This discussion arises from a Triphora collected in Key Largo and sent to Dan Teven in a vial of micros. Dan posted the following comment:

"There was one Triphora in the batch, which appears to be Marshallora modesta. According to Redfern, Triphora nigrocincta (which is what I would've called this shell) may really be a complex of species, of which M. modesta is one. I presume M. nichupte is another, but I still haven't seen a pic or a description."

Marlo: There are several of us collectors here in Florida who agree with the comment cited by Redfern regarding M. nigrocincta. Be that as it may, M. modesta is a clearly defined species very common around Florida often identified as M. nigrocincta.  M. nichupte is far less common (as far as I know only documented from the Keys), but since it was named only 11 years ago, it may well be in collections from other Florida locations as M. modesta or M. nigrocincta.

I'm posting this comparison of the

protoconchs to allow distinction

between the two if you have specimens

with protoconchs.  They are so

different that there can be no confusion.

However, M. modesta and M. nichupte

are very, very similar in overall features.

And, if you are trying to identify a less

than adult specimen, there is really

only one character to rely upon to

accurately distinguish the two - the

protoconchs.  The protoconch of 

M. nichupte has 1.5 - 2 smooth, 

bulbose whorls versus M. modesta with

4- 4.5 conical whorls with those below

the nucleus having two spiral cords in

the middle and axial cords above, in

between, and below.

​

Note:  Unfortunately, the shell illustrating

M. nichupte is lost.  It was collected by Marlo

Krisberg in Key Largo, Florida Keys on 02/20/06.