A New Species of the Genus Parasa Moore (Lepidoptera: Limacodidae) from Yemen

A new species Parasa dusii Solovyev and Saldaitis from northern Yemen is described (holotype in Museum Witt, Munich; Germany). The species has tendency to lose the green pigment typical for other congeners. It is provisionally placed into the genus Parasa Moore, 1859 where it is closely related to P. divisa West, 1940, P. catori Bethune-Baker, 1911, P. marginata West, 1940, P. thamia Rungs, 1951, P. dentina Hering, 1932, P. ananii Karsch, 1896, and P. semiochracea Hering, 1933. The relationship of the new species to these African species suggests its secondary penetration into the Arabian Peninsula from an origin in tropical Africa. The problems of monophyly of the genus Parasa and several associated genera are briefly discussed. All important characters of the new species, and some related species, are illustrated.


Introduction
A new species of the genus Parasa Moore, 1859 is described that was found in northern Yemen by the junior author. This unique species is very interesting in its relationships and zoogeography. The species is quite different in wing coloration as the typical green pigment is often changed to reddish yellow, and the forewing pattern and male genitalia are close to some African species of Parasa.
At present, the genus Parasa Moore, 1859 includes about 250 species worldwide and ranges mainly in the tropics and subtropics. Its monophyly is not evident, and the species from America, Asia or Africa are rather different, with the presence of distinct groups of species endemic to each region. Perhaps, the distribution of the genus Parasa auct. is limited to America, and in other regions the green species has evolved in other phylogenetic lineages. The revision of Asian "Parasoid" species is in preparation, and so far, close generic relationship with American species has not been found. The African species of this complex includes about 100 described species and at least five easily recognized groups that include, respectively, the type species of the names Latoia Guérin-Méneville, 1844, Stroter Karsch, 1899, Delorhachis Karsch, 1896, Lemuriostroter Hering, 1957, and Letois Felder, 1874. Weak diagnoses of these genera have caused the misplacing of a large number of species. Sometimes several genera of the mentioned are regarded as synonyms (Eecke, 1925;Holloway, 1986;Freina & Witt, 1990) but it is not confirmed here. A comprehensive revision is needed, and the present paper makes some steps toward achieving it.
A new species is provisionally placed into the genus Parasa that is in accordance with the very broad but questionable concept of the genus Parasa. The exact generic placement of the new species will be possible after revision of Parasa worldwide. Its generic diagnosis is not clear and needs further investigation and testing.

Material and Methods
The specimens were collected using standard methods with a black light bulb.
The male genitalia were examined using standard methods. The apex of the abdomen was macerated in 10% solution of alkali in a water bath for 10 minutes. The genitalia were dissected using micro-forceps; the aedeagus was separated and stained with Evans blue dye for 5 minutes for staining of vesica. The genitalia were then mounted in Euparal and labeled.
Digital images were made using a Nikon (www.nikon.com) Coolpix 5400 camera and a binocular microscope MBS-9. The images were improved and prepared for publication using Corel Draw 13 and Corel Photo-Paint 13 (www.corel.com).

Parasa dusii Solovyev and Saldaitis, new species
Male: (Figures 1, 2, 3) The moths are robust, medium-sized with forewing length 10.5-12.0 mm and wingspan 24.0-25.0 mm. The head is green or brown. The antennae are brown, broadly bipectinate in basal quarter and almost filiform distally, with total length of 2/3 forewing. The labial palps are covered by Journal of Insect Science | www.insectscience.org 3 brown scales, with yellow terminal segment; their 2 nd segment is medium-sized, as long as a half of the eye diameter; the 3 rd segment is short, as long as one third of the 2 nd one ( Figure 3, "P.lab II" & "P.lab III"). The thorax is green or reddish yellow, like the medial part of the forewing. The forewings are elongated, with concave costa, brown, with large green or reddish yellow medial area that reaches the costa and dorsum, with dark brown basal part and paler distal one. The distal border of this medial area is dark brown, sinuous, running from 2/3 costa to 2/3 dorsum, with characteristic strong curvature near the costa. The border of the medial and brown basal areas, running from 1/3 costa to 1/3 dorsum, is clearly defined. The hindwings are pale yellow with grizzly grey tint. In the forewing, the vein R1 is not sinuous; the vein R5 is branched from the basal part of the branch R3+R4; the medial stem is dichotomous divided over its distal third; the veins M2 and M3 are well separated basally. The hindwing venation is typical for the Limacodidae (Janse, 1964;Holloway, 1986), the veins Sc+R1 and Rs are anastomosed basally. The abdomen is pale yellow, with a brown basal spot dorsally. The tibial spurs formula is 0-2-2.  Hering, 1932 (TL: Nigeria), P. ananii Karsch, 1896 (TL: Togo), and P. semiochracea Hering, 1933 (TL: Sierra Leone) (Figures 6-9, 12-15) but the distal brown forewing area of the new species is bounded by a dark brown facia, sinuous, with strong curvature near the costa, running from 2/3 costa to 2/3 dorsum; the medial forewing area is green or reddish yellow; the thorax is green or reddish yellow. The male genitalia of new species differ from mentioned species by the narrow, not curved up distally valvae.

Biology:
The specimens were collected in early January and late March in Wadi Bura (600-700 m) and Wadi Sara (1200 m) valleys situated on the western slopes of Asir Mountains facing savannah type Al Hudaydah plane and Red Sea. Wadi Burra and Wadi Sara are in the Jebel Burra mountains area where minor subtropical rainforests with rich flora of different plant associations are still left (Figure 18).  Figures 1-5. Parasa dusii sp. n.; 1 -Male holotype; 2 -Male paratype (from Wadi Bura); 3 -head of the paratype (from Wadi Bura), lateral view; 4 -male genitalia of the holotype, aedeagus separated, back view; 5 -male genitalia of the paratype (from Wadi Bura), lateral view. Abbreviation: "P.lab. II" and "P.lab. III" means the second and third segments of labial palps correspondingly. High quality figures are available online.
The specimens with both types of coloration are included in the type-series. Cases of such substitution of the green pigment by yellow or brown are known also for other Limacodidae and may cause description of numerous synonyms. For example, three related species, Latoia albicosta (Hampson, 1910), L. intermissa (Walker, 1865) and L. anagaura Janse, 1964 (generic combinations are given provisionally) from southern Africa are probable synonyms and characterized by the same forewing pattern but the colorations are different. The species L. intermissa has green pigment on the thorax, head and forewings, but this pigment is substituted by ochre in L. albicosta and L. anagaura. The male genitalia of all three species are rather similar and hardly distinguishable, with a very long aedeagus bearing an apical incision and two small spurs, very broad gnathos and apically prominent juxta with tape-like process underlying the aedeagus. Such colour substitution can be related to ecological factors or development of reproductive isolation from closely related species involving recognition of the species. These hypotheses need further investigation.
Taking into account the forewing pattern and Plate 3. Figures 12-17 the features of the male genitalia, the species dusii sp. n. may be closed to Parasa divisa West, 1940, P. catori Bethune-Baker, 1911, P. marginata West, 1940, P. thamia Rungs, 1951, P. dentina Hering, 1932, P. ananii Karsch, 1896, P. semiochracea Hering, 1933, Delorhachis amator Hering, 1928, and Stroter comatus Karsch, 1899. Some of these species and their genitalia are illustrated for comparison (12)(13)(14)(15)(16)(17). The species amator (Figures 10, 16) has reduced forewing pattern with a small yellow spot near 1/3 dorsum; currently it is mistakenly regarded as a member of the genus Delorhachis Karsch, 1896 and its exact systematic position needs investigation. All species listed, including the new one, are characterized by a complex of the following diagnostic features. The male antennae are broadly bipectinate in basal quarter, simple distally. The forewings are elongated, with concave costa. The forewing pattern consists of a basal brown area, pale brown distal area, and a medial area of any distinct color (green or different tints of yellow). The male genitalia are mostly diagnostic, with the uncus triangular in shape when viewed dorsally, lacking any spur; the gnathos is wide, strong and narrowed distally. The valvae are without saccular processes but with distinct sacculus and narrow weak cucullus. The juxta is unmodified, flattened. The aedeagus is tube-shaped, without any apical process. The vesica is without cornuti.
The relationship of all mentioned species is probable, but no unique features have been found so far except this complex of diagnostic characters. As stated above, the species are regarded as members of different genera in spite of their close relationship. Their generic combinations are still provisionary until a revision of the "Parasoid" complex is made and the diagnoses of all involved genera are improved. It seems to be likely that P. dusii sp. n. penetrated the southern Arabian Peninsula from continental Africa where closely allied species are distributed. The new species was collected in Wadi Bura and Wadi Sara in wet subtropical forests similar to those of eastern Africa. The presence of the species here shows that the south-west of the Arabian Peninsula has strong influence from the Ethiopian zoogeographic region. A similar invasion to the north from southern and central Africa is known for a related species from the "parasoid" complex, Parasa thamia Rungs, 1951, known from north-eastern Morocco and is considered to belong to the Palaearctic fauna (de Freina & Witt, 1990: 43). It is also known for the south-western Palaearctic Coenobasis farouki Wiltshire, 1947, ranges to Sinai [Egypt] and southern Oman (Wiltshire, 1990); the remaining 9 congeners of Coenobasis Felder, 1874 are found only in the Ethiopian region (Hering, 1928;Janse, 1964). In northern Oman the limacodid species Deltoptera omana Wiltshire, 1976 is also known and its relation to South African region is discussed in Wiltshire (1990).