Two new aphrotenian larval types from Chile and Queensland, including Anaphrotenia lacustris n.gen., n.sp (Diptera: Chironomidae) LARS BRÙNDIN Two as yet unknown larvae of the circum-Antarctic subfamily Aphroteniinae, one belong- ing to Paraphrotenia cf. excellens Brundin, the other representing the new genus and species Anaphrotenia lacustis, are described. While the other members of the subfamily are confined to mountain streams, the larva of anaphrotenia has been found in the littoral zone of a shallow subtropical lake on Fraser Island off the coast of Queensland. Besides some peculiar specializations this larva attracts interest because of the primitive construc- tion of the head capsule where the genae ventrally are widely separated and the wide medial interspace is occupied by a longitudinal postmental plate that is not fused with the genal margins. In these respects the Anaphrotenia larva stands out as the most plesiomorphic chironomid larva as yet known; and it comes probably rather close to the larva of the dipteran ancestor. With its closed head capsule and specialized mouth parts the predatory Paraphrotenia larva appears much more apomorphic. But it retains several comparatively plesiomorphous characters, and among the predatory species of the chironomid larvae it represents a very remarkable type.
Insect Systematics & Evolution – Brill
Published: Jan 1, 1983
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