Halmahera Island Research Articles

Effect of Lime Stabilization on Vertical Deformation of Laterite Halmahera Soil

In this paper, the study was conducted to determine the lime effect on vertical deformation of road base physical model of laterite Halmahera soil. The samples of laterite soil were obtained from Halmahera Island, North Maluku Province, Indonesia. Soil characteristics were obtained from laboratory testing, according to American Standard for Testing and Materials (ASTM), consists of physical, mechanical, minerals, and chemical. The base layer of physical model testing with the dimension; 2m of length, 2m of width, and 1.5m of height. The addition of lime with variations of 3, 5, 7, an 10%, based on maximum dry density of standard Proctor test results and cured for 28 days. The model of lime treated laterite Halmahera soil with 0,1m thickness placed on subgrade layer with 1,5m thickness. Furthermore, the physical model was given static vertical loading. Some dial gauge is placed on the lime treated soil surface with distance interval 20cm, to read the vertical deformation that occurs during loading. The experimentals data was analyzed and validated with numerical analysis using finite element method. The results showed that the vertical deformation reduced significantly on 10% lime content (three times less than untreated soil), and qualify for maximum deflection (standard requirement L/240) on 7-10% lime content.

Dukono, the predominant source of volcanic degassing in Indonesia, sustained by a depleted Indian-MORB

Located on Halmahera island, Dukono is among the least known volcanoes in Indonesia. A compilation of the rare available reports indicates that this remote and hardly accessible volcano has been regularly in eruption since 1933, and has undergone nearly continuous eruptive manifestation over the last decade. The first study of its gas emissions, presented in this work, highlights a huge magmatic volatile contribution into the atmosphere, with an estimated annual output of about 290 kt of SO2, 5000 kt of H2O, 88 kt of CO2, 5 kt of H2S and 7 kt of H2. Assuming these figures are representative of the long-term continuous eruptive activity, then Dukono is the current most prominent volcanic gas discharge point in Indonesia and ranks among the top-ten volcanic SO2 sources on earth. Combining our findings with other recent volcanic SO2 flux results, obtained during periodic campaigns at a number of volcanoes with DOAS and UV-Cameras, the SO2 emission budget for Indonesia is estimated at 540 kt year−1, representing 2–3% of the global volcanic SO2 contribution into the atmosphere. This figure should be considered as minimum as gas emissions from numerous other active volcanoes in Indonesia are yet to be evaluated. This voluminous degassing output from Dukono is sustained by a depleted Indian-MORB (I-MORB) mantle source. This latter is currently undergoing lateral pressure from the steepening of the subducted slab, the downward force from the Philippine Sea plate and the westward motion of a continental fragments along the Sorong fault, leading to high fluid fluxes to the surface. Over the course of Dukono eruptive activity, the magma reservoir has changed from a less differentiated source that fed the past voluminous lava flows to a more evolved melt that sustained the current ongoing explosive activity.

Traditional knowledge on the use of local food crops by Togutil Ethnic in Halmahera Island, Indonesia

Tamalene MN. 2017. Traditional knowledge on the use of local food crops by Togutil Ethnic in Halmahera Island, Indonesia. Asian J Agric 1: 66-72. Food crop is an important component in the life system of Togutil ethnic group in Halmahera Island. The main characteristic of the ethnic is their nomadic life despite the existence of some sedentary groups. Generally, the ethnic consumes wild food plants growing in their natural ecosystem. This paper presents selected result of food crop studies conducted in Halmahera Island Indonesia. The botanical supply of food crops of the ethnic has high usefulness in their social and cultural activities. Data was collected through in-depth interview method to key informants chosen based on purposive sampling. Plant species was identified in the Laboratory of Herbarium Botany Bogoriense of the Biological Research Center of Indonesian Institute of Science (LIPI). 48 species of 23 families of food crops are used by Togutil tribe of Halmahera Island Indonesia. The food crops identified were wild plants of 45.83% growing in bushes habitat and primary forest and cultivated crops of 56.25% planted in the garden and yard. Other uses of the food crops were as medicinal plant of 64.28%, house building of 29.17%, and handicraft and adhesive for animal of 4.17%. In the cultural aspect, food crops were used for hunting ritual, medium of exchange (barter), welcoming guest ritual and traditional ritual. The value of Cultural Food Significance Index (CFSI) in very high significance category was 64.58%, high significance was 27.08%, and low significance and very low significance are 4.16%.

New record ofMelomys burtoni(Mammalia, Rodentia, Murinae) from Halmahera (North Moluccas, Indonesia): a review of MoluccanMelomys

AbstractMosaic-tailed rodents of the genusMelomysbelong to the Australasian old endemic murine radiation and exhibit a rat-like morphology with arboreal or scansorial specializations. Here we report a new population ofMelomys burtonifrom the island of Halmahera (in the North Moluccas, Indonesia). Our molecular phylogenetic results highlight close relationships and recent evolutionary divergences amongM. burtonifrom Halmahera and the Australo-Papuan taxaM. burtoniandM. lutillusand other Moluccan taxa, includingM. paveli. Multivariate as well as geometric morphometric analyses of cranial, and dental features support the recognition ofM. burtonifrom Halmahera as a slightly distinctive insular population, preventing us from elevating it as a new taxa. This population is recorded from lowland secondary forest and forest edge habitats in south-central Halmahera. As with other Moluccan endemic murines, colonization by an Australo-Papuan ancestor and subsequent isolation is the probable mode of diversification forM. burtoniin Halmahera. The discovery ofMelomysin Halmahera fills a previously puzzling gap in knowledge of the murine fauna of the Moluccas and the biogeography of the Wallacean region.

SEBARAN BENTENG KOLONIAL EROPA DI PESISIR BARAT PULAU HALMAHERA: JEJAK ARKEOLOGIS DAN SEJARAH PEREBUTAN WILAYAH DI KESULTANAN JAILOLO

The range of European domination in North Maluku had been traced by the distribution of archaeological fortress. The distribution of fortress in Northern Maluku can be found in the west coast of Halmahera Island as the center in past periode of the Sultanate Jailolo. Based on the background, this paper aims to reveal the distribution of fort on the west coast of Halmahera and historical context of the distribution of the fort in the region. Through descriptive method by using historical analogies approach obtained a description of the distribution pattern of the fort and the role of regions based on the position of forts on the western coast of Halmahera. At least, there are eight locations of those fortress, such as Gamkonora, Sahu, Gofasa, Gamlamo/Jailolo, Sidangoli, Dodin- ga, Oba, and Payahe. The role of each points of this location has different function and, including Gamkonora and Sahu at the north and Dodinga and Oba which is located in the south serves as a surveillance area to keep Gufasa and Gamlamo fortress in the mid- dle. Based on the distribution data can be seen the role of fortress each other Gamlamo as a center of power Jailolo, Sahu as buffer zones, as well Dodinga and Gamkonora as a fortress of frontier guards.

Mapping and Monitoring the Sea Surface Temperature in Weda Bay Using Terra and Aqua- Modis Satellites

Temperature is one of the principal controls on all physical, chemical and biological processes in the environment. Therefore, temperature data play an important role in earth resources management activities, including managing the effects of climate change. In this study, the sea surface temperatures (SSTs) of Weda Bay, Halmahera Island, Indonesia were mapped and monitored, from January to November 2007, using thermal infrared (TIR) band 30 and 31 of Terra- and Aqua MODIS satellites. The empirical prediction SST model developed, using TIR band and in-situ measurement SST, showed that the model was sufficient to predict and to map the SST within the bias ranges of ± 0.5°C. Daily SST, averaged 10 days SST, and monthly SST maps were made using 109 available Terra- and Aqua- MODIS images. The ranges of daily and 10-day average SSTs in Weda Bay were narrow, about 2°C (28-30°C) throughout the year, while the range for monthly SSTs was only 1°C (28.75-29.75°C). Accordingly, no indication of upwelling phenomena occurred in this bay during the observation (2007), but it is possible that upwelling could have happened in the past or may in the future. Long-term monitoring from space should continue in order to get a clearer understanding of the water characteristics in Weda Bay, not only using TIR, but also using ocean color bands of MODIS.

Comprehensive dataset of mangrove tree weights in Southeast Asia

AbstractWe assembled a dataset tabulating the weights of Thai and Indonesian mangrove trees that we measured between 1982 and 2001. We selected four Thai study sites in Phang Nga, Ranong, Satun, and Trat Provinces and one site in eastern Indonesia on Halmahera Island in Maluku Province. The stands in Ranong Province and on Halmahera Island were in primary forests with data collected in the 1980s and the remaining stands were in secondary forests with data collected later. We collected 124 tree samples from ten species (Avicennia alba, Bruguiera cylindrica, B. gymnorrhiza, Ceriops tagal, Rhizophora apiculata, R. mucronata, Sonneratia alba, S. caseolaris, Xylocarpus granatum, and X. moluccensis) and measured the root weights of 32 individuals of nine species (A. alba, B. cylindrica, B. gymnorrhiza, C. tagal, R. apiculata, R. mucronata, S. alba, S. caseolaris, and X. granatum). All sampled trees were subjected to a standardized protocol to obtain aboveground weights. The trunks were divided into horizontal segments from which the leaves and branches were collected separately. Roots were collected by winching them out of the ground, by trench digging, or by complete excavation. Thus, we were able to compile the weights of the trunk, branches, leaves, and roots of each tree sampled. Aerial roots were included in root weight measurements, although they were collected above ground. We compiled separate lists of trunk diameters, trunk heights, heights of the lowest living branches, and the heights of aerial roots on the trunks of trees in different size categories. Our dataset includes a wide range of tree sizes (maximum trunk diameter 48.9 cm), geographical locations (1°10′N–12°24′N, 98°32′E–123°49′E) and organ weights (trunks, branches, leaves, and roots), and therefore should prove useful in future biomass studies of mangrove forests.

Comparison of atmospheric citric acid leaching kinetics of nickel from different Indonesian saprolitic ores

Saprolitic ores from Sulawesi Island (SS ore) contain serpentine and goethite as major minerals, whereas the main minerals in saprolitic ore from Halmahera Island (SH ore) are talc and goethite. Most of the nickel was incorporated in a magnesium–silica-containing mineral. The effects on nickel extraction of leaching temperature, citric acid concentration, and ore particle size were determined to investigate the leaching performances and leaching kinetics of the two saprolitic ores. Nickel leaching efficiency from SS ore is always higher than that from SH ore under the same leaching conditions. The mineral contents of the ores significantly affected the leaching performances and mineral dissolution behaviors of the samples. The results of nickel leaching efficiency and analysis of the solid residues suggest that all dissolved nickel originated from serpentine, which is more easily leached than goethite and talc. The rate of nickel extraction for SS ore was faster than that for SH ore. Nickel leaching from SS ore and SH ore followed the shrinking-core model and was controlled by diffusion of a reactant or product through the solid product layer.

The Origin of Oranges: A Multi-locus Phylogeny of Rutaceae Subfamily Aurantioideae

Abstract The phylogeny of Rutaceae subfamily Aurantioideae has previously been estimated only using plastid and repetitive nuclear sequences. We added sequences of two low copy nuclear loci to allow further diagnosis of phenomena that may mislead phylogenetic inference. After testing for patterns expected under recombination, positive selection, and hybridization, we excluded data sets or sequences accordingly and then inferred the species tree using the multispecies coalescent. We then reconstructed the ancestral area using parsimony and the dispersal-extinction-cladogenesis model to test the hypothesis that Citrus s. l. may have originated in Australasia and migrated or rafted to Eastern Asia. The ancestral area of Citrus s. l. inferred under either method and several models was west of Wallace's line. Therefore, Citrus s. l. did not appear to have rafted west on what became the Halmahera Islands (Indonesia). Our findings are also consistent with previously reported ages for the origin of this group tha...

Ethnic Influence Against Land Use Patterns and Its Contribution to Community Income in The Aketajawe Lolobata National Park (Pengaruh Etnis Terhadap Pola Pemanfaatan Lahan Dan Kontribusinya Bagi Pendapatan Masyarakat Di Taman Nasional Aketajawe Lolobata)

Buffer zone management is an integrated practice of managing forest and agriculture land based on biophysical nature of region and social-culture combination to obtain an optimum forest and agriculture products that support local livelihood economy. The study was to identify the community land use patterns that shapes the buffer zone of Aketajawe Lolobata National Park particularly at Aketajawe block. Sampling villages were determined by stratification based on the distance from the National Park boundary which varied between <3,3-5, and > 5 km. The purposive random sampling was chosen 82 respondents to be interviewed. Land use pattern which applied by communities were divided into six groups according to cultivated commodities i.e. community forest, mixed garden, monoculture garden, intercropping garden, horticulture and rice fields. The differences of these patterns were influenced by background and origin of communities. The indigenous people of Halmahera island used their land as mixed garden while the settler used theirs as rice field and horticulture. Based on the land cover quality, mixed garden pattern was more similar to forest vegetation than another pattern. Rice field pattern gave the largest economic contribution while community forest gave the lowest contribution to the farmer’s income.

Ethnic Influence Against Land Use Patterns and Its Contribution to Community Income in The Aketajawe Lolobata National Park

Buffer zone management is an integrated practice of managing forest and agriculture land based on biophysical nature of region and social-culture combination to obtain an optimum forest and agriculture products that support local livelihood economy. The study was to identify the community land use patterns that shapes the buffer zone of Aketajawe Lolobata National Park particularly at Aketajawe block. Sampling villages were determined by stratification based on the distance from the National Park boundary which varied between <3,3-5, and > 5 km. The purposive random sampling was chosen 82 respondents to be interviewed. Land use pattern which applied by communities were divided into six groups according to cultivated commodities i.e. community forest, mixed garden, monoculture garden, intercropping garden, horticulture and rice fields. The differences of these patterns were influenced by background and origin of communities. The indigenous people of Halmahera island used their land as mixed garden while the settler used theirs as rice field and horticulture. Based on the land cover quality, mixed garden pattern was more similar to forest vegetation than another pattern. Rice field pattern gave the largest economic contribution while community forest gave the lowest contribution to the farmer’s income.

The Genus Pandanus Parkinson (Pandanaceae) on Halmahera Island (Moluccas, Indonesia) with Descriptions of Three New Species and a Key to the Species on the Island

Callmander, M. W., A. P. Keim, S. Buerki & P. B. Phillipson (2015). The genus Pandanus Parkinson (Pandanaceae) on Halmahera Island (Moluccas, Indonesia) with descriptions of three new species and a key to the species on the island. Candollea 70: 179–195. In English, English abstract. DOI: http//dx.doi.org/10.15553/c2015v702a2Halmahera is the largest (c. 18,000 km2) island of the Moluccan archipelago, but naturalists have only sporadically visited Halmahera and it has remained very poorly explored botanically. However, an intensive botanical inventory project was undertaken between 2012 and 2014 in part of the island to inform flora biodiversity management for certain proposed mining activities. This effort has contributed over 3600 plant collections and nearly doubled the number of Pandanus Parkinson (Pandanaceae) specimens (bringing the total to 55) available for Halmahera. After careful examination of all available material and comparison with other material from the region, we are able to present the first overview of the genus for the island. We have identified ten species from the island of which three are new to science and not known elsewhere, while the other seven are all representatives of species already described from other localities. The new species are formally described here as Pandanus beguinii Callm. & A. P. Keim, Pandanus benstoneoides Callm., Buerki & Phillipson and Pandanus halmaherensis Callm. & A. P. Keim. The new species are provided with notes on their respective morphology and known distributional and ecological ranges, line drawings. Those three new species are assigned a preliminary status of Endangered following IUCN Red List Categories and Criteria. All ten species are illustrated with colour photographs and a key to the species is provided.

Comparison of effectiveness of citric acid and other acids in leaching of low-grade Indonesian saprolitic ores

Comparison effect of chemical citric acid and other leaching reagents including inorganic acid and other organic acid on nickel extraction from low-grade Indonesian saprolitic ores was evaluated. Two saprolitic ores from two different mining areas (Sulawesi Island and Halmahera Island) in Indonesia were used to investigate the leaching performance and mineral dissolution behaviors of different ore samples using different leaching reagents. Leaching was performed using citric, sulfuric, nitric, hydrochloric, lactic, and oxalic acids. The saprolitic ore from Sulawesi Island (SS) has higher serpentine and lower goethite contents than the saprolitic ore from Halmahera Island (SH). These differences significantly affect the leaching performances and metal dissolution behaviors. Citric acid and sulfuric acid were more effective than other acid solutions for nickel extraction from both samples. Citric acid was very effective for dissolving nickel from serpentine, but did not recover nickel from goethite. In contrast, inorganic acids, namely sulfuric, nitric, and hydrochloric acids, can extract nickel from lateritic ores by dissolving goethite as well as serpentine, but the nickel recoveries achieved with sulfuric acid were higher than those achieved with other inorganic acids. A comparison of the leaching performances of the two samples shows that nickel recovery from SS was higher than that from SH when citric acid leaching was used, but the samples gave similar nickel recoveries in all inorganic acid and lactic acid leaching processes. Moreover, oxalic acid is the least effective reagent for nickel extraction from both samples, because of nickel oxalate precipitation after nickel dissolution. In addition, the effect of a sulfuric acid–citric acid mixture on the nickel dissolution rate was investigated to confirm the individual influences of citric acid and sulfuric acid on the leaching behavior of each sample. The results show that an increase in the amount of sulfuric acid affected the dissolution rate of nickel in leaching of SH much more than that in leaching of SS. In general, the effect of citric acid in the mixture of sulfuric acid and citric acid is attractive. Moreover, citric acid offers not only high nickel recovery and high selectivity of leaching but also an environmentally safe process and low acid consumption.

Precessional changes in the western equatorial Pacific Hydroclimate: A 240 kyr marine record from the Halmahera Sea, East Indonesia

AbstractWithin the precession band, an interhemispheric antiphase pattern in the tropical hydroclimate is supported by many paleorecords, and optimally explained by the forcing of precessional insolation change. However, scenarios within the western equatorial Pacific (WEP), which plays the role of the ascending center of atmospheric convection, remain poorly determined. In this study, a marine sediment core from the Halmahera Sea, East Indonesia, was analyzed with high‐resolution XRF scanning, quantitative discrete XRF, and ICP‐AES/MS measurements. The terrigenous fractions in this core are constrained by their trace elemental characteristics to be locally sourced from Halmahera Island, and hence reflect variations in the local riverine runoff and precipitation. On this basis, a continuous record of precipitation changes of the western equatorial Pacific was reconstructed with multidecadal resolution over the last ∼240 ka, using an age model established by the correlation between an adjusted ice volume model and benthic δ18O constrained by 14C dating. The records of terrigenous input show a dominant ∼23 kyr periodicity with a 90°∼100° phase lag to the boreal summer (i.e., in‐phase with the boreal autumn) insolation change. This pattern can be explained by the variability in the convective activity over the WEP, which might be primarily controlled by precessional changes in the El Niño and Southern Oscillation (ENSO) system. A dynamic linkage is implied between the precessional variations in the convective activity in the WEP and the East Asian and Australia‐Indonesian summer monsoons (EASM and AISM), in the sense of their distinct stable phase relationship to precession.

DIVERSITY AND ABUNDANCE OF ECHINODERMS AT WEDA BAY WATERS, NORTH MALUKU

<p>Weda Bay located at Halmahera Island, North Maluku was rich in fishes, sea cucumbers, crabs, shrimp, and alge resources. Research on diversity and density of echinoderms at Weda Bay, North Maluku was limited and therefore it was lack on data and information of the biota. The purpose of this study was to determine the diversity and density of echinoderms at Weda Bay, North Maluku. This research was conducted in March 2013 including transects and free collection of 6 stations contained echinoderms. The results showed that the overall echinoderms were found 23 species of 17 generas, 12 families, 10 orders, and 5 classes. Based on classes, the highest density of echinoderms was Asteroidea of 0.0456 ind/m<sup>2</sup> (43.76 %) foundin the seagrass sand habitat. Meanwhile, the lowest density was Crinoidea of 0.0002 ind/m<sup>2 </sup>(0.19%) found in corals habitats.</p> <p>Keywords: diversity, density, echinoderms, Weda bay, North Maluku.</p>

DIVERSITY AND ABUNDANCE OF ECHINODERMS AT WEDA BAY WATERS, NORTH MALUKU

Weda Bay located at Halmahera Island, North Maluku was rich in fishes, sea cucumbers, crabs, shrimp, and alge resources. Research on diversity and density of echinoderms at Weda Bay, North Maluku was limited and therefore it was lack on data and information of the biota. The purpose of this study was to determine the diversity and density of echinoderms at Weda Bay, North Maluku. This research was conducted in March 2013 including transects and free collection of 6 stations contained echinoderms. The results showed that the overall echinoderms were found 23 species of 17 generas, 12 families, 10 orders, and 5 classes. Based on classes, the highest density of echinoderms was Asteroidea of 0.0456 ind/m2 (43.76 %) foundin the seagrass sand habitat. Meanwhile, the lowest density was Crinoidea of 0.0002 ind/m2 (0.19%) found in corals habitats. Keywords: diversity, density, echinoderms, Weda bay, North Maluku.

Variasi Genetik Attacus atlas L. (Lepidoptera: Saturniidae) Berdasar Penanda Molekuler ISSR (Inter Simple Sequence Repeat)

Attacus atlas is one of potent silk-producing insect and possesses a significant economic value. A. atlas is part of genus Attacus which inhabits in several quite large areas. A.atlas can be found in Sumatera, Java, Borneo, Halmahera Islands, and Papua. Mostly, species which inhabits in wide spread area, has a high level of diversity. Applied studies on Antheraea dan Samia cynthia ricini showed that geographical differences led to genetic variations occurred upon those species. The aim of this research was to study and analyze the genetic variation A. Atlas, which is obtained from multiple sampling locations, ie Berbah, Dlingo, Ngawen, and Pracimantoro, based on ISSR marker. Analysis of genetic variation performed with 4 ISSR primer, ISSR1, ISSR2, ISSR6, and ISSR7 gave forth high genetic variations among individuals of A.atlas by indicating the average polymorphic percentage of all primer of 97,78%. Clustering analysis with unweighted pair group with arithmetic average (UPGMA) method resulted dendrogram that exhibiting similarity values among individuals in range between 61% - 87% and clustered into two main clusters at 61% similarity value. The first cluster consists of samples taken from from Dlingo, Ngawen and Pracimantoro which has elevation above 200 m asl, while the second cluster consists of samples originating from Berbah which has elevation below 200 m asl. Amplification used 4 ISSR primer performed 2 monomorphic loci and 82 polymorphic loci. Monomorphic at 300 bp showed by ISSR2 and at 1800 bp showed by ISSR7 may be a candidate locus identifier species of A. atlas. Keywords: Attacus atlas, genetic variation, PCR-ISSR

Birds Diversity in Tayawi’s Watersheed Area Aketajawe-Lolobata National Park

Aketajawe-Lolobata National Park was selected as one of conservation areas in Indonesia due to its important roles to preserve wildlife natural resources and its unique ecosystem. Our research on fauna diversity was designed to identify bird species diversity that inhabited Tayawi’s watershed within the Aketajawe-Lolobata National Park in North Maluku. We explored the area by using transect method; species identification was carried out by visual and vocal encounter. Fifty five bird species were identified and they belong to 25 families. Among them, 17 species were identified as endemic to Maluku and Halmahera islands. Based on our analysis and field observation, these areas had low fauna diversity. We suspected that illegal logging and hunting might have caused a rapid decrease of the bird population in Tayawi’s watershed area. These can be a serious threat if it is not well-anticipated. Therefore, urgent need is required to discontinue the activities of illegal logging and hunting.

Ibu volcano, a center of spectacular dacite dome growth and long-term continuous eruptive discharges

Ibu is one of the most isolated and least accessible volcanoes of Indonesia, located on Halmahera Island, in the province of Maluku, East Indonesia. This volcano is one of the most active volcanoes in Indonesia, but remains poorly studied. Since its resuming activity in 1998, Ibu has injected around 0.7Tg of SO2 into the atmosphere through 60–100 daily eruptive discharges. This long-term eruptive activity is very well retraced by seismic signals that highlight the progressive dome growth and the supply of new magma into Ibu reservoir. The lava dome which is of dacite composition is developing at a rate of 3182m3 per day. This decadal dome growth of Ibu requires further attention and warrants monitoring as it is a hazard and risk concern.

Syphacia (Syphacia) Semiadii N. SP. (Nematoda: Oxyuridae) from Halmaheramys Bokimekot Fabre et al., 2013 (Rodentia: Muridae) on Halmahera Island, Indonesia and A Key to The Species Present in Sulawesi and The Australian Bioregion

Syphacia (Syphacia) semiadii n. sp.is described from Halmaheramys bokimekot Fabre et al., 2013, an endemic murine of Halmahera Island, Maluku, Indonesia. Among the New Guinea/Australian congeners, S. (S.) semiadii n. sp. most closely resembles S. (S.) mamelonitenuis and S. (S.) longaecauda in having a circular cephalic plate without dorsoventral constriction laterally and lacking lateral alae in both sexes. However, this species differs from S. (S.) mamelonitenuis, which has a shorter tail in both sexes and larger eggs, and from S. (S.) longaecauda, which has a longer tail in both sexes. to aid identification, we also provide a dichotomous key to the species of Syphacia in Sulawesi and the Australian bioregion.