An emendation of the generic diagnosis of Phoreiobothrium Linton, 1889 (Tetraphyllidea: Onchobothriidae) with a detailed description of bothridia and hooks

1985 ◽  
Vol 63 (5) ◽  
pp. 1199-1206 ◽  
Author(s):  
J. N. Caira
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Monophyletic Group ◽  
Generic Diagnosis ◽  
The Third ◽  
Scanning Electron

Hook terminology for the three-pronged hooks of Phoreiobothrium Linton, 1889 is reconciled with that for two-pronged hooks such that the two outermost prongs are considered homologous with the prongs of a two-pronged hook and the third inner prong is termed the basal prong. Scanning electron microscopy was performed on the scolex of Phoreiobothrium lasium Linton, 1889 and the solid nature of the bothridia was reconfirmed. Examination of material of all four species of Phoreiobothrium leads to the conclusion that each species possesses three-pronged hooks that are hollow and open to the outside via pores. The bothridia of each species are considered to be horizontally divided into two loculi, the posterior one being recessed and vertically subdivided. The diagnosis of the genus Phoreiobothrium is emended, and the four species allocated to it are redescribed. Phoreiobothrium is determined to be a monophyletic group on the basis of two synapomorphies and a key to the four species of the genus is presented.

The Mechanism of active capture of animal food by the Sergestid Shrimp Acetes Sibogae Australis

1998 ◽  
Vol 78 (2) ◽  
pp. 497-508 ◽  
Author(s):  
Lachlan Mcleay ◽  
C.G. Alexander
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Prey Capture ◽  
Size Range ◽  
The Third ◽  
Feeding Modes ◽  
In Captivity ◽  
Combined Actions ◽  
Wide Size Range ◽  
Scanning Electron

Combining the use of scanning electron microscopy and microcinematography with functional and behavioural observations has clarified many aspects underlying the feeding processes of the small planktonic sergestid shrimp Acetes sibogae australis. In captivity Acetes sibogae australis is an opportunistic feeder that uses four principal feeding modes to capture a wide size range of prey: Artemia nauplii (<0.33 mm), copepods (<1mm) and moribund Acetes (up to 25 mm). Prey capture is effected by combined actions of the first three pairs of pereiopods and the third maxillipeds before transfer to the more dorsal second maxillipeds. The second maxillipeds are the principal appendages used in securing, manipulating, sorting and rejecting prey before insertion into the vicinity of the inner mouthparts.

Identification of larvae of two Aphodius Helwig, 1798 (Coleoptera: Scarabaeidae: Aphodiinae) species using morphology and DNA barcode

Zootaxa ◽  
2021 ◽  
Vol 5047 (2) ◽  
pp. 153-164
Author(s):  
ANDREY V. FROLOV ◽  
MARIA S. VISHNEVSKAYA ◽  
LILIA A. AKHMETOVA
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Dna Barcode ◽  
The Third ◽  
Coi Sequences ◽  
First Time ◽  
Scanning Electron ◽  
Third Instar Larvae

The third instar larvae of Aphodius (Alocoderus) hydrochaeris (Fabricius, 1798) and A. (Bodilus) ictericus (Laicharting, 1781) are described based on scanning electron microscopy and COI sequences. COI barcode sequence for A. (A.) hydrohaeris is provided for the first time. Two haplotypes are discovered in A. (B.) ictericus.  

First zoeal stage of the snapping shrimps Alpheus formosus Gibbes, 1850 and Alpheus malleator Dana, 1852 (Caridea: Alpheidae), with new characters to the genus

Zootaxa ◽  
2020 ◽  
Vol 4820 (3) ◽  
pp. 540-550 ◽  
Author(s):  
KARMINE PASINATTO ◽  
FERNANDO L. MANTELATTO ◽  
MARIANA TEROSSI
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Zoeal Stage ◽  
Proximal Segment ◽  
Anal Spine ◽  
The Third ◽  
Snapping Shrimps ◽  
First Time ◽  
Scanning Electron

The first zoeae of Alpheus formosus Gibbes, 1850 and Alpheus malleator Dana, 1852 are described and illustrated for the first time, based on laboratory-hatched larvae from parental females sampled in Vitória Island, Ubatuba, Brazil. Both species shared many characters with other species of genus Alpheus Fabricius, 1798, but they also have some exclusive characters as 10 setae on the basis of the maxilla, first maxilliped with endopod 2-segmented and exopod 4-segmented, second maxilliped with exopod 4-segmented, presence of bud only of the first pereopod, presence of anal spine and simple dorsal setae on the pleon. The zoea I of both species, nevertheless, can be separated by segmentation in the exopod of the antenna (8 in A. formosus, 6 in A. malleator); segmentation in the endopod and exopod of the third maxilliped (5 in A. formosus and 4 in A. malleator); peduncle of antennule 3-segmented in A. formosus (unsegmented or 2-segmented in other species) and presence of a medial tubercle in the proximal segment in the exopod of the antenna of A. malleator (absent in A. formosus, not reported in all other species). In this study three new characters are proposed to be analyzed in zoea of the genus Alpheus: presence of anal spine in both species (absent in Alpheus saxidomus Holthuis, 1980, but not reported in other species) and for the first time reported, presence of a tubercle in the exopod of the antenna (present only in A. malleator) and presence of simple dorsal setae on the pleon (both species), here analyzed under light and scanning electron microscopy.

Scanning Electron Microscopy of the Third-Instar Piophila casei (Diptera: Piophilidae), a Fly Species of Forensic Importance

2001 ◽  
Vol 38 (5) ◽  
pp. 756-759 ◽  
Author(s):  
Kabkaew L. Sukontason ◽  
Kom Sukontason ◽  
Somsak Piangjai ◽  
Wej Choochote ◽  
Roy C. Vogtsberger ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
The Third ◽  
Scanning Electron

scholarly journals Abrasive wear in wear plates and hard coatings applied by welding with shielded electrode

2017 ◽  
Vol 26 (46) ◽  
Author(s):  
José Luddey Marulanda-Arévalo ◽  
Luz Adriana Cañas-Mendoza ◽  
Jairo Alberto Barón-Jaimez
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Abrasive Wear ◽  
Linear Growth ◽  
Hard Coatings ◽  
Electric Welding ◽  
The Third ◽  
Hardness Tests ◽  
Scanning Electron

Performance against abrasive wear was evaluated (in compliance with the ASTM G-65 standard) for both wear plates and hard coatings applied by electric welding. The characterization of the coatings was achieved by using hardness tests, optical microscopy and scanning electron microscopy (SEM). Although it was observed a direct correlation between hardness and wear resistance, a linear growth pattern was not followed. Besides the information from the hardness tests, data regarding the distribution and shape of the carbides in the welding bead are also necessary to choose the hard coating applied by welding, to protect against abrasive wear. Base metal and coatings had satisfactory joint, due to their dilution; the first welding layer had less hardness than the third welding layer.

Scanning electron microscopy of the pit of the maxillary palp of selected species of Culicoides

1972 ◽  
Vol 50 (9) ◽  
pp. 1207-1210 ◽  
Author(s):  
Wayne A. Rowley ◽  
Marcia Cornford
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Microscope ◽  
Maxillary Palp ◽  
Large Mammals ◽  
The Third ◽  
Interspecific Differences ◽  
Culicoides Variipennis ◽  
Maxillary Palps ◽  
Scanning Electron

The pits on the third segment of the maxillary palps of Culicoides variipennis, C. obsoletus, C. crepuscularis, C. haematopotus, and C. guttipennis were studied with the scanning electron microscope. The size and shape of the palpal pits and the type and number of sensilla were determined for females of each species and for males of C. variipennis and C. crepuscularis. The bulb-shaped sensilla are remarkably similar in all species, but there are considerable interspecific differences in the size of the pits and in the number of sensilla. The two species that normally feed on large mammals (C. obsoletus and C. variipennis) have significantly fewer sensilla per pit than do species considered ornithophilic. Also, males have fewer sensilla than do females of the same species.

Antennular morphology of the cypris larvae of the mangrove barnacle Fistulobalanus albicostatus (Cirripedia: Thoracica: Balanomorpha)

2007 ◽  
Vol 87 (4) ◽  
pp. 913-915 ◽  
Author(s):  
Benny K.K. Chan ◽  
Priscilla T.Y. Leung
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
The Third ◽  
Fourth Segment ◽  
Intertidal Habitats ◽  
Mangrove Trees ◽  
Caudal Rami ◽  
Scanning Electron

Previous studies on the ultrastructure of barnacle cypris larvae suggest that cypris morphology, especially the antennules which play a key role in selecting the final substratum for settlement, may show variations between species existing in different habitats. In the present study, the cypris morphology of the barnacle Fistulobalanus (Balanus) albicostatus, which predominantly lives on trunks of mangrove trees was investigated using scanning electron microscopy and compared with that of species from other habitats that have already been described. The antennular segments II and III of F. albicostatus each bear one post-axial seta. The third segment consists of an attachment disc surrounded by a thin cuticular velum and the fourth segment exhibits four sub-terminal setae and five terminal setae. The morphology of the cypris antennules of F. albicostatus is similar to other balanomorph barnacles which inhabit hard shores, revealing that the antennular morphology does not have diagnostic variations between species from the different intertidal habitats. The morphology of the caudal rami (used in the evaluation of the substratum microtopography), however, appears to vary among barnacles living on different substrata.

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