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The architecture of the physid musculature of Physa acuta Draparnaud, 1805 (Gastropoda: Physidae)
No full textNaranjo-García, E., Appleton, C. C. (2009): The architecture of the physid musculature of Physa acuta Draparnaud, 1805 (Gastropoda: Physidae). African Invertebrates 50 (1): 1, DOI: 10.5733/afin.050.0101, URL: http://www.bioone.org/doi/abs/10.5733/afin.050.010
Fig. 3 in Re-examination of Physa mosambiquensis Clessin, 1886 and its relationship with other Aplexinae (Pulmonata: Physidae) reported from Africa
No full textFig. 3. ESEM micrograph of the spire of a syntype shell of P. mosambiquensis showing the sutural belt indicated by an arrow. Scale bar = 500 µm.Published as part of Appleton, C. C. & Dana, P., 2005, Re-examination of Physa mosambiquensis Clessin, 1886 and its relationship with other Aplexinae (Pulmonata: Physidae) reported from Africa, pp. 71-83 in African Invertebrates 46 on page 75, DOI: 10.5281/zenodo.766480
Fig. 8 in Two Asian freshwater snails newly introduced into South Africa and an analysis of alien species reported to date
No full textFig. 8. Shell of Biomphalaria glabrata collected in Durban in the 1980s (photos: C. Appleton).Published as part of Appleton, C. C. & Miranda, N. A. F., 2015, Two Asian freshwater snails newly introduced into South Africa and an analysis of alien species reported to date, pp. 1 in African Invertebrates 56 (1) on page 13, DOI: 10.5733/afin.056.0102, http://zenodo.org/record/764996
Fig. 4 in The architecture of the physid musculature of Physa acuta Draparnaud, 1805 (Gastropoda: Physidae)
No full textFig. 4. (A) Lateral view of P. acuta showing the columellar muscle (Cm) and its relationship with the female and male pores. Also shown are Cm branches running towards the head and side, the insertion of Cm into the foot and the posterior part of the Cm that attaches to the shell. (B) Lateral view of P. acuta showing the relationship between the Pm (dotted line), the Cm, fan muscle (Pf) and the pneumostome–mantle band" of fibres (Pp) on the roof of the mantle. (C) Dorsal view of P. acuta (visceral hump removed) showing the relationship between the branches Pm2–Pm5 of the physid muscle s.s. associated with the 'cervical septum' (dotted lines) and the columellar muscle (Cm).Published as part of Naranjo-García, E. & Appleton, C. C., 2009, The architecture of the physid musculature of Physa acuta Draparnaud, 1805 (Gastropoda: Physidae), pp. 1 in African Invertebrates 50 (1) on page 7, DOI: 10.5733/afin.050.0101, http://zenodo.org/record/764949
Two Asian Freshwater Snails Newly Introduced into South Africa and an Analysis of Alien Species Reported to Date
No full textAppleton, C. C., Miranda, N. A. F. (2015): Two Asian freshwater snails newly introduced into South Africa and an analysis of alien species reported to date. African Invertebrates 56 (1): 1, DOI: 10.5733/afin.056.0102, URL: http://www.bioone.org/doi/10.5733/afin.056.010
Gyraulus Charpentier 1837
No full textKey to species of Gyraulus in South Africa One of the two indigenous species of Gyraulus in South Africa, G. connollyi is endemic to the central and southern parts of the country while the other, G. costulatus , is widespread across Africa (Brown 1994). Gyraulus chinensis may be separated from these two indigenous species by means of the following key: 1 Shell distinctly ribbed, shoulder with an angular carina............ costulatus (Krauss) – Shell not distinctly ribbed, shoulder rounded.........................................................2 2 Pigmentation of head, tentacles and mantle roof of pale spots and blotches, flatness index of whorl consistently below 3.0, prostate gland with 12 or more lobes of uniform length and arrangement, preputium usually longer than penis sheath......................................................................................... connollyi Brown & Van Eeden – Pigmentation of head, tentacles and mantle roof of conspicuous dark spots and blotches, flatness index of whorl between 1.9 and 4.0, prostate gland with fewer than 12 lobes, lobes of variable length and arrangement, preputium usually shorter than penis sheath....................................................................... chinensis (Dunker)Published as part of Appleton, C. C. & Miranda, N. A. F., 2015, Two Asian freshwater snails newly introduced into South Africa and an analysis of alien species reported to date, pp. 1 in African Invertebrates 56 (1) on pages 7-8, DOI: 10.5733/afin.056.0102, http://zenodo.org/record/764996
Lymnaeidae Rafinesque 1815
No full textKey to the Lymnaeidae in South Africa Four lymnaeid species occur in South Africa; L. natalensis, Galba truncatula (O.F. Müller, 1774) and the invasive Pseudosuccinea columella (Say, 1817) and R. rubiginosa. They may be separated using the following key: 1 Shell ovate, basal whorl markedly swollen, spire usually much lower than the aperture....................................................................................................................3 – Shell slender, basal whorl not markedly swollen, spire usually not more than half the apertural height..................................................................................................2 2 Shell with reticulate sculpture, spire up to half as high as aperture....................................................................................................... Pseudosuccinea columella (Say) – Shell without reticulate sculpture, spire about as high as aperture.......................................................................................................... Galba truncatula (O.F. Müller) 3 Mantle uniformly pigmented except for numerous small discrete spots, partially pigmented with small unpigmented spots and larger blotches, shell not robust, outer margin of basal whorl curved, aperture wide.............. Lymnaea natalensis Krauss – Mantle partially pigmented with small unpigmented spots and larger blotches, shell robust, outer margin of basal whorl nearly straight so that aperture is relatively narrow....................................................................... Radix rubiginosa (Michelin)Published as part of Appleton, C. C. & Miranda, N. A. F., 2015, Two Asian freshwater snails newly introduced into South Africa and an analysis of alien species reported to date, pp. 1 in African Invertebrates 56 (1) on page 6, DOI: 10.5733/afin.056.0102, http://zenodo.org/record/764996
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Fig. 2 in The architecture of the physid musculature of Physa acuta Draparnaud, 1805 (Gastropoda: Physidae)
No full textFig. 2. (A) Dorsal view of P. acuta showing the muscles overlying the lung floor, viz. thin bands of fibres (Plu) from the main trunk of the physid muscle s.s. (Pm) and from the columellar muscle (Cm). The anterior corner of the pneumostome is indicated in the lower mid-portion of the visceral hump but is not drawn. (B) Lateral view of P. acuta showing the pneumostome–mantle band of muscle fibres (Pp). This band runs from the left anterior part of the mantle roof (i.e. the anterior corner of the pneumostome) towards the right hand side of the roof, anchoring on the fan muscle (see also Fig. 2C). (C) Floor of the mantle cavity after removal of the lung tissue, showing in its mid-portion the pneumostome–mantle band of muscle fibres (Pp) that seems to give support to the opening of the pneumostome. The uppermost of these fibres converge at the edge of the mantle collar and immediately below are those (removed) that support the kidney.Published as part of Naranjo-García, E. & Appleton, C. C., 2009, The architecture of the physid musculature of Physa acuta Draparnaud, 1805 (Gastropoda: Physidae), pp. 1 in African Invertebrates 50 (1) on page 5, DOI: 10.5733/afin.050.0101, http://zenodo.org/record/764949
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