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Tuesday, October 18th, 2022
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| 10:47a | [Crustacea • 2022] Siambathynella janineana • A New Species of the Genus Siambathynella (Bathynellacea: Parabathynellidae) from A Thai Cave Abstract Siambathynella janineana sp. nov. (family Parabathynellidae) discovered in Thailand is herein described. The new species displays an exclusive character: a distinctive organ on the antennule of males. It also displays a unique combination of morphological characters, including a seven-segmented antennule and antenna, sexual dimorphism of the antennule, a one-segmented exopod on thoracopod I and a two-segmented one on thoracopods II to VII, a male thoracopod VIII without basipodial setae and with a trapezoidal outer lobe, a female thoracopod VIII with two denticles at the base of two setae, pleopods absent, a sympod of the uropod with an inhomonomous row of spines and an uropod endopod with a spinous distal process and a very large distal spine covered with setules. This is the fifth record of Bathynellacea (family Parabathynellidae) found in caves in Thailand. Keywords: cave, groundwater, Parabathynellidae, Siambathynella, Thailand Order Bathynellacea Chappuis, 1915 Family PARABATHYNELLIDAE Noodt, 1965 Genus Siambathynella Camacho, Watiroyram & Brancelj, 2011 Type species: Siambathynella laorsriae Camacho, Watiroyram & Brancelj, 2011.
Siambathynella janineana sp. nov. Ecology: The material of Siambathynella janineana sp. nov. studied was collected from a pool located in the upper gallery of Tham Chiang Dao Cave. In addition to these specimens, numerous others were sampled by Janine Gibert either by filtering another pool in the upper gallery using a plankton net with an 0.150 mm mesh [about 305 specimens (sp.) were collected with this method] or by using artificial substrates in the same pool (215 sp.) (Gibert 1987). A few specimens were also found in the terminal sump of the tourist gallery (1 sp.), at the outside emergence (1 sp.) and in a Bou-Rouch pump that was positioned about 25 m downstream of the emergence (40 cm depth and 20 l filtered) (1 sp.). The most abundant populations found in the cave were Bathynellacea, with a total of 523 specimens (Gibert 1987). Other taxa collected included mainly ostracods, a few cyclopoid copepods and rarely gastropods and harpacticoid copepods (Gibert 1987). The temperature of the sampled waters varied between 21 °C and 23 °C during July 1985. Etymology: The species name “janineana” (adjective) is dedicated to Prof. Janine Gibert, who passed away in 2009. She was head of the Groundwater Hydrobiology and Ecology Laboratory (UMR CNRS 5023, Laboratoire d’Ecologie des Hydrosystèmes Fluviaux, Hydrobiologie et Ecologie Souterraines) at Université Claude Bernard Lyon 1 in France. She worked in various international programs on subterranean biodiversity and groundwater ecology from the perspective of environmental sustainability, particularly in the project “Protocols for the ASsessment and Conservation of Aquatic Life In the Subsurface (PASCALIS)”. She was also a member of the biospeleological team that led Expedition Thai-Maros in 1985 and was highly active in the sampling of the caves, especially Tham Chiang Dao. Ana I. Camacho and Philippe Leclerc. 2022. A New Species of the Genus Siambathynella Camacho, Watiroyram & Brancelj, 2011 (Crustacea, Bathynellacea, Parabathynellidae) from A Thai Cave. Subterranean Biology. 44: 139-152. DOI: 10.3897/subtbiol.44.93661 | ||||||||||
| 11:10a | [Botany • 2022] Rubus violaceifrons (Rosaceae) • A New Bramble Species from Bohemia (Central Europe, Czech Republic)
Abstract Rubus violaceifrons, a new species from central and north-eastern Bohemia (Czech Republic) is described and illustrated, and its distribution is characterized in detail. We classify it as a member of the series Pallidi of the subgenus Rubus, section Rubus and subsection Hiemales, although its weak specimens partly resemble R. guentheri from ser. Glandulosi. Like all species of R. ser. Pallidi studied so far, R. violaceifrons is tetraploid, as determined using flow cytometry. A detailed morphological comparison of the new bramble species with similar taxa is presented. A determination key including all taxa of the R. ser. Pallidi occurring in the Czech Republic is provided. Key words: apomictic taxa, batology, ploidy level, taxonomy
 Rubus violaceifrons P. Havlíček, Trávn. & Velebil, sp. nov. Ecology:—Rubus violaceifrons most often grows in margins, clearings and openings of coniferous and mixed woodlands and forest plantations, usually in somewhat shaded places. It is clearly a nemophilous bramble species according to the concept of Weber (1995: 296). It is usually found on permeable, moderately humid to slightly dry soils that neutral to slightly acidic. The elevation range of the species spans from 175 m a.s.l. (Káraný and Nový Vestec villages) to 590 m a.s.l (Otradovice village). Distribution:—According to the concept of Weber (1996), Rubus violaceifrons is a “regional” bramble species: the longest diameter of its distribution area is about 150 km (Fig. 4). Currently, it is known from 42 localities dispersed in central and eastern Bohemia in the Czech Republic. The species is possibly an endemic taxon of the country, but it could be found also in southern Poland (particularly in the Kłodzko County or in Silesia). In terms of the grid system of the Atlas Florae Europaeae (for the genus Rubus, see Kurtto et al. 2010), R. violaceifrons is present in the following units: 33UWS4, 33UVR1, 33UVR3, 33UVR4, 33UVQ3, 33UWR1, 33UWR2, 33UWR3, 33UWR4. Etymology:—The epithet “violaceifrons” is a reference to the intense colouration of stem parts and their stalked glands, as well as to the very conspicuous red-violet colour of styles in open flowers. Petr Havlíček, Bohumil Trávníček, Jiri Velebil. 2022. Rubus violaceifrons (Rosaceae), A New Bramble Species from Bohemia (Central Europe, Czech Republic). Phytotaxa. 568(3); 241-254. DOI: 10.11646/phytotaxa.568.3.1 | ||||||||||
| 11:15a | [Botany • 2021] Cyrtorchis okuensis (Orchidaceae: Angraecinae) • Taxonomic Description and Pollination Ecology A New Species Endemic to the Cameroon Volcanic Line
Abstract Background and aims – A recent taxonomic and molecular study of the genus Cyrtorchis revealed three new species. Here, we describe one of these new species, endemic to the Cameroon Volcanic Line (CVL), and compare it to its closest relatives. Its conservation status is provided along with detailed information on its ecology and reproductive biology. Material and methods – A detailed examination of 21 herbarium specimens was performed using standard practices of herbarium taxonomy. The conservation status of the new species was assessed using the IUCN Red List Categories and Criteria. Furthermore, we investigated the reproductive biology of the new species in an easily accessible subpopulation in Cameroon and tested the hypothesis of hawkmoth pollination in the genus Cyrtorchis. Key results – The newly discovered species, here named C. okuensis, is restricted to the montane forest (1600 to 2500 m elevation) of the CVL and is currently assessed as Near Threatened (NT). Among angraecoid orchids in which hawkmoth pollination is recorded (~16 species), C. okuensis has the shortest nectar spur (19–40 mm). In situ observations revealed hawkmoths with short proboscis of the genus Hippotion (H. celerio, H. eson, and H. osiris) as the main pollinators. The rate of pollination and fruiting under natural conditions was low and among the 448 surveyed flowers only 38.8% (174/448 flowers) had their pollinia removed, 19% produced fruits (87/448 flowers), and 16% (70/448 flowers) set mature fruits. Conclusion – Cyrtorchis okuensis is clearly differentiated from C. submontana by its longer and wider floral bracts, longer anther caps, and wider triangular dorsal sepal. Keywords: angraecoid orchids, epiphyte, hawkmoth, IUCN Red List Categories and Criteria, pollination, systematics
Cyrtorchis okuensis Droissart, Azandi & M.Simo, sp. nov. – Cyrtorchis aff. guillaumetii “Oku” (Azandi et al. 2021). Diagnosis – Cyrtorchis okuensisis similar to C. submontana but differs in having wider floral bracts (7–12.5 × 8–13.7 mm vs 4–6.5 × 5–7 mm), longer anther caps (2.5–3 vs 1–2 mm), and wider triangular dorsal sepal (4–5 mm vs 2–3 mm). These species also differ by their habitat; C. submontana is found in submontane and evergreen moist forest (between 550 and 1,200 m), whereas C. okuensis is restricted to the upper montane vegetation (between 1,600 and 2,500 m) along the Cameroon Volcanic Line. Distribution – Endemic to the Cameroon Volcanic Line: Nigeria, Cameroon, and Bioko (Equatorial Guinea) (fig. 3). Habitat and ecology – Restricted to montane vegetation (moist forest, forest-grassland edge, and wooded savannah from 1,600 to 2,500 m), Cyrtorchis okuensis grows on mossy branches of Gnidia glauca (Fresen.) Gilg (Thymelaeaceae), Albizia gummifera (J.F.Gmel.) C.A.Sm. (Fabaceae), and Prunus africana (Hook.f.) Kalkman (Rosaceae). On these phorophytes, C. okuensis is usually found growing with mosses, lichens, ferns, and other orchid species (see details below in “Ecology and reproductive biology”). Etymology – The epithet okuensis refers to Oku, a subdivision in the North-West Region of Cameroon where the large, surveyed subpopulation was discovered around Lake Oku. The term Oku also refers to the people who live in this area and their native language.  Laura N. Azandi, Tariq Stévart, Bonaventure Sonké, Murielle Simo-Droissart, Tania D’haijère and Vincent Droissart. 2021. Taxonomic Description and Pollination Ecology of Cyrtorchis okuensis (Orchidaceae, Angraecinae), A New Species Endemic to the Cameroon Volcanic Line. Plant Ecology and Evolution. 154(3); 483-496. DOI: 10.5091/plecevo.2021.1823   |
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