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pectinirhomb
pectinirhomb n.
Brit. 
/pɛkˈtɪnᵻrɒm(b)/
, /pɛkˈtɪnᵻrɒm(b)/U.S. /pɛkˈtɪnəˌrɑm(b)/
Palaeontology (in certain rhombiferan echinoderms) a complex type of pore rhomb with comb-like parallel slits and a raised external rim; cf. earlier pectinated rhomb n. at pectinated adj. Compounds./pɛkˈtɪnəˌrɑm(b)/ΚΠ
1899 F. A. Bather in Rep. Brit. Assoc. Advancem. Sci. 1898 917 The need for compensating this restriction of the assumed respiratory area led to the specialisation of the remaining pore-rhombs as ‘pectini-rhombs’.
1961 J. Stubblefield Davies's Introd. Palaeontol. (ed. 3) viii. 196 Lepadocrinus..shows a remarkable specialization of a few (usually three) of the rhombs into large pectinirhombs with all the appearance of respiratory organs (gills).
1994 Jrnl. Paleontol. 68 324 Cuniculocystis floweri..appears to be a typical rhombiferan in most of its morphologic features except that it lacks pectinirhombs.
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as lemmas