Medleria gen. nov. adds to the biodiversity of Flatidae (Hemiptera: Fulgoromorpha) in the island of Socotra Author Świerczewski, Dariusz Author Malenovský, Igor Author Stroiński, Adam text European Journal of Taxonomy 2018 422 1 19 journal article 30188 10.5852/ejt.2018.422 6120b578-2257-4568-afd9-33e8f695815e 1228324 06F426FF-A9CC-4B0A-A921-A51031F9BCDB Medleria caudata gen. et sp. nov. urn:lsid:zoobank.org:act:BF1F8ADE- 2703-41 DE-B80F-FDE9F50F452C Figs 1–10 Diagnosis The only species in the genus; see diagnosis for the genus. Etymology From the Latin adjective ‘ caudatus ’ (= tailed, caudate). The specific epithet refers to the prolonged apical part of the tegmen. Type material examined Holotype YEMEN : ♂ , [ YEMEN , SOCOTRA Island / Dixam Plateau , 850-920m / N 12°31′24″ , E 53°58′29″ / 5.ii.2010 / L. Purchart & J. Vybiral leg.], [COLLECTIO / Moravské museum / Brno], dry-mounted, abdomen detached, dissected and stored in glycerol in a glass microvial ( MMBC ) . Paratypes YEMEN : 3 ♂♂, 4 ♀♀, all specimens with the same collecting data as for the holotype, all dry-mounted, abdomens of some specimens detached, dissected and stored in glycerol in a glass microvial ( MMBC : 2 ♂♂ , 3 ♀♀ ; NMPC : 1 ♂ , 1 ♀ ) . Description SIZE. Total length 4.02–4.07 mm . COLORATION. Ochreous, mottled with small dark brown to black markings on upper part of frons, lateral parts of mesonotum and scutellum, median portion of tegmen, tubercles on clavus and bulla, apical part of tegmen largely dark; abdominal sternites dark brown with yellow margins, legs brownish ( Fig. 1A–E ). HEAD. Vertex: A / B = 3.00–4.29; anterior margin delicately arcuate; lateral margins almost straight and parallel, posterior margin sharp and elevated, almost straight; disc of vertex weakly depressed ( Figs 1E , 2D–F ). Frons: C / E = 0.83–1.00; D / E = 1.17–1.41; median carina reaching frons middle, lateral carinae distinctly longer than median one; area between bases of median and lateral carinae as well as area between lateral carinae and lateral margins depressed ( Figs 1D , 3C–D ). Disc of clypeus flattened. Fig. 1. Medleria caudata gen. et sp. nov. , paratype, ♂, stereomicroscopic photographs. A–B . Habitus. A . Lateral view. B . Dorsal view. C–E . Anterior part of body. C . Lateral view. D . Frontal view. E . Dorsal view. THORAx. Pronotum: F / B = 1.50–2.14; anterior margin medially produced and flattened, posterior margin widely concave ( Fig. 2C–E ). Mesonotum: G / F = 2.00–2.31; G / B+F = 1.25–1.61; G / H = 0.70–0.75; area between median and lateral carinae depressed ( Fig. 2C–F ). Tegmen: I / J = 1.59–2.08. Metatibia with apical row of seven well-developed spines, external spines longer than ventral ones; basitarsomere with 7 apical spines; second tarsomere with two lateral spines. Fig. 2. Medleria caudata gen. et sp. nov. , paratype, ♂, SEM photographs. A–B . Habitus. A . Lateral view. B . Dorsal view. C–D , F . Anterior part of body. C . Dorsal view. D . Dorso-lateral view. F . Frontal view. E . Head and pronotum, dorsal view. MALE TERMINALIA. Anal tube, in lateral view, with ventral margin weakly convex and dorsal margin weakly concave in median portion, postero-dorsal angle right ( Fig. 5A–B ). Genital style with posterior margin straight, ventral and dorsal margins almost straight, subparallel, postero-ventral angle bluntly rounded, not extending the posterior margin ( Fig. 6A–C ). Appendage of dorsal periandrium with well-sclerotized small teeth in its median curved part ( Fig. 6E ). Dorsal part of aedeagus membranous ( Fig. 6G ). Fig. 3. Medleria caudata gen. et sp. nov. , paratype, ♂, SEM photographs. A–B . Mesonotum. A . Dorsal view. B . Dorso-lateral view. C–D . Frons. C . Frontal view. D . Fronto-lateral view. E . Antenna, dorsoapical view. F . Rostrum. FEMALE TERMINALIA. Pregenital sternite with posterior margin convex medially, anterior margin concave ( Fig. 9A ). Anal tube, in lateral view, tapering apicad, with bluntly rounded apex; anus placed anterior to midlength; ventral margin medially weakly arcuate ( Fig. 9C ); in dorsal view, anal tube widest in its median portion, apically truncate, posterior margin almost straight ( Fig. 9B ). Gonoplac with its dorsal part with membranous base, strongly sclerotized median portion and two rows of teeth placed posteriorly–external teeth small and flat, internal teeth huge and hook-like; ventral part weakly sclerotized ( Figs 8D , 9E ). Gonapophysis VIII with dorsal margin bearing three teeth, ventral margin subapically slightly up-folded with four teeth; basal part of gonocoxal process with strongly sclerotized strip ( Fig. 9D ). Spermatheca with ductus receptaculi not divided into two parts, ribbed, widened apically; diverticulum ductus smooth, with narrow basal part and elongate apical bulba ( Fig. 9J ). Two large eggs ( 1.2 mm ) in ventro-dorsal position were discovered during dissection of the female abdomen. Fig. 4. Medleria caudata gen. et sp. nov. , paratype, ♂, SEM photographs. A–B . Tegmen. A . Lateral view. B . Dorso-lateral view. C–E . Apical part of tegmen (“tail”). C . Dorso-lateral view. D . Lateral view. E . Dorsal view. F . Sensory structures. Fig. 5. Medleria caudata gen. et sp. nov. , holotype, ♂, SEM photographs. A , C , E . Abdomen. A . Lateral view. C . Dorsal view. E . Postero-ventral view. B , F . Terminalia. B . Lateral view. F . Postero-ventral view. D . Anal tube, dorsal view. Fig. 6. Medleria caudata gen. et sp. nov. , holotype, ♂, stereomicroscopic photographs and line drawings. A . Terminalia, lateral view. B . Anal tube, dorsal view. C . Stylus, lateral view. D . Periandrium and aedeagus, lateral view. E–F . Periandrium. E . Lateral view. F . Ventral view. G–H . Aedeagus. G . Lateral view. H . Ventral view. Fig. 7. Medleria caudata gen. et sp. nov. , paratype, ♀, SEM photographs. A , C , E . Abdomen. A . Dorsal view. C . Lateral view. E . Ventral view. B . Anal tube, dorsal view. D , F . Terminalia. D . Lateral view. F . Ventral view. Host plant and habitat The type series was collected by beating shrubs on a warm and sunny day, in a sparse semi-arid shrubland on a coarse, stony substrate of a montane limestone plateau ( Fig. 10A–B ). The vegetation was almost uniformly composed of Croton cf. socotranus Balf. f. ( Euphorbiaceae ). This plant species is thus a probable host of M. caudata gen. et sp. nov. ( Fig. 10C ). Fig. 8. Medleria caudata gen. et sp. nov. , paratype, ♀, SEM photographs. A . Pregenital sternite, lateral view. B . Terminalia, frontal view. C–D . Gonoplac teeth. C . Lateral view. D . Frontal view. E–F . Gonapophysis VIII. E . Lateral view. F . Dorsal margin. Fig. 9. Medleria caudata gen. et sp. nov. , paratype, ♀, stereomicroscopic photographs and line drawings. A . Pregenital sternite, flattened, ventral view. B–C . Anal tube. B . Dorsal view. C . Lateral view. D . Gonapophysis VIII, lateral view. E–F . Gonoplac. E . Lateral view. F . Apical part. G–H . Gonapophyses IX and gonospiculum bridge. G . Lateral view. H . Dorsal view. I . Bursa copulatrix with cells, lateral view. J . Spermatheca. Distribution Yemen: Socotra Island; so far only known from the Dixam montane plateau ( 12°31′24″ N , 53°58′29″ E ) in the central part of the island.