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Megalocoleus stysi sp. nov. Habitus of male and female.
Source publication
Megalocoleus stysi sp. nov. is described from Morocco and its habitus and male and female genitalia are illustrated. An amendment to the key for Megalocoleus Reuter, 1890, is proposed.
Contexts in source publication
Context 1
... hind tarsi: segments II and III of hind tarsus subequal in length (Fig. 4); claws as in Fig. 5. Genitalia. Male: vesica slender, U-shaped; with a thin, straight and acute apex (Fig. 6); secondary gonopore removed far from apex of vesica (Fig. 7); left paramere as in Fig. 8. Female: vagina large and oval (Fig. 9). Ring sclerites subtriangular (Fig. 10). Differential diagnosis. Megalocoleus stysi sp. nov. shows some similarities with M. lunula (Fieber, 1861) in the colouration and vestiture but differs from the latter species in the structure of the vesica. The vesica of M. stysi sp. nov. is thin with a straight apex and the secondary gonopore is removed far from the apex of the ...
Context 2
... Large species. ................................................................ *M. longirostris (Fieber, 1861) -Second segment of antenna much shorter, 1.1 mm long; apex of rostrum reaching middle of abdominal segment VIII. ............................................................... *M. stysi sp. nov. -Second segment of antenna shorter, 1.25 mm long. .................................................... 13 13. Brown pubescence dense, hairs thick; pale pubescence sparse and fi ne. Apex of rostrum surpassing abdominal segment VIII (male) or reaching its basal quarter (female). Corium sometimes with a round, more or less pronounced mark. ..... *M. lunula (Fieber, 1861) -Brown and pale pubescence fi ne and rather dense, evenly ...
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Citations
... L'examen des genitalia mâles est indispensable pour identifi er correctement les espèces dont l'habitus est très semblable ; c'est le cas pour longirostris, lunula, naso, stysi et surtout pour molliculus et mellae, deux espèces quasi indiscernables. Dans cette clé, nous renvoyons aux fi gures données par Matocq (2004bMatocq ( , 2008) de la façon suivante : (M. 2004b, fi g. 00 ; M. 2008 : fi g. 00) et aux fi gures du présent travail par : (fi g. 00). 1. Face inférieure des procoxae pourvue de fortes soies noires érigées, plus ou moins alignées, sans soies claires notables. ...
Les vingt-deux espèces actuellement répertoriées dans le genre paléarctique Amblytylus Fieber ont été examinées. Le genre est redéfini principalement d’après les caractères des genitalia mâles. Dix espèces sont maintenues dans le genre: A. albidus (Hahn 1834), A. amoenus Wagner 1958, A. arnoldiorum Kerzhner 1977, A. brevicollis Fieber 1858, A. concolor Jakovlev 1877, A. crassicornis Wagner 1964, A. jani Fieber 1858, A. montanus Wagner 1974, A. nasutus (Kirschbaum 1856), A. peitho Linnavuori 1997; toutefois, A. amoenus est considérée comme incertae sedis et A. jani comme nomen dubium. Deux espèces sont transférées dans le genre Megalocoleus Reuter: Megalocoleus delicatus (Perris 1857) n. comb., Megalocoleus tarsalis (Reuter 1894) n. comb. Dix espèces sont mises en synonymie; soit avec une espèce d’Amblytylus: A. similis Wagner 1971 n. syn. de A. albidus (Hahn 1834); A. gregarius Linnavuori 1961 n. syn. de A. brevicollis Fieber 1868; A. vittiger Reuter 1899 n. syn., A. longicornis Wagner 1953 n. syn. et A. eckerleini Wagner 1964 n. syn. de A. concolor Jakovlev 1877; soit avec une espèce de Megalocoleus: A. erectus Wagner 1971 n. syn. de M. longirostris (Fieber 1861); A. glaucicollis Kerzhner 1977 n. syn. de M. exanguis (Herrich-Schaeffer 1835); A. macedonicus Wagner 1956 n. syn. de M. naso (Reuter 1879) n. comb.; A. luridus Hoberlandt 1961 n. syn. et A. scutellaris Horvath 1905 n. syn. de M. delicatus (Perris 1857) n. comb. Un lectotype est désigné pour quatre espèces (Lopus nasutus Kirshbaum, Amblytylus vanduzeei Blatchey, Amblytylus scutellaris Horváth, Capsus delicatus Perris). Une clé d’identification pratique bilingue (français et anglais) basée surtout sur des caractères externes tente de séparer les espèces d’Amblytylus. Une clé révisée des espèces de Megalocoleus est également fournie. Les deux genres Amblytylus et Megalocoleus, très semblables par l’habitus, restent difficiles à définir. Seules les plantes-hôtes - des Poaceae chez les Amblytylus, des Asteraceae chez les Megalocoleus - et dans une moindre mesure la vesica pourvue de deux processus apicaux (Amblytylus) ou d’un seul (Megalocoleus) semble indiquer l’existence de deux groupes d’espèces distincts.
The roof (dorsal wall) of the female genital chamber (bursa copulatrix) was compared in 31 species representing six subgenera of the taxonomically difficult genus Psallus Fieber, 1858. This investigation tested the potential value of different elements of the dorsal wall (dorsal sac, sclerotized rings, spermathecal gland, lateral oviducts, and infolding of the lateral margins), anticipating diagnostic characters and phylogenetic information for a genus in need of revision. The dorsal sac, a very variable membranous pouch differentiated from the vaginal wall, appears highly informative in providing reliable diagnostic characters at species level; to some extent it may also reveal related species. At subgenus or genus level, the dorsal sac must be examined with other equally informative structures of the roof. In some cases, strong evidence is provided by these structures aiding the recognition of related and unrelated species. The subgenus Pityopsallus Wagner forms a homogenous species-group which does not seems closely related to Psallus s.l. and should be raised to generic status as already proposed by several authors. The subgenus Hylopsallus Wagner appears to gather several species united by at least one synapomorphy after removing unrelated species such as P. (Hylopsallus) callunae Reuter. Also, it is clear that Psallus pardalis Seidenstücker and Psallus jungaricus Vinokurov &Luo should be excluded from Psallus. One or several characters in the roof of some phyline species (Atractotomus Fieber, Campylomma Reuter, Europiella Reuter, Phoenicocoris Reuter, Plagiognathus Fieber, Phylus Hahn, Sthenarus Fieber) appear to be distinct from those of Psallus species.
In Miridae, the roof (dorsal wall) of the female genital chamber (bursa copulatrix) is often neglected in taxonomic studies, rarely represented in its entirety and its importance is usually underestimated. It contains several organs that are relevant for taxonomy and phylogeny, namely the ringed glands (parieto-vaginal glands) encircled by the widely used sclerotized rings, the spermathecal gland (vermiform gland), and the lateral oviducts; it may also display various “dorsal sacs” or pouches and other poorly known structures. The comparison of 24 species belonging to seven mirid subfamilies, and various additional literature data, suggest that the general architecture of the roof and the topographic relations of its different organs may be used to ascertain relationships of higher taxa. Information is mainly provided on the “dorsal sac”, i.e. a very variable pouch-like structure usually medially located in the vicinity of the lateral oviducts and the spermathecal gland. The dorsal sac is derived from the roof of the genital chamber, i.e. is a differentiation of the vaginal wall, and cannot be derived from the common oviduct as claimed by several authors. Apparently, the common oviduct does not exist in Miridae. A dorsal sac, variously shaped, occurs within most subfamilies examined (Cylapinae, Orthotylinae, Phylinae, Bryocorinae, Deraeocorinae, Mirinae). Some representatives of the tribe Mirini and Stenodemini (Mirinae) exhibit two types of dorsal sac. The subfamily Isometopinae as well as some species in each of the other subfamilies examined seem to be devoid of dorsal sac. Apparently, dorsal sacs are adaptive pouches which receive and lodge some parts of the phallus during copulation. At species level, the dorsal sac is informative in providing diagnostic characters. At supraspecific levels (genus, tribe, subfamily) the dorsal sac must be examined jointly with other equally informative structures of the roof: architecture of the sclerotized rings; location of the spermathecal gland; location, length and aspect of the lateral oviducts; aspect and size of the infoldings of the lateral margins of the genital chamber (mainly in Phylinae and Orthotylinae); shape of the genital chamber in dorsal view; and the presence, aspect and size of the paired lateral apodemes of the genital chamber.
The twenty-two species currently placed in the Palaearctic genus Amblytylus Fieber are revised. The genus is redefined principally with reference to characters of the male genitalia. Ten species are retained in this genus: A. albidus (Hahn 1834), A. amoenus Wagner 1958, A. arnoldiorum Kerzhner 1977, A. brevicollis Fieber 1858, A. concolor Jakovlev 1877, A. crassicornis Wagner 1964, A. jani Fieber 1858, A. montanus Wagner 1974, A. nasutus (Kirschbaum 1856), and A. peitho Linnavuori 1997. In this revision, however, we regard A. amoenus as incertae sedis and A. jani as a nomen dubium. Two species are transferred to the genus Megalocoleus Reuter: Megalocoleus delicatus (Perris 1857) n. comb., Megalocoleus tarsalis (Reuter 1894) n. comb. Ten species are placed in synonymy; either with species of Amblytylus: A. similis Wagner 1971 n. syn. of A. albidus (Hahn 1834); A. gregarius Linnavuori 1961 n. syn. of A. brevicollis Fieber 1868; A. vittiger Reuter 1899 n. syn., A. longicornis Wagner 1953 n. syn., A. eckerleini Wagner 1964 n. syn. of A. concolor Jakovlev 1877; or with a species of Megalocoleus: A. erectus Wagner 1971 n. syn. of M. longirostris (Fieber 1861); A. glaucicollis Kerzhner 1977 n. syn. of M. exanguis (Herrich-Schaeffer 1835); A. macedonicus Wagner 1956 n. syn. of M. naso (Reuter 1879) n. comb.; A. luridus Hoberlandt 1961 n. syn. and A. scutellaris Horváth 1905 n. syn. of M. delicatus (Perris 1857) n. comb. Lectotypes are designated for four species (Lopus nasutus Kirshbaum, Amblytylus vanduzeei Blatchey, Amblytylus scutellaris Horváth, Capsus delicatus Perris 1857). A bilingual (French and English) identification key to the species of Amblytylus, based mainly on external characters, is presented. A revised key to the species of Megalocoleus is also given. The two genera Amblytylus and Megalocoleus are very similar in general appearance and remain difficult to define. The existence of two distinct groups of species seems to be indicated only by their host plants (the Poaceae in the case of Amblytylus, and Asteraceae in the case of Megalocoleus), and to a lesser extent by the vesica, with either two apical processes (Amblytylus) or only one (Megalocoleus).
