TY - JOUR

T1 - Variability of ooeciostome shape and position in antarctic idmidroniform bryozoans (bryozoa

T2 - Cyclostomatida)

AU - Ostrovsky, Andrew N.

PY - 1998/12

Y1 - 1998/12

N2 - Variability in the shape and position of the ooeciostome in Antarctic idmidroniform cyclostome bryozoans is described in detail. All characters analysed (size and shape of ooeciostome and ooeciopore, ooeciostome position, orientation of ooeciopore) exhibit variability. Therefore, they may be categorized as useful rather than diagnostic taxonomic characters. Recent idmidroniform bryozoans are arranged in a morphoseries reflecting some possible stages in the evolution of the ooeciostome. Possible trends include loss of terminal position, length decrease, increased curvature and flattening. The ooeciostome of Idmidronea fraudulenta Ostrovsky & Taylor, 1996 is studied by SEM for the first time.

AB - Variability in the shape and position of the ooeciostome in Antarctic idmidroniform cyclostome bryozoans is described in detail. All characters analysed (size and shape of ooeciostome and ooeciopore, ooeciostome position, orientation of ooeciopore) exhibit variability. Therefore, they may be categorized as useful rather than diagnostic taxonomic characters. Recent idmidroniform bryozoans are arranged in a morphoseries reflecting some possible stages in the evolution of the ooeciostome. Possible trends include loss of terminal position, length decrease, increased curvature and flattening. The ooeciostome of Idmidronea fraudulenta Ostrovsky & Taylor, 1996 is studied by SEM for the first time.

KW - Evolution

KW - Exidmonea

KW - Gonozooid

KW - Idmidronea

KW - Taxonomy

KW - Variability

UR - http://www.scopus.com/inward/record.url?scp=0002569945&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0002569945

VL - 237

SP - 97

EP - 106

JO - Zoologischer Anzeiger

JF - Zoologischer Anzeiger

SN - 0044-5231

IS - 2-3

ER -