Parathyasira sp (Northern hatchet shell):  

Predictions & Data for this entry

Model:  abj  

MRE = 0.066
SMSE = 0.116

Zero-variate data
am2190 2186 (0.001652)dlife spanDufo2017
Lb0.0138 0.01377 (0.002015)cmtotal length at birthGiolDufo2015
Lp0.28 0.2797 (0.001087)cmtotal length at pubertyDufo2017
Li0.514 0.4884 (0.04982)cmultimate total lengthDufo2017
Wdi0.002783 0.00291 (0.04555)gultimate ash-free dry weightMari2017
Ri6.137 6.104 (0.005334)#/dmaximum reprod rateguessed
Uni-variate data
DatasetFigure(RE)Independent variableDependent variableReference
LWd see Fig. 1 (0.3376)total lengthash-free dry weightMari2017
tL see Fig. 2 (0.08705)time since birthaverage lengthDufo2017
Pseudo-data at Tref
DataGeneralised animalParathyasira spUnitDescription
v 0.02 0.02027cm/denergy conductance
kap 0.8 0.9575-allocation fraction to soma
kap_R 0.95 0.95-reproduction efficiency
p_M 18 23.61J/^3vol-spec som maint
k_J 0.002 0.0021/dmaturity maint rate coefficient
kap_G 0.8 0.8019-growth efficiency


  • Thyasirids may have sulfur-oxidizing bacterial symbionts. Symbiotic thyasirids are mixotrophs, deriving nutritional input from particulate feeding and from their symbionts. (ref: DandSpir1993)
  • Parathyasira sp. is sympatric with Thyasira cf. gouldi (including symbiotic OTUs). These thyasirids are found in close proximity and with a patchy distribution. (ref: BatsLaur2014)
  • Parathyasira sp. may be constrained to lower latitudes when compared to Thyasira gouldi, which is described as being panarctic. The distribution of Parathyasira sp. and Thyasira cf. gouldi (outside of Bonne Bay, Newfoundland) remains uncertain. (ref: Dufo2017)


  • A minimal amount of information on Thyasira gouldi is used in this entry when there is no corresponding data for Parathyasira sp.
  • Growth measurements were updated in January 2018.


  • [Wiki] Accessed : 2017-11-21.
  • [Dufo2017] Observations by Suzanne Dufour.
  • [Mari2017] Observations by Joany Marino.
  • [guessed] Guessed based on Thyasira gouldi by Blac1973.
  • [BatsLaur2014] R. T. Batstone, J. R. Laurich, F. Salvo, and S. C. Dufour. Divergent chemosymbiosis-related characters in Thyasira cf. gouldi (Bivalvia: Thyasiridae). PLoS ONE, 9(3):1--9, 2014.
  • [Blac1973] W. M. Blacknell. Aspects of the biology of Thyasira gouldi (Philippi) and its copepod parasite Axinophilus thyasirae (Bresciani and Ockelmann). PhD thesis, University of Stirling, 1973.
  • [DandSpir1993] P. R. Dando and B. Spiro. Varying nutritional dependence of the thyasirid bivalves Thyasira sarsi and T. equalis on chemoautotrophic symbiotic bacteria, demonstrated by isotope ratios of tissue carbon and shell carbonate. Marine Ecology Progress Series, pages 151--158, 1993.
  • [GiolDufo2015] M. Giolland and S. C. Dufour. Identification de bivalves de la famille des thyasirids formant un complexe despeces cryptiques dans un fjord de Terre-Neuve (Canada). Unpublished, 2015.
  • [Kooy2010] S.A.L.M. Kooijman. Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge, 2010.
  • [LaurBats2015] J. R. Laurich, R. T. Batstone, and S. C. Dufour. Temporal variation in chemoautotrophic symbiont abundance in the thyasirid bivalve Thyasira cf. gouldi. Marine Biology, 162(10):2017--2028, 2015.

Bibtex files with references for this entry

Joany Marino, 2017/11/22 (last modified by Joany Marino 2018/01/20)

accepted: 2018/01/30

refer to this entry as: AmP Parathyasira sp version 2018/01/30