| 词条 | Paedoclione doliiformis |
| 释义 |
| name = Paedoclione doliiformis | image = Paedoclione doliiformis.png | image_caption = Drawing of ventral view of live Paedoclione doliiformis. | regnum = Animalia | phylum = Mollusca | classis = Gastropoda | unranked_superfamilia = clade Heterobranchia clade Euthyneura clade Euopisthobranchia clade Gymnosomata | superfamilia = Clionoidea | familia = Clionidae | genus = Paedoclione | genus_authority = Danforth, 1907[1] | species = P. doliiformis | binomial = Paedoclione doliiformis | binomial_authority = Danforth, 1907[1] }} Paedoclione doliiformis is a species of sea angel, a small floating sea slug, a pelagic marine gastropod mollusk in the family Clionidae. Paedoclione doliiformis is the only species in the genus Paedoclione.[2]The generic name is a reference to the paedomorphic habit of this genus, which retains many larval features throughout its life.[3] Paedoclione doliiformis was originally described by Charles Haskell Danforth in 1907.[1] It was not collected by zoologists for the next 61 years.[6] It was rediscovered in 1968 by Lalli (1972).[4]DistributionThe type locality of Paedoclione doliiformis is Casco Bay, Portland, Maine.[1] The distribution includes St. Margarets Bay, Nova Scotia, the Gulf of Maine[3][4] and possibly elsewhere. DescriptionPaedoclione doliiformis retains juvenile (larval) physical characteristics for the whole of its life.[4] This is called neoteny (a kind of pedomorphosis).[4]The body length is up to 1.5 mm.[2] Paedoclione doliiformis has no shell.[2] It is a gelatinous, mostly transparent pteropod, and it only has a shell in its embryonic stage.{{Citation needed|date=February 2011}} The orange visceral sac is confined to the anterior part. Life cycleMating is carried out ventrally for mutual fertilization. The following spring, this results in a free-floating, gelatinous egg mass. Eggs hatch after three days, and the shell is retained until the 11th day.[3] Feeding habitsPaedoclione doliiformis feeds exclusively on Limacina helicina and on Limacina retroversa, but solely on juveniles with shells smaller than 1 mm.[5] Its abundance is closely linked to that of its prey.[3]References1. ^1 2 3 Danforth C. H. (1907) "A new pteropod from New England". Proceedings of the Boston Society of Natural History 34: 1-19, figs A-B, pls 1-4. (with introduction by J. S. Kingsley) [https://archive.org/stream/proceedingsofbos34bostuoft#page/2/mode/2up page 2]. {{Taxonbar|from=Q3142296}}2. ^1 2 "Genus Paedoclione". Marine Species Identification Portal, accessed 4 February 2011. 3. ^1 2 3 Lalli C. M. & Conover R. J. (1973). "Reproduction and development of Paedoclione doliiformis, and a comparison with Clione limacina (Opisthobranchia: Gymnosomata)". Marine Biology 19(1): 13-22. {{doi|10.1007/BF00355415}}. 4. ^1 2 3 4 Lalli C. M. (1972). "Food and feeding in Paedoclione doliiformis Danforth, a neotenous gymnosomatous pteropod". Biological Bulletin 143(2): [https://archive.org/stream/biologicalbullet143mari#page/392/mode/2up 392]-402, 4 figs. abstract and PDF. 5. ^Lalli C. M. & Gilmer R. W. (1989). Pelagic Snails. The biology of holoplanktonic gastropod molluscs. Stanford University Press: Stanford, California. [https://books.google.com/books?id=yIAfwz5cxPMC&lpg=PP1&dq=Pelagic%20Snails%3A%20The%20Biology%20of%20Holoplanktonic%20Gastropod%20Molluscs&hl=cs&pg=PA185#v=onepage&q=Clione%20limacina&f=false page 185], [https://books.google.com/books?id=yIAfwz5cxPMC&lpg=PP1&dq=Pelagic%20Snails%3A%20The%20Biology%20of%20Holoplanktonic%20Gastropod%20Molluscs&hl=cs&pg=PA188#v=onepage&q=Clione%20limacina&f=false 188]. 2 : Clionidae|Gastropods described in 1907 |
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