Connected on 2015-04-29 18:30:00 from Alameda County, California, United States
- Bugscope Team sample is in 'scope and pumping down
- Teacher hi all - we are just starting class and I will prep the students on what we are doing - so we may not start chatting for about 10 minutes while I introduce things :0
- Bugscope Team cool. looking for more interesting stuff...
- Bugscope Team Hi Misha!
- Bugscope Team Welcome to Bugscope!
- Guest thanks!
- Guest hi Scot J!
Bugscope Team Are you with CSUEB or from somewhere else in the Outer World?
- Bugscope Team Hi Laura! Bethany! Megan!
- Bugscope Team Hi Heather L!
- Guest Hi ScotJ!
- Bugscope Team Yay!
- Guest Hi ScotJ!
- Bugscope Team This is a spider's leg, up close.
- Bugscope Team You can see that they have setae (hairs) that are kind of frilly on all sides like a pine tree.
- Bugscope Team Hi Kristie! Hello Jammin' Jennifer!
- Bugscope Team haha
- Bugscope Team Hi Rebecca!
- Guest What are the holes?
Bugscope Team I hadn't noticed them before. I am not sure if they're empty sockets or a sort of pore.
- Bugscope Team Spiders have a cephalothorax, like a head/trunk, that is hard like an insect's exoskeleton.
- Teacher Who has control of the scope? This is Korb here.
Bugscope Team um, me?
Bugscope Team You should have control.
- Bugscope Team CSUEB can you see the controls or are they just not there?
- Bugscope Team Lately, with the change to a new server, some of these things are not quite the same as they were.
- Bugscope Team Are there any librarians or library science students online?
- Bugscope Team ha you are driving
- Teacher I don't see the scope controls. No librarians online
Bugscope Team Just let us know where you want to go unless you want to try logging out and in again...
Bugscope Team sorry....
- Teacher I will log out and in again
- Bugscope Team Dr K I gave you control in your new blue attire.
- Student Tell us about this image.
Bugscope Team this is the ball and socket joint that connects one of the rolypoly's 14 legs to its body.
Bugscope Team like where the head of the femur goes into the pelvis, except for a rolpoly.
- Bugscope Team the little setae, or bristles, we see are likely for proprioception.
- Bugscope Team rolypolys are not actually insects. They are isopods, a group of crustaceans, some of which have adapted to living on land
- Guest Are the long structures hair?
Bugscope Team yes but we are not supposed to call them hair.
Bugscope Team some are microsetae, which don't extend through the exoskeleton, and some are setae, which reach through to nerves beneath
- Guest what is "proprioception"?
Bugscope Team sensing where your body parts are in relation to one another. for example, when you raise your arm you can feel that the arm is raised above your head even if you have your eyes closed.
Bugscope Team some of the setae are located within and around joints, so when the rolypoly bends them the hairs also move and this is interpreted as self movement by the isopod. Insects and other arthropods also use setae for similar purposes.
- Guest are scorpions isopods?
Bugscope Team no they are arachnids, like spiders
Bugscope Team scorpions chew their food...
- Guest Is the structural design of a rolypoly's leg joints the same as that of a crab? Up close, it looks like crab legs.
- Guest what are some other isopods?
Bugscope Team most live underwater, like something called a sea slater
Bugscope Team There are some pretty bizarre species of parasitic marine isopods. For example, some species enter the mouths of fish and bite their tongues off, replacing them and eating bits of food that the fish take into their mouths
- Student Hi Scott, This is Sarafina. We would like to see a spider's face.
Bugscope Team I am sorry -- we can get close, maybe, but it is hard to make out
Bugscope Team let's start with being on the spider...
- Student what is the light part?
Bugscope Team hard to tell just how Cate made the sample. it's like she took two spiders, one with shaved legs and one without, and piled them onto each other.
- Student are the fangs in the picture?
Bugscope Team yes to the upper left
Bugscope Team they are unfortunately covered with juju
- Student whats ju ju?
Bugscope Team it's usually the one thing in an image that we don't recognize. sometimes it is a dried fluid.
- Guest Are the spines on the spider's legs similar to those of the rolypoly? Can they smell, taste, and sense too?
Bugscope Team it depends on where the spines are; with a spider they are mostly vibration sensory
Bugscope Team different setae in different places smell and taste and sense hot/cold; sometimes they are at the tips of the legs or just on palps, near the head
- Bugscope Team housefly
- Bugscope Team this is Uma Thurman's birthday, right?
- Student what is the part in the back?
- Guest interesting. so I'm confused about this though. SJ suggested that scorpions are not isopods because they chew their food. So these parasitic marine isopods bite. Do they chew? Is chewing or not chewing one of the characteristics that defines what isopods are?
Bugscope Team I confused things by saying that scorpions chew their food, but I meant compared to spiders, who suck their food up like a milkshake
Bugscope Team Duh and I met this woman who was a complete spider freak a month or so ago, and she told me spiders chew. not sure I believe her.
Bugscope Team all crustaceans belong to the subphylum mandibulata, which is characterized by having mandibulate mouthparts. mandibles are jaw like structures typically used for chewing, although some mandibulata have reduced mandibles or have lost them completely and may use them to suck food. spiders and scorpions are both arachnids, which is part of the subphylum Chelicerata, characterized by having chelicerate mouthparts. chelicerae are jointed structures which can be used to suck up prey (spider fangs for example are a part of the spiders chelicerae). Scorpions also use their chelicerae to crush their food
Bugscope Team Scott, theyll use their chelicerae to crush their food to squeeze the juices out. so yes they chew, but they can still only swallow liquid food, and they also regurgitate digestive enymes onto their food to help liquify it
- Guest Great questions, Natalie!
- Bugscope Team flies with their eyes far apart are females, like Uma Thurman; flies with their eyes close together are males, like Mikhail Baryshnikov.
- Guest Is there a gland that secretes the spider's web?
Bugscope Team there are glands in the abdomen that produce the liquid that becomes web when it hits the air; some web is sticky and some is not; they can make it the way they need to, and and I am not sure how
- Guest Do spiders have blood?
Bugscope Team I think they have a version of hemolymph, which is what insects have that is like blood
Bugscope Team I believe their blood is called hemocyanin. Instead of using an iron atom to transport oxygen it uses a copper atom.
- Student why do they eyes look like nets?
Bugscope Team the most efficient way of stacking spheres in a dome-like shape, like stacking oranges, is in hexagons. the ommatidia - the eye facets - are similar
- Bugscope Team Josh is a mymecologist but he knows a lot about other more distasteful (to him) insects and arthropods.
- Bugscope Team oops myrmecologist
- Guest ah, sorry about that! entomologist.
- Guest Josh, SJ and Scot J, are you entymologists and could you tell me what a typical (work) day is like for you?
Bugscope Team The correct term is entomologist. Ive also been called an etymologist, which is someone who studies the origin of words, so you are pretty close compared to some people!
Bugscope Team I am currently a graduate student, so I take a lot of classes in addition to doing research. Right now my actual thesis project hasnt officially started so i have been focusing on finishing up some side projects. I am hoping to conduct research on arboreal trap-jaw ants in Peru this summer as part of my thesis research
- Guest I imagine that a sticky web is used for capturing prey. What is a non-sticky web typically used for?
Bugscope Team climbing on, if you are a spider
- Guest can we look at the web glands?
Bugscope Team no I am sorry -- they are on the abdomen, which usually shrinks like crazy -- it often shrivels up
Bugscope Team spider abdomenal cuticle does not contain exocuticle, which is the layer of the exoskeleton that gives it its rigid structure. because of this, the abdomen is relatively soft and often shrinks when dried out.
- Guest What part of the spider does the web come out of? What is the web made of? Do all spiders have the capability of spinning a web?
Bugscope Team the webbing comes out of the spinnerets, which are located on the ventro-posterior part of the abdomen. Spiders have anywhere from 4 to 8 spinnerets. The webbing is composed of many proteins that are originally in liquid form, but the process of moving through the spinnerets rearranges their position within the liquid and causes the proteins to solidify into the web strands you are used to seeing
Bugscope Team All spiders can produce webbing, but most do not construct the orb shaped webs people typically think of when they picture spiders
- Bugscope Team When we make a sample we are working at the macro level, and even when we use a light microscope we cannot tell how good or bad the sample will be at high mag. We also usually mount the samples ventral side up so you can see more stuff.
- Student In this image what are the holes (dimple) that we are seeing?
Bugscope Team those are little craters in the doublestick carbon tape we use to help hold the insects/arthropods down on the stub.
- Guest For the rolypoly, What are the panels called on the exoskeleton?
Bugscope Team pereonites
Bugscope Team the thorax is called the pereon
- Student Hi Scott, this is Laura, do you have any dorsal views of the rolly polly?
Bugscope Team haha No. I am so sorry. Cate made the sample, but I would like have given you ventral views as well.
Bugscope Team because dorsal views are often not as interesting, and one of the rolypolys might have better mouthparts, for example
- Guest cool Josh G, how did you decide to focus on arboreal trap-jaw ants? and are they only found in Peru?
Bugscope Team I am very interested in studying the evolution of novel prey capture mechanisms in ants, and how biomechanical properties of these mechanisms constrain and guide the evolution of these mechanisms. Trap-jaw ants are an excellent group to study this because trap-jaws have evolved independently multiple times within ants.
Bugscope Team I chose to study this particular group of ants because they are in a lineage of trap-jaw ants which has been relatively understudied, and their arboreal life style may impose certain limitations on how they can use their trap-jaws which could be interesting to study
Bugscope Team Scott sometimes puts trap-jaw ant specimens on the plates to show bugscope classes, but did not this time, so I'll try not to steal the thunder of the other specimens currently on this plate by talking about them too much ;)
- Guest cool Josh G, thanks for telling me about your studies! and good luck in Peru!
- Guest Is there a specific number of pereonites that the rolypoly typical have?
Bugscope Team eight; I just looked it up. there are seven pairs of legs on these
- Guest Thank you!
- Guest is it looking right at us?
- Bugscope Team I think rolypolies look like old-time librarians, so mean
Bugscope Team Nah, rolypolies have much fewer legs....
- Student In this image, which part is the mouth?
Bugscope Team kind of a bulldog mouth
Bugscope Team the top part of the image. what Scott is zooming in on now
- Guest A spider we are observing in class looks like it has an extra pair of legs near its mouth? What are these called?
Bugscope Team palps, or pedipalps
Bugscope Team those of males are usually larger and more bulbous; those of females are usually smaller
Bugscope Team the males use the pedipalps for sperm transfer
- Guest What "stuff" is housed inside of a spider's abdomen
Bugscope Team what will become the web, for one thing; spiders can eat their web and thus recycle it if they want.
- Student What body parts are inside a spider's cephalothorax versus the abdomen?
Bugscope Team the head and the thorax are fused into a cephalothorax; the legs are attached to the cephalothorax, as is the abdomen
Bugscope Team internally, the cephalothorax houses the leg muscles, the phyrangeal muscle which acts as a pump that the spider uses to suck out juices from its prey, the brain, and sometimes the venom glands. the abdomen contains most of the other internal organs such as the stomach and rest of the digestive system, the book lungs, the dorsal heart, the silk organs, the ovaries/testes, etc.
- Bugscope Team Male spiders sometimes push a wad of web onto the chelicers of the female, right in the middle, so they cannot open the chelicers and use their fangs to bite.
Bugscope Team we found a female with the web stuck between her chelicers in a Bugscope session a few years ago
- Bugscope Team usually some part of the what we are seeing now are called cerci
- Student Hey there - Dr. Korb here again - we are going to log off in a few minutes. Any last thoughts?
Bugscope Team thank you for connecting and having such good questions. I am really happy to have Josh here to give you the best answers.
- Student This is a chatty group!
Bugscope Team awesome for us
- Student What is the function of these 2 long parts?
Bugscope Team primarily sensory. Cockroaches for example can use them to sense air currents caused by an approaching foot, and reflexively run out of the way. Thats why crushing them can be so difficult. for the most part they are probably a vestigial pair of abdominal legs that has been adapted for another function in some arthropods but completely lost in others
- Student Thanks to Josh!!!
Bugscope Team Definitely.
- Bugscope Team I do what I can guys :)
- Bugscope Team Happy to help out.
- Bugscope Team Thank you, everyone!
- Guest Thank you!
- Bugscope Team See you! I'm shutting down and hitting the street. Thank you again!