摘要:

Diurodrilus westheideisp.n. is described in terms of the location of the sensoria, ventral ciliated cells, ciliophores, adhesive toes and a big anal cone. Specimens were collected in mid winter at Disko Island, West Greenland. The ultrastructure ofD. subterraneusRemane, collected in the summer at Disko Island and Ystad, Sweden, is discussed with new information on the systematic status of this aberrant genus as indicated by the cuticle, pharyngeal area, ciliophores and the spermatozoa. Diurodrilidae fam.n. is introduced for the genusDiurodrilus, here placed in Polychaeta.

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1982.tb00514.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Theridiid spiders of the genusSteatodapresent in Israel and Sinai have been revised. All type material previously described from the Middle East, along with species from adjacent regions have been re‐examined. Comments are given on species newly placed inSteatodaand the following new synonyms are defined:Steatoda signataO.P.‐Cambridge, 1876 =Steatoda erigoniformis(O.P.Cambridge, 1872);Lithyphantes ochraceusSimon, 1908, along withTeutana argenteaCaporiacco, 1933 =Steatoda ephippiata(Thorell, 1875);Lithyphantes gerhardtiWiehle, 1934 =Steatoda maura(Simon, 1909). The presence of six species formerly reported from this region has been confirmed, and the occurrence of another three species previously unknown from Israel and Sinai, has been proved. All are newly described. The male ofS. latifasciataand the female ofS. dahliare described for the first time, and a description ofS. xerophilasp. n. is given. Systematic, ecologic and available zoogeographic information on taxa treated are discussed. Key and illustrations of diagnostic characters of each species are provi

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1982.tb00515.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Ultrastructural data from 108 species of Chrysomeloidea show that all rhabdom‐patterns can be assigned to one of two basic patterns. The insula‐pattern: two central rhabdomeres (Rh 7/8) are spatially isolated from the six peripheral ones (Rh 1–6). The ponticulus‐pattern: Rh 7/8 fuse at two sites with the ring of Rh 1–6. The distance between the two systems may prevent optical or electrical coupling in the insula‐p. The structure of the ponticulus‐p may allow electrical coupling as well as contrast‐intensifying lateral filtering. Potential relative polarization and absolute sensitivities differ interspecifically between homologous cells and intraspecifically between Rh7/8 and Rh 1–6, and between Rh 7 and Rh 8. The Bruchidae show only the insula‐p, the Chrysomelidae and Cerambycidae both. The distribution of the two patterns is subfamily‐specific within the Chrysomelidae, but not in the Cerambycidae. Identical patterns must have developed convergently within the Chrysomeloidea. Both basic patterns are subdivided in different

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1982.tb00516.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

The antenna ofSphecodesbees were investigated as regards the type and distribution of the sensilla. Eleven species originating from Sweden were used. Totally 325 specimens were studied. The distribution of sensilla placodea and sensilla trichodea on the antennal segments were studied in the light stereomicroscope. One to three antennae per species were also examined by SEM. The following types of sensilla were found: s. placodea; pit organs; s. campaniformia; s. basiconica; s. trichodea A, B and CD; and setae. The distribution of sensilla, especially s. placodea and s. trichodea A, was found to be species‐specific in the male sex and their diagnostic value in taxonomy is stressed. In the female sex no specific characteristics were found, although two groups could be distinguishe

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1982.tb00517.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY

摘要:

Horny projections arising from single cells, or unculi, of ostariophysan fishes are described and discussed by several workers, but they occur in many more families and genera than previously reported and their status as a key adaptive feature has not been recognized. Unculi are related morphologically to the relatively well‐known multicellular horny tubercles (including breeding tubercles) of Ostariophysi and other fishes, but differ from them in anatomical distribution and function. Unculi are especially prominent features of portions of the epidermis in Cyprinoidei (carps, loaches, and their allies) and Siluroidei (catfishes); they also occur in Characoidei (characins) and Chanoidei (gonorynchs) but have not been found in any non‐ostariophysan fishes. Unculi evidently are functionally significant on the lips and other mouth parts (especially in groups lacking jaw teeth), on the ventral surface of the paired fins in many bottom‐dwellers, and on several neomorphic features including epidermal plaques and tubercles in various catfishes, the thoracic adhesive disc of sisorid catfishes, and the mental adhesive disc of the cyprinid genusGarra. In some sisorid and akysid catfishes virtually the entire external body surface is covered by unculiferous plaques or tubercles. Possible functions of unculi include: mechanical protection of the skin, rasping, adhesion, and hydrodynamic effects. Unculi seem to have been especially important in the diversification of cyprinoid feeding habits and in the adaptation of bottom‐dwelling cyprinoids and siluroids to swift‐water habitats, especiall

ISSN:0300-3256    

DOI:10.1111/j.1463-6409.1982.tb00518.x

出版商:Blackwell Publishing Ltd    

年代:1982

数据来源: WILEY