|
|
|
|
#51
02/18/2007, 12:29 AM
|
|||
|
|||
|
Zoea 9
 In the 9th zoea,the antenna is almost half the length of the scale. This is a lateral view.You can see the scale under the eyes.The antenna can be seen below the scale.
__________________
Luis A M |
|
#52
02/18/2007, 03:13 AM
|
|||
|
|||
|
Luis,
excellent pictures!
__________________
Have a nice day Peter |
|
#53
02/18/2007, 03:45 PM
|
|||
|
|||
|
Quote:
 .They are not fancy but serve the purpose of showing the development of the antenna,which is the key feature to recognize the 8th,9th and 10th zoeas.Antenna is hard to see if you donīt know how it looks and where to watch.In fact,some people have missed it and believed the larvae were marking time until the pleopod buds stage,which they called Z8,like in peppermints,instead of Z11. But using these pics as a guide,I think anybody checking L.amboinensis larvae under a scope,will be able to ID these new stages.
__________________
Luis A M |
|
#54
02/18/2007, 05:03 PM
|
|||
|
|||
|
Zoea 10
 This is the 10th zoea,in a lateral view.Antenna,now with a whitish tip,reaches close to the bifurcation of A1,the antennula,or almost the total length of the scale. Closer view:  Interestingly,in some larvae,I could see a very incipient bud of pleopods,but only in 3th and 4th pairs,heralding the bud development of next stage: 
__________________
Luis A M |
|
#56
02/18/2007, 06:40 PM
|
|||
|
|||
|
Quote:
__________________
Luis A M |
|
#57
02/18/2007, 09:11 PM
|
|||
|
|||
|
Zoea 11
The 11th zoea shows the pleopod buds:
 The antenna is now longer than the scale and the fork of the antennule:  but antenna isnīt relevant any more.From now on development of pleopods is what counts.
__________________
Luis A M |
|
#59
02/19/2007, 05:09 PM
|
|||
|
|||
|
90 days
Well,my lonely larva is still hanging on,and reached 90 days!
My previous record was 99. Pleopods look fully developed.If it was a peppermint,I would say it was last stage,close to settling. But amboinensis should grow up to 20 mm and 120 days so I expect new stages and/or marking time.This is a view of the pleopods:  Each pleopod has two branches:exopodite and endopodite.See a close look:  Endop.are well developed,with setae (hairs)all around.But exop.are less developed,shorter (about 60%) and especially narrower. Will see what comes next,provided this larva survives! 
__________________
Luis A M |
|
#60
02/19/2007, 05:35 PM
|
|||
|
|||
|
Your missing the AI and mine have an AM developed as well on the last stage, so Pp are not quite fully developed; one more stage to go.
So how big is it now?? 1.5-2.0mm??
__________________
Andy "If we knew what it was we were doing, it would not be called research, would it?" Albert Einstein |
|
#61
02/19/2007, 07:02 PM
|
|||
|
|||
|
Quote:
 Yes,I canīt see an AI,and exop.look like they still have to grow. What is AM?. So I expect another stage.It is 15mm now and has to grow to 20,so some marking time is expected. A2 is closely banded and a little shorter than A1.Could colour marks assist in staging?
__________________
Luis A M |
|
#62
02/20/2007, 07:40 AM
|
|||
|
|||
|
Quote:
Andy, so the PL 1 has on pp2 AI and AM present...how big is the AM in relation to the endopod? |
|
#63
02/20/2007, 09:25 AM
|
|||
|
|||
|
I know crazy, sexually developed during the larval stage. If I remember correctly it had 3 spines and looked fully developed. The speicmen I preserved that was in the last stage is out of the country right now.
__________________
Andy "If we knew what it was we were doing, it would not be called research, would it?" Albert Einstein |
|
#64
02/20/2007, 10:30 AM
|
|||
|
|||
|
Well, maybe another evolutionary characterisitc we should take in account...remember the lenght of AM of L. wurdemanni and boggessi compaired to our new species one ..think about that for a moment
|
|
#65
02/20/2007, 12:52 PM
|
|||
|
|||
|
Quote:
 PL=post larva or pleopod? pp=pereiopod or propodeus?How does the AM look?.I thought it appeared in the post larva,in the 1st pleop.and later disappears with the onset of hermaphroditism?. I have seen chelae (claws) in pp 1 and 2 in the last larval stages of boggessi. On a more lively note,it is nice to see how this big larva uses the paddles of pp3 and pp4 for feeding.When food is introduced and smell reaches the zoea,it starts fanning quickly with these paddles,creating a water current aimed to the mouth parts.
__________________
Luis A M |
|
#66
02/20/2007, 06:56 PM
|
|||
|
|||
|
Quote:
pp - pleopods The AM is on pp2, between AI and endopod. It appears in male phase individuals and disappears in females phase individuals. You should not see the AM on boggessi larvae...it is only present a few molts after settlement. Nice observation on the paddle function Give me you email address, Ill send you a pic or drawing of the AM and its location |
|
#67
02/23/2007, 11:01 PM
|
|||
|
|||
|
Errata
I had an error in my description of the branches of the pleopods (swimmerttes)
What I called exopods are actually the endopods and my endopods are the real exopods. So in my last pic,captions should be interchanged. Thanks to Andy and Helio for informing me about that. I took the description from Wunsch monography,so I copied his mistake.Hard to believe he could mix up pleopod branches in such an important work.Wunsch was the first to raise L.amboinensis (and L.debelius). Anyway,my larva reached 95 days today.Looks larger but the pleops donīt show obvious changes.Only that I think I see a bud of AI in the smaller,narrower branch (now the endopod) Almost breaking my 99 days record...
__________________
Luis A M |
|
#68
02/24/2007, 06:02 AM
|
|||
|
|||
|
Re: Errata
Quote:
__________________
Bred blood, skunk, peppermint and camel shrimps, sugar gliders, leopard geckos, Phelsuma standingi, Goniurosaurus hainanensis. |
|
#69
02/24/2007, 10:27 AM
|
|||
|
|||
|
Re: Re: Errata
Quote:
"If ainīt broken..."
__________________
Luis A M |
|
#71
02/28/2007, 04:34 PM
|
|||
|
|||
|
100 days!
My larva is 100 days old,breaking my survival record!
 It molted today,and it is larger.A couple of days ago I noticed a very incipient hydroid growth,and moved the zoea right away to a clean tank. This seems to be the trick,fighting hydroids
__________________
Luis A M |
|
#72
02/28/2007, 08:38 PM
|
|||
|
|||
|
Congrats.... I was wondring how do you get hydroids in your tank...
 I ve never seen one in my system
|
|
#73
03/01/2007, 01:04 PM
|
|||
|
|||
|
Quote:
Everybody is pested with them.They sure come in the LR,though there was a myth that they come in bs eggs.They show an explosive growth where bbs is supplied.
__________________
Luis A M |
|
#74
03/01/2007, 03:28 PM
|
|||
|
|||
|
Well,I checked the pleopods again and they donīt show any change I could notice.Exopods (see previous errata) remain well developed and covered with setae all around.Endopods remain shorter and much narrower,the 1st pair being undeveloped.
But I definitely see the AI in the endops,will post pics later. So I suspect the zoea is in the last larval stage.But it keeps molting and growing, "marking time".It is about twice as big as peppermint last zoea. Is this the normal strategy of this species prolonging the larval life to produce a larger post larva?"Giant larvae" are also known for S.hispidus... Or the larva,which should be now ready to settle,is lacking the famous "settling clues"or some other stressing factor keeps it "bumping"in the last larval stage?. I am inclined towards the first.Larvae unable to settle should die,not keep growing. Besides a "masochist game",it is a thriller;you lose just one larva and you lose everything
__________________
Luis A M |
|
#75
03/01/2007, 09:23 PM
|
|||
|
|||
|
Quote:
Either way, if a settling cue is missing, they will still eat, molt and grow....so the end result will still be big larvae.. Besides, if the pleopods arent completly developed like you mentioned, they arent ready to morph... |
|
|
Linear Mode
