Conchostracans typically have concentric growth lines and a distinctive umbo located midbody (oval shaped shell). They also have an adductor muscle, but the scar can be difficult to see. Due to size and shape it seems to me (and a colleague) that you may have an ostracod shell.

Angela

> Date: Mon, 1 Dec 2008 15:02:14 -0200 > From: marcuscoltro@HOTMAIL.COM > Subject: [CONCH-L] RES: [CONCH-L] Conchostraca > To: CONCH-L@LISTSERV.UGA.EDU > > It seems they are completely smooth - unless all are eroded > > Marcus > > ________________________________________ > De: Conchologists List [mailto:CONCH-L@LISTSERV.UGA.EDU] Em nome de Angela Witmer > Enviada em: sábado, 29 de novembro de 2008 16:57 > Para: CONCH-L@LISTSERV.UGA.EDU > Assunto: Re: [CONCH-L] Conchostraca > > Hard to tell from the pictures... Does it have concentric ribbing? > > Angela > > > Date: Sat, 29 Nov 2008 15:42:56 -0200 > > From: marcuscoltro@HOTMAIL.COM > > Subject: [CONCH-L] Conchostraca > > To: CONCH-L@LISTSERV.UGA.EDU > > > > I got some small "bivalves" from a river in São Paulo (Brazil) and showed to Dr. Simone, who told > me > > they are Conchostraca (Crustacea). At first they look like bivalves but they lack the hinge or > > muscle marks > > > > http://www.wonderphotos.com/shellphotos/pulga.jpg > > > > They are 2 - 3mm. I took this lousy picture (on left) using my compact camera - on the right I > used > > the camera on my cell phone directly onto the microscope! > > > > Marcus > > > > ---------------------------------------------------------------------- > > CONCH-L@listserv.uga.edu - a forum for informal discussions on molluscs > > To leave this list, click on the following web link: > > http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1 > > Type your email address and name in the appropriate box and > > click leave the list. > > ---------------------------------------------------------------------- > ________________________________________ > Proud to be a PC? Show the world. Download the “I’m a PC” Messenger themepack now. Download now. > > ---------------------------------------------------------------------- > CONCH-L@listserv.uga.edu - a forum for informal discussions on molluscs > To leave this list, click on the following web link: > http://listserv.uga.edu/cgi-bin/wa?SUBED1=conch-l&A=1 > Type your email address and name in the appropriate box and > click leave the list. > ----------------------------------------------------------------------

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