Anisosticta novemdecimpunctata (Linnaeus, 1758)

Taxonomy: Polyphaga > Cucujoidea > Coccinellidae > Anisosticta > Anisosticta novemdecimpunctata

Common name: 

Water Ladybird

Images

Anisosticta novemdecimpunctata
Anisosticta novemdecimpunctata

Description

Length: 4mm.  Background colour: July-April, buff/beige; April-June, reddish.  Pattern colour: black spots.  Number of spots: 15-21 (19).  Spot fusions: sometimes.  Melanic (black) forms: no.  Pronotum: buff/beige or red with 6 black spots; rounded at the sides with greatest width in the middle.  Leg colour: pale brown.  Other features: distinctly elongate and flattened in shape.

Fourth-instar larva: thoracic region cream/white with dark patches; abdomen pale grey with alternating rows of black and white tubercles running longitudinally; fine hairs projecting from tubercles.  Pupa: unknown.

Biology

Habitats: Water ladybirds are habitat specialists, occupying reed-beds and grassland in marshy or wet locations.  This species can often be found on the emergent vegetation surrounding ponds.  There are a few records from exposed riverine sediments.      

Host plants: Water ladybirds can be found on tall emergent plants including reeds, reedmace, reed sweet-grass and rushes.

Food: aphids.

Overwintering sites: Water ladybirds overwinter between leaves and in stems of reeds, and in grass tussocks. 

Distribution (may take a minute to appear)