摘要:

Twenty‐five species and two subpecies of aphids are listed and dicussed as additions to the Brutish fauna since publication of “Additions and amendment to the Cheack List British aphids” subspecies is described as new to si

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01079.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Two rows (anterior and posterior) of long fine setae inserted on the 3rd, 4th and 5th segments of the last two pairs of legs ofL. americanaform functional swimming blades. Each swimming setal is mounted in a mobile basal socket, and the structure of the setal base and socket configuration ensure that the blades will be passively erected during the leg's power stroke to provide increased thrust and collapsed during the recovery stroke to reduce water resistance. The erect swimming blades increase the effective area for thrust by approximately 500%, making it possible for the mite to lift itself off the bottom. The IVth legs contribute the greater proportion of the thrust developed during paddling, and the 4th segment (genu) bears the largest swimming blades on both legs.

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01080.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Two new species ofEurycestusClark 1954 are described from the American avocetRecuruirostra americanaGmelin 1788.Eurycestusis a genus of disproportionately wide cestodes in which suckers and rostellum are apparently wanting and which have complete duplication of reproductive system in each segment. The new speciesE. falciformisandE. latissimusspp. nov.differ from E.avocetiClark 1954;E. falciformisresemblesE. avocetias figured in Clark's (1954) plate I, E.latisrimusresemblesE. avocetias depicted in Clark's (1954) plate II, but the three species differ, the diagnostic characters being shape of the strobila, size of the cirrus‐sac, number of testes and armature of the cirrus, the last mentioned being the most easily recognized constant differentiating character.E. latissimusmeasuring up to 33 mm broad, and less than 1 mm in length, has, in each side, 31–44 testes, a cirrus‐sac 333–447 μm long by 45–47 μm in diameter and a cirrus with 14–16 longitudinal rows of strong rose‐thorn‐shaped spines, measuring 7 μm high; whileE. falciformis, 12–20 mm wide by 1.7‐2.4 mm long has, in each side, 27–35 testes, a cirrus‐sac 355‐320 μm long and 43‐35 μm in diameter with a cirrus armed with 20–24 longitudinal rows of slender spines 4.5 μm long. In the holotype ofE. avocetithe cirrus‐sac measures 240–260 μm long by 55‐51 μm in diameter and the cirrus is armed with over 40 longitudinal rows of minute spines 1.5‐2 μm long. It also shows a reticulate uterus but the number of testes cannot be determined in it.A young avocet(R. auosetta)taken in the Camargue in the south of france was found by Baer (1968) to contain free, scolex‐less strobilae which he identified asE. avocetiClark in addition to separate scoleces embedded in the intestinal mucosa. He considered that the scoleces, dilepidid in type, belonged to the free strobilae, which if correct, adds to our knowledge ofE. avocetiC

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01081.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

ColdPseudechis porphyriacusaid heating by basking, flattening and tilting. When body temperatures are higher, thermoregulation is achieved by shuttling between sun and shade. A warm snake in a cooling environment frequently coils.The major factors associated with rate of temperature change in the body core were (1) horizontal gradient between body and neck, (2) posture and (3) vertical gradients from body core to body surface.The role of behavioral, physiological and physical factors in thermoregulation are discussed.

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01082.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Display behaviour in a small species of Indian praying mantis,Ephestiasula amoena, is described and the possible role of this display in courtship is discussed. The display involves exposure of the bright pattern on the inside face of the expanded plate‐like profemora. The profemoral patterns found in closely related species are discussed and it is suggested that the display may also play a role in species recognition. The courtship behaviour ofE. amoenais contrasted and compared with the courtship of other species of praying manti

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01083.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01079a.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY