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Trilobita - Corynexochida - Illaenidae

Synonymy list
YearName and author
2014Caudillaenus Rabano et al.

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EubilateriaAx 1987
phylumArthropodaLatreille 1829
classTrilobitaWalch 1771
orderCorynexochidaKobayashi 1935
familyIllaenidaeHawle and Corda 1847

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.

I. Rabano et al. 2014Cephalon parabolic in outline, with modera tely large eyes situated about 1.5 times their own length from posterior margin; glabella wide, about half the width of cephalon posteriorly, axial furrows subparallel to slightly curved inwards in vicinity of the lunette (ca opposite posterior end of the palpebral lobes), genal angles rounded. Librigenae with weak subocular furrow. Rostral plate broad (tr.), weakly convex (sag.), posterolaterally defined by almost transverse connective sutures and with a short upwardly and forwardly turned flange on the posterior edge. Hypostome with a narrow and globose middle body. Thorax of ten segments with well-defined axis that is broader than pleurae in dorsal view; axial furrows subparallel; pleurae adaxial to fulcrum successively increasing in width (tr.) posteriorly. Pygidium subtriangular in outline, larger than cephalon; axis weakly defined, subconical; pleural region concave posteromedially. Pygidial doublure broad, divided into convex outer half and flattened or weakly concave inner half by a shallow vincular furrow running approximately parallel to the inner margin. Dorsal surface of carapace almost smooth, with sculpture of fine terrace lines and small pits only developed on the anteriormost part of cephalon and the lateral borders of pygidium.