Cosmophasis ombria

C. ombria is distributed across Indonesia, including Sumatra, Java, Sulawesi, and the Krakatau Islands, with records also from Hainan in southern China.^[1][5] The species has been collected from various locations in the Krakatau Islands, including Anak Krakatau, Pulau Krakatau Kecil (Panjang), and Pulau Sertung.^[5]

Males have a cephalothorax covered in pearly scale-hairs that are more numerous on the sides and anterior to the eye-field, which has a metallic shine.^[5] The eye-field is dark brown with black eye surroundings, and there is a fringe above the anterior eyes. The abdomen is mottled brown, darkening posteriorly, with a light creamy belt around the anterior half and a cream central longitudinal stripe with paired spots on the sides.^[5]

Females have a brown cephalothorax with a greyish-light brown eye-field containing numerous creamy scales and scattered brown bristles.^[5] The thoracic area and sides are lighter and mottled orange with white scales. The abdomen is covered with brownish scale-hairs and displays a pattern of three yellow transverse stripes joining a central longitudinal stripe, with a wide yellow stripe bordering the anterior abdomen.^[5]

The male palpal organ is characterized by a relatively small tegulum and a long, wavy embolus positioned at 9 o'clock.^[5] Females have epigynal fossae without distinctive borders, divided by a wide median guide, with a strongly sclerotised posterior epigynal edge and elongate, L-shaped spermathecae.^[5]