Part 2 - AToL Decapoda

NUMBER 543 37
FIGURE 15.—Macrohrachium rosenbergii from the Philippines: a, anterior carapace and appendages, lateral
aspect, of male collected from Jaro River, Panay, by H.C. Keller (Naval Eclipse Expedition, 1929), with carapace
length of 66.0 mm (USNM 10526); b, right 3rd pereopod, dactyl, and propodus, of male from Zamboanga River,
Mindanao, with carapace length of 81.3 mm; same, dactyl, denuded.
proximal 3 A of length (in adults), fixed finger without
pubescence, fingers dentate on proximal '/2 of opposable
margins (in adults), somewhat gaping in large males, 3 /4 to
quite as long as palm, palm without any dense pubescence,
chela slightly to l 3 /4 times as long as carpus, palm x ji to quite
as long as carpus, carpus slightly to nearly 1 '/2 times as long as
merus, with indistinct longitudinal groove; 3rd pereopod
overreaching antennal scale by less than length of dactyl,
propodus bearing rather numerous spines or sharp scales;
maximum postorbital carapace length about 100 mm.
MATERIAL.—PHILIPPINES. Zamboanga River, Mindanao;
[6°54'N, 122°04'E]; 9 Oct 1909: 1 male [81.3].
RANGE.—India to southern China, Philippines, Indonesia,
and northern Australia, in fresh, brackish, and sometimes salt
water; widely introduced elsewhere throughout the tropical and
subtropical parts of the world in propagation operations.
REMARKS.—Although Johnson (1973) made a fairly convincing
case for the recognition of at least two geographic
subspecies of M. rosenbergii, subsequent analyses of sympatric
male morpho-types (e.g., Kuris, Ra'anan, Sagi, and Cohen,
1987) suggest that causative factors for the variability of the
species may be more complex than realized heretofore. The
single large male in the Albatross collection, from the
Zamboanga River, Mindanao, Philippines, seems to represent
the typical variety on the basis of the characters proposed by
Johnson, but it is apparent that far more effort must be devoted
to the problem before a satisfactory solution is obtainable.
43. Macrobrachium scabriculum (Heller, 1862)
Palaemon scahriculus Heller, 1862a:527 [type locality: Sri Lanka].
Palaemon (s.s.) dolichodactylus Hilgendorf, 1879:840, pi. 4: fig. 18 [type
locality: Tete, Mozambique].
Plalaemon] dubius Henderson and Matthai, 1910:300, pi. 18: fig. 9 [type
locality: Chingleput District, SE. India].
Macrobrachium scabriculum.—Holthuis, 1950a:224.
DIAGNOSIS.—Rostrum not reaching level of distal end of
antennal scale, dorsal margin convex, rostral formula: 4-5 +
8-10/2-3, dorsal teeth subequally spaced; branchiostegal
suture not extending posteriorly beyond hepatic spine; telson
with posterior apex not overreaching posterolateral spines;
antennal scale with lateral margin concave; 1 st pereopod with
chela '/2 as long as carpus; 2nd pereopods unequal in length and
dissimilar in form; major 2nd pereopod with palm compressed,
fingers densely pubescent at extreme proximal ends, dentate on
opposable margins, gaping, about as long as palm, palm
completely covered in dense pubescence (in large males), chela
2 3 /4-3'/2 times as long as carpus, palm 1 '/3 to twice as long as
carpus, carpus from 4 /5 to quite as long as merus, with distinct
longitudinal groove; minor 2nd pereopod with fingers 1 'A-1 '/2
times as long as palm; 3rd pereopod not overreaching antennal
scale; maximum postorbital carapace length about 40 mm.
RANGE.—Eastern Africa, Madagascar, India, Sri Lanka, and
Indian Ocean coast of Sumatra.