Halobates - Oceanic Insects
Distribution of Sea Skaters
Ó Copyright, N. M. Andersen & Zoological Museum, University of
belongs to the subfamily Halobatinae, essentially an Old World group of water
striders (Gerridae). The sister group of the Halobatini (Gerridae - Halobatinae)
is the tribe Metrocorini with about 100 limnic species distributed in tropical
Africa, continental Asia and adjacent areas of the Palearctic region, and the
Indo-Malayan Archipelago. It does not cross Wallace's line except for a few
species found in Sulawesi. The genus Asclepios (with three marine
species) is confined to South and East Asia. The sister group of Halobates
is the monotypic genus Austrobates which is endemic to tropical Australia
like the most basal lineage of Halobates (subgenus Hilliella) with
three species (Andersen & Weir, 1994a, 1994b).
majority of the 45 extant species of Halobates are found in the tropical
parts of the Indo-West Pacific region, roughly between latitudes 30o
N and 30o S. H. robustus (endemic to the Galapagos Islands)
and the oceanic species H. sobrinus, splendens (eastern Pacific
Ocean), and H. micans (Atlantic Ocean, the Caribbean Sea, and eastern Pacific
Ocean) are the only sea skaters that occur outside this region (Herring, 1961; Cheng,
Andersen (1991) grouped species of Halobates in
a number of monophyletic species groups, each showing a characteristic
distribution. The two species of the subgenus Hilliella are confined to
Australia, as are most species belonging to the Halobates regalis group.
Many Halobates species are endemic to single islands or island groups,
including H. robustus (Galapagos), H. kelleni (Samoa), H.
salotae (Tonga), H. bryani and fijiensis (Fiji), and H.
tethys (Mauritius), but a few coastal species are widespread, such as H.
hayanus White (Red Sea to New Guinea and Australia), H. flaviventris
(East Africa to Vanuatu), and H. hawaiiensis (islands of the
Pacific Ocean). For further distributional details, see Checklist and
Distribution of Halobates.
The widest areas of distribution are found in the oceanic species Halobates micans (all tropical oceans), H. sobrinus and splendens (East Pacific Ocean), H. germanus (Indian Ocean, West and Central Pacific Ocean) and H. sericeus (Pacific Ocean). In the Pacific Ocean, the last mentioned species is absent from a large area North and South of the equator.
present distribution of coastal Halobates species more or less coincides
with the distribution of reef-building corals and mangrove trees which require a
relatively high sea temperature (Andersen, 1998, 1999). The five oceanic species of Halobates
occur in tropical and subtropical waters and their occurrence and abundance on
any given water mass is apparently controlled by surface water temperatures,
with an optimum temperature range for four eastern Pacific species (including H.
micans) of 24-28oC. The absence of Halobates species from
the Mediterranean may in part be due to the surface temperature being below 20o
C at certain times of the year whereas the surface temperature of the Red Sea
varies between 25 and 30o C.
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Andersen NM. 1991. Marine insects: genital morphology, phylogeny and evolution of sea skaters, genus Halobates (Hemiptera: Gerridae). Zool. J. Linn. Soc. 103: 21-60.
Andersen NM. 1998. Marine water striders (Heteroptera, Gerromorpha) of the Indo-Pacific: cladistic biogeography and Cenozoic palaeogeography. In Hall R, Holloway JD (eds), Biogeography and Geological Evolution of SE Asia : 341-354.
Andersen NM. 1999. The evolution of marine insects: phylogenetic, ecological and geographical aspects of species diversity in marine water striders. Ecography 22: 98-111.
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Veliidae, etc.). In Cheng L. (ed.), Marine Insects. North Holland Publ. Co.,
Andersen NM, Weir TA. 1994. Austrobates rivularis, gen. et sp. nov., a freshwater relative of Halobates (Hemiptera: Gerridae), with a new perspective on the evolution of sea skaters. Invertebrate Taxonomy 8: 1-15.
Andersen NM, Weir TA. 1994. The sea skaters, genus Halobates Eschscholtz (Hemiptera: Gerridae), of Australia: taxonomy, phylogeny and zoogeography. Invertebrate Taxonomy 8: 861-909.
Cheng L. 1973. Halobates. Ann. Rev.
Oceanogr. Mar. Biol. 11: 223-235.
Cheng L. 1985. Biology of Halobates
Ann. Rev. Ent. 30: 111-135.
Cheng L. 1989. Biogeography and phylogeny of the sea-skaters Halobates. Chin. J. Oceanol. Limnol. 7: 233-239.
L. 1989. Factors limiting the distribution of Halobates species. In
Ryland, J.S. & Tyler, P.A. (Eds.). Reproduction, genetics, and distributions
of marine organisms.
Fredensborg: Olsen &
Cheng L, Schulenberger E. 1980. Distribution and abundance of Halobates species (Insecta: Heteroptera) in the eastern tropical Pacific. Fishery Bulletin 78: 579-591.
Herring JL. 1961. The genus Halobates (Hemiptera: Gerridae). Pacific Insects 3(2-3): 223-305.
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Last update: 04 september 2002