Abstract
The first Tomocerus species with a postantennal organ (PAO) in the adult stage is described from Vietnam. Tomocerus postantennalis sp. n. differs from the other PAO-possessing tomocerid, Tomolonus reductus Mills, 1948, mainly in the morphology of PAO, the number of ocelli, the number of chaetae in trochantero-femoral organ and several features of the furca. The new species is placed in Tomocerus because of the presence of a toothlet on the outer basal mucronal tooth and the absence of the diagnostic character states of Plutomurus Yosii, 1956 and Aphaenomurus Yosii, 1956. Besides the presence of PAO, the new species is peculiar in having six prelabral chaetae, instead of four as in other Tomocerus species. The new species is similar to Tomocerus folsomi Denis, 1929 and Tomocerus ocreatus Denis, 1948 in the type of dental spines but different from them in the body colour, the relative length of antennae to body, the number of unguis inner teeth and the number of mucronal intermediate teeth.
Highlights
In Collembola, postantennal organ (PAO) is a paired organ located dorsally on the head, behind the antennae
PAO in Tomocerinae was firstly recorded by Mills (1948) in a new genus and species, Tomolonus reductus Mills, 1948
The purpose of this paper is to describe a second species of this subfamily with well developed PAO, based on material from Vietnam
Summary
In Collembola, PAO is a paired organ located dorsally on the head, behind the antennae. It is probably a sensory organ of smell, humidity or temperature (Altner and Thies 1976). E.g. Onychiuridae and Neanuridae, PAO is morphologically diversified and highly important for taxonomy (Hopkins 1997). PAO in Tomocerinae was firstly recorded by Mills (1948) in a new genus and species, Tomolonus reductus Mills, 1948. Christiansen (1964) claimed this organ did not always appear in all specimens of Tomolonus reductus and rejected the generic state of Tomolonus, but later studies (Yosii 1967, Rusek 1977) supported Mills’ original position PAO in Tomocerinae was firstly recorded by Mills (1948) in a new genus and species, Tomolonus reductus Mills, 1948. Goto (1956) showed that PAO is present in the first instar of Pogonognathellus longicornis (Müller 1776) but disappears in subsequent instars. Christiansen (1964) claimed this organ did not always appear in all specimens of Tomolonus reductus and rejected the generic state of Tomolonus, but later studies (Yosii 1967, Rusek 1977) supported Mills’ original position
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