Invertebrate with internal skeleton

Welcome to Hypography, a forum for science and technology. Registration is fast, simple and absolutely free so please, join our community today! If you have any problems with the registration process or your account login, please contact us.

		Science Forums > Help and Advice > Questions and Answers
Invertebrate with internal skeleton

LinkBack

Question Tools

Published by Moontanman 01-15-2008

Can you name an invertebrate with an internal skeleton?

By Dracontes on 01-16-2008

Re: Invertebrate with internal skeleton

Lessee... Animals with endoskeletons besides Chordates

Echinodermata: their skeleton, even the spines are covered in thin layer of epidermis.

Coleoidea: the shells of belemnites, squid and cuttlefish are internal so I guess it counts in a way.

Porifera: the siliceous/calcareous/spongin spicules are internal to the cells that produce them.

I heard something about some arthropods, like arachnids or crustaceans, having internal extensions of their exoskeleton or internal organic/mineralized plates to provide attachment sites for muscles. So after some sleuthing I found that spiders and relatives do have an internal skeleton: the endosternite (character 5 in the list) and that decapod crustaceans also share the distinction (page 36 of the *.pdf onward; lengthy download ~6 MB). Another link and an abstract:

Colette Bitsch & Jacques Bitsch. (2002). "The endoskeletal structures in arthropods: cytology, morphology and evolution". Arthropod Structure & Development Volume 30, Issue 3, Pages 159-177

Quote:

The paper proposes an overview of the endoskeletal structures of the head and trunk in the different arthropod groups: Chelicerata, Crustacea, Myriapoda and Hexapoda (=Insecta s.l.). Two major endoskeletal systems are reported with their cytological characteristics: those made up of connective tissue derived from muscular tendons, and those consisting of cuticular rods or plates arising from integumentary ingrowths. The morphological value of the various endoskeletal structures, their possible homologies in different groups, and their presumed evolutionary changes are discussed. This survey may be considered as a first step to use morphological characteristics of the endoskeleton in future cladistic analyses to assess the phylogeny of arthropods.

I hope to have helped

By Moontanman on 01-17-2008

Re: Invertebrate with internal skeleton

Quote:

Originally Posted by Dracontes

Possibly I should have been more exact, sea urchins and their kin are the only invertabrate that has a complete interenal sckeleton, The others have extentions of their external sceletons that are internal. the good news is you got it right, i should have knwn not to ask such simple question to this group!

Michael

Bookmarks

Currently Active Users Viewing This Question: 1 (0 members and 1 guests)

Question Tools
Show Printable Version Email this Page

Posting Rules
You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Trackbacks are On Pingbacks are On Refbacks are On

Similar Threads
Question	Question Starter	Category	Comments	Last Post
Research Shows Skeleton to be Endocrine Organ	C1ay	General Science News	0	08-13-2007 05:12 AM
Paleontologists discover most primitive primate skeleton	Tormod	General Science News	0	01-24-2007 02:02 AM
Humans' internal chemistry is Amazing!!	Racoon	Biology	23	04-02-2006 11:45 AM
Internal pressure in planets and stars	Boerseun	Earth science	6	06-02-2005 12:14 AM

All times are GMT -8. The time now is 03:02 PM.

Invertebrate with internal skeleton

Hypography?

Share the love!

Sponsors

Friends