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Start Over Coverage 75-79 Subject morphology

1. A redescription and a new geographical record in the Black Sea of Bacciger israelensis Fischthal, 1980 (Trematoda: Fellodistomidae)

Creator:
Dimitrov, G.I. and Bray, R.A.
Format:
print
Type:
model:internalpart and TEXT
Subject:
Bacciger israelensis, Boops boops, Black Sea, morphology, and new geographical record
Language:
English
Description:
Bacciger israelensis Fischthal, 1980 (Trematoda: Fellodistomidae) was recorded from Boops boops (Perciformes: Sparidae) in Bulgarian Black Sea coastal waters for the first time. Re-examination of the morphology of B. israelensis showed some new details: Laurer’s canal opens dorsally a short distance anterior to the excretory pore; seminal receptacle situated posterior to ventral sucker and ventral to ovary; ovary composed of three nearly spherical but not separated lobes forming apexes of isosceles triangle; tegumental spines covering body including entire surface of ventral sucker and distal half of upper part of oral sucker.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

2. Nymphal sexual dimorphism in the sheep tick Ixodes ricinus (Acari: Ixodidae)

Creator:
Dusbábek, František
Format:
print
Type:
model:internalpart and TEXT
Subject:
Ixodes ricinus, sheep tick, nymphs, sexual dimorphism, morphology, and development
Language:
English
Description:
Unfed nymphs of Ixodes ricinus (L.) can be divided into two morphological groups according to the length of idioso-ma, scutum, hypostome and palpal segment III, and the number of dorsal alloscutal setae. Specimens of greater body dimensions and more numerous dorsal alloscutal setae moulted predominantly into females. The frequency of different nymphal length categories in field-collected ticks followed a normal distribution. The length of unfed nymphs correlates well with the length (r = 0.7248 ± 0.0711, P < 0.001) and weight (r = 0.6519 ± 0.0782, P < 0.001) of engorged nymphs, however, it varies in ticks of different origin. In field-collected ticks, freshly engorged female nymphs were 2.30-2.94 mm long, male nymphs 2.14-2.46 mm long. Feeding period (P < 0.05) and premoulting period (P < 0,001 ) were significantly longer in female nymphs both in field-collected and laboratory-derived I. ricinus. The engorgement weight was found to be the best criterion for differentiation of male and female nymphs of ixodid ticks. In field-collected nymphs engorged on BALB/c mice, 98.6 % of females moulted from nymphs weighting more than 3.60 mg, while in laboratory-derived ticks, 98.4 % of females emerged from nymphs of 3.42 mg body mass or more.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public