As a Penaeid (Dendrobranchiate)
and thus not a true (Caridean) shrimp, the epimera
of the second abdominal segment of this animal do not overlap the
of segments 1 and 2 (photo).
shrimp and crabs, Dendrobranchiate crustaceans have gills which are
in structure (photo).
As a member of family
Penaeidae, this shrimp is distinguished from family Sergestidae by
on all 3 of its first 3 pairs of pereopods (photo)
(Sergestidae is chelate
only on pereopods 2 & 3). Also, members of family
always have a well-developed rostrum
while the rostrum
of sergestids is usually very small. The most obvious
features of Bentheogennema shrimp to me on first
glance is that
they have long setae fringing their first antennae and antennal
scales, making them appear to have a long moustache (photo);
plus they have large pereopods
which are colored very dark red, which they hold bunched together under
their body in a dark mass. Bentheogennema
curved, vertical transverse
grooves on the dorsal carapace
which cross the median ridge but are not interrupted by it (photo).
The distinctive rostrum
has a line of forward-pointed setae
from the dorsal spine to the front (photo).
has only 1 pair of stout median spines on its truncate
Bentheogennema burkenroadi Krygier
and Wasmer, 1975
Common name(s): Burkenroad
[Informal Group] Natantia
bathypelagic 100 mi off Point Conception,
|(Photo by: Dave Cowles,
How to Distinguish from
Similar Species: Bentheogennema
borealis has a median ridge dorsally on its carapace
which interrupts the transverse
carinae, + the telson
has 2 pairs of stout median spines.
Krygier, Earl E. and Robert A. Wasmer, 1975.
and biology of a new species of pelagic penaeid shrimp, Bentheogennema
burkenroadi, from the northeastern Pacific. Fishery
73:4 pp. 737-746
General Notes and
Observations: Locations, abundances,
of abdominal segment 2 does not overlap that of segments 1 and
This view shows the thorax to the left and abdominal segments 1-4 with
the bases of the pleopods.
Photo is of a preserved specimen.
This animal swims through the water with its feathery pleopods.
The head of this preserved specimen is to the right.
In this photo the dendrobranchiate (tree-like in structure) gills can
be seen hanging from below the carapace.
In this species the gills are podobranchs,
which is an epipod
gill attached to the coxa
(basal segment) of the legs.
gills are arising, left to right, from the third maxilliped
and from pereopods
Photo of a preserved specimen
As a member of family Penaeidae, pereopods 1-3 are all chelate.
This photo of a preserved specimen shows the chelae
1 (left) to 3 (right).
Both the antennules (first antennae) and the antennal scale have
which together make the animal look like it has a thick moustache from
Note also the long second antennae, visible on the left side of the
animal (top), which extends forward, has a sharp bend, and has a long flagellum
Photo of preserved specimen.
The long antennal flagellum
is lined along one side with a double row of curved setae
which arch outwards and then curve toward one another like the ribs of
a vacuum cleaner hose.
Shorter, enervated setae
are found in the middle of the circle formed by the long setae.
Together, this structure forms a lateral-line like detector of
sound or vibrations.
As can be seen in this dorsal view of a preserved specimen, the curving
vertical grooves on the carapace
cross the mid-dorsal ridge but are not interrupted by it.
The same grooves plus other carinae
can be seen here in this side view of the carapace
The distinctive rostrum
has a dorsal spine, a line of forward-pointing setae,
and an anterior spine.
is shorter than the uropods.
It ends with only one pair of stout median spines, (with a row of setae
Authors and Editors of Page:
Dave Cowles (2006): Created original page