Current Valid Name: Colobopsis sadina
Taxonomic History (provided by Barry Bolton, 2019)
Distribution: Geographic regions:
Not found on any curated Geolocale/Taxon lists.
Endemic to the Fiji Islands Kadavu:
Moanakaka 60, Namalata 100, Namalata 120, Namalata 50, Namalata 75, Namalata 139. Taveuni:
Devo Peak 1187 b, Lavena 300, Lavena 235, Lavena 217, Lavena 219, Lavena 229, Tavoro Falls 160, Soqulu Estate 140, Lavena 235, Somosomo 200, Nagasau. Vanua Levu:
Wainibeqa 87, Kilaka 61, Suene. Viti Levu:
Nabukavesi 40, Vaturu Dam 575 b, Nadarivatu 750.
is endemic to the Fiji Islands where it occurs on all of the archipelago's largest islands. It belongs to the morphologically confusing C. laminatus
complex. In general, morphological characters do not give clear answers regarding species distinctions in the laminatus
complex. It is quite possible that limited gene flow continues to persist among species as delimited here, but the sympatry of both C. sadinus
and C. cristatus
on Taveuni suggests that reproductive isolation has been achieved on at least one island. The majority of the C. sadinus
material was collected from malaise trapping, suggesting it is mostly an arboreal species.
is a black species with legs that vary from black to reddish. The gastral pilosity is sparse and dark. The mesonotal keel projects posteriorly as an acute tooth of variable size. The petiolar node is even apically, or comes to a point, but is never scalloped. See notes under C. levuanus
for how to distinguish it from that species. In the Taveuni specimens, the mesonotal keel projects strongly into a tooth. In Kadavu specimens, the mesonotal keel projects posteriorly into a weak and obtuse angle, and the petiolar node tends to be more pointed apically. In Viti Levu, the single examined specimen has a mesonotal keel that projects weakly into a posterior tooth.
Mann originally described C. sadinus
as a subspecies of C. cristatus
, noting that the soldiers of the former were smaller in size, exhibit a more angular propodeum, and have an indistinct carina on the basal third of the clypeus. He also correctly noted that although the minor workers of both species are identical in size, the mesonotal keel of C. sadinus
projects posteriorly into an acute tooth, and that of C. cristatus
terminates in an obtuse angle. Furthermore, the gastral hairs of C. sadinus
are sparser and darker than those of C. cristatus
. Mann also stated that C. sadinus
is intermediate between C. cristatus
and C. laminatus
Specimens at the MCZC and USNM from the non-type locality of Nagasau bear a red cotype label, but are not true syntypes. The type label of syntype minor worker at the MCZC is 8702, but this may be an error in place of 8720. Furthermore, two pins of C. sadinus
at the MCZC from Nagasau (non-type locality) bear the C. nagasau
cotype label (type no. 8719), but are not true syntypes.
Mann, W.M. (1921) The ants of the Fiji Islands. Bulletin of the Museum of Comparative Zoology, 64, 401-499.
Sarnat, E.M. & Economo, E.P. (In Press) Ants of Fiji. University of California Publications in Entomology.
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