Gonad pouches in a new clam-like monoplacophoran from the Silurian of Sweden

Linsley, Robert; Peel, John S.

doi:10.1111/j.1502-3931.1983.tb01155.x

Cited by 4 publications

(6 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…BEYRICHIDISCUS. -This small bellerophontiform mollusc is known from a single species, B. fecundatus Linsley & Peel, recovered from the Silurian Burgsvik Sandstone of Gotland (Linsley & Peel 1983). Like Praematuratropis, Beyrichidiscus has a prominent keel and lateral swellings (called cruminae by Linsley & Peel) which create a well-developed furrow adjacent to the umbilici.…”

Section: Mode Of Life Of Pruemuturutropis and Beyrichidiscusmentioning

confidence: 99%

“…Linsley & Peel made no mention of any extensive inductural deposits in Beyrichidiscus, but as only faint growth lines were noted and as preservation did not permit determination of shell structure we cannot rule out such an inductural covering. Linsley & Peel (1983) stated that the sediment associated with Beyrichidiscus was a bioclastic calcarenite. We presume, as did they, that this would probably be a readily penetrable medium for an infaunal mollusc.…”

Section: Mode Of Life Of Pruemuturutropis and Beyrichidiscusmentioning

confidence: 99%

See 1 more Smart Citation

Infaunal or semi‐infaunal bellerophont gastropods: analysis of Euphemites and functionally related taxa

Harper

Rollins

1985

LET

View full text Add to dashboard Cite

198501 15: Infaunal or semi-infaunal bellerophont gastropods:LETHAIA analysis of euphemites and functionally related taxa. Lethaia, Vol. 18, Oslo. ISSN 0024- 1164.Burrowing and plowing gastropods may have existed prior to the Mesozoic, contrary to the conservative tendency of categorizing Paleozoic archaeogastropods as herbivorous hardground dwellers. We propose that Euphemites and other bellerophontiform molluscs such as Praematuratroph and Beyrichidiscus make functional and paleoecological sense only if reconstructed with an internal shell adapted to an infaunal mode of life. Attributes diagnostic of a probable infaunal mode of life in fossil bellerophontiform molluscs include: (1) lack of apertural flare; (2) restricted aperture; (3) low rate of whorl expansion; (4) semi-radial aperture; (5) extensive secondary shell deposits; (6) absence of extensive collabral ornament; (7) dorsolateral or umbilical furrows; (8) color patterns indicative of mantle extension and retraction capabilities; (9) absence of shell breakage and repair; and (10) associated lithologies indicative of penetrable substrates such as mudstones. Niche diversity in the bellerophontacean molluscs was probably much greater than previously suspected. This is entirely consistent with their long geologic range. Most bellerophontaceans, particularly the Late Paleozoic forms, were probably either 'nestling' or semiinfaunal with the apertural margins enwrapped by mantle or mantle and foot. As such they may have been particularly susceptible to predation during the postulated Mesozoic increase in number of infaunal predatorsa factor which may have been contributory to the bellerophontacean demise. 0 Morphological analysis, Euphemites, Bellerophontacea, infaunal gastropods, Late Paleozoic.

show abstract

Section: Mode Of Life Of Pruemuturutropis and Beyrichidiscusmentioning

confidence: 99%

Section: Mode Of Life Of Pruemuturutropis and Beyrichidiscusmentioning

confidence: 99%

Infaunal or semi‐infaunal bellerophont gastropods: analysis of Euphemites and functionally related taxa

Harper

Rollins

1985

LET

View full text Add to dashboard Cite

show abstract

“…1E). In Beyrichidiscus fecundatus Linsley & Peel, 1983 a pronounced anterior gape accomplishes the same purpose.…”

Section: General Morphology Of Bellerophontiform Molluscsmentioning

confidence: 87%

Predation on bellerophontiform molluscs in the Palaeozoic

Ebbestad

Lindström

Peel

2009

LET

Self Cite

View full text Add to dashboard Cite

Shell repair assumed to result from failed predation is documented in 66 specimens of Ordovician-Carboniferous bellerophontiform tergomyan and gastropod molluscs to examine the relationship between the distribution and appearance of injuries, shell morphology and the internal anatomy of the molluscs, as well as the attack strategies of the presumed predators. Furthermore, the distribution of repaired injuries from failed attacks along the apertural margin as a reflection of the nature of the margin and emarginations is investigated. Bellerophontiform molluscs are ideal for this study because of their distinctive isostrophic morphology and the possibility to directly compare broad and narrow conchs with either deep or shallow medial emarginations. The results show that taxa with a deep medial emargination in the form of a slit have significantly more medial injuries than lateral ones. Near-equal frequencies of lateral and medial injuries in specimens with a shallow emargination (slit or sinus) suggest random distribution. Shell form (narrow or broad) does not exert overall control on the distribution of injuries except, perhaps, in some broad explanate shells with an insignificant medial emargination. While this suggests that it is the type of medial emargination that governs distribution of injuries in these forms, it is not clear if this is a result of passive selection due to structural geometry or preferential targeting by predators (i.e. site-specific mode of attack). Predation strategies on bellerophontiform molluscs thus seem to be dependent on the morphological features of the shells rather than their interpretation as tergomyan or gastropod. h Gastropods, molluscs, Palaeozoic, predation, tergomyans. Jan Ove R. Ebbestad [jan-ove.ebbestad@evolmuseum.uu.se], Anna Lindström [anna. lindstrom@nrm.se] and John S. Peel [john.peel@pal.uu.se],

show abstract

“…A number of relevant studie exist, e.g., Horny (1970) and Peel (1977a) discu sed inhalant emarginations in fossil lergomya while ), Peel (1980a. Linsley & Peel (1983) and Peel & Yochelson (1987) discussed more strongly coiled species. Linsley & Kier (1984) ba ed their proposal of the molluscan Class Paragastropoda on functional morphologieal analysis while used this approach as the basis for formalising the separation of the two clas es Tergomya and Helcionelloida.…”

Section: Monoplacophora: Current Usagementioning

confidence: 99%

“…Similarly, Horny (in press, a) describes umbilical sinuses in Sinuitopsis strongly indicative of tergomyan affinities. Functional morphological analysis of the type employed by Linsley ( , 1978, Linsley & Peel (1983; see also Peel, 1974) and others offers a potential solution.…”

Section: Gastropods or Retractile Tergomyansmentioning

confidence: 99%