摘要:

A detailed description of the gas bladder, the Weberian apparatus and the membranous labyrinth inSisor rabdophorusis given. It has been shown that these structures show a number of specializations which can be correlated with the bottom‐living habits of the fish. Evidence has been brought forth to show that the Weberian mechanism continues to serve as an aid to hearing.It has been concluded that Günther's inclusion ofSisorin the group Hypostomatina along with certain loricariid and callichthyid genera is not a natural one and that Regan's (1911) and Berg's (1940) family Sisoridae is more indicative of natural relationships. ThatSisordiverged early from the main stem of sisorid evolution, is further supported by this stu

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1967.tb02123.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

A description of a Uganda strain ofSchistosoma rodhainiBrumpt, 1931, is presented and the data are compared with published data on strains from other Central African localities.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1967.tb02124.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

The development of fry in the mouth of the female mouthbrooderTilapia leucostictaTrewavas is described. The egg production by fish of various lengths is plotted and a curvilinear regression for standard and total length fitted. The number of eggs produced is approximately equal to the square of the total length in centimetres of the parent fish. The brood numbers of 460 females are plotted against length, and linear regressions for mean brood number and mean fry number fitted. The relationship between the expressions for numbers of fry brooded and egg production gives an estimate of brooding efficiency that decreases with increasing parent length. Individual female fish show signs of reripening and the timing of this process is estimated from gonad state and from the length of fry brooded in the mouth. The relationship between fecundity (egg production) and fertility (fry brooded) is considered and the effect of maturation size, growth rate and spawning frequency assessed.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1967.tb02125.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

Samples of beech litter were taken from a site in Lambridge Wood, near Henley‐on‐Thames, Oxon. during the period May 1963 to November 1964. Peaks and trends in the densities of each of the stages ofC. ischnochelesclarify the earlier work of Gabbutt&Vachon (1963) especially for the postwinter period. Most of the protonymphs appear during July to September and the majority overwinter as deutonymphs. Growth recommences the following spring, peak densities of tritonymphs are achieved in May to June and maturity is attained July to August. Mortality in the prewinter period is at least 85% and about 50% occurs during the protonymphal stage. The adults in August belong to at least two different generations. about 40% have recently matured, the remainder have bred at least once before. Mention is made of the densities achieved by bothN. muscorum andR. lubricusin relation to the very high overall densities recorded on the s

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1967.tb02126.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

The midlittoral trochid,Monodonta turbinata(Born) has a higher rate of oxygen consumption in air than in water at temperatures between 15 and 25d̀C. The temperature coefficient of its oxygen consumption is higher for the temperature interval 15 to 25d̀C than it is for the interval 5 to 15d̀C. The aerial oxygen consumption is increased by forced emersion or immersion for 24 hours. Immersion has the greater effect. It would appear that the trochid shows respiratory adaptation to zonation and environmental temperatu

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1967.tb02127.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

Using a colorimetric method, values for serum iron and total iron binding capacity were determined in 33 feral Soay sheep, 32 domesticated Soay sheep, and nine Welsh Mountain sheep. The feral flock showed a higher mean total iron binding capacity than the domesticated Soay flock and the feral males showed a mean serum iron level higher than that of the males of the domesticated Soay flock. Within the feral flock the adult males showed a serum iron level higher than that of the adult females. Within the domesticated Soay flock the serum iron level of the male lambs was higher than both that of the female lambs and that of the male adults. The serum iron level and total iron‐binding capacity of the Welsh Mountain flock were lower than those of the Soay sheep. Results of other workers have been liste

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1967.tb02128.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

Techniques in the application of serological studies to the family Planorbidae are described. Some results obtained using hyperimmune rabbit sera are given and reasons are outlined for the final decision to use egg albumen antigens for future taxonomic work.

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1967.tb02129.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY

摘要:

The Australian snakes that have been included inAspidomorphusdiffer markedly from that genus, particularly in hemipenial morphology and in the absence of a muscular slip from the quadrate bone to the venom gland; the genusAspidomorphusis therefore restricted to the New Guniea species.Aspidomorphus(as here restricted) is closely related toDemansia(in the restricted sense of Worrell, essentiallyD. psammophis, D. torquata, andD. olivacea), but the Australian species generally referred toAspidomorphusseem to be related toGlyphodon. The generaAspidomorphus, Demansia, RhinhoplocephalusandDrepanodontisform a natural group.Aspidomorphuscontains three species, each identifiable by hemipenial features as well as by details of colouration:A. muelleri(=A. mülleri mülleriandA. m. interruptusof Brongersma's revision);A. lineaticollis(=A. mülleri lineaticollisandA. m. lineatusof Brongersma); andA. schlegeli.The last species differs from the others in the form of the maxillary bone and the anterior mandibular dentition; it seems to be confined to northwestern New Guinea and adjacent islands, since specimens from the eastern end of New Guinea that had been referred to schlegeli are actuallyA. lineaticollis.In all three species some geographical variation can be demonstrated, at least in ventral count, but it is not considered necessary to use trinomials to indicate that geographical variation exists.Pseudonaja textilisis recorded from New Guinea for the first time. (McDowell.)Examination revealsDemansia ornaticepsis properly referred toDemansia.(Cogge

ISSN:0952-8369    

DOI:10.1111/j.1469-7998.1967.tb02130.x

出版商:Blackwell Publishing Ltd    

年代:1967

数据来源: WILEY