NEXT UP: #8 seed PINK VENT FISH (Thermarces cerberus) vs #9 seed LATHE ACTEON SNAIL (Acteon tornatilis) #2021MMM  two long slender greyish pinkish fish with large round pectwo pinkish tan striped turbinate shaped shells
Pink Vent Fish is a predator associated w/ deep sea hydrothermal vents fed by volcanos in the Eastern Pacific Ocean, hence our combatant is named in honor of Cerberus, the 3-headed hound in Greek mythology who guards the entrance to the underworld alongside Hades #2021MMM  line drawing of a massive three headed dog with the tail ofglobal map of deep sea vents
Pink Vent Fish feed on vent snails, limpets, and the amphipod crustaceans (Micheli et al 2002) #WatchOutSnailTheyllChewYouUp #2021MMM Photo of a large greyish pinkish fish in its habitat
Lathe Aceteon Snail belongs to a group called Bubble Snails (Acteonoidea). It is also a predator that eats mostly worms in the intertidal zones of the North Atlantic. #ActualLivingScientist @algaebarnacle is a marine ecologist who studies intertidal zones & other systems #2021MMM Five museum specimens of tan and pink striped snail shells oScientist standing on rocks in the intertidal zone
The Lathe Aceteon Snail doesn't eat just any ol' worm, it prefers to drill holes into the protective sheath built by Owenia tubeworms & suck their guts out. Though a voracious carnivore, it doesn't seem to display any apparent defenses (Yonow 1989) #2021MMM Screenshot from journal article by Yonow describing how snai
Actaeon was a priestly herdsman in Greek mythology, transformed into a stag by Artemis for spying on her, then hunted & killed by his own pack of hunting dogs who did not recognize him in his ungulate form #2021MMM Marble statue at The Kings of Naples Royal Palace of Caserta
Tonight's battle takes place in the East Pacific Rise, the location of a 2003 deep sea expedition led by @FieldMuseum curator Janet Voight, where she collected several Pink Vent Fish @VertNetOrg #CollectionsAreEssential… #2021MMM Map of the Pacific Ocean and the Americas with a dot labelin
We descend to the scene of the battle via Jason, a remotely operated vehicle (ROV) equipped w/ sonars, video and still imaging systems, lighting, and numerous sampling systems. Robotic arms place specimens in the vehicle’s basket or on platforms #2021MMM… Yellow submarine suspended from a cable on a large boat bein
There are 4 habitat zones around hydrothermal vents, the tubeworm or vestimentiferan zone closest to the vents, the clam or bivalve zone, the suspension-feeder zone, & furthest away, the periphery zone. Pink Vent Fish hang out in the Vestimentiferan (Micheli et al 2002) #2021MMM
The East Pacific Rise is quite different from the habitat Lathe Acteon Snail is accustomed to - the under water pressure is much heavier, the oxygen drawn in through its gills feels much richer, and tubeworms are EVERYWHERE. (Mullineaux et al 2018) #2021MMM Figure from Mullineaux et al journal article showing deep se
The Lathe Aceteon Snail slides along the ocean floor toward the tubeworms, looking forward to a tasty meal. #2021MMM
As it moves closer the oxygen saturation decreases & the hydrogen sulfide saturation increases (Childress 1995). The Lathe Aceteon Snail is not well adapted to this environment & attempts to retreat back to the bivalve zone, turning to the right #2021MMM
The Pink Vent Fish is scanning among the tubeworms & takes notice of the snail going in a circle. Specifically, in a right hand circle. Why? #2021MMM Traffic sign indicating right turn
Because the Lathe Acteon Snail has behavioral adaptations to keep it from washing out to sea or going too far upshore! By almost always turning right, it stays in the intertidal zone & within reach of it's main food resources (Yonow 1989) #2021MMM Screenshot from Yonow 1989 journal article describing snail
Pink Vent Fish sizes up the snail, calculates distance & speed, & STRIKES! #2021MMM

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More from @TCastanea

18 Mar
NEXT UP: #5 seed DEVIL FROG vs #12 seed FIRE SALAMANDER #2021MMM Color illustration of a lar...Photo of a black and yellow...
Both of tonights combatants are amphibians, which have lived on Earth for at least 370 million years. The word amphibian comes from the Greek word amphibios, meaning "to live a double life", in reference to their aquatic & terrestrial life histories. (Vences et al 2005) #2021MMM Screen shot of figure from ...
Predatory amphibians like adult frogs & salamanders can only eat prey as big as their mouths open - "gape-limited" predators - & are often cannibalistic - they eat each other! #2021MMM
Read 15 tweets
12 Mar
NEXT UP: #2 seed RED WOLF versus #15 seed GIANT GOLDEN MOLE, co-written by @EvolEmpiricist @StoneLab_ASU & ME!! #2021MMM A reddish and dark grey wolf lies on the groundPrepared specimen of a Giant Golden Mole on display at the N
Giant Golden Moles are ~20 cm long & up to 539 grams (4x the size of other golden moles!). They vary in color, outer fur can be slate, dark brown, reddish or yellow-ish buff (Poduschka 1980) #2021MMM Drawing of golden mole but fur has greenish tinge
Giant golden moles share some of the same bones as other animals but THEY HAVE 3 FOREARM BONES & WE HAVE 2! Skeletal similarities can be used to evaluate species relatedness & last common ancestor (Seiffert 2007) #2021MMM… Figure showing how forearm bones vary in shape between speci
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11 Mar
FIRST UP!! #1 seed RED KANGAROO (Osphranter rufus) vs wild card winner SOUTHERN RED-BACKED VOLE (Myodes gapperi) #RedInFur #2021MMM
Red Kangaroos are the largest living marsupial, weighing in at up to 90kg & 1.8m tall when standing. Male red kangaroos are much larger than females, up to twice the size. Males are also reddish in color, while the females are bluish-grey (Freedman et al. 2020) #2021MMM
The hop of O. rufus averages 1m when the animal is moving slowly, but is lengthened with speed, up to 3–4 m. At short bursts, it can reach speeds of 40km/hr!! (Freedman et al 2020) #2021MMM
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17 Mar 20
Whether you call it a panther, puma, cougar, or mountain lion - Puma concolor means lion-of-one-color. Panthers are shades of tan, coryi subsp. is darker brown to rust & kittens are gray w/ dark brown/blackish spots & five bands around the tail.… #2020MMM Image
Mountain lions are one of the most widespread felids in the Americas. Rangewide @IUCN ranks them as Least Concern but the coryi subspecies has been listed by @USFWS as an endangered species since 1967.… #2020MMM Image
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13 Mar 20
NEXT UP: No. 1 seed Pygmy Hog (Porcula salvania) vs No. 16 seed Southern Ningaui (Ningaui yvonneae) #2020MMM ImageImage
Pygmy Hogs have blackish-brown fur shaded w/ rusty red that is longer at the nape of the neck. Weighing in at 3.7kg, males are larger than females. (Mallinson 1971)… #2020MMM Image
Pygmy Hogs once occurred in tall, wet grasslands throughout the Terai Arc (Oliver 1985) but now only occur in Manas & Rajiv Gandhi Orang National Parks, northwest Assam, India just north of the Brahmaputra River, the 9th largest river in the world #2020MMM… ImageImage
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26 Mar 19
NEXT UP: # 4 SEED FISHER VERSUS # 5 SEED TIGER OWL #2019MMM photo credits: Tom Kogut
Tiger owls are generally "free from natural enemies" predators such as coyotes, bobcats, mountain lions & are known to attack humans who get too close to their nests (Baumgartner 1939) #TheyWillCutYou #2019MMM
Males & females tiger owls mature by year 3 & females are larger. They produce 1-6 eggs/season & alternate roosting & hunting during the nesting season. Males do most of the hunting while females spend their time protecting the brood. (Baumgarter 1939) #2019MMM
Read 24 tweets

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