1050 spp. makes it the fifth most diverse family
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RT @Survival: 🔴 Ye’kwana Indigenous people denounce violence & illegal mining on their territory 🔴 The Ye’kwana People of the Tencua commu…
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The suckermouth armored catfish family Loricariidae spans over 1,050 species, making it the fifth most diverse family of vertebrates.
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Check out this Hemipsilichthys papillatus (MCP 39539), a member of the 'primitive' loricariid subfamily Delturinae from the Paraíba do Sul drainage in southeastern Brazil. It has large cheek odontodes like the more diverse Hypostominae subfamily, but it can't evert them.
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That is the digestive tract, which is likely radiopaque due to being packed with diatoms.
@DrNathanLujan What is the spiraling structure?
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Check out this Hemipsilichthys papillatus (MCP 39539), a member of the 'primitive' loricariid subfamily Delturinae from the Paraíba do Sul drainage in southeastern Brazil. It has large cheek odontodes like the more diverse Hypostominae subfamily, but it can't evert them.
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RT @mongabay_brasil: Novas hidrovias na Amazônia podem agravar mudanças climáticas, alertam especialistas
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New tribe-level classification of Loricariidae by Jon Armbruster and myself now out in Neotropical Ichthyology. We also assign these two upper Orinoco endemic species, formerly in Pseudancistrus, to new genera and a new tribe.
#NewGenusAlert - New tribe-level classification of #Hypostominae (#Loricariidae), with descriptions of three new tribes, #Peckoltini, #Pseudancistrini and #Stellantini with two new genera, #𝐶𝑜𝑙𝑜𝑠𝑠𝑖𝑚𝑦𝑠𝑡𝑎𝑥 and #𝑆𝑡𝑒𝑙𝑙𝑎𝑛𝑡𝑖𝑎. 🔓
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RT @Labanmusinguzi: Evidence of difficult and unpleasant conditions within fishing communities in Uganda through pictures: A thread🧵 https:…
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