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A new entocommensal turbellarian (Fam. Pterastericolidae) from the sea star Astropecten irregularis

Abstract

The turbellarian Triloborhynchus astropectinis gen. et sp. nov. lives in the hepatic caeca of the sea star Astropecten irregularis. It belongs to the family Pterastericolidae. It is provided with an opisthaptor and anteriorly with three evaginable pockets. Its body-wall ciliation is reduced.

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Abbreviations

a :

apical organ

b :

brain

bu :

bursa

ca :

common atrium

ci :

ciliation

co :

copulatory bulb

cu :

cuticular organ

di :

divaricator

e :

egg capsule

es :

esophagus

f :

“fingers” of the cuticular apparatus

gl :

glands

gp :

common genital pore

h :

hook of the cuticular apparatus

i :

intestine

m :

mouth

o :

ovary

00 :

ootype

op :

opisthaptor

p :

pharynx

pa :

parenchyma

pr :

prostatic glands

ps :

pseudovagina

sh :

shell glands

st :

cuticular stylet

sv :

seminal vesicle

t :

testicle

u :

uterus

ν:

yolk glands

References

  1. Beklemishev, V.: Sur les turbellariés parasites de la côte Mourmanne. II. Rhabdocoela. Trav. Soc. Imp. Nat. Petrograd 45 (4), 3–79 (1916).

  2. Hyman, L. H.: The invertebrates: Platyhelminthes and Rhynchocoela. The acoelomate Bilateria, 550 p. New York: McGraw-Hill 1951.

  3. Karling, T. G.: On Pterastericola fedotovi (Turbellaria), commensal in sea stars. Z. Morph. Tiere 67, 29–39 (1970).

  4. Ursin, E.: A quantitative investigation of the echinoderm fauna of the central North Sea. Medd Daum. Fisk.-Havunders. 2, 1–204 (1960).

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Additional information

The main part of the material for this investigation was collected and primarily studied in Great Britain by the first mentioned author (here called B). The final work was carried out in Stockholm, at the Swedish Museum of Natural History. Here also new material was prepared from living sea stars delivered from the Biological Station Kristineberg (B and K). Material has also been collected at the Biological Station, Espegrend, Norway (K).

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Bashiruddin, M., Karling, T.G. A new entocommensal turbellarian (Fam. Pterastericolidae) from the sea star Astropecten irregularis . Z. Morph. Tiere 67, 16–28 (1970). https://doi.org/10.1007/BF00280713

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Keywords

  • Developmental Biology
  • Hepatic Caecum