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Title: A Description of the Vexillifer Larvae of Pyramodon ventralis and Snyderidia canina (Pisces, Carapidae) with Comments on Classification 
Author: Markle, Douglas F.; Olney, John E.
Date: 1980-04
Publisher: University of Hawaii Press
Citation: Markle DF, Olney JE. 1980. A description of the vexillifer larvae of Pyramodon ventralis and Snyderidia canina (Pisces, Carapidae) with comments on classification. Pac Sci 34(2): 173-180.
Abstract: The first identified vexillifers (4.4, 6.0 mm HL) and 2 juveniles
(10.5, 11.4 mm HL) of Pyramodon ventralis are described and compared with
vexillifer larvae of Snyderidia canina (3.6,5.7 mm HL). The presence of pelvic
fins, a visceral cradle, and a greater number of pectoral-fin rays distinguishes
larvae of P. ventralis from larvae of S. canina. Pyramodontine vexillifers are
characterized as follows: a deep, compressed head and trunk with a depth at
the first anal ray of 0.77-0.92 HL; a short predorsal distance of 1.12-1.27 HL;
more than 24 pectoral-fin rays; a proximal vexillum radial with a descending
anterior process, a wavy ventral contour, and a posterior process passing under
the anterior dorsal-fin radials; a pronounced second neural spine; and long
anal-fin radials. Identification of a vexillifer larva of Pyramodon establishes the
vexillifer larva as a unique specialization of all Carapidae and reinforces the
classification of Pyramodon as a close relative of Snyderidia.
ISSN: 0030-8870

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