摘要:

Two species of nudibranch molluscs are described from the northeastern Pacific Ocean on the west coast of North America. These are: a new aeolid species of Cuthona Alder&Hancock, 1855 (family Cuthonidae) from the Oregonian marine zoogeographical province and a new dorid species of Acanthodoris Gray, 1850 (family Onchidorididae) from the Panamic province in the Gulf of California. The internal anatomy and external features of each species are compared with related species. Differences in structure of the radula, reproductive system and other morphological aspects are described. A revision of the family Cuthonidae is included. Evidence is presented to include the genera Trinchesia Ihering, 1879, and Precuthona Odhner, 1929, within the genus Cuthona. Cuthona alpha Baba&Hamatani, 1963, is synonymized with Catriona columbiana (O'Donoghue, 1922). We consider the New World Cuthonidae to be composed of the following five genera: Catriona Winckworth, 1941; Cuthona Alder&Hancock, 1855; Embletonia Alder&Hancock, 1851; Tenellia Costa, 1877; and Tergipes Cuvier, 1805.

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01112.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

The results from a long‐term field study (10 years) and laboratory experiments have been used to develop a simulation model of lime aphid populations. This has revealed that the numbers of this aphid are regulated by an interaction between predation and aphid flight. These normally pre‐empt regulation by aphid induced changes in plant quality causing increased flight and mortality later in the y

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01113.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

A new genus and species of gobiid fish,Egglestonichthys Patriciae, is described from the South China Sea. Certain features of the modified head lateral‐line system resemble those seen in eleotrine genera with ‘transverse’ suborbital sensory papillae, but the skeleton of the new goby is essentially gobiine. Aspects of the lateral‐line system indicate closest relationship with genera from both the IndoPacific area (Callogobiuscomplex,Psilogobius, Stonogobiops) and the New World (Microgobius). Wider affinities with other gobiine and gobionelline genera are discussed. Discrepancies between arrangements based predominantly on lateral‐line characters and on osteology are noted and their implications considered for future classification of the gobio

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01114.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

The alienicolae ofPatchiella reaumuri(Kaltenbach), which is heteroecious betweenTilia x vulgarisHayne and roots ofArumspecies, are here described from material reared onArum maculatumL. andA. italicumMill. in 1977. The sexupara morph is also described for the first time from specimens obtained in the same culture. Key couplets are offered whereby this morph can be separated from sexuparae of other British Pemphiginae.

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01115.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

A fossil land snail from the Oligocene White River Group of Nebraska is described asCaracolus aquilonarissp nov. Living members of the genusCaracolusoccur in tropical forest on the islands of the Greater Antilles. It is likely thatC. aquilonarisoccupied a similar habitat and that the present restricted occurrence of the genusCaracolusis a fragment of a previously wider range. The American carnaenid generaPleurodonte, PolydontesandZachrysiaform a well defined monophyletic group, but there is an unresolved trichotomy involving this group,LabyrinthusandCaracolus. Well characterized fossil camaenids assigned toPleurodonte(Jamaica, Carriacou) and the relatedPleurodontites(Florida) occur in the Miocene. Antecedents toLabyrinthuswere isolated in South America and toCaracolusandPleurodontein North America, possibly in the late Cretaceous. The latter genera reached the Antilles whereCaracolushas persisted relatively unchanged. AncestralPleurodontehas diversified producing the distinctive subgeneraEurycrateraandThelidomuson Jamaica and the genusPolydonteson the other Greater Antilles. Drier conditions on Cuba have resulted in the divergence ofZachysiafromPolydontes.

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01116.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY

摘要:

Pinaciophora spiculatasp. nov. is described on the basis of two complete periplasts collected in arctic Canada at—l°C in 1973. One has been tested for silicon by means of X‐ray microanalysis with strongly positive results. The species possesses dimorphic scales, the spicular scales and exceptionally small plate‐scales being equally diagnostic. The circumstances under which the name has already appeared in the literature are explained. In addition, the known ranges of two other taxa are extended by broken periplasts recovered from other arctic or subarctic areas, notablyP. denticulataThomsen (plate scales only) formerly known from Peru and now from South Alaska (at Homer) while the type species of the genus (Poturnodiscus kalbeiGerloff 1968=Pinaciophora fluivatilisGreeff 1875) is demonstrated both from South Alaska and from beneath sea ice in North Alaska, in both localities possibly introduced into the sea by freshwater dr

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1979.tb01117.x

出版商:Blackwell Publishing Ltd    

年代:1979

数据来源: WILEY