ON STOMATOPOD CRUSTACEA FROM SERIBU ISLANDS AND ADJACENT WATERS WITH A DESCRIPTION OF A NEW SPECIES 1 ) by

The stomatopod fauna of Seribu Islands, Jakarta Bay, and adjacent waters is still poorly known. This study reveals the existence of 30 species in this area. A new species belonging to Oratosquilla is described. Records of distribution for those species are based on the material collected from this area only.


INTRODUCTION
The stomatopod fauna of Seribu Islands, Jakarta Bay, and adjacent waters is still poorly known.However, some species have been described by some workers, viz., DE MAN (1887) described Protosquilla brooksii (now Chorisquilla brooksii) which was collected from Edam Island, Jakarta Bay; HOLTHUIS'S type of Gonodactylus lenzi (now Haptosquilla lenzi) was collected from Jakarta Bay; SUNIER'S (1918) material for his publication on the stomatopod collection of the "Visscherij Station at Batavia" (now Lembaga Oseanologi Nasional) was partly collected from Jakarta Bay.Unfortunately these particular specimens are no longer in existence.The present study is based mainly on the existing collection of the Lembaga Oseanologi Nasional (LON = National Institute of Oceanology), with additional specimens from the Institute of Sea Fisheries Research, Jakarta, and the Bogor Zoological Museum, National Biological Institute, Indonesian Institute of Sciences.A total of 30 species of 14 genera belonging to 3 families have been recorded from the area, among those, a new species of Oratosquilla is described.

METHODS
Measurements of the specimens are given in millimeters (mm).The total length (TL) is measured from tip of rostrum to posterior end of telson along the midline.The carapace length (NL) is also measured along the midline, excluding the rostrum.The count of teeth of the raptorial dactylus always includes the terminal tooth.The Corneal Index (CI) is calculated as carapace length/cornea width x 100 (MANNING 1966).
The records of distribution for the species discussed in this paper are based on the material collected from Seribu Islands and adjacent waters only.The so-called adjacent waters include the offshore waters of the eastern part of South Sumatera, northern part of Sunda Strait, islands situated at southern part of Bangka, and Jawa Sea north of West Jawa.These waters are very close to Seribu Islands and therefore the stomatopod fauna in these waters may have similar composition.

TAXONOMIC ACCOUNT
The species so far known from Seribu Islands and adjacent waters are presented in the following list.
Remarks.-This species is not represented in the collection and known only from Edam Island (DE MAN 1887 as Gonodactylus n. sp.). the distribution is uncertain.The specimens of SUNIER from Jakarta were probably harpax, judging from their smaller sizes with the largest of 16.5 cm in length.Figure 3 of SUNIER is undoubtedly raphidea which was collected from Bagan Siapiapi, east Sumatera.The specimens of HOLTHUIS from Tanjung Priok and from Jakarta Bay were probably true raphidea, judging from their larger sizes.
Remarks.-This species is not represented in the collection, and known only from west of Seribu Islands (SUNIER 1918).
Description From O. woodmasoni it can be distinguished by the more prominent anterior lobe of the lateral process of the sixth and seventh thoracic somites and the much more prominent lobe on the outer margin of the inner longer spine of the basal prolongation of the uropod.From O. tweediei it is distinguished by the unarmed posterior submedian carina of the fourth abdominal somite and a median notch present at anterior margin of the ophthalmic somite of jakartensis (rounded in tweediei).CHOPRA (1934) mentioned a single female of 80 mm from Sandheads, India, together with some specimens from various localities in the Indian Museum collection as showing the presence of a small notch on anterior margin of the ophthalmic somite and the more developed lobe at the outer margin of the inner longer spine of the basal prolongation of the uropod.These characters were also mentioned by HOLTHUIS (1941) in the Snellius specimens which were partly collected from Jakarta.Some of the Snellius specimens and those mentioned by CHOPRA may belong to jakartensis.This supposition is supported by the fact that both authors did not mentioned the presence of the armed submedian carina of the fourth abdominal somite.
-The species is not represented in the collection, and known only from northwest of Seribu Islands (SUNIER 1918).Remarks.-The specimens fully agree with the description and figure of MANNING (1971).The spines of the lateral, intermediate and sub-median carinae of the last two abdominal somite are pink in colour.The spine on the dorsal surface of the proximal segment of the uropod is also pink.The marginal teeth of the telson are olive green.

Oratosquilla tweediei MANNING 1971
Previous record.-None.A new record for the area.
Remarks.-The species is not represented in the collection, and known only from northwest of Seribu Islands (SUNIER 1918), Tg. Priok, Jakarta (HOLTHUIS 1941).
(SUNIER 1918)th a gastropod attached; Untung Jawa Isl.; under coral boulder; coll.M.K.Moosa, 31/12/1963; cat.no.S. 082.-1 ♀ 13.74 mm; Sebaru Besar Isl.; under coral boulder; coll.M.K. Moosa, 7/4/1968; cat.no.S. 083.-Is 30.22 mm; Lancang Kecil Isl.Gonodactylus chiragra from Indonesia with sacs of eggs of different stages of development.The specimens from Seribu Island show that the larger gastropods with sacs of eggs are always on the posterior part of the stomatopod.The eggs sacs contain eggs with different stages of development.Previous records.-EdamIsl.(DEMAN1887,asGonodactylusgraphurus),JakartaBay(HOLTHUIS1941).is the presence of movable apices on submedian teeth of telson (not present on Squilla fasciata but present on all the other known members of the genus).MANNING (1968) stated that Anchisquilla consisted of species with diversified characters.Further study may reveal that this species will have to be separated from the other members of this genus.The characters that they share in common are the presence of movable apices on the submedian teeth of telson and the presence of the four epipods.By the complete absence of the movable apices of the submedian teeth of telson, it is clearly indicated that Anchisquilla fasciata is separated from the remaining species of Anchisquilla for which MANNING (personal communication) agrees that the remaining species of Anchisquilla may need a new generic name.Following MANNING'S key for the genera of Squillidae(MANNING  1968) Squilla fasciata will come into either Squilla or Squilloides.By having reduced complement of dorsal carinae on carapace and less developed abdominal carination, Squilla fasciata is much closer to Squilloides than to Squilla, which is unfortunately regarded as Atlanto-East Pacific genus.Further study is required to clear up the exact generic position of this species.Remarks.-Thespecimen is not represented in the collection from Seribu Islands and adjacent waters.The species is known only from western Seribu Islands(SUNIER 1918).Previous record.-None.A new record for the area.♀21.28 mm; west coast of Pasar Ikan river mouth; small beach-seine; mud; coll.M. K.Moosa, 5/8/1972; cat.no.S. 853.-1 ♀ 62.12 mm; Bintang Mas, Jakarta; small beach-seine; mud; coll.M. K.Moosa, 26/8/1972; cat.no. S. 884.
. -Dorsal surface of body smooth, glabrous.Eyes large, with bilobed cornea, set very obliquely on stalk; eyes not extending beyond end of first segment of antennular peduncle; ocular scale truncate, widely separated; anterior end of ophthalmic somite with a small triangular median notch; C I 308 in male and 313 in female.Antennular somite blunt.Antennal scale slender, short, more than half as long as carapace.Carapace broad, anterior more than half median length (including rostrum); anterolateral spines sharp, size moderate, not extending to base of rostral plate; median carina of carapace obscure anteriorly, anterior bifurcation replaced by lines of dark pigment.Dactylus of raptiorial claw with 6 teeth; outer margin of dectylus sinuate; dorsal ridge of carpus tuberculate, with 2 tubercles at distal end of sharp median ridge; inferodistal angle of outer face of merus with blunt, triangular notch.Mandibular palp and four epipods present.Last three of thoracic somites with submedian carinae; fifth somite faint; indication of submedian carina on posterior half; lateral process of fifth somite bilobed, with anterior lobe as an anteriorly directed blunt spine and posterior lobe slender, sharp, directed laterally; lateral process of sixth somite bilobed, with anterior lobe slightly recurved posteriorly and posterior lobe larger and triangular in shape; lateral process of seventh somite bilobed, with anterior lobe small, triangular with blunt apex and posterior lobe much larger with acute apex; ventral keel of eight somite low, rounded.First five abdominal somites with eight dorsal Notes OnStomatopod Crustacea From Seribu Islands .... (Moosa, M. K.)Colour.-preserved specimens are greyish mottled heavily with dark pigment.Median dorsal surface of the carapace, median dorsal surface of the exposed thoracic somites, median posterior margin of the first five abdominal somites, posterolateral portion of the sixth abdominal somite, outer distal part of the raptorial propodus, distal portion of the uropodal endopod and dorsolateral portion of the telson are the more heavily pigmented areas.Black pigmentation can be seen on the distal part of proximal segment of uropodal exopod, the midrib of distal segment of the uropodal exopod (on which the pigmentation becomes less toward inner margin), the inner and distal margin of the basal prolongation of the uropod, and the carinae of the marginal teeth of telson.Oratosquilla jakartensis clearly belongs to the woodmasoni group, which is characterized by the broad, smooth carapace and the absence of anterior bifurcation of median carina.