Figure 18 in A taxonomic review of the vampire catfish genus Paracanthopoma Giltay, 1935 (Siluriformes, Trichomycteridae), with descriptions of nine new species and a revised diagnosis of the genus

Figure 18. Paracanthopoma daemon, holotype, MZUSP 103047, 20.4 mm SL, Brazil, Mato Grosso, Gaúcha do Norte, Rio Coronel Vanick. (A) Lateral view of body; (B) Dorsal view of head; (C) ventral view of head. trunk. Eye large (14.8-17.0% HL), without free orbital rim, by anterior flap of integument. Posterior naris positioned located dorsolaterally on head and directed dorsolateral- anteromesially and adjacent to eye, their middle at trans- ly, covered by thin and transparent integument (Fig. 18). verse line through anterior margin of eye. Posterior inter- Middle of eye slightly anterior to middle of HL, interor- narial width narrower than interorbital. bital width approximately equal to or slightly shorter Opercular odontodophore medium-sized, laterally than longitudinal diameter of eye. Eyelens occupying located on head, on dorsal half of head depth in lateral central portion of lateral surface of eye and constricted view. Opercular odontodes 5, closely positioned as two by iris marginally, with large round pupil in specimens very large ones juxtaposed posteriorly and three smaller examined. Anterior nostril small, located in narrow anterior ones. Main axis of opercular odontodes orient- teardrop-shaped slit on surface of skin and surround- ed horizontally in lateral view, with their distal portion ed by short tubule of integument produced posteriorly curved dorsomedially. One or two caps of replacement into small pointed process, with double elastin cores. odontodes posteriorly to mature ones. Interopercular Anterior internarial width slightly larger than interorbital. odontodophore either similar-sized, or slightly larger Posterior naris larger than anterior one, partly occluded than opercular one, located ventrolaterally on head, immediately ventral to horizontal through origin of pecto- Table 6. Morphometric data of Paracanthopoma daemon. Ranges, mean and ral fin, with 4 or 5 odontodes closely positioned in single SD include holotype. Head subunits were obtained with an ocular micrometer row of four near posterior edge of interopercle, plus sin- and therefore as projections. Abbreviations: min = minimum value; max = gle smaller one anteriorly (when 5). Odontodes of poste- maximum value; n = number of specimens; SD = standard deviation. rior row strongly angled medially. Interopercular odontodophore much closer to opercular one than to eye. One