Get 20M+ Full-Text Papers For Less Than $1.50/day. Start a 14-Day Trial for You or Your Team.

Learn More →

Pratylenchus hippeastri n. sp. (Nematoda: Pratylenchidae) from amaryllis in Florida with notes on P. scribneri and P. hexincisus

Pratylenchus hippeastri n. sp. (Nematoda: Pratylenchidae) from amaryllis in Florida with notes on... AbstractA new root-lesion nematode Pratylenchus hippeastri n. sp. is described fromamaryllis (Hippeastrum spp.) in Florida. The new species is characterised bya combination of the following morphological features of females: slenderbody, flat, plain and smooth face, head with two lip annuli, an incompletethird annulus, and with second lip annulus thicker than first, ellipsoidalstylet knobs, rectangular empty spermatheca with large round cavity, andconoid tail with bluntly pointed terminus usually showing a ventralconstriction, or subhemispherical and smooth. The ranges of morphometriccharacters of P. hippeastri n. sp. overlap with those of P. scribneri and P.hexincisus. These three species also share some morphological and biologicalfeatures such as two lip annuli, an empty spermatheca and similar lateralfields, but differ in the morphology of head patterns (smooth face in P.hippeastri n. sp. vs divided face in the others) and tail termini(hemispherical and subhemispherical in P. scribneri and subdigitate in P.hexincisus vs bluntly pointed in P. hippeastri n. sp.). A referencepopulation of P. scribneri from Ohio and one of P. hexincisus from Tennesseewere obtained during the course of unsuccessful attempts to recover P.scribneri at the type locale in Tennessee. The D3 rDNA sequences of thereference populations matched GenBank sequences for these two species. Smallmorphological differences between the P. scribneri population from Ohio andthe P. scribneri lectotype occurred in the shape of stylet knobs(ellipsoidal vs round) and spermatheca (round with a central cavity vsoblong) and also in the length of the pharyngeal overlap (longer in thereference population). These morphological differences cast doubt about theidentity of the lectotype, which may be P. hexincisus. New morphologicaldetails were obtained for P. hexincisus from Tennessee, which included adivided face, an almost rectangular empty spermatheca with a central cavityand subdigitate tail termini. Based on our phylogenetic inferences from DNAsequences P. hippeastri n. sp. is more closely related to P. zeae and aFlorida population of P. loosi than to P. scribneri or P. hexincisus. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Nematology Brill

Pratylenchus hippeastri n. sp. (Nematoda: Pratylenchidae) from amaryllis in Florida with notes on P. scribneri and P. hexincisus

Download PDF
18 pages

Loading next page...
 
/lp/brill/pratylenchus-hippeastri-n-sp-nematoda-pratylenchidae-from-amaryllis-in-bFhC1sVAv1

References (28)

Publisher
Brill
Copyright
Copyright © Koninklijke Brill NV, Leiden, The Netherlands
ISSN
1388-5545
eISSN
1568-5411
DOI
10.1163/156854107779969754
Publisher site
See Article on Publisher Site

Abstract

AbstractA new root-lesion nematode Pratylenchus hippeastri n. sp. is described fromamaryllis (Hippeastrum spp.) in Florida. The new species is characterised bya combination of the following morphological features of females: slenderbody, flat, plain and smooth face, head with two lip annuli, an incompletethird annulus, and with second lip annulus thicker than first, ellipsoidalstylet knobs, rectangular empty spermatheca with large round cavity, andconoid tail with bluntly pointed terminus usually showing a ventralconstriction, or subhemispherical and smooth. The ranges of morphometriccharacters of P. hippeastri n. sp. overlap with those of P. scribneri and P.hexincisus. These three species also share some morphological and biologicalfeatures such as two lip annuli, an empty spermatheca and similar lateralfields, but differ in the morphology of head patterns (smooth face in P.hippeastri n. sp. vs divided face in the others) and tail termini(hemispherical and subhemispherical in P. scribneri and subdigitate in P.hexincisus vs bluntly pointed in P. hippeastri n. sp.). A referencepopulation of P. scribneri from Ohio and one of P. hexincisus from Tennesseewere obtained during the course of unsuccessful attempts to recover P.scribneri at the type locale in Tennessee. The D3 rDNA sequences of thereference populations matched GenBank sequences for these two species. Smallmorphological differences between the P. scribneri population from Ohio andthe P. scribneri lectotype occurred in the shape of stylet knobs(ellipsoidal vs round) and spermatheca (round with a central cavity vsoblong) and also in the length of the pharyngeal overlap (longer in thereference population). These morphological differences cast doubt about theidentity of the lectotype, which may be P. hexincisus. New morphologicaldetails were obtained for P. hexincisus from Tennessee, which included adivided face, an almost rectangular empty spermatheca with a central cavityand subdigitate tail termini. Based on our phylogenetic inferences from DNAsequences P. hippeastri n. sp. is more closely related to P. zeae and aFlorida population of P. loosi than to P. scribneri or P. hexincisus.

Journal

Nematology – Brill

Published: Jan 1, 2007

Keywords: MORPHOLOGY; ITS-RDNA; PHYLOGENY; MOLECULAR; D2/D3; DESCRIPTION; ROOT-LESION NEMATODES; HIPPEASTRUM SPP; MORPHOMETRICS

There are no references for this article.