A 3-plot panel with some statistics describing the invertober25 dataset. First plot: proportion of species per taxonomical class. Second plot: relationship between level of difficulty of each invertober species vs level of satisfaction of the final result. Third plot: gene occupancy table of the molecular dataset used fot the phylogeny.

2/2🧵 Call me a nerd, but my brain goes crazy for #phylogenetic trees: I find them elegant and easy to read! So I couldn't help but to draw one for my #invertober2025 wrap-up 🖥️🧬

I also run a series of basics stats 👀 see them below and find the full explanation on github.com/filonico/inv...

Maximum likelihood phylogenetic tree of species included in invertober2025, plus figures for each of them

1/2🧵 After >1 month I can finally share my #invertober2025 phylogenetic wrap-up!! Actually it was done weeks ago, but I just didn't have the time to put everything together. #phylogenetics 🖥️🧬

Find the full-size version plus caption and additional content on github.com/filonico/inv...

​A vectorial digital drawing of an Acherontia atropos, or Death's-head Hawkmoth, viewed from above and set against a pale blue background. The moth has large wings with a pattern of black, dark brown, and orange-yellow markings. The most distinctive feature is the thorax, which is marked with a skull-like pattern in tan, black, and yellow. The large abdomen is segmented with alternating black and orange-yellow bands. The text "invertobter2025 – Day 31" is in the bottom right corner.

This is the end 💥 I approached #invertober with no clear expectations, and now I can say it was exciting+painful+rewarding+exhausting! #SciArt

What's the most appropriate subject for Day 31 of #invertober2025 if not the death's-head hawk moth?

Stay tuned as I'll be publishing a wrap-up soon 👀

BEHOLD y'all the hecking bloody bobbit worm, who finally decided to get out from their sand burrow for the begone Day 14 of #invertober2025 #MarineLife

This took way longer than I expected (3 sessions of 2+ hours each). The problem was not the body structure itself, but the freaking segments 💀

A vectorial digital drawing of an Anoplognathus pallidicollis, or Christmas Beetle, viewed from above and set against a pale blue background. The beetle has a light tan and pale straw-colored body and elytra (wing covers), which are covered in fine, speckled dots. The thorax and head are slightly darker, glossy reddish-brown, and the legs are a thick, segmented dark brown color. The text "invertobter2025 – Day 30" is in the bottom right corner.

This was pretty smooth, I don't have much to say about this chunky buddy 🥹

Day 30 of #invertober2025 is the Christmas beetle! #bugsky

A vectorial digital drawing of a Mesocentrotus franciscanus, or Red Sea Urchin, set against a pale blue background. The organism is depicted as a dense, radiating ball of long, sharp deep red and purplish-red spines. The text "invertobter2025 - Day 29" is in the bottom right corner.

What the heck was this?! I suspected sea urchins were difficult to draw, but this was just random spikes here & there 😵‍💫 I knew from skeletons that there should be a precise arrangement, but I gave up in few minutes #marineLife

Almost done with #invertober2025, Day29 is with the red sea urchin

Dude has loooooong wings, I had to reduce its size a lot 💀 at least this time I wasn't defeated by venations (see below), so I also managed to put legs 🥳

In #invertober2025 Day 28 we caught a pearly green lacewing

I know, I know, it's November. But...
#Invertober day 31: Death's-head hawkmoth (Acherontia atropos) #invertober2025

​A vectorial digital drawing of a Dermacentor variabilis, or American Dog Tick, showing the sexual dimorphism, set against a pale blue background. The tick is split down the middle: In the ​Left Half (male) the dorsal shield is fully covered in a glossy, reddish-brown color with complex white/cream patterns covering most of its surface. ​In the right Half (female) the dorsal shield is dark reddish-brown and glossy, with a simple white/cream pattern near the head. The tick has eight thick, reddish-brown legs. The text "invertobter2025 - Day 27" is in the bottom right corner.

FUN FACT. Ticks are #arachnids, so they usually have 8 legs. But not always! When they hatch, they have only 6—the additional pair grows after the first molt 🕵 don't be fooled by mistaking them for insects! #bugsky

Day 27 of #invertober2025 features the American dog tick and its sexual dimorphism

​A hand-painted watercolor illustration of a sea cow nudibranch resting on a piece of red, porous sponge. The nudibranch has a pale body with large, irregular dark brown/maroon spots and a few small, yellowish-green spots. Two small rhinophores are visible on its head, and small, feathery white gills are visible on its back. The red sponge is deeply textured with large dark holes. A light blue watercolor wash is applied to the background near the subject. The painting is on textured white watercolor paper.

2/2 🧵 The sea bunny comes with a friend today for #invertober2025: the sea cow (Peltodoris atromaculata)! Am I building a farm maybe? #MarineLife

This drawing belongs to my watercolor period, from a couple of years ago. I enjoyed this technique a lot, hope that at some point I'll take it up again.

​A vectorial digital drawing of a Jorunna parva, a species of sea slug commonly known as the Sea Bunny, set against a pale blue background. The nudibranch has an oval, light gray/white body covered in small brown and black speckles. Its most distinctive features are its two large, prominent rhinophores (sensory organs) on its head, which are black with white tips. At the rear, it displays its gills (branchial plume) as a cluster of white feathery structures with black edges. The text "invertobter2025 - Day 26" is in the bottom right corner.

1/2 🧵 Aren't nudibranchs the most precious marine crawlers? 🥹 #marineLife #SciArt

Double feature for Day 26 of #invertober2025, with the cute sea bunny here. And scroll down to meet its buddy!

A vectorial digital drawing of a Scutigera coleoptrata, or House Centipede, viewed from above and set against a pale blue background. The centipede has a central, segmented body colored in tan and brown stripes. Its most defining feature is the array of many extremely long, slender, striped legs radiating outward, giving it a spiky, oval appearance. It also has long antennae extending from the head. The text "invertobter2025 - Day 25" is in the bottom right corner.

Back on track for #invertober2025 with the house centipede!

I usually like all kinds of critters, but must admit that I find centipedes quite intimidating: maybe it's their unpredictable and slithery movements 👀 #bugsky

Stay tuned, as I'm preparing an epilogue for my #invertober

symmetrical color block art of a death's head hawk moth . it is drawn in simplified colors and patterns on an orange background, with a black frame with cartoony bones and skulls and a moth at the keystone. death's head is written at the center bottom

#invertober 31, 💀death’s head hawk moth💀

#invertober2025

all of them together #invertober #invertober2025

New Zealand mussel, house centipede, pearly green lacewing, sea bunny, American dog tick, Red Sea urchin, Christmas beetle, deaths head hawk moth

and so ends #invertober with
day 24-31

#invertober2025

Day 31: Death’s-head hawk moth (Acherontia atropos)

[ #invertober #invertober2025 ]

Digital, stylized drawings of a New Zealand Mussel, House Centipede, Sea Bunny, American Dog Tick, Pearly Green Lacewing, Red Sea Urchin, Christmas Beetle, and Death’s-Head Hawk Moth

#invertober2025 24-31
Too bad there weren’t any Stomatopods this Invertober.
#sciart #art

Digital drawing of a Death's-head hawk moth, a large fuzzy moth with gray, gold, and brown patterns including a shape that looks like a human skull on its back. There are 5 tiny white comma-shaped ghosts hovering around it in wonder.

Happy #Invertober day 31, and Happy Halloween to those who celebrate!

Death's-head hawk moth (Acherontia atropos)

Thank you to @fossilforager.bsky.social for the prompt list. Been a lot of fun and learned a lot 🦋🦗🪳🐛🪼🐌

#SciArt #Invertober2025

drawing of a caterpillar. It is plump and light green, with yellow head and legs. On the back, it has a pattern of blue-green segments with dark spots.

Day 31 of #invertober
Death's Head Hawk Moth

a good baby.

#invertober2025
ref by marek285 on iNaturalist

7x5 grid on a black background of 32 invertebrates, from jellyfish, leafhoppers, anemones, weevils, lobsters, moths, snails, flies, cuttlefish, worms, spiders, clams, spiders, caterpillars, isopods, flatworms, nudibranch, dragonflies, ticks, centipedes, sea urchins, lacewings, squid, mosquitoes in the middle are their latin names in white text: INVERTOBER 2025 1 | Chrysaora pacifica 2 | Graphocephala coccinea 3 | Anthopleura xanthogrammica 4 | Rhynchophorus cruentatus 5 | Panulirus versicolor 6 | Phalera bucephala 7 | Chrysomallon squamiferum 8 | Mallophora fautrix 9 | Ascarosepion pfefferi 10 | Lumbricus terrestris 11 | Dolomedes tenebrosus 12 | Siliqua patula 13 | Camponotus consobrinus 14 | Eunice aphroditois 15 | Ornithoptera alexandrae 16 | Bathynomus giganteus 17 | Pseudoceros concinnus 18 | Sceliphron caementarium 19 | Vampyroteuthis infernalis 20 | Velella velella 21 | Libellula saturata 22 | Clione limacina 23 | Cicindela albissima 24 | Perna canaliculus 25 | Scutigera coleoptrata 26 | Jorunna parva 27 | Dermacentor variabilis 28 | Chrysopa perla 29 | Mesocentrotus franciscanus 30 | Anoplognathus pallidicollis 31 | Acherontia atropos extra | Aedes aegypti

7x5 grid on a white background of 32 invertebrates, from jellyfish, leafhoppers, anemones, weevils, lobsters, moths, snails, flies, cuttlefish, worms, spiders, clams, spiders, caterpillars, isopods, flatworms, nudibranch, dragonflies, ticks, centipedes, sea urchins, lacewings, squid, mosquitoes in the middle are their latin names in white text: INVERTOBER 2025 1 | Chrysaora pacifica 2 | Graphocephala coccinea 3 | Anthopleura xanthogrammica 4 | Rhynchophorus cruentatus 5 | Panulirus versicolor 6 | Phalera bucephala 7 | Chrysomallon squamiferum 8 | Mallophora fautrix 9 | Ascarosepion pfefferi 10 | Lumbricus terrestris 11 | Dolomedes tenebrosus 12 | Siliqua patula 13 | Camponotus consobrinus 14 | Eunice aphroditois 15 | Ornithoptera alexandrae 16 | Bathynomus giganteus 17 | Pseudoceros concinnus 18 | Sceliphron caementarium 19 | Vampyroteuthis infernalis 20 | Velella velella 21 | Libellula saturata 22 | Clione limacina 23 | Cicindela albissima 24 | Perna canaliculus 25 | Scutigera coleoptrata 26 | Jorunna parva 27 | Dermacentor variabilis 28 | Chrysopa perla 29 | Mesocentrotus franciscanus 30 | Anoplognathus pallidicollis 31 | Acherontia atropos extra | Aedes aegypti

it is DONE my dudes, 32 goobers for #Invertober2025

now I REST because 3 drawing challenges in 3 months is A TAD BIT TOO MUCH

#SciArt #invertebrates

semi-realistic drawing of a skull moth, but it is chubby with chubby leggies and bright yellow underwings and looks like a bark, on a black background.

semi-realistic drawing of a skull moth, but it is chubby with chubby leggies and bright yellow underwings and looks like a bark, on a white background.

Day 31 #Invertober2025 - Death’s-head hawk moth (Acherontia atropos) 💀

#SciArt #invertebrates

color block art of the head and front legs of a christmas beetle facing the viewer. there are sparklies on the blue gradient backround

#invertober 30, christmas beetle! wrong holiday buddy!!

#invertober2025

drawing of a beetle. The beetle has a beige shell with dark dots on the elytra, and reddish orange hairy legs.

Day 30 of #invertober
Christmas Beetle

I am fully caught up & ready to face the last day of the month!

#invertober2025

Day 30: Christmas beetle (Anoplognathus pallidicollis)

[ #invertober #invertober2025 ]

October 31st: Ghost + Death's-Head Hawk Moth!

Posting this one early as I'm getting married tomorrow! I also filled in the white squares finally haha

This moth has reached a new realm!

#easyautumn #invertober #invertober2025 #sciart #art #artchallenge #ninjascreations #inverts #ghost #moth

October 30th: Skull + Christmas Beetle!

A classic scene of a beetle coming out of an eye socket!

#easyautumn #invertober #invertober2025 #sciart #art #artchallenge #ninjascreations #inverts #skull #beetle

#Invertober2025 Day 30: Anoplognathus pallidicollis. Pencil.

Verdict: Scarabaeoid if not Scarabaeid - nothing to improve upon, they’re brilliant. Fun to draw! I did start yesterday’s sea urchin but I felt my sanity on the verge of departing so to save everyone, I gave up.

#Invertober #SciArt

Digital drawing of a small tannish beetle with a pattern of brown spotted lines down its shell.

Happy #Invertober day 30!

Almost there!

Christmas beetle (Anoplognathus pallidicollis)

#invertober2025

drawing of an urchin. It has a dark red shell, and the quills are pink, red, and orange.

Day 29 of #invertober
Red Sea Urchin

I like urchins, and especially urchin fossils <3

#invertober2025

lineless art of a red sea urchin with a line drawing of its larval form overlaying the adult, much larger then its real microscopic size. the background is a blue sealike gradient with particulate and ripples

#invertober 29, red sea urchin+larval overlay

#invertober2025