1,721,101 research outputs found
Insetti di Roma - biodiversità in un ecosistema urbano.
No full textMuseo di Zoologia - Università degli Studi di Roma La Sapienz
Morphology, taxonomy and distribution of Diphyonyx gen. n., a lineage of geophilid centipedes with unusually shaped claws (Chilopoda : Geophilidae)
Full text linkA new genus Diphyonyx is proposed here for a previously unrecognised lineage of geophilid centipedes. It is distinct from
other geophilids in its unique combination of morphological characters, including the peculiar shape of the pretarsus of the legs on
the anterior part of the trunk. The type species D. conjungens (Verhoeff, 1898), comb. n., is redescribed in detail and its geographical
distribution updated (Balkan Peninsula, Anatolia, Crimea). Included in Diphyonyx are also D. sukacevi (Folkmanová, 1956), comb.
n., and D. garutti (Folkmanová & Dobroruka, 1960), comb. n., both from southern Russia. D. garutti is raised here to species rank
New insights and old misconceptions on Plutonium, the largest and the rarest of the Italian scolopenders (Chilopoda).
No full textEffects of canopy and superficial wild-fire on centiped (Chilopoda) communities in Mediterranean forest ecosystems of Central italy
No full textSpecies composition and structure of centipede (Chilopoda) communities were
studied in a sub-urban burnt forest on theMediterranean coast near Roma, Italy.
The study was carried out in two sites affected by canopy fire (complete vegetation
destruction), one affected by surface fire (persistence of tree canopy), and
three unburnt sites. Monthly, quantitative/qualitative samplings were performed
in each site from April 2001 to April 2002 by pitfall trapping and one hour active
search.Analyses of species composition, dominance structure, diversity and colonization
progress were performed. Centipede communities of the sites affected
by canopy fire were simply structured, poor in both species richness and diversity;
conversely, species composition, structure and diversity of the community
affected by surface fire were scarcely modified
FURTHER OBSERVATIONS ON THE ULTRASTRUCTURE OF MATURE SPERM OF SCUTIGERA-COLEOPTRATA (L) (CHILOPODA, SCUTIGEROMORPHA)
No full textMature sperm of Scutigera coleoptrata, taken from the spermatheca, were investigated by scanning (SEM) and transmission (TEM) electron microscopy. The only sperm type observed was of enormous length, the head measured about 500-mu-m and the tail up to 3.5 mm. The acrosome, the smallest found in Chilopoda sperm (0.25-mu-m), showed a bilayered arrangement, described here for the first time. The tail exhibited the typical 9 + 2 microtubular pattern surrounded by a striated cylinder and four mitochondrial derivatives. These were anchored to the striated cylinder by peculiar mitochondrial bridges. The end-piece, never previously described in Scutigeromorpha, showed a small 'plume' under TEM
Spermatophore development and sperm ultrastructure in Craterostigmus tasmanianus (Chilopoda, Craterostigmomorpha)
No full textSpermatophore development and ultrastructure of the mature sperm of Craterostigmus tasmanianus were studied using light and electron microscopy. In C. tasmanianus, as in the Scolopendromorpha, the spermatophore develops within the vas deferens. The latter consists of three parts, each with a different morphology. The first may be involved in guiding the sperm to roll up into typical ring-like structures, while the other two, which show an evident secretory activity, secrete the acellular wall of the spermatophores. The ultrastructure of mature spermatozoa showed that a very close similarity exists between Craterostigmorpha and Lithobiomorpha, especially regarding the organization of the connecting piece. Based on this similarity, we consider the Craterostigmomorpha together with the Scolopendromorpha, Geophilomorpha and Lithobiomorpha (=Pleurostigmophora) to be the sister group of the Scutigeromorpha
Austropotamobius pallipes (Lereboullet, 1858) sensu lato (Gambero di fiume) A. torrentium (Schrank, 1803)
No full textEND-PIECE FORMATION DURING SPERMIOGENESIS OF SCOLOPENDROMORPHA (CHILOPODA)
No full textEnd-piece formation during spermiogenesis of two species of Scolopendromorpha, namely Scolopendra cingulata and S. clavipes, was examined by transmission and scanning electron microscopy. Four important steps characterized the morphogenetic process: 1) preservation of a cytoplasmic appendage (plume) at the end of the tail; 2) formation of a short, longitudinally striated manchette; 3) migration of this structure inside the plume; 4) removal of superfluous cytoplasm from the plume. These findings are discussed and compared with those of other Centipede orders
- …
