Heteropeza pygmaea

Winnertz, 1846

A minute gall midge ( Cecidomyiidae) described from Europe in 1846. The has been studied extensively for its unusual cytogenetics and developmental , particularly its paedogenetic and dramatic elimination during early embryogenesis. Germ-line contain approximately 58 chromosomes, but somatic retain only 10 chromosomes through programmed elimination of E-chromosomes during cleavage.

Pronunciation

How to pronounce Heteropeza pygmaea: /ˌhɛtɛroʊˈpiːzə pɪɡˈmiːə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Distribution

Recorded from Denmark, Norway, Sweden, and Madeira Island (Portugal).

Life Cycle

Reproduces exclusively paedogenetically in at least some . Early embryonic development involves precise spindle orientation during the first three cleavage divisions to position one among polar at the pole. formation occurs without well-defined nuclear to the surface; nuclei are so large relative to egg size that uniform spacing ensures surface positioning. Central nuclei condense to form nuclei before cleavage complete separation of blastoderm nuclei.

Human Relevance

Has served as an important model organism for developmental and research, particularly regarding elimination, nuclear differentiation, and early embryonic patterning in insects.

Tags

Sources and further reading