摘要:

SUMMARYSound producing apparatus inSisor rhabdophorusis described. The apparatus is formed by the modification of the neural spines of a few of the anterior vertebrae and the first interspinous bone of the dorsal fin. Significance of sound production in this species is discussed.

ISSN:0368-2935    

DOI:10.1111/j.1096-3642.1963.tb01638.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

SUMMARYAlthough the musculature of the ptilinum has been studied extensively, no nervous components have been previously demonstrated. The present paper describes a series of minute hairs, interspersed amongst the ‘spinules’ that cover the organ, each of which is innervated by a bipolar sensory nerve cell. The axon arising from the sensory cell is joined by those from other similar cells, and they pass posteriorly to enter a ganglion; from the ganglion a broad nerve leaves to join the antennal nerve to the brain. The general morphology suggests that the hairs are tactile; this is substantiated by the ‘avoiding reactions’ displayed by the fly when the ptilinum is subjected to tactile stimulation, both when held experimentally, and in nature when by‐passing soil

ISSN:0368-2935    

DOI:10.1111/j.1096-3642.1963.tb01639.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

SUMMARYBerthelinia caribbean. sp. is described from the algaCaulerpa verticillatagrowing in the mangrove swamps near Port Royal, Jamaica. The most important characters which distinguish it from related species are the position of the protoconch at two‐thirds of the shell length; the straight hinge with well developed hinge teeth; the white ligament; yellow shell rays; brown stripes on the head and mantle; the heart shaped pharyngeal bulb with a dorsal pouch; entire, denticulate radular teeth; the concentrated nervous system; and the ampulla divided into two parts. The resemblance toAnomalomya corrugataCossmann is discussed, but it is concluded that, for the present,caribbeashould remain in the genusBerthelinia.It appears to feed entirely onC. verticillatato which it remains attached by a byssus‐like thread even when the valves are closed. When irritated, it secretes a white fluid from the hypobranchial gland, but the deterrent value of this to potential predators is not known.B. caribbeamay be able to survive in brackish water, although the evidence for this is inconclus

ISSN:0368-2935    

DOI:10.1111/j.1096-3642.1963.tb01640.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY

摘要:

SUMMARYOf the 35 species described by Linnaeus underConnsin the 10th edition of theSystema Naturae, 29 are concluded to be valid, four are rejected asnomina dubia, and two are no longer placed inConus.Of the two additional species described in the 12th edition in 1767, one is valid and the other is a synonym of a species described by Linnaeus in 1758.Holotypes of eleven Linnaean species exist. Ten lectotypes, seven illustrations representing lectotypes, and two neotypes have been selected. The types of all 30 valid Linnaean species are indicated in summary form in Table 1 and illustrated photographically in Plates 1–3.None of the five infraspecific taxa proposed by Linnaeus are considered to merit elevation to species rank; it is concluded that all should be relegated to infrasub‐specific status, as they are based not on allopatric populations but on morphological variations without regard to geographic ori

ISSN:0368-2935    

DOI:10.1111/j.1096-3642.1963.tb01641.x

出版商:Blackwell Publishing Ltd    

年代:1963

数据来源: WILEY