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A Description of the Vexillifer Larvae of Pyramodon ventralis and Snyderidia canina (Pisces, Carapidae) with Comments on Classification
|Title:||A Description of the Vexillifer Larvae of Pyramodon ventralis and Snyderidia canina (Pisces, Carapidae) with Comments on Classification|
|Authors:||Markle, Douglas F.|
Olney, John E.
|Issue Date:||Apr 1980|
|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.
|Appears in Collections:||Pacific Science Volume 34, Number 2, 1980|
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