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Aphanocalyx singidaensis

Taxonomy
Aphanocalyx singidaensis was named by Herendeen and Jacobs (2000). Its type locality is Mahenge, which is in a Lutetian crater lake mudstone/shale in Tanzania.

Synonymy list
YearName and author
2000Aphanocalyx singidaensis Herendeen and Jacobs

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RankNameAuthor
genusAphanocalyx
RankNameAuthor
speciessingidaensis

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Diagnosis
ReferenceDiagnosis
P. S. Herendeen and B. F. Jacobs 2000Leaf bifoliolate, petiole 20 mm long, 1.5 mm wide, basal pulvinus well developed, ~3.5 mm long, 2 mm wide, with prominent transverse wrinkles or striations. Distal pulvinus well developed, 4 mm long, 2.5 mm wide. No rachis extension beyond attachment of terminal leaflets. Leaflets incompletely preserved, sessile, lacking well-differentiated petiolule, markedly asymmetrical, at least 6.0 cm long (all three specimens lacking apex), maximum width 19-28 mm near the center of the leaflet. Leaflet base asymmetrical, acute to obtuse, apex apparently acute but whether entire or emarginate is unknown. Leaflet pulvinus well developed. Leaflet venation consists of a single eccentric primary vein, with the leaflet lamina on the proximal (outer) side of the primary vein much wider (15-23 mm) than the lamina on the distal (inner) side of the primary vein (2-4 mm). Inner lamina widest near the center of the leaflet, tapering toward the base and apex. Venation of the inner and outer lamina dissimilar. Inner lamina venation composed of approximately ten eucamptodromous secondary veins, generally with 1-2 intersecondaries between secondary veins. Tertiary veins weakly percurred and sinuous to reticulate proximally, strongly percurrent, straight distally. Quaternary and quinternary veins more or less orthogonal reticulate. Areole venation not preserved. Outer lamina venation essentially basal acrodromous with 4-5 veins arising from the leaflet pulvinus. Basal acrodromous veins form convergent arches toward the leaflet apex. The vein closest (adjacent) to the primary vein is the widest of the basal acrodromous veins and extends for most of the length of the leaflet. The outermost vein is the weakest of the acrodromous veins, and it is distinguishable for lee than one-fifth of the length of the leaflet before it anastomoses with the finer venation. Four to six eucamptodromous secondary veins arise from the primary vein; tertiary and higher order venation is essentially random reticulate. Cuticle not preserved.