preanal


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preanal

(priːˈeɪnəl)
adj
(Anatomy) situated in front of the anus
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Adj.1.preanal - situated in front of the anus
References in periodicals archive ?
There are uncini, rather than acicular spines, in anterior segments and there is a single asetigerous preanal segment, all characteristic of the genus Axiothella.
Ventral profile concave from pectoral-fin to caudal-fin base; preanal area of ventral profile presenting two convexs: one from the tip of snout to the start of pelvic-fin, and the other from end of pelvic-fin to the anal-fin origin.
It is characterized mainly by having a spatulate right spicule with ventral barb at posterior end, the left spicule has notched anterior and razor-sharp distal tips, finely striated caudal region, fifteen pairs (10 preanal, 5 postanal) papillae in males, bifurcate deirids and conical tail tips in both the sexes.
Notes: The body is composed of 20 segments in both sexes; 31 pairs of legs in female and 30 in male; general coloration dorsally brown; collum, head, preanal segment, anal valves, sternal region, and legs yellowish-brown; antennae brown.
These measurements, including body length (BL), preanal length, head length (HL), snout length, length of the pectoral-fin blade, eye diameter, and body depth, are defined in Moser (1996a).
neomexicana from the Conchas Lake area, San Miguel County, New Mexico, reported two preanal scales immediately anterior to the vent in 34 (35.
MEASURE Data (mm) Total length 881 Standard length 705 Preanal length 512 Predorsal length 218 Head length 208 Snout length 84 Eye orbit diameter 40.
15) in head length; origin of anal fin vertically below second last dorsal spine; preanal length 1.
Ventri-anal shield pentagonal, with anterior margin slightly convex and lateral margins slightly concave between JV2-JV4, JV3 absent; 135 long (130-141) and 79 (77-81) wide at level of ZV2 with three pairs of preanal setae and gv2 pore.
01 mm): total length (TL), standard length, head length (HL--distance from the tip of the snout to the operculum margin), predorsal length (to the anterior base of the dorsal fin), preanal length (to the anterior base of the anal fin), trunk length (distance between the operculum and the anterior base of the anal fin), tail length (distance between the anus and the tip of the notochord), caudal peduncle height (distance between the anterior base of the anal fin and the base of the dorsal fin), snout length (from the tip of the snout to the eye), posterior snout width (before the eyes), eye diameter, pectoral fin and pelvic fin lengths (distance between the anterior base and the fin margin), head width (behind the eyes), height at the pectorals, and preanal and postanal regions (Figure 1).
Caudal end with 12 pairs of (sessile) anal papillae, arranged as 7 preanal, 1 adnal and 4 postanal.