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THE LIBRARY OF THE

OCT6-1939

UNJVERS1IY OF ILLINOIS

ZOOLOGICAL SERIES

OF
FIELD MUSEUM OF NATURAL HISTORY

Volume 24 CHICAGO, SEPTEMBER 19, 1939 No. 9

CARCINOLOGICAL NOTES

BY CLAIRE NEMEC

ASSOCIATE, DIVISION OP LOWER INVERTEBRATES

While setting in order the small miscellaneous accumulation of
crustaceans in Field Museum's reference collection, I found a stomato-
pod which requires comparison with the available descriptions, and
a new brachyuran, both from the Fiji Islands. My work on the col-
lection has been under the direction of Dr. JMt^gEg^pCjU^ator of
Lower Invertebrates, and I am indebted to him Ipn.aiot^nd advice
in drawing up the present brief paper.

Gonodactylus glyptocercus Wood-Mason.UNlVERsm

Gonodactylus glyptocercus Wood-Mason, Proc. Asiatic Soc. Bengal, p. 232,

1875.
Protosquilla cerebralis Brooks, Voy. H. M. S. Challenger, 16, Stomatopoda,

p. 72, pi. 14, figs. 2, 3; pi. 16, figs. 2, 3, 1886.
Gonodactylus glyptocercus Kemp, Mem. Indian Mus., 4, p. 186, 1913; Bigelow,

Bull. Mus. Comp. Zool., 72, p. 136, 1931.

Body form. — Not uniform in width from the anterior edge of the
carapace to the posterior edge of the telson, but the exposed seg-
ments of the thorax quite slender in comparison with the carapace
and abdomen. The entire animal is less compact than is pictured
by Brooks and looks much more slender and graceful.

Carapace. — Greatest breadth approximately equals the median
length; laminar-looking structure underneath the carapace in the
reproduction of Brooks' drawing is, in reality, the raptorial limb
(see appendages). The eyes are one-third the length of the carapace,
with the median spine of the rostrum reaching about one-fourth the
length of the eyestalk.

Abdomen. — In the fifth abdominal somite on each side of the two
median parallel longitudinal grooves, 12 grooves radiate obliquely,
posteriorly and dorsally for those eight which are dorsally situated,
and posteriorly and ventrally for those four which are laterally
situated. Each groove of the entire 26 is distinct in itself with no
bifurcation.

No. 451 105

Natural History Librmry

106 FIELD MUSEUM OF NATURAL HISTORY — ZOOLOGY, VOL. 24

In the sixth abdominal somite the 02 -shaped ridge on either side
near the anterior margin is quite obscured by a more complicated
pattern, but the two submedian U-shaped ridges are readily visible.

The telson dentition of 9, 1, 0 corresponds to that given by
Brooks, as does the entire design of the telson.

Appendages. — The uropod as well as the antennae is much larger
in comparison with the total animal than is shown by Brooks. The
outer spine of the process from its base is twice the length of the inner.
As mentioned by Brooks, there are on the proximal segment of the
exopodite ten conspicuous marginal spines, which also curve upwards
towards the dorsal surface (see Brooks' description and figure).

The position of the raptorial limb in reference to the body is
entirely different from that shown by Brooks. It is here compared in
the drawings.

Color. — This particular specimen possesses the characteristic
patches on the sixth and seventh thoracic and first and fourth
abdominal somites, three distinct dark bands on the raptorial limb,
a patch in each corner of the carapace and on the antero-median
border, and scattered pigmentation on the remaining thoracic seg-
ment and the second, third, and fifth abdominal segments, but not
on the sixth segment or telson.

FIG. 10. Last two abdominal segments, telson, and right uropod of G. glypto-
cercus. X4.

Measurement. — The length is 32 mm. or approximately the same
as the specimen described by Brooks. This specimen was also from
the Fiji Islands.

Remarks. — The characteristics and range of variation of this
species of Gonodactylus being under discussion, it seemed advisable

1939

CARCINOLOGICAL NOTES — NEMEC

107

to supply additional information from the specimen (here figured)
in Field Museum's collection, taken at Viti Levu, Fiji Islands, by
the Crane Pacific Expedition of 1929 (No. 1904).

a b

FIG. 11. G. glyptocercus. a. After Brooks. X2. 6. Field Mus. 1904. X2.

Uca ischnodactylus sp. nov.

Material. — Twelve specimens (1 female and 11 males) from
Suva Harbor, Fiji Islands, in mangrove; Crane Pacific Expedition,
March 16, 1929. Type (male, Field Museum 1971). Paratypes
(Field Museum 1972).

Diagnosis. — Allied to U. arcuata De Haan and U. inversa Hoff-
mann; front spatuliform and very narrow; movable finger quite
slender, with a curved, toothed blade at extremity.

Carapace. — Convex in both directions; H-marking visible but
not strongly defined; strongly convergent posteriorly; entirely
smooth except for a few minute granules at the anterolateral angles;
front spatuliform, about one- twentieth the width of carapace; fronto-
orbital width great, meeting lateral margins to form an acute, pro-
longed antero-lateral angle; orbital margins sinuous, raised borders
finely serrate.

108 FIELD MUSEUM OF NATURAL HISTORY — ZOOLOGY, VOL. 24

Ambulatory legs. — Minutely granular, especially the meral joints;
hair sparse and short, found principally on the meral joints.

Chela.— Outer surface of palm and carpal joint roughly tubercu-
late, the internal lateral margins of the carpus and palm being
fringed with a row of hairs; the oblique tuberculate ridge of the
inner surface of the palm terminates at carpal cavity; fingers slender
and gaping except at tips, which overlap; inner edge of fixed finger
finely dentate throughout entire length, the size of the tubercles
decreasing somewhat distally; principal teeth of dactylus in two
main groups of two proximal and one distal; extreme distal portion
of dactylus ends in a definite, toothed, blade-like projection, the
proximal and distal teeth of which are the largest; this projection

1"E U3RAW OF THE

OCT6-J939

FIG. 12. U. ischnodactylus, hand of large cheliped. X2.

is prolonged into a curved spine which overlaps the tip of the fixed
finger.

Color. — Carapace (in alcohol) dull green-brown; upper internal
surface of palm red-orange, the color extending a short distance up
into the fingers; orange patch also on the under surfaces of all the
joints of the cheliped except the carpus; remainder of cheliped and
the ambulatory legs a yellow-white.

Measurements of type and allotype. — Length of carapace of type
12.5, of allotype 11.8; width of carapace of type 21, of allotype 17.

Variation. — No great divergence from the type except for the
principal teeth groups which can be, besides the 2:1 ratio, 3:1, 3:0,
or even 0:0; seven males found to be left-handed, four right-handed.

Remarks. — There appears to be no close resemblance to any single
species, but the general body form is similar to that of U. arcuata
De Haan and U. heterochelos Lamarck, although tapering more
posteriorly. The shape of the chela is, as a whole, that of U. inversa
Hoffmann, while the dentition of the hand follows that of U. arcuata
with the exception that the dactylus only, and not the fixed finger,
has the curved blade.

UNIVERSITY OF ILLINOIS-URBANA