Saccharodite is a large genus of planthoppers from the family Derbidae, tribe Rhotanini, with more than 100 species. The largest number of species have been reported from Borneo, Indonesia, New Guinea and the Philippines, but the genus has a much wider distribution, ranging from Sri Lanka in the West, over southern parts of mainland Asia up to southern Japan in the North. Saccharodite is also found in other parts of the western Pacific like Micronesia, Fiji and New Caledonia, up to eastern parts of Australia, in the South as far as Tasmania. The adult hoppers are around 5 mm long from head to the tip of the forewings. They are characterized by their forewing venation. The forewings are usually glassy and bright red marks are common on the head and body, up to most parts except the wings being coloured bright red. When the insects are at rest, the wing surfaces form a common plane like in house flies.
Type species: Saccharodite sanguinea Kirkaldy, 1907 - possible synonym: Saccharodite coccinea (Matsumura, 1940)
In the genus Saccharodite, the largest number of species have been reported from the island of Borneo (43 species). The genus is also well represented in New Guinea (25 species), the Philippines (20 species) and remaining parts of Indonesia (10 species). However, the genus has a much wider distribution, ranging from Sri Lanka in the West (2 species), over southern parts of mainland Asia like Myanmar (2 species), western Malaysia (7 species), Thailand (4 species), Laos (3 species), Vietnam (1 species), southern China (2 species), Taiwan (5 species), and some southern islands of Japan (2 species). In the East and South species of Saccharodite are found in Guam (1 species), Micronesia (4 species), Palau Islands (2 species), Fiji (1 species), the Solomon Isl. (7 species), New Caledonia (6 species) and the northern and eastern parts of Australia (3 species).
The concept of Saccharodite is based on Kirkaldy's (1907) very short description of the genus and the type species, Saccharodite sanguinea. The original text of the latter in French is: "D'un sanguin brilliant; jambes jaunâtres testacées, teintés de sanguin; élytres hyalines, très faiblement enfumées ça et la, veins incolores, sauf qu'une partie de la ligne sousapicale avec les parties des veins longitudinales immédiatement contigues, sons sanguines." No type specimen of Saccharodite sanguinea has been located and the identity of the type species and the genus remains somewhat uncertain.
No additional species have been assigned to Saccharodite until Fennah re-described the genus in 1969, based on the original description and 2 new species from New Caledonia. In his re-description Fennah refers to the hyaline forewings and the bright red body mentioned by Kirkaldy as diagnostic characters for the type species. Fennah's re-description has been accepted based on the principle of the first reviser.
More important for defining the genus are Fennah's illustrations of the forewing venation of his new species, especially a characteristic triangular cell close to the hind margin of the forewing which is marked by an arrow in the illustration of Saccharodite iridipennis on the left. Like in other genera of Rhotanini, the first branch of the media splits close to its base and the inner vein joins the branch of the cubitus to form the basal median cell. However, in Saccharodite, both veins separate again and then join once more, forming the characteristic triangular cell. Both veins fail to separate again in only a few species like in Saccharodite coccinea, see illustration on the left where the joined veins are marked by an arrow. There is another very small triangular cell at the base of the first branch of the media. The triangular cell near the hindwing of the forewing is unique in the tribe Rhotanini and is the main diagnostic character of the genus in combination with 2 other characters, the 4 costal cells and for most species the 6 veins of the cubitus-media complex reaching the margin at the end of the forewings.
Saccharodite coccinea (originally described by Matsumura in 1940 as Rhotana coccinea) has the same features as those described by Kirkaldy for Saccharodite sanguinea and both species may be synonyms. In particular, the blood-red colour of the body and the colouration of the forewing veins match in both descriptions. The type specimen of S. coccinea is also missing, however the species is well defined by the detailed original description. It has a wide distribution range which includes the type locality (Java, Indonesia) of S. sanguinea (see illustration above). However, apart from the unusual forewing venation, it has other characters which are not typical for most species of Saccharodite as defined by Fennah. The forewings are rather elongated, slightly opaque and slightly powdered. In contrast, according to Fennah's re-description, most species of Saccharodite have broader and glassy, unpowdered forewings. These differences contribute to the uncertainty about the taxonomy of this genus.
Bright red marks on the head and the body are common among the species of Saccharodite. For example, the scutellum or even the whole mesonotum might be bright red (see the gallery below and the taxobox on the top right). However, not all species have red marks and it is unusual that most parts of the head and abdomen are blood-red like in S. sanguinea and S. coccinea. The diversity in colouration in the genus is illustrated in the gallery below. In profile, the head is typically evenly rounded, but the junction between vertex and face may be angulated. Like in other genera of Rhotanini, there are ridges on the sides of the vertex and the face, the facial carinae. In frontal view the facial carinae meet at the junction of vertex and face in almost all species of Saccharodite. The size of the species ranges from 4–6.5 mm from head to the end of the forewings. In all species of the genus which have been observed alive, the wings are held in a common plane like house flies.
Like in other genera of the Rhotanini, there is very little information on the biology of the species of Saccharodite. It is assumed that the nymphal stages live in decaying organic matter like other derbids, feeding on fungi. Even information on the host plants the adults feed on is scarce. Several species have been found feeding on coconut and other palms, including Saccharodite coccinea. However, host plant records are rare, even for common species like Saccharodite basipunctulata which has been mainly collected by light traps or malaise traps. In some species it is clear that the adults can be polyphagous, feeding on a variety of plants.
A total of 108 species of Saccharodite have been described (as of 2024) and 81 of these have been assigned to 9 species groups as they show obvious similarities in forewing venation, other morphological features and/or colouration. For example, Saccharodite coccinea and Saccharodite sanguinea form one species group. Five other species groups are briefly described below and their main features are illustrated and marked by arrows:
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Saccharodite".
Except where otherwise indicated, Everything.Explained.Today is © Copyright 2009-2024, A B Cryer, All Rights Reserved. Cookie policy.