The country can be divided geographically into four main regions: the coastal plains in the west, the western highlands, the eastern highlands, and the Rub al Khali in the east. The Tihamah ("hot lands" or "hot earth") form a very arid and flat coastal plain along Yemen's entire Red Sea coastline. Despite the aridity, the presence of many lagoons makes this region very marshy. The evaporation in the Tihamah is so great that streams from the highlands never reach the sea.
The Tihamah ends abruptly at the escarpment of the western highlands. This area receives the highest rainfall in Arabia.
Temperatures are hot in the day but fall dramatically at night. There are perennial streams in the highlands but these never reach the sea because of high evaporation in the Tihamah.
The central highlands are an extensive high plateau over 2,000 metres (6,562 ft) in elevation. This area is drier than the western highlands.
Yemen's portion of the Rub al Khali desert in the east is much lower, generally below 1,000 metres (3,281 ft), and receives almost no rain.n. Only two-three Saturniidae are anticipated in Yemen, and I am not sure if Goodia (Yatanga) arabica is recognized as a distinct species or if it has been synonymized with Goodia (Yatanga) smithi. G. (Y.) arabica was described from a specimen from West-Aden Protectorate, Dhala, 5000 ft.
In 2011, Darge described Yatanga sicca from southern Ethiopia. It is also possible that previous records for one or both of the first two species listed are actually examples of Yatanga sicca.
Goodia (Yatanga) smithi
Goodia (Yatanga) arabica
Goodia (Yatanga) sicca
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