Morphological variation and life history in cylindrical forms of Scytosiphon lomentaria (Scytosiphonaceae: Phaeophyta) from southern Australia

1978 ◽  
Vol 47 (4) ◽  
pp. 349-357 ◽  
Author(s):  
M. N. Clayton
Keyword(s):  
Life History ◽  
Morphological Variation ◽  
Scytosiphon Lomentaria

BIOLOGY OF THE ROSE STEM GALLER DIPLOLEPIS NODULOSA (HYMENOPTERA: CYNIPIDAE) AND ITS ASSOCIATED COMPONENT COMMUNITY IN CENTRAL ONTARIO

1997 ◽  
Vol 129 (6) ◽  
pp. 1121-1140 ◽  
Author(s):  
Scott E. Brooks ◽  
Joseph D. Shorthouse
Keyword(s):  
Life History ◽  
Seasonal Variation ◽  
Morphological Variation ◽  
Related Species ◽  
The Other ◽  
Component Community ◽  
The Rose

AbstractDiplolepis nodulosa (Beutenmüller) induces small, monothalamous, prosoplasmic galls in stem tissues of Rosa blanda Aiton. Adults and galls are redescribed and notes on distribution, host records, morphological variation, and a comparison with related species are presented. Galls are commonly attacked by the inquiline Periclistus pirata (Osten Sacken). Data on life history and mortality of inducers and inquilines, along with seasonal variation in gall density, were obtained from a study site near Sudbury. Ontario, in 1993 and 1994. Inquilines killed 55% of the inducer population in 1993 and 65% in 1994. The abundance and density of galls fluctuated over the 2 years; however, the proportion of galls modified by inquilines remained constant. Six species of parasitoids caused an additional 17% inducer mortality. Aprostocetus sp. was the dominant parasitoid of D. nodulosa, whereas the other five species were incidental. The assemblage of parasitoids associated with galls modified by P. pirata caused 13% inquiline mortality and include seven species, of which Eurytoma spp. and Caenacis sp. were dominant. The unique aspects of the D. nodulosa gall system are discussed.

scholarly journals The Bantam Sunfish, Lepomis Symmetricus

1977 ◽  
Vol 31 (1-10) ◽  
pp. 437-466 ◽  
Author(s):  
Brooks M. Burr
Keyword(s):  
Life History ◽  
Species Distribution ◽  
Morphological Variation ◽  
Museum Specimens ◽  
Southern Illinois ◽  
Life History Study

The bantam sunfish, described as Bohlke; Garrett S. Glodek; Tomio Lepomis symmetricus by Stephen A. Forbes in 1883, is one of the least known species in the genus, probably because of its small size, rarity over parts of its range, occurrence in rather inaccessible swamp habitats, and drab and nondescript appearance. This effort to remedy the gaps in our knowledge of the species reviews all published references to L. symmetricus. To supplement the meager information available, this report includes an analysis of morphological variation based on the study of museum specimens, an assessment of the species' distribution, and a life-history study based on periodic collections made at a study site in southern Illinois.

scholarly journals Molecular genetic, life-history and morphological variation in a coastal warm-temperate sciaenid fish: evidence for an upwelling-driven speciation event

2016 ◽  
Vol 43 (9) ◽  
pp. 1820-1831 ◽  
Author(s):  
Romina Henriques ◽  
Warren M. Potts ◽  
Warwick H. Sauer ◽  
Carmen V. Santos ◽  
Jerraleigh Kruger ◽  
...  
Keyword(s):  
Life History ◽  
Morphological Variation ◽  
Molecular Genetic ◽  
Speciation Event ◽  
Warm Temperate ◽  
Sciaenid Fish

Section 2 Summary—Functional Morphology and Ecology of Larval Forms

2018 ◽  
Keyword(s):  
Life History ◽  
Functional Morphology ◽  
Morphological Variation ◽  
Aquatic Environment ◽  
Molecular Variation ◽  
Form And Function ◽  
Life History Stages ◽  
Taxonomic Groups ◽  
And Function ◽  
Exogenous Nutrients

Larvae are intermediate life history stages between embryos and juvenile and/or reproductive stages, but this characteristic is about the only feature that unites the incredible diversity of larval forms. The majority of larval forms evolved in the sea and exhibit tremendous morphological, physiological, and molecular variation, many of which are potential adaptations to match form and function in the context of the aquatic environment. The three chapters in this section review how larvae from different taxonomic groups sort through and ingest exogenous nutrients and how environmental variation elicits morphological variation....

MORPHOLOGY AND LIFE HISTORY OF SCYTOSIPHON LOMENTARIA (SCYTOSIPHONACEAE, PHAEOPHYCEAE) FROM THE AZORES1

2003 ◽  
Vol 39 (2) ◽  
pp. 353-359 ◽  
Author(s):  
Manuela Isabel Parente ◽  
Ana Isabel Neto ◽  
Robert Lawson Fletcher
Keyword(s):  
Life History ◽  
Scytosiphon Lomentaria ◽  
History Of

On the pea crabs found in the chiton Tonicia chilensis (Frembly, 1827) (Mollusca, Polyplacophora: Chitonidae) identified as “Orthotheres sp.” by Melzer & Schwabe (2008), and its reassignment to Calyptraeotheres Campos, 1990 (Crustacea: Pinnotheridae)

Zootaxa ◽  
2018 ◽  
Vol 4434 (2) ◽  
pp. 385
Author(s):  
ERNESTO CAMPOS
Keyword(s):  
Life History ◽  
Sexual Dimorphism ◽  
Morphological Variation ◽  
Type Species ◽  
West Pacific ◽  
Larval Stages ◽  
The Third ◽  
The Family ◽  
Total Fusion ◽  
Pacific Species

Crabs of the family Pinnotheridae have been considered a phylogenetically heterogeneous group and taxonomically problematic (Palacios-Theil 2009, 2016; Tsang et al. 2018). The lack of knowledge of sexual dimorphism and morphological variation throughout the life history for many species have complicated its taxonomy and has resulted in errors in its classification (Campos 1989, 1993, 2016). Consequently, if the taxonomy of these symbiotic crabs had been based on juveniles and undeveloped character states, the problems get even more serious (Campos 1989, 1993). Melzer & Schwabe (2008) studied three juvenile crabs living in the chiton Tonicia chilensis (Frembly, 1827) (Polyplacophora: Chitonidae) collected in Muelle Dichato, Chile, and they identified them as the putative invasive stage of a species of Orthotheres Sakai, 1969. The crabs are of the typical juvenile pinnotherid form with a masculine habitus, including a suborbicular carapace, large eyes and a slender pleon (= abdomen) with the telson well defined (Ocampo et al. 2017). Unpublished observations on juveniles and adults of several species of pinnotherid crabs by the author, for example, Juxtafabia muliniarum (Rathbun, 1918), Dissodactylus lockingtoni Glassell, 1935, D. xantusi Glassell, 1936, Calyptraeotheres granti (Glassell, 1933), Austinotheres angelicus (Lockington, 1877) and Tumidotheres margarita (Smith, 1870) have revealed that the third maxilliped exhibit little morphological variation through the post-larval stages of development (from juvenile to adult). This appendage, including the partial or total fusion of the ischium and merus (Fig. 1A–G; Fig 2A, C–G), has been considered a valuable feature for distinguishing genera in the family Pinnotheridae (Bürger 1895; Rathbun 1918; Manning 1993; Ahyong & Ng 2007; Campos 2009). According to Melzer & Schwabe (2008) the ischium and merus of the third maxilliped are completely fused, the carpus is larger than the propodus and the small dactylus is subterminally inserted on the propodus (Fig 1C), and as such the juveniles studied are possibly members of the genus Orthotheres Sakai, 1969. A detailed re-examination of the third maxilliped, chela of pereiopod 1 (cheliped) and pleon, however, has shown otherwise. Campos (1989) discussed the taxonomy of Orthotheres and treated all the species he recognised as belonging to this genus; characterising its members by its diagnostic third maxilliped palp structure. Ng & Ho (2014) rediagnosed the genus based on the type species, O. turboe Sakai, 1969, from Japan, and restricted it for three Indo-West Pacific species; commenting that the American species as well as some Indo-West Pacific taxa will need to referred to other genera when a full revision is done. This revision is now in progress by the author, PKL Ng and ST Ahyong. Until the revision is complete, the genus is treated here in the broader sense of Campos (1989) and Geiger & Martin (1999). 

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