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Issue: Vol. 5583 No. 3: 4 Feb. 2025
Type: Article
Published: 2025-02-04
DOI: 10.11646/zootaxa.5583.3.2
Page range: 437-461
Abstract views: 95
PDF downloaded: 31

Four new adelgid (Hemiptera: Adelgidae) species from Bhutan, including the first legless species of Aphidomorpha

USDA Forest Service; Northern Research Station; Hamden; CT 06514; USA
Agriculture and Agri-Food Canada; Ottawa Research and Development Centre; Ottawa; Ontario K1A 06C; Canada
USDA Forest Service; Northern Research Station; Hamden; CT 06514; USA
Department of Forest and Park Services; Ugyen Wangchuck Institute for Forestry Research and Training; Bumthang; Bhutan
Hemiptera eastern himalayas apodal apodous gall hemlock fir larch pine spruce

Abstract

A new subgenus and four new species of Adelges (Hemiptera: Adelgidae) are described from Bhutan. To support their taxonomic placement, we provide a phylogeny of Adelgidae reconstructed using mitochondrial and nuclear DNA sequence data. Cassiadelges subgen. nov is distinguished by the combination of feeding on Larix secondary hosts, having tergites of the head and pronotum fused into a cephaloprothoracic shield, and having only acuminate setae on the terminal abdominal segments. Adelges (Cassiadelges) coccipus sp. nov. feeds on Larix griffithii. This remarkable species is the only known member of Aphidomorpha that is lacking legs. The first instar nymph has legs, while the second instar to adult have vestigial legs present as small cuticular protrusions with clusters of setae. Its discovery presents an exciting opportunity to examine the evolutionary development of insect limb formation from a new perspective. Adelges (Cholodkovskya) changaphuensis sp. nov. feeds and forms galls on Picea spinulosa. Adelges (Aphrastasia) densae sp. nov. feeds on Abies densa. This may be the same as what was reported on this host in 1985 as Chermes abietispiceae Stebbing (nomen dubium). Adelges (Annandina) lepsimon sp. nov. feeds on Tsuga dumosa. It is separated from the only other member of its subgenus, Adelges (Annandina) tsugae Annand, by first instar exules having a pair of prominent anterior cephalic wax glands. It feeds between the needles on twigs in a similar fashion to A. (An.) tsugae Annand, which is also found in Bhutan, making it difficult to distinguish them in the field.

 

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