摘要:

Boophis periegetes, sp. nov., is described from Ranomafana National Park, eastern Madagascar. The new frog is a large species having, in breeding males, extremely spinose dorsal integument and enlarged glands along the canthal ridges, upper eyelids, and anterior dorsolateral portion of the body (females smooth and without glands). The large glands are unique within the genus as currently known. Nuptial pads ofB. periegetesinvolve the prepollex, fingers I and II, and the anteroventral portion of the forearm. The new species also differs from other species ofBoophisby combined features of large size; brownish dorsal colouration with a dark brown facial mask; large digital discs; and extensive webbing. Notes on a sample ofBoophis albilabris(Boulenger) are given, including an amended description, and observations on natural history, secondary sexual characteristics, and behaviour.Boophis albilabrisexhibits a highly unusual sexual dimorphism in the position of the cloacal opening, and shares withB. periegetesthe unusual character of nuptial pad development on the forearm.

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1995.tb01427.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

The environmental factors affecting the distribution, variation, and development and taxonomy ofHelix (Jacosta) siphnicaKobelt, 1883, an endemic landsnail of Siphnos Island (Cyclades, Greece), are examined.Two types of populations can be distinguished due to different strategies of shell development. In the first, and more frequent, type, the keeled and depressed juvenile shells, become rounded in the later developmental stages. In the second type, in all developmental stages, only keeled shells are found. In this study changes in the allometric relationships of shell height, shell diameter and whorls are correlated with the development of the genital system and changes in habitat selection. The keeled forms are found in drier and more stony environments. The degradation of the forests to dry maquis and frygana and desertification in the Aegean insular ecosystems are probably connected with the development of keeled forms. Keeled populations ofTrochoidea siphnicaare regarded as an example of neoteny leading to paedomorphosis by retardation.

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1995.tb01428.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Rhinobranchipus martensigen. et sp. nov. (Anostraca: Branchipodidae) was collected from a shallow temporary pool in the surroundings of Grahamstown (Cape Province, South Africa) (33o18'S, 26o32'E).Rhinobranchipusshares partial fusion of the chitinized basal parts of the male antennae, the so‐called clypeus, with other Branchipodidae. The new genus is distinguished from confamilial genera by the morphology of the basal part of the penes. The new species, known from its type locality only, should be considered endangered, if it has not already become extinct as a result of recent modifications of its habita

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1995.tb01429.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY

摘要:

Since 1870, it has been generally accepted that two very similar species of the amphidiscophoran genusPheronemaLeidy inhabit the NE Atiantic.Pheronema carpenteri(Thomson, 1869) was first described as the indicative organism of the‘Hotieniaground’ NW of Scotland at 970 m.Pheronema grayi(Kent, 1870) was described from the coast of Portugal from similar depth. The species were differentiated mainly by body form and distribution of conspicuous external spiculation. Occurrences of the two species reported since then document their broadly overlapping horizontal and vertical distributions at bathyal depths throughout the NE Atlantic and E Mediterranean. Conspicuously, not one of 16 collections containing either species included both species. Review of literature descriptions and inspection of key specimens show that no characters provide unambiguous differentiation of the two forms. Based upon this evidence, and discovery of correspondence in which Kent privately negated the validity of his species, it is concluded that only one species population ofPheronemaoccurs in this region.Pheronema grayiis thus a junior synonym ofP. carpent

ISSN:0024-4082    

DOI:10.1111/j.1096-3642.1995.tb01430.x

出版商:Blackwell Publishing Ltd    

年代:1995

数据来源: WILEY