Gorgoleptis emarginatus McLean, 1988. Family Lepetodrilidae. ChEss logo OBIS species link

Gorgoleptis emarginatusGorgoleptis emarginatus SEM

Also see:
Protoconch SEM Fig. 2 Mullineaux et al. (1996)

Size under dissecting microscope: 180µm
Size under compound microscope: 175µm
Gorgoleptis emarginatus is one of three presumed Gorgoleptis morphs we find in plankton samples at 9N. It has coarse pitted sculpture in rows that follow the curve of the shell. The most distinctive feature of these protoconchs is the scalloped edges of the aperture, with sharp points at the anterior edge and on either side. There is a narrow aperture rim, tapering toward the posterior edge. The protoconch matches that of Gorgoleptis emarginatus in size and sculpture, but the scallops are not preserved in post-larval specimens, making the identification somewhat tentative.
Pump EPR 1999-2000: Occasional
Pump EPR 2004: Frequent
Trap EPR 2004-2005: Frequent

Can be confused with

Gorgoleptis spiralisGorgoleptis emarginatus and G. spiralis
Gorgoleptis spiralis is the most similar protoconch to G. emarginatus.  In general appearance and sculpture the two are nearly identical, but G. spiralis is about 30µm smaller.  The lower picture illustrates the difference; G. emarginatus is on the left.
Gorgoleptis sp. 3
Gorgoleptis sp. 3 is approximately the same size as G. emarginatus, with similar sculpture.  It has a more pronounced point at the outer edge of the aperture and lacks the side points.  It is also much less common.
Pointy apex and Clypeosectus delectus
Clypeosectus delectus (right) and pointy apex are similar in size and sculpture to the Gorgoleptis species.  The main difference is in the shape of the aperture: all the Gorgoleptis species have at least one sharp point, whereas in the other species it is nearly straight.

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