Myosepta: Sheaths of connective tissue separating myomeres
. Transmits contracting forces of muscle fibers between myomeres
Pigmentation patterns, counts of myomeres
, head spines, and fin rays, and various measurements were recorded.
Taxonomic questions: Trunk myomere
counts have been used to distinguish species of lampreys (Table 1).
In other species, the neuromasts on the trunk continue to proliferate until they reach one per myomere
; this is attained at 13-15 mm in Engraulis mordax (O'Connell, 1981).
Whenever possible, the number of myomeres
, spines, and rays of dorsal, anal, caudal, pectoral, and pelvic fins were recorded.
had a beige coloration going from the posterior cephalic region to the beginning of the tail.
A single row of PVMs is present starting at three myomeres
posterior to the anus.
The majority of larvae had higher myomere
counts (37-42) than Icelus (35-36) and a different pelvic-fin count (1, 3) than I.
Generally there is one PVM per myomere
but in many individuals one or more are missing from the row.
and fin-ray counts and morphometric measurements were made on the left side of the body.
(3) Postdorsal and preanal myomere
counts in larvae 10-15 mm SL (Ditty et al., 1994)
pauciradiatus can be identified by using myomere
counts (56-58 vs.